/* $NetBSD: machdep.c,v 1.284 1998/02/06 07:21:55 mrg Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* Charles M. Hannum. All rights reserved.
* Copyright (c) 1992 Terrence R. Lambert.
* Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)machdep.c 7.4 (Berkeley) 6/3/91
*/
#include "opt_cputype.h"
#include "opt_vm86.h"
#include "opt_user_ldt.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/map.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/exec.h>
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/msgbuf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/extent.h>
#include <sys/syscallargs.h>
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVSHM
#include <sys/shm.h>
#endif
#ifdef KGDB
#include <sys/kgdb.h>
#endif
#include <dev/cons.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#if defined(UVM)
#include <uvm/uvm_extern.h>
#endif
#include <sys/sysctl.h>
#define _I386_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/gdt.h>
#include <machine/pio.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <machine/specialreg.h>
#include <machine/bootinfo.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/ic/i8042reg.h>
#include <dev/ic/mc146818reg.h>
#include <i386/isa/isa_machdep.h>
#include <i386/isa/nvram.h>
#ifdef DDB
#include <machine/db_machdep.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#endif
#ifdef VM86
#include <machine/vm86.h>
#endif
#include "apm.h"
#include "bioscall.h"
#if NBIOSCALL > 0
#include <machine/bioscall.h>
#endif
#if NAPM > 0
#include <machine/apmvar.h>
#endif
#include "isa.h"
#include "isadma.h"
#include "npx.h"
#if NNPX > 0
extern struct proc *npxproc;
#endif
#include "pc.h"
#if (NPC > 0)
#include <machine/pccons.h>
#endif
#include "vt.h"
#if (NVT > 0)
#include <i386/isa/pcvt/pcvt_cons.h>
#endif
#include "com.h"
#if (NCOM > 0)
#include <sys/termios.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#endif
/* the following is used externally (sysctl_hw) */
char machine[] = "i386"; /* cpu "architecture" */
char machine_arch[] = "i386"; /* machine == machine_arch */
char bootinfo[BOOTINFO_MAXSIZE];
/*
* Declare these as initialized data so we can patch them.
*/
int nswbuf = 0;
#ifdef NBUF
int nbuf = NBUF;
#else
int nbuf = 0;
#endif
#ifdef BUFPAGES
int bufpages = BUFPAGES;
#else
int bufpages = 0;
#endif
int physmem;
int dumpmem_low;
int dumpmem_high;
int boothowto;
int cpu_class;
vm_offset_t msgbuf_vaddr, msgbuf_paddr;
vm_offset_t idt_vaddr, idt_paddr;
#ifdef I586_CPU
vm_offset_t pentium_idt_vaddr;
#endif
#if defined(UVM)
vm_map_t exec_map = NULL;
vm_map_t mb_map = NULL;
vm_map_t phys_map = NULL;
#else
vm_map_t buffer_map;
#endif
extern int biosbasemem, biosextmem;
extern vm_offset_t avail_start, avail_end;
extern vm_offset_t hole_start, hole_end;
#if !defined(MACHINE_NEW_NONCONTIG)
static vm_offset_t avail_next;
#endif
/*
* Extent maps to manage I/O and ISA memory hole space. Allocate
* storage for 8 regions in each, initially. Later, ioport_malloc_safe
* will indicate that it's safe to use malloc() to dynamically allocate
* region descriptors.
*
* N.B. At least two regions are _always_ allocated from the iomem
* extent map; (0 -> ISA hole) and (end of ISA hole -> end of RAM).
*
* The extent maps are not static! Machine-dependent ISA and EISA
* routines need access to them for bus address space allocation.
*/
static long ioport_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)];
static long iomem_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)];
struct extent *ioport_ex;
struct extent *iomem_ex;
static ioport_malloc_safe;
caddr_t allocsys __P((caddr_t));
void dumpsys __P((void));
void identifycpu __P((void));
void init386 __P((vm_offset_t));
#ifndef CONSDEVNAME
#define CONSDEVNAME "pc"
#endif
#if (NCOM > 0)
#ifndef CONADDR
#define CONADDR 0x3f8
#endif
#ifndef CONSPEED
#define CONSPEED TTYDEF_SPEED
#endif
#ifndef CONMODE
#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#endif
int comcnmode = CONMODE;
#endif /* NCOM */
struct btinfo_console default_consinfo = {
{0, 0},
CONSDEVNAME,
#if (NCOM > 0)
CONADDR, CONSPEED
#else
0, 0
#endif
};
void consinit __P((void));
#ifdef KGDB
#ifndef KGDB_DEVNAME
#define KGDB_DEVNAME "com"
#endif
char kgdb_devname[] = KGDB_DEVNAME;
#if (NCOM > 0)
#ifndef KGDBADDR
#define KGDBADDR 0x3f8
#endif
int comkgdbaddr = KGDBADDR;
#ifndef KGDBRATE
#define KGDBRATE TTYDEF_SPEED
#endif
int comkgdbrate = KGDBRATE;
#ifndef KGDBMODE
#define KGDBMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#endif
int comkgdbmode = KGDBMODE;
#endif /* NCOM */
void kgdb_port_init __P((void));
#endif /* KGDB */
#ifdef COMPAT_NOMID
static int exec_nomid __P((struct proc *, struct exec_package *));
#endif
int i386_mem_add_mapping __P((bus_addr_t, bus_size_t,
int, bus_space_handle_t *));
int _bus_dmamap_load_buffer __P((bus_dmamap_t, void *, bus_size_t,
struct proc *, int, vm_offset_t *, int *, int));
void cyrix6x86_cpu_setup __P((void));
static __inline u_char
cyrix_read_reg(u_char reg)
{
outb(0x22, reg);
return inb(0x23);
}
static __inline void
cyrix_write_reg(u_char reg, u_char data)
{
outb(0x22, reg);
outb(0x23, data);
}
/*
* Machine-dependent startup code
*/
void
cpu_startup()
{
unsigned i;
caddr_t v;
int sz;
int base, residual;
vm_offset_t minaddr, maxaddr;
vm_size_t size;
struct pcb *pcb;
int x;
#if NBIOSCALL > 0
extern int biostramp_image_size;
extern u_char biostramp_image[];
#endif
/*
* Initialize error message buffer (et end of core).
*/
#if defined(UVM) && defined(PMAP_NEW)
msgbuf_vaddr = uvm_km_valloc(kernel_map, i386_round_page(MSGBUFSIZE));
if (msgbuf_vaddr == NULL)
panic("failed to valloc msgbuf_vaddr");
#endif
/* msgbuf_paddr was init'd in pmap */
#if defined(PMAP_NEW)
for (x = 0; x < btoc(MSGBUFSIZE); x++)
pmap_kenter_pa((vm_offset_t)msgbuf_vaddr + x * NBPG,
msgbuf_paddr + x * NBPG, VM_PROT_ALL);
#else
for (x = 0; x < btoc(MSGBUFSIZE); x++)
pmap_enter(pmap_kernel(), (vm_offset_t)msgbuf_vaddr + x * NBPG,
msgbuf_paddr + x * NBPG, VM_PROT_ALL, TRUE);
#endif
initmsgbuf((caddr_t)msgbuf_vaddr, round_page(MSGBUFSIZE));
printf(version);
identifycpu();
printf("real mem = %d\n", ctob(physmem));
/*
* Find out how much space we need, allocate it,
* and then give everything true virtual addresses.
*/
sz = (int)allocsys((caddr_t)0);
#if defined(UVM)
if ((v = (caddr_t)uvm_km_zalloc(kernel_map, round_page(sz))) == 0)
panic("startup: no room for tables");
#else
if ((v = (caddr_t)kmem_alloc(kernel_map, round_page(sz))) == 0)
panic("startup: no room for tables");
#endif
if (allocsys(v) - v != sz)
panic("startup: table size inconsistency");
/*
* Allocate virtual address space for the buffers. The area
* is not managed by the VM system.
*/
size = MAXBSIZE * nbuf;
#if defined(UVM)
if (uvm_map(kernel_map, (vm_offset_t *) &buffers, round_page(size),
NULL, UVM_UNKNOWN_OFFSET,
UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
UVM_ADV_NORMAL, 0)) != KERN_SUCCESS)
panic("cpu_startup: cannot allocate VM for buffers");
minaddr = (vm_offset_t)buffers;
#else
buffer_map = kmem_suballoc(kernel_map, (vm_offset_t *)&buffers,
&maxaddr, size, TRUE);
minaddr = (vm_offset_t)buffers;
if (vm_map_find(buffer_map, vm_object_allocate(size), (vm_offset_t)0,
&minaddr, size, FALSE) != KERN_SUCCESS)
panic("startup: cannot allocate buffers");
#endif
if ((bufpages / nbuf) >= btoc(MAXBSIZE)) {
/* don't want to alloc more physical mem than needed */
bufpages = btoc(MAXBSIZE) * nbuf;
}
/*
* XXX We defer allocation of physical pages for buffers until
* XXX after autoconfiguration has run. We must do this because
* XXX on system with large amounts of memory or with large
* XXX user-configured buffer caches, the buffer cache will eat
* XXX up all of the lower 16M of RAM. This prevents ISA DMA
* XXX maps from allocating bounce pages.
*
* XXX Note that nothing can use buffer cache buffers until after
* XXX autoconfiguration completes!!
*
* XXX This is a hack, and needs to be replaced with a better
* XXX solution! --thorpej@netbsd.org, December 6, 1997
*/
/*
* Allocate a submap for exec arguments. This map effectively
* limits the number of processes exec'ing at any time.
*/
#if defined(UVM)
exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
16*NCARGS, TRUE, NULL);
#else
exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
16*NCARGS, TRUE);
#endif
/*
* Allocate a submap for physio
*/
#if defined(UVM)
phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
VM_PHYS_SIZE, TRUE, NULL);
#else
phys_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
VM_PHYS_SIZE, TRUE);
#endif
/*
* Finally, allocate mbuf cluster submap.
*/
#if defined(UVM)
mb_map = uvm_km_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr,
VM_MBUF_SIZE, FALSE, NULL);
#else
mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr,
VM_MBUF_SIZE, FALSE);
#endif
/*
* Initialize callouts
*/
callfree = callout;
for (i = 1; i < ncallout; i++)
callout[i-1].c_next = &callout[i];
/*
* XXX Buffer cache pages haven't yet been allocated, so
* XXX we need to account for those pages when printing
* XXX the amount of free memory.
*/
#if defined(UVM)
printf("avail mem = %ld\n", ptoa(uvmexp.free - bufpages));
#else
printf("avail mem = %ld\n", ptoa(cnt.v_free_count - bufpages));
#endif
printf("using %d buffers containing %d bytes of memory\n",
nbuf, bufpages * CLBYTES);
#if NBIOSCALL > 0
/*
* this should be caught at kernel build time, but put it here
* in case someone tries to fake it out...
*/
#ifdef DIAGNOSTIC
if (biostramp_image_size > NBPG)
panic("biostramp_image_size too big: %x vs. %x\n",
biostramp_image_size, NBPG);
#endif
#if defined(PMAP_NEW)
pmap_kenter_pa((vm_offset_t)BIOSTRAMP_BASE, /* virtual */
(vm_offset_t)BIOSTRAMP_BASE, /* physical */
VM_PROT_ALL); /* protection */
#else
pmap_enter(pmap_kernel(),
(vm_offset_t)BIOSTRAMP_BASE, /* virtual */
(vm_offset_t)BIOSTRAMP_BASE, /* physical */
VM_PROT_ALL, /* protection */
TRUE); /* wired down */
#endif
bcopy(biostramp_image, (caddr_t)BIOSTRAMP_BASE, biostramp_image_size);
#ifdef DEBUG
printf("biostramp installed @ %x\n", BIOSTRAMP_BASE);
#endif
#endif
/*
* Configure the system.
*/
ioport_malloc_safe = 1;
configure();
/*
* XXX Allocate physical pages for buffers; see above.
*/
base = bufpages / nbuf;
residual = bufpages % nbuf;
for (i = 0; i < nbuf; i++) {
#if defined(UVM)
vm_size_t curbufsize;
vm_offset_t curbuf;
struct vm_page *pg;
/*
* Each buffer has MAXBSIZE bytes of VM space allocated. Of
* that MAXBSIZE space, we allocate and map (base+1) pages
* for the first "residual" buffers, and then we allocate
* "base" pages for the rest.
*/
curbuf = (vm_offset_t) buffers + (i * MAXBSIZE);
curbufsize = CLBYTES * ((i < residual) ? (base+1) : base);
while (curbufsize) {
pg = uvm_pagealloc(NULL, 0, NULL);
if (pg == NULL)
panic("cpu_startup: not enough memory for "
"buffer cache");
#if defined(PMAP_NEW)
pmap_kenter_pgs(curbuf, &pg, 1);
#else
pmap_enter(kernel_map->pmap, curbuf,
VM_PAGE_TO_PHYS(pg), VM_PROT_ALL, TRUE);
#endif
curbuf += PAGE_SIZE;
curbufsize -= PAGE_SIZE;
}
#else
vm_size_t curbufsize;
vm_offset_t curbuf;
/*
* First <residual> buffers get (base+1) physical pages
* allocated for them. The rest get (base) physical pages.
*
* The rest of each buffer occupies virtual space,
* but has no physical memory allocated for it.
*/
curbuf = (vm_offset_t)buffers + i * MAXBSIZE;
curbufsize = CLBYTES * (i < residual ? base+1 : base);
vm_map_pageable(buffer_map, curbuf, curbuf+curbufsize, FALSE);
vm_map_simplify(buffer_map, curbuf);
#endif
}
/*
* Set up buffers, so they can be used to read disk labels.
*/
bufinit();
/*
* Set up proc0's TSS and LDT.
*/
gdt_init();
curpcb = pcb = &proc0.p_addr->u_pcb;
pcb->pcb_flags = 0;
pcb->pcb_tss.tss_ioopt =
((caddr_t)pcb->pcb_iomap - (caddr_t)&pcb->pcb_tss) << 16;
for (x = 0; x < sizeof(pcb->pcb_iomap) / 4; x++)
pcb->pcb_iomap[x] = 0xffffffff;
pcb->pcb_ldt_sel = GSEL(GLDT_SEL, SEL_KPL);
pcb->pcb_cr0 = rcr0();
pcb->pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
pcb->pcb_tss.tss_esp0 = (int)proc0.p_addr + USPACE - 16;
tss_alloc(pcb);
ltr(pcb->pcb_tss_sel);
lldt(pcb->pcb_ldt_sel);
proc0.p_md.md_regs = (struct trapframe *)pcb->pcb_tss.tss_esp0 - 1;
}
/*
* Allocate space for system data structures. We are given
* a starting virtual address and we return a final virtual
* address; along the way we set each data structure pointer.
*
* We call allocsys() with 0 to find out how much space we want,
* allocate that much and fill it with zeroes, and then call
* allocsys() again with the correct base virtual address.
*/
caddr_t
allocsys(v)
register caddr_t v;
{
#define valloc(name, type, num) \
v = (caddr_t)(((name) = (type *)v) + (num))
#ifdef REAL_CLISTS
valloc(cfree, struct cblock, nclist);
#endif
valloc(callout, struct callout, ncallout);
#ifdef SYSVSHM
valloc(shmsegs, struct shmid_ds, shminfo.shmmni);
#endif
#ifdef SYSVSEM
valloc(sema, struct semid_ds, seminfo.semmni);
valloc(sem, struct sem, seminfo.semmns);
/* This is pretty disgusting! */
valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int));
#endif
#ifdef SYSVMSG
valloc(msgpool, char, msginfo.msgmax);
valloc(msgmaps, struct msgmap, msginfo.msgseg);
valloc(msghdrs, struct msg, msginfo.msgtql);
valloc(msqids, struct msqid_ds, msginfo.msgmni);
#endif
/*
* Determine how many buffers to allocate. We use 10% of the
* first 2MB of memory, and 5% of the rest, with a minimum of 16
* buffers. We allocate 1/2 as many swap buffer headers as file
* i/o buffers.
*/
if (bufpages == 0)
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (btoc(2 * 1024 * 1024) + physmem) /
(20 * CLSIZE);
if (nbuf == 0) {
nbuf = bufpages;
if (nbuf < 16)
nbuf = 16;
}
/*
* XXX stopgap measure to prevent wasting too much KVM on
* the sparsely filled buffer cache.
*/
if (nbuf * MAXBSIZE > VM_MAX_KERNEL_BUF)
nbuf = VM_MAX_KERNEL_BUF / MAXBSIZE;
if (nswbuf == 0) {
nswbuf = (nbuf / 2) &~ 1; /* force even */
if (nswbuf > 256)
nswbuf = 256; /* sanity */
}
#if !defined(UVM)
valloc(swbuf, struct buf, nswbuf);
#endif
valloc(buf, struct buf, nbuf);
return v;
}
/*
* Info for CTL_HW
*/
char cpu_model[120];
extern char version[];
/*
* Note: these are just the ones that may not have a cpuid instruction.
* We deal with the rest in a different way.
*/
struct cpu_nocpuid_nameclass i386_nocpuid_cpus[] = {
{ CPUVENDOR_INTEL, "Intel", "386SX", CPUCLASS_386,
NULL}, /* CPU_386SX */
{ CPUVENDOR_INTEL, "Intel", "386DX", CPUCLASS_386,
NULL}, /* CPU_386 */
{ CPUVENDOR_INTEL, "Intel", "486SX", CPUCLASS_486,
NULL}, /* CPU_486SX */
{ CPUVENDOR_INTEL, "Intel", "486DX", CPUCLASS_486,
NULL}, /* CPU_486 */
{ CPUVENDOR_CYRIX, "Cyrix", "486DLC", CPUCLASS_486,
NULL}, /* CPU_486DLC */
{ CPUVENDOR_CYRIX, "Cyrix", "6x86", CPUCLASS_486,
cyrix6x86_cpu_setup}, /* CPU_6x86 */
{ CPUVENDOR_NEXGEN,"NexGen","586", CPUCLASS_386,
NULL}, /* CPU_NX586 */
};
const char *classnames[] = {
"386",
"486",
"586",
"686"
};
const char *modifiers[] = {
"",
"OverDrive ",
"Dual ",
""
};
struct cpu_cpuid_nameclass i386_cpuid_cpus[] = {
{
"GenuineIntel",
CPUVENDOR_INTEL,
"Intel",
/* Family 4 */
{ {
CPUCLASS_486,
{
"486DX", "486DX", "486SX", "486DX2", "486SL",
"486SX2", 0, "486DX2 W/B Enhanced",
"486DX4", 0, 0, 0, 0, 0, 0, 0,
"486" /* Default */
},
NULL
},
/* Family 5 */
{
CPUCLASS_586,
{
0, "Pentium", "Pentium (P54C)",
"Pentium (P24T)", "Pentium/MMX", "Pentium", 0,
"Pentium (P54C)", 0, 0, 0, 0, 0, 0, 0, 0,
"Pentium" /* Default */
},
NULL
},
/* Family 6 */
{
CPUCLASS_686,
{
0, "Pentium Pro", 0, "Pentium II",
"Pentium Pro", 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
"Pentium Pro" /* Default */
},
NULL
} }
},
{
"AuthenticAMD",
CPUVENDOR_AMD,
"AMD",
/* Family 4 */
{ {
CPUCLASS_486,
{
0, 0, 0, "Am486DX2 W/T",
0, 0, 0, "Am486DX2 W/B",
"Am486DX4 W/T or Am5x86 W/T 150",
"Am486DX4 W/B or Am5x86 W/B 150", 0, 0,
0, 0, "Am5x86 W/T 133/160",
"Am5x86 W/B 133/160",
"Am486 or Am5x86" /* Default */
},
NULL
},
/* Family 5 */
{
CPUCLASS_586,
{
"K5", "K5", "K5", "K5", 0, 0, "K6",
0, 0, 0, 0, 0, 0, 0, 0, 0,
"K5 or K6" /* Default */
},
NULL
},
/* Family 6, not yet available from AMD */
{
CPUCLASS_686,
{
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
"Pentium Pro compatible" /* Default */
},
NULL
} }
},
{
"CyrixInstead",
CPUVENDOR_CYRIX,
"Cyrix",
/* Family 4 */
{ {
CPUCLASS_486,
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
"486" /* Default */
},
NULL
},
/* Family 5 */
{
CPUCLASS_586,
{
0, 0, "6x86", 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
"6x86" /* Default */
},
cyrix6x86_cpu_setup
},
/* Family 6 */
{
CPUCLASS_686,
{
"6x86MX", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
"6x86MX" /* Default */
},
NULL
} }
}
};
#define CPUDEBUG
void
cyrix6x86_cpu_setup()
{
/* set up various cyrix registers */
/* Enable suspend on halt */
cyrix_write_reg(0xc2, cyrix_read_reg(0xc2) | 0x08);
/* enable access to ccr4/ccr5 */
cyrix_write_reg(0xC3, cyrix_read_reg(0xC3) | 0x10);
/* cyrix's workaround for the "coma bug" */
cyrix_write_reg(0x31, cyrix_read_reg(0x31) | 0xf8);
cyrix_write_reg(0x32, cyrix_read_reg(0x32) | 0x7f);
cyrix_write_reg(0x33, cyrix_read_reg(0x33) & ~0xff);
cyrix_write_reg(0x3c, cyrix_read_reg(0x3c) | 0x87);
/* disable access to ccr4/ccr5 */
cyrix_write_reg(0xC3, cyrix_read_reg(0xC3) & ~0x10);
}
void
identifycpu()
{
extern char cpu_vendor[];
extern int cpu_id;
const char *name, *modifier, *vendorname;
int class = CPUCLASS_386, vendor, i, max;
int family, model, step, modif;
struct cpu_cpuid_nameclass *cpup = NULL;
void (*cpu_setup) __P((void));
if (cpuid_level == -1) {
#ifdef DIAGNOSTIC
if (cpu < 0 || cpu >=
(sizeof i386_nocpuid_cpus/sizeof(struct cpu_nocpuid_nameclass)))
panic("unknown cpu type %d\n", cpu);
#endif
name = i386_nocpuid_cpus[cpu].cpu_name;
vendor = i386_nocpuid_cpus[cpu].cpu_vendor;
vendorname = i386_nocpuid_cpus[cpu].cpu_vendorname;
class = i386_nocpuid_cpus[cpu].cpu_class;
cpu_setup = i386_nocpuid_cpus[cpu].cpu_setup;
modifier = "";
} else {
max = sizeof (i386_cpuid_cpus) / sizeof (i386_cpuid_cpus[0]);
modif = (cpu_id >> 12) & 3;
family = (cpu_id >> 8) & 15;
if (family < CPU_MINFAMILY)
panic("identifycpu: strange family value");
model = (cpu_id >> 4) & 15;
step = cpu_id & 15;
#ifdef CPUDEBUG
printf("cpu0: family %x model %x step %x\n", family, model,
step);
#endif
for (i = 0; i < max; i++) {
if (!strncmp(cpu_vendor,
i386_cpuid_cpus[i].cpu_id, 12)) {
cpup = &i386_cpuid_cpus[i];
break;
}
}
if (cpup == NULL) {
vendor = CPUVENDOR_UNKNOWN;
if (cpu_vendor[0] != '\0')
vendorname = &cpu_vendor[0];
else
vendorname = "Unknown";
if (family > CPU_MAXFAMILY)
family = CPU_MAXFAMILY;
class = family - 3;
modifier = "";
name = "";
cpu_setup = NULL;
} else {
vendor = cpup->cpu_vendor;
vendorname = cpup->cpu_vendorname;
modifier = modifiers[modif];
if (family > CPU_MAXFAMILY) {
family = CPU_MAXFAMILY;
model = CPU_DEFMODEL;
} else if (model > CPU_MAXMODEL)
model = CPU_DEFMODEL;
i = family - CPU_MINFAMILY;
name = cpup->cpu_family[i].cpu_models[model];
if (name == NULL)
name = cpup->cpu_family[i].cpu_models[CPU_DEFMODEL];
class = cpup->cpu_family[i].cpu_class;
cpu_setup = cpup->cpu_family[i].cpu_setup;
}
}
sprintf(cpu_model, "%s %s%s (%s-class)", vendorname, modifier, name,
classnames[class]);
printf("cpu0: %s\n", cpu_model);
cpu_class = class;
/*
* Now that we have told the user what they have,
* let them know if that machine type isn't configured.
*/
switch (cpu_class) {
#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) && !defined(I686_CPU)
#error No CPU classes configured.
#endif
#ifndef I686_CPU
case CPUCLASS_686:
printf("NOTICE: this kernel does not support Pentium Pro CPU class\n");
#ifdef I586_CPU
printf("NOTICE: lowering CPU class to i586\n");
cpu_class = CPUCLASS_586;
break;
#endif
#endif
#ifndef I586_CPU
case CPUCLASS_586:
printf("NOTICE: this kernel does not support Pentium CPU class\n");
#ifdef I486_CPU
printf("NOTICE: lowering CPU class to i486\n");
cpu_class = CPUCLASS_486;
break;
#endif
#endif
#ifndef I486_CPU
case CPUCLASS_486:
printf("NOTICE: this kernel does not support i486 CPU class\n");
#ifdef I386_CPU
printf("NOTICE: lowering CPU class to i386\n");
cpu_class = CPUCLASS_386;
break;
#endif
#endif
#ifndef I386_CPU
case CPUCLASS_386:
printf("NOTICE: this kernel does not support i386 CPU class\n");
panic("no appropriate CPU class available");
#endif
default:
break;
}
/* configure the CPU if needed */
if (cpu_setup != NULL)
cpu_setup();
if (cpu == CPU_486DLC) {
#ifndef CYRIX_CACHE_WORKS
printf("WARNING: CYRIX 486DLC CACHE UNCHANGED.\n");
#else
#ifndef CYRIX_CACHE_REALLY_WORKS
printf("WARNING: CYRIX 486DLC CACHE ENABLED IN HOLD-FLUSH MODE.\n");
#else
printf("WARNING: CYRIX 486DLC CACHE ENABLED.\n");
#endif
#endif
}
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
/*
* On a 486 or above, enable ring 0 write protection.
*/
if (cpu_class >= CPUCLASS_486)
lcr0(rcr0() | CR0_WP);
#endif
}
/*
* machine dependent system variables.
*/
int
cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
dev_t consdev;
struct btinfo_bootpath *bibp;
/* all sysctl names at this level are terminal */
if (namelen != 1)
return (ENOTDIR); /* overloaded */
switch (name[0]) {
case CPU_CONSDEV:
if (cn_tab != NULL)
consdev = cn_tab->cn_dev;
else
consdev = NODEV;
return (sysctl_rdstruct(oldp, oldlenp, newp, &consdev,
sizeof consdev));
case CPU_BIOSBASEMEM:
return (sysctl_rdint(oldp, oldlenp, newp, biosbasemem));
case CPU_BIOSEXTMEM:
return (sysctl_rdint(oldp, oldlenp, newp, biosextmem));
case CPU_NKPDE:
return (sysctl_rdint(oldp, oldlenp, newp, nkpde));
case CPU_BOOTED_KERNEL:
bibp = lookup_bootinfo(BTINFO_BOOTPATH);
if(!bibp)
return(ENOENT); /* ??? */
return (sysctl_rdstring(oldp, oldlenp, newp, bibp->bootpath));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
#ifdef COMPAT_IBCS2
void ibcs2_sendsig __P((sig_t, int, int, u_long));
void
ibcs2_sendsig(catcher, sig, mask, code)
sig_t catcher;
int sig, mask;
u_long code;
{
extern int bsd_to_ibcs2_sig[];
sendsig(catcher, bsd_to_ibcs2_sig[sig], mask, code);
}
#endif
/*
* Send an interrupt to process.
*
* Stack is set up to allow sigcode stored
* in u. to call routine, followed by kcall
* to sigreturn routine below. After sigreturn
* resets the signal mask, the stack, and the
* frame pointer, it returns to the user
* specified pc, psl.
*/
void
sendsig(catcher, sig, mask, code)
sig_t catcher;
int sig, mask;
u_long code;
{
register struct proc *p = curproc;
register struct trapframe *tf;
struct sigframe *fp, frame;
struct sigacts *psp = p->p_sigacts;
int oonstack;
extern char sigcode[], esigcode[];
/*
* Build the argument list for the signal handler.
*/
frame.sf_signum = sig;
tf = p->p_md.md_regs;
oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK;
/*
* Allocate space for the signal handler context.
*/
if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack &&
(psp->ps_sigonstack & sigmask(sig))) {
fp = (struct sigframe *)(psp->ps_sigstk.ss_sp +
psp->ps_sigstk.ss_size - sizeof(struct sigframe));
psp->ps_sigstk.ss_flags |= SS_ONSTACK;
} else {
fp = (struct sigframe *)tf->tf_esp - 1;
}
frame.sf_code = code;
frame.sf_scp = &fp->sf_sc;
frame.sf_handler = catcher;
/*
* Build the signal context to be used by sigreturn.
*/
frame.sf_sc.sc_err = tf->tf_err;
frame.sf_sc.sc_trapno = tf->tf_trapno;
frame.sf_sc.sc_onstack = oonstack;
frame.sf_sc.sc_mask = mask;
#ifdef VM86
if (tf->tf_eflags & PSL_VM) {
frame.sf_sc.sc_gs = tf->tf_vm86_gs;
frame.sf_sc.sc_fs = tf->tf_vm86_fs;
frame.sf_sc.sc_es = tf->tf_vm86_es;
frame.sf_sc.sc_ds = tf->tf_vm86_ds;
frame.sf_sc.sc_eflags = get_vflags(p);
} else
#endif
{
__asm("movl %%gs,%w0" : "=r" (frame.sf_sc.sc_gs));
__asm("movl %%fs,%w0" : "=r" (frame.sf_sc.sc_fs));
frame.sf_sc.sc_es = tf->tf_es;
frame.sf_sc.sc_ds = tf->tf_ds;
frame.sf_sc.sc_eflags = tf->tf_eflags;
}
frame.sf_sc.sc_edi = tf->tf_edi;
frame.sf_sc.sc_esi = tf->tf_esi;
frame.sf_sc.sc_ebp = tf->tf_ebp;
frame.sf_sc.sc_ebx = tf->tf_ebx;
frame.sf_sc.sc_edx = tf->tf_edx;
frame.sf_sc.sc_ecx = tf->tf_ecx;
frame.sf_sc.sc_eax = tf->tf_eax;
frame.sf_sc.sc_eip = tf->tf_eip;
frame.sf_sc.sc_cs = tf->tf_cs;
frame.sf_sc.sc_esp = tf->tf_esp;
frame.sf_sc.sc_ss = tf->tf_ss;
if (copyout(&frame, fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(p, SIGILL);
/* NOTREACHED */
}
/*
* Build context to run handler in.
*/
__asm("movl %w0,%%gs" : : "r" (GSEL(GUDATA_SEL, SEL_UPL)));
__asm("movl %w0,%%fs" : : "r" (GSEL(GUDATA_SEL, SEL_UPL)));
tf->tf_es = GSEL(GUDATA_SEL, SEL_UPL);
tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL);
tf->tf_eip = (int)(((char *)PS_STRINGS) - (esigcode - sigcode));
tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL);
tf->tf_eflags &= ~(PSL_T|PSL_VM|PSL_AC);
tf->tf_esp = (int)fp;
tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL);
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*/
int
sys_sigreturn(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_sigreturn_args /* {
syscallarg(struct sigcontext *) sigcntxp;
} */ *uap = v;
struct sigcontext *scp, context;
register struct trapframe *tf;
tf = p->p_md.md_regs;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, sigcntxp);
if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0)
return (EFAULT);
/*
* Restore signal context.
*/
#ifdef VM86
if (context.sc_eflags & PSL_VM) {
tf->tf_vm86_gs = context.sc_gs;
tf->tf_vm86_fs = context.sc_fs;
tf->tf_vm86_es = context.sc_es;
tf->tf_vm86_ds = context.sc_ds;
set_vflags(p, context.sc_eflags);
} else
#endif
{
/*
* Check for security violations. If we're returning to
* protected mode, the CPU will validate the segment registers
* automatically and generate a trap on violations. We handle
* the trap, rather than doing all of the checking here.
*/
if (((context.sc_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(context.sc_cs, context.sc_eflags))
return (EINVAL);
/* %fs and %gs were restored by the trampoline. */
tf->tf_es = context.sc_es;
tf->tf_ds = context.sc_ds;
tf->tf_eflags = context.sc_eflags;
}
tf->tf_edi = context.sc_edi;
tf->tf_esi = context.sc_esi;
tf->tf_ebp = context.sc_ebp;
tf->tf_ebx = context.sc_ebx;
tf->tf_edx = context.sc_edx;
tf->tf_ecx = context.sc_ecx;
tf->tf_eax = context.sc_eax;
tf->tf_eip = context.sc_eip;
tf->tf_cs = context.sc_cs;
tf->tf_esp = context.sc_esp;
tf->tf_ss = context.sc_ss;
if (context.sc_onstack & 01)
p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
else
p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK;
p->p_sigmask = context.sc_mask & ~sigcantmask;
return (EJUSTRETURN);
}
int waittime = -1;
struct pcb dumppcb;
void
cpu_reboot(howto, bootstr)
int howto;
char *bootstr;
{
extern int cold;
if (cold) {
howto |= RB_HALT;
goto haltsys;
}
boothowto = howto;
if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
waittime = 0;
vfs_shutdown();
/*
* If we've been adjusting the clock, the todr
* will be out of synch; adjust it now.
*/
resettodr();
}
/* Disable interrupts. */
splhigh();
/* Do a dump if requested. */
if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
dumpsys();
haltsys:
doshutdownhooks();
if (howto & RB_HALT) {
#if NAPM > 0 && !defined(APM_NO_POWEROFF)
/* turn off, if we can. But try to turn disk off and
* wait a bit first--some disk drives are slow to clean up
* and users have reported disk corruption.
*/
delay(500000);
apm_set_powstate(APM_DEV_DISK(0xff), APM_SYS_OFF);
delay(500000);
apm_set_powstate(APM_DEV_ALLDEVS, APM_SYS_OFF);
#endif
printf("\n");
printf("The operating system has halted.\n");
printf("Please press any key to reboot.\n\n");
cngetc();
}
printf("rebooting...\n");
cpu_reset();
for(;;) ;
/*NOTREACHED*/
}
/*
* These variables are needed by /sbin/savecore
*/
u_long dumpmag = 0x8fca0101; /* magic number */
int dumpsize = 0; /* pages */
long dumplo = 0; /* blocks */
/*
* This is called by main to set dumplo and dumpsize.
* Dumps always skip the first CLBYTES of disk space
* in case there might be a disk label stored there.
* If there is extra space, put dump at the end to
* reduce the chance that swapping trashes it.
*/
void
cpu_dumpconf()
{
int nblks; /* size of dump area */
int maj;
if (dumpdev == NODEV)
return;
maj = major(dumpdev);
if (maj < 0 || maj >= nblkdev)
panic("dumpconf: bad dumpdev=0x%x", dumpdev);
if (bdevsw[maj].d_psize == NULL)
return;
nblks = (*bdevsw[maj].d_psize)(dumpdev);
if (nblks <= ctod(1))
return;
dumpsize = btoc(IOM_END + ctob(dumpmem_high));
/* Always skip the first CLBYTES, in case there is a label there. */
if (dumplo < ctod(1))
dumplo = ctod(1);
/* Put dump at end of partition, and make it fit. */
if (dumpsize > dtoc(nblks - dumplo))
dumpsize = dtoc(nblks - dumplo);
if (dumplo < nblks - ctod(dumpsize))
dumplo = nblks - ctod(dumpsize);
}
/*
* Doadump comes here after turning off memory management and
* getting on the dump stack, either when called above, or by
* the auto-restart code.
*/
#define BYTES_PER_DUMP NBPG /* must be a multiple of pagesize XXX small */
static vm_offset_t dumpspace;
vm_offset_t
reserve_dumppages(p)
vm_offset_t p;
{
dumpspace = p;
return (p + BYTES_PER_DUMP);
}
void
dumpsys()
{
unsigned bytes, i, n;
int maddr, psize;
daddr_t blkno;
int (*dump) __P((dev_t, daddr_t, caddr_t, size_t));
int error;
/* Save registers. */
savectx(&dumppcb);
msgbufmapped = 0; /* don't record dump msgs in msgbuf */
if (dumpdev == NODEV)
return;
/*
* For dumps during autoconfiguration,
* if dump device has already configured...
*/
if (dumpsize == 0)
cpu_dumpconf();
if (dumplo <= 0) {
printf("\ndump to dev %u,%u not possible\n", major(dumpdev),
minor(dumpdev));
return;
}
printf("\ndumping to dev %u,%u offset %ld\n", major(dumpdev),
minor(dumpdev), dumplo);
psize = (*bdevsw[major(dumpdev)].d_psize)(dumpdev);
printf("dump ");
if (psize == -1) {
printf("area unavailable\n");
return;
}
#if 0 /* XXX this doesn't work. grr. */
/* toss any characters present prior to dump */
while (sget() != NULL); /*syscons and pccons differ */
#endif
bytes = ctob(dumpmem_high) + IOM_END;
maddr = 0;
blkno = dumplo;
dump = bdevsw[major(dumpdev)].d_dump;
error = 0;
for (i = 0; i < bytes; i += n) {
/*
* Avoid dumping the ISA memory hole, and areas that
* BIOS claims aren't in low memory.
*/
if (i >= ctob(dumpmem_low) && i < IOM_END) {
n = IOM_END - i;
maddr += n;
blkno += btodb(n);
continue;
}
/* Print out how many MBs we to go. */
n = bytes - i;
if (n && (n % (1024*1024)) == 0)
printf("%d ", n / (1024 * 1024));
/* Limit size for next transfer. */
if (n > BYTES_PER_DUMP)
n = BYTES_PER_DUMP;
(void) pmap_map(dumpspace, maddr, maddr + n, VM_PROT_READ);
error = (*dump)(dumpdev, blkno, (caddr_t)dumpspace, n);
if (error)
break;
maddr += n;
blkno += btodb(n); /* XXX? */
#if 0 /* XXX this doesn't work. grr. */
/* operator aborting dump? */
if (sget() != NULL) {
error = EINTR;
break;
}
#endif
}
switch (error) {
case ENXIO:
printf("device bad\n");
break;
case EFAULT:
printf("device not ready\n");
break;
case EINVAL:
printf("area improper\n");
break;
case EIO:
printf("i/o error\n");
break;
case EINTR:
printf("aborted from console\n");
break;
case 0:
printf("succeeded\n");
break;
default:
printf("error %d\n", error);
break;
}
printf("\n\n");
delay(5000000); /* 5 seconds */
}
/*
* Clear registers on exec
*/
void
setregs(p, pack, stack)
struct proc *p;
struct exec_package *pack;
u_long stack;
{
register struct pcb *pcb = &p->p_addr->u_pcb;
register struct trapframe *tf;
#if NNPX > 0
/* If we were using the FPU, forget about it. */
if (npxproc == p)
npxdrop();
#endif
#ifdef USER_LDT
if (pcb->pcb_flags & PCB_USER_LDT)
i386_user_cleanup(pcb);
#endif
p->p_md.md_flags &= ~MDP_USEDFPU;
pcb->pcb_flags = 0;
pcb->pcb_savefpu.sv_env.en_cw = __NetBSD_NPXCW__;
tf = p->p_md.md_regs;
__asm("movl %w0,%%gs" : : "r" (LSEL(LUDATA_SEL, SEL_UPL)));
__asm("movl %w0,%%fs" : : "r" (LSEL(LUDATA_SEL, SEL_UPL)));
tf->tf_es = LSEL(LUDATA_SEL, SEL_UPL);
tf->tf_ds = LSEL(LUDATA_SEL, SEL_UPL);
tf->tf_edi = 0;
tf->tf_esi = 0;
tf->tf_ebp = 0;
tf->tf_ebx = (int)PS_STRINGS;
tf->tf_edx = 0;
tf->tf_ecx = 0;
tf->tf_eax = 0;
tf->tf_eip = pack->ep_entry;
tf->tf_cs = LSEL(LUCODE_SEL, SEL_UPL);
tf->tf_eflags = PSL_USERSET;
tf->tf_esp = stack;
tf->tf_ss = LSEL(LUDATA_SEL, SEL_UPL);
}
/*
* Initialize segments and descriptor tables
*/
union descriptor *idt, *gdt, *ldt;
#ifdef I586_CPU
union descriptor *pentium_idt;
#endif
extern struct user *proc0paddr;
void
setgate(gd, func, args, type, dpl)
struct gate_descriptor *gd;
void *func;
int args, type, dpl;
{
gd->gd_looffset = (int)func;
gd->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
gd->gd_stkcpy = args;
gd->gd_xx = 0;
gd->gd_type = type;
gd->gd_dpl = dpl;
gd->gd_p = 1;
gd->gd_hioffset = (int)func >> 16;
}
void
setregion(rd, base, limit)
struct region_descriptor *rd;
void *base;
size_t limit;
{
rd->rd_limit = (int)limit;
rd->rd_base = (int)base;
}
void
setsegment(sd, base, limit, type, dpl, def32, gran)
struct segment_descriptor *sd;
void *base;
size_t limit;
int type, dpl, def32, gran;
{
sd->sd_lolimit = (int)limit;
sd->sd_lobase = (int)base;
sd->sd_type = type;
sd->sd_dpl = dpl;
sd->sd_p = 1;
sd->sd_hilimit = (int)limit >> 16;
sd->sd_xx = 0;
sd->sd_def32 = def32;
sd->sd_gran = gran;
sd->sd_hibase = (int)base >> 24;
}
#define IDTVEC(name) __CONCAT(X, name)
extern IDTVEC(syscall), IDTVEC(osyscall);
extern *IDTVEC(exceptions)[];
void
init386(first_avail)
vm_offset_t first_avail;
{
int x;
struct region_descriptor region;
extern void consinit __P((void));
proc0.p_addr = proc0paddr;
#if defined(PMAP_NEW)
/* XXX: PMAP_NEW requires valid curpcb. also init'd in cpu_startup */
curpcb = &proc0.p_addr->u_pcb;
#endif
/*
* Initialize the I/O port and I/O mem extent maps.
* Note: we don't have to check the return value since
* creation of a fixed extent map will never fail (since
* descriptor storage has already been allocated).
*
* N.B. The iomem extent manages _all_ physical addresses
* on the machine. When the amount of RAM is found, the two
* extents of RAM are allocated from the map (0 -> ISA hole
* and end of ISA hole -> end of RAM).
*/
ioport_ex = extent_create("ioport", 0x0, 0xffff, M_DEVBUF,
(caddr_t)ioport_ex_storage, sizeof(ioport_ex_storage),
EX_NOCOALESCE|EX_NOWAIT);
iomem_ex = extent_create("iomem", 0x0, 0xffffffff, M_DEVBUF,
(caddr_t)iomem_ex_storage, sizeof(iomem_ex_storage),
EX_NOCOALESCE|EX_NOWAIT);
consinit(); /* XXX SHOULD NOT BE DONE HERE */
/*
* Allocate the physical addresses used by RAM from the iomem
* extent map. This is done before the addresses are
* page rounded just to make sure we get them all.
*/
if (extent_alloc_region(iomem_ex, 0, biosbasemem * 1024, EX_NOWAIT)) {
/* XXX What should we do? */
printf("WARNING: CAN'T ALLOCATE BASE MEMORY FROM IOMEM EXTENT MAP!\n");
}
if (extent_alloc_region(iomem_ex, IOM_END, biosextmem * 1024,
EX_NOWAIT)) {
/* XXX What should we do? */
printf("WARNING: CAN'T ALLOCATE EXTENDED MEMORY FROM IOMEM EXTENT MAP!\n");
}
#if NISADMA > 0
/*
* Some motherboards/BIOSes remap the 384K of RAM that would
* normally be covered by the ISA hole to the end of memory
* so that it can be used. However, on a 16M system, this
* would cause bounce buffers to be allocated and used.
* This is not desirable behaviour, as more than 384K of
* bounce buffers might be allocated. As a work-around,
* we round memory down to the nearest 1M boundary if
* we're using any isadma devices and the remapped memory
* is what puts us over 16M.
*/
if (biosextmem > (15*1024) && biosextmem < (16*1024)) {
printf("Warning: ignoring %dk of remapped memory\n",
biosextmem - (15*1024));
biosextmem = (15*1024);
}
#endif
#if NBIOSCALL > 0
avail_start = 2*NBPG; /* save us a page! */
#else
avail_start = NBPG; /* BIOS leaves data in low memory */
/* and VM system doesn't work with phys 0 */
#endif
avail_end = IOM_END + trunc_page(biosextmem * 1024);
hole_start = trunc_page(biosbasemem * 1024);
/* we load right after the I/O hole; adjust hole_end to compensate */
hole_end = round_page(first_avail);
/* Call pmap initialization to make new kernel address space. */
pmap_bootstrap((vm_offset_t)atdevbase + IOM_SIZE);
#if !defined(MACHINE_NEW_NONCONTIG)
/*
* Initialize for pmap_free_pages and pmap_next_page.
*/
avail_next = avail_start;
#endif
pmap_enter(pmap_kernel(), idt_vaddr, idt_paddr, VM_PROT_ALL, TRUE);
idt = (union descriptor *)idt_vaddr;
#ifdef I586_CPU
pmap_enter(pmap_kernel(), pentium_idt_vaddr, idt_paddr, VM_PROT_READ,
TRUE);
pentium_idt = (union descriptor *)pentium_idt_vaddr;
#endif
gdt = idt + NIDT;
ldt = gdt + NGDT;
/* make gdt gates and memory segments */
setsegment(&gdt[GCODE_SEL].sd, 0, 0xfffff, SDT_MEMERA, SEL_KPL, 1, 1);
setsegment(&gdt[GDATA_SEL].sd, 0, 0xfffff, SDT_MEMRWA, SEL_KPL, 1, 1);
setsegment(&gdt[GLDT_SEL].sd, ldt, NLDT * sizeof(ldt[0]) - 1,
SDT_SYSLDT, SEL_KPL, 0, 0);
setsegment(&gdt[GUCODE_SEL].sd, 0, i386_btop(VM_MAXUSER_ADDRESS) - 1,
SDT_MEMERA, SEL_UPL, 1, 1);
setsegment(&gdt[GUDATA_SEL].sd, 0, i386_btop(VM_MAXUSER_ADDRESS) - 1,
SDT_MEMRWA, SEL_UPL, 1, 1);
#if NBIOSCALL > 0
/* bios trampoline GDT entries */
setsegment(&gdt[GBIOSCODE_SEL].sd, 0, 0xfffff, SDT_MEMERA, SEL_KPL, 0,
0);
setsegment(&gdt[GBIOSDATA_SEL].sd, 0, 0xfffff, SDT_MEMRWA, SEL_KPL, 0,
0);
#endif
/* make ldt gates and memory segments */
setgate(&ldt[LSYS5CALLS_SEL].gd, &IDTVEC(osyscall), 1,
SDT_SYS386CGT, SEL_UPL);
ldt[LUCODE_SEL] = gdt[GUCODE_SEL];
ldt[LUDATA_SEL] = gdt[GUDATA_SEL];
ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
/* exceptions */
for (x = 0; x < 32; x++)
setgate(&idt[x].gd, IDTVEC(exceptions)[x], 0, SDT_SYS386TGT,
(x == 3 || x == 4) ? SEL_UPL : SEL_KPL);
/* new-style interrupt gate for syscalls */
setgate(&idt[128].gd, &IDTVEC(syscall), 0, SDT_SYS386TGT, SEL_UPL);
setregion(®ion, gdt, NGDT * sizeof(gdt[0]) - 1);
lgdt(®ion);
#ifdef I586_CPU
setregion(®ion, pentium_idt, NIDT * sizeof(idt[0]) - 1);
#else
setregion(®ion, idt, NIDT * sizeof(idt[0]) - 1);
#endif
lidt(®ion);
#ifdef DDB
ddb_init();
if (boothowto & RB_KDB)
Debugger();
#endif
#ifdef KGDB
kgdb_port_init();
if (boothowto & RB_KDB) {
kgdb_debug_init = 1;
kgdb_connect(1);
}
#endif
#if NISA > 0
isa_defaultirq();
#endif
splraise(-1);
enable_intr();
/* number of pages of physmem addr space */
physmem = btoc(biosbasemem * 1024) + btoc(biosextmem * 1024);
dumpmem_low = btoc(biosbasemem * 1024);
dumpmem_high = btoc(biosextmem * 1024);
if (physmem < btoc(2 * 1024 * 1024)) {
printf("warning: too little memory available; "
"have %d bytes, want %d bytes\n"
"running in degraded mode\n"
"press a key to confirm\n\n",
ctob(physmem), 2*1024*1024);
cngetc();
}
}
struct queue {
struct queue *q_next, *q_prev;
};
/*
* insert an element into a queue
*/
void
_insque(v1, v2)
void *v1;
void *v2;
{
register struct queue *elem = v1, *head = v2;
register struct queue *next;
next = head->q_next;
elem->q_next = next;
head->q_next = elem;
elem->q_prev = head;
next->q_prev = elem;
}
/*
* remove an element from a queue
*/
void
_remque(v)
void *v;
{
register struct queue *elem = v;
register struct queue *next, *prev;
next = elem->q_next;
prev = elem->q_prev;
next->q_prev = prev;
prev->q_next = next;
elem->q_prev = 0;
}
#ifdef COMPAT_NOMID
static int
exec_nomid(p, epp)
struct proc *p;
struct exec_package *epp;
{
int error;
u_long midmag, magic;
u_short mid;
struct exec *execp = epp->ep_hdr;
/* check on validity of epp->ep_hdr performed by exec_out_makecmds */
midmag = ntohl(execp->a_midmag);
mid = (midmag >> 16) & 0xffff;
magic = midmag & 0xffff;
if (magic == 0) {
magic = (execp->a_midmag & 0xffff);
mid = MID_ZERO;
}
midmag = mid << 16 | magic;
switch (midmag) {
case (MID_ZERO << 16) | ZMAGIC:
/*
* 386BSD's ZMAGIC format:
*/
error = exec_aout_prep_oldzmagic(p, epp);
break;
case (MID_ZERO << 16) | QMAGIC:
/*
* BSDI's QMAGIC format:
* same as new ZMAGIC format, but with different magic number
*/
error = exec_aout_prep_zmagic(p, epp);
break;
case (MID_ZERO << 16) | NMAGIC:
/*
* BSDI's NMAGIC format:
* same as NMAGIC format, but with different magic number
* and with text starting at 0.
*/
error = exec_aout_prep_oldnmagic(p, epp);
break;
case (MID_ZERO << 16) | OMAGIC:
/*
* BSDI's OMAGIC format:
* same as OMAGIC format, but with different magic number
* and with text starting at 0.
*/
error = exec_aout_prep_oldomagic(p, epp);
break;
default:
error = ENOEXEC;
}
return error;
}
#endif
/*
* cpu_exec_aout_makecmds():
* cpu-dependent a.out format hook for execve().
*
* Determine of the given exec package refers to something which we
* understand and, if so, set up the vmcmds for it.
*
* On the i386, old (386bsd) ZMAGIC binaries and BSDI QMAGIC binaries
* if COMPAT_NOMID is given as a kernel option.
*/
int
cpu_exec_aout_makecmds(p, epp)
struct proc *p;
struct exec_package *epp;
{
int error = ENOEXEC;
#ifdef COMPAT_NOMID
if ((error = exec_nomid(p, epp)) == 0)
return error;
#endif /* ! COMPAT_NOMID */
return error;
}
#if !defined(MACHINE_NEW_NONCONTIG)
u_int
pmap_free_pages()
{
if (avail_next <= hole_start)
return ((hole_start - avail_next) / NBPG +
(avail_end - hole_end) / NBPG);
else
return ((avail_end - avail_next) / NBPG);
}
int
pmap_next_page(addrp)
vm_offset_t *addrp;
{
if (avail_next + NBPG > avail_end)
return FALSE;
if (avail_next + NBPG > hole_start && avail_next < hole_end)
avail_next = hole_end;
*addrp = avail_next;
avail_next += NBPG;
return TRUE;
}
int
pmap_page_index(pa)
vm_offset_t pa;
{
if (pa >= avail_start && pa < hole_start)
return i386_btop(pa - avail_start);
if (pa >= hole_end && pa < avail_end)
return i386_btop(pa - hole_end + hole_start - avail_start);
return -1;
}
#endif
void *
lookup_bootinfo(type)
int type;
{
struct btinfo_common *help;
int n = *(int*)bootinfo;
help = (struct btinfo_common *)(bootinfo + sizeof(int));
while(n--) {
if(help->type == type)
return(help);
help = (struct btinfo_common *)((char*)help + help->len);
}
return(0);
}
/*
* consinit:
* initialize the system console.
* XXX - shouldn't deal with this initted thing, but then,
* it shouldn't be called from init386 either.
*/
void
consinit()
{
struct btinfo_console *consinfo;
static int initted;
if (initted)
return;
initted = 1;
#ifndef CONS_OVERRIDE
consinfo = lookup_bootinfo(BTINFO_CONSOLE);
if(!consinfo)
#endif
consinfo = &default_consinfo;
#if (NPC > 0) || (NVT > 0)
if(!strcmp(consinfo->devname, "pc")) {
pccnattach();
return;
}
#endif
#if (NCOM > 0)
if(!strcmp(consinfo->devname, "com")) {
bus_space_tag_t tag = I386_BUS_SPACE_IO;
if(comcnattach(tag, consinfo->addr, consinfo->speed,
COM_FREQ, comcnmode))
panic("can't init serial console @%x", consinfo->addr);
return;
}
#endif
panic("invalid console device %s", consinfo->devname);
}
#ifdef KGDB
void
kgdb_port_init()
{
#if (NCOM > 0)
if(!strcmp(kgdb_devname, "com")) {
bus_space_tag_t tag = I386_BUS_SPACE_IO;
com_kgdb_attach(tag, comkgdbaddr, comkgdbrate, COM_FREQ,
comkgdbmode);
}
#endif
}
#endif
void
cpu_reset()
{
disable_intr();
/*
* The keyboard controller has 4 random output pins, one of which is
* connected to the RESET pin on the CPU in many PCs. We tell the
* keyboard controller to pulse this line a couple of times.
*/
outb(IO_KBD + KBCMDP, KBC_PULSE0);
delay(100000);
outb(IO_KBD + KBCMDP, KBC_PULSE0);
delay(100000);
/*
* Try to cause a triple fault and watchdog reset by making the IDT
* invalid and causing a fault.
*/
bzero((caddr_t)idt, NIDT * sizeof(idt[0]));
__asm __volatile("divl %0,%1" : : "q" (0), "a" (0));
#if 0
/*
* Try to cause a triple fault and watchdog reset by unmapping the
* entire address space and doing a TLB flush.
*/
bzero((caddr_t)PTD, NBPG);
pmap_update();
#endif
for (;;);
}
int
i386_memio_map(t, bpa, size, flags, bshp)
bus_space_tag_t t;
bus_addr_t bpa;
bus_size_t size;
int flags;
bus_space_handle_t *bshp;
{
int error;
struct extent *ex;
/*
* Pick the appropriate extent map.
*/
if (t == I386_BUS_SPACE_IO) {
if (flags & BUS_SPACE_MAP_LINEAR)
return (EOPNOTSUPP);
ex = ioport_ex;
} else if (t == I386_BUS_SPACE_MEM)
ex = iomem_ex;
else
panic("i386_memio_map: bad bus space tag");
/*
* Before we go any further, let's make sure that this
* region is available.
*/
error = extent_alloc_region(ex, bpa, size,
EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0));
if (error)
return (error);
/*
* For I/O space, that's all she wrote.
*/
if (t == I386_BUS_SPACE_IO) {
*bshp = bpa;
return (0);
}
/*
* For memory space, map the bus physical address to
* a kernel virtual address.
*/
error = i386_mem_add_mapping(bpa, size,
(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp);
if (error) {
if (extent_free(ex, bpa, size, EX_NOWAIT |
(ioport_malloc_safe ? EX_MALLOCOK : 0))) {
printf("i386_memio_map: pa 0x%lx, size 0x%lx\n",
bpa, size);
printf("i386_memio_map: can't free region\n");
}
}
return (error);
}
int
_i386_memio_map(t, bpa, size, flags, bshp)
bus_space_tag_t t;
bus_addr_t bpa;
bus_size_t size;
int flags;
bus_space_handle_t *bshp;
{
/*
* For I/O space, just fill in the handle.
*/
if (t == I386_BUS_SPACE_IO) {
if (flags & BUS_SPACE_MAP_LINEAR)
return (EOPNOTSUPP);
*bshp = bpa;
return (0);
}
/*
* For memory space, map the bus physical address to
* a kernel virtual address.
*/
return (i386_mem_add_mapping(bpa, size,
(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp));
}
int
i386_memio_alloc(t, rstart, rend, size, alignment, boundary, flags,
bpap, bshp)
bus_space_tag_t t;
bus_addr_t rstart, rend;
bus_size_t size, alignment, boundary;
int flags;
bus_addr_t *bpap;
bus_space_handle_t *bshp;
{
struct extent *ex;
u_long bpa;
int error;
/*
* Pick the appropriate extent map.
*/
if (t == I386_BUS_SPACE_IO) {
if (flags & BUS_SPACE_MAP_LINEAR)
return (EOPNOTSUPP);
ex = ioport_ex;
} else if (t == I386_BUS_SPACE_MEM)
ex = iomem_ex;
else
panic("i386_memio_alloc: bad bus space tag");
/*
* Sanity check the allocation against the extent's boundaries.
*/
if (rstart < ex->ex_start || rend > ex->ex_end)
panic("i386_memio_alloc: bad region start/end");
/*
* Do the requested allocation.
*/
error = extent_alloc_subregion(ex, rstart, rend, size, alignment,
boundary, EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0),
&bpa);
if (error)
return (error);
/*
* For I/O space, that's all she wrote.
*/
if (t == I386_BUS_SPACE_IO) {
*bshp = *bpap = bpa;
return (0);
}
/*
* For memory space, map the bus physical address to
* a kernel virtual address.
*/
error = i386_mem_add_mapping(bpa, size,
(flags & BUS_SPACE_MAP_CACHEABLE) != 0, bshp);
if (error) {
if (extent_free(iomem_ex, bpa, size, EX_NOWAIT |
(ioport_malloc_safe ? EX_MALLOCOK : 0))) {
printf("i386_memio_alloc: pa 0x%lx, size 0x%lx\n",
bpa, size);
printf("i386_memio_alloc: can't free region\n");
}
}
*bpap = bpa;
return (error);
}
int
i386_mem_add_mapping(bpa, size, cacheable, bshp)
bus_addr_t bpa;
bus_size_t size;
int cacheable;
bus_space_handle_t *bshp;
{
u_long pa, endpa;
vm_offset_t va;
pt_entry_t *pte;
pa = i386_trunc_page(bpa);
endpa = i386_round_page(bpa + size);
#ifdef DIAGNOSTIC
if (endpa <= pa)
panic("i386_mem_add_mapping: overflow");
#endif
#if defined(UVM)
va = uvm_km_valloc(kernel_map, endpa - pa);
#else
va = kmem_alloc_pageable(kernel_map, endpa - pa);
#endif
if (va == 0)
return (ENOMEM);
*bshp = (bus_space_handle_t)(va + (bpa & PGOFSET));
for (; pa < endpa; pa += NBPG, va += NBPG) {
pmap_enter(pmap_kernel(), va, pa,
VM_PROT_READ | VM_PROT_WRITE, TRUE);
/*
* PG_N doesn't exist on 386's, so we assume that
* the mainboard has wired up device space non-cacheable
* on those machines.
*/
if (cpu_class != CPUCLASS_386) {
pte = kvtopte(va);
if (cacheable)
*pte &= ~PG_N;
else
*pte |= PG_N;
#if defined(PMAP_NEW)
pmap_update_pg(va);
#else
pmap_update();
#endif
}
}
return 0;
}
void
i386_memio_unmap(t, bsh, size)
bus_space_tag_t t;
bus_space_handle_t bsh;
bus_size_t size;
{
struct extent *ex;
u_long va, endva;
bus_addr_t bpa;
/*
* Find the correct extent and bus physical address.
*/
if (t == I386_BUS_SPACE_IO) {
ex = ioport_ex;
bpa = bsh;
} else if (t == I386_BUS_SPACE_MEM) {
ex = iomem_ex;
va = i386_trunc_page(bsh);
endva = i386_round_page(bsh + size);
#ifdef DIAGNOSTIC
if (endva <= va)
panic("i386_memio_unmap: overflow");
#endif
bpa = pmap_extract(pmap_kernel(), va) + (bsh & PGOFSET);
/*
* Free the kernel virtual mapping.
*/
#if defined(UVM)
uvm_km_free(kernel_map, va, endva - va);
#else
kmem_free(kernel_map, va, endva - va);
#endif
} else
panic("i386_memio_unmap: bad bus space tag");
if (extent_free(ex, bpa, size,
EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0))) {
printf("i386_memio_unmap: %s 0x%lx, size 0x%lx\n",
(t == I386_BUS_SPACE_IO) ? "port" : "pa", bpa, size);
printf("i386_memio_unmap: can't free region\n");
}
}
void
i386_memio_free(t, bsh, size)
bus_space_tag_t t;
bus_space_handle_t bsh;
bus_size_t size;
{
/* i386_memio_unmap() does all that we need to do. */
i386_memio_unmap(t, bsh, size);
}
int
i386_memio_subregion(t, bsh, offset, size, nbshp)
bus_space_tag_t t;
bus_space_handle_t bsh;
bus_size_t offset, size;
bus_space_handle_t *nbshp;
{
*nbshp = bsh + offset;
return (0);
}
/*
* Common function for DMA map creation. May be called by bus-specific
* DMA map creation functions.
*/
int
_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
bus_dma_tag_t t;
bus_size_t size;
int nsegments;
bus_size_t maxsegsz;
bus_size_t boundary;
int flags;
bus_dmamap_t *dmamp;
{
struct i386_bus_dmamap *map;
void *mapstore;
size_t mapsize;
/*
* Allocate and initialize the DMA map. The end of the map
* is a variable-sized array of segments, so we allocate enough
* room for them in one shot.
*
* Note we don't preserve the WAITOK or NOWAIT flags. Preservation
* of ALLOCNOW notifies others that we've reserved these resources,
* and they are not to be freed.
*
* The bus_dmamap_t includes one bus_dma_segment_t, hence
* the (nsegments - 1).
*/
mapsize = sizeof(struct i386_bus_dmamap) +
(sizeof(bus_dma_segment_t) * (nsegments - 1));
if ((mapstore = malloc(mapsize, M_DEVBUF,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
return (ENOMEM);
bzero(mapstore, mapsize);
map = (struct i386_bus_dmamap *)mapstore;
map->_dm_size = size;
map->_dm_segcnt = nsegments;
map->_dm_maxsegsz = maxsegsz;
map->_dm_boundary = boundary;
map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
map->dm_mapsize = 0; /* no valid mappings */
map->dm_nsegs = 0;
*dmamp = map;
return (0);
}
/*
* Common function for DMA map destruction. May be called by bus-specific
* DMA map destruction functions.
*/
void
_bus_dmamap_destroy(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
free(map, M_DEVBUF);
}
/*
* Common function for loading a DMA map with a linear buffer. May
* be called by bus-specific DMA map load functions.
*/
int
_bus_dmamap_load(t, map, buf, buflen, p, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
{
vm_offset_t lastaddr;
int seg, error;
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
if (buflen > map->_dm_size)
return (EINVAL);
seg = 0;
error = _bus_dmamap_load_buffer(map, buf, buflen, p, flags,
&lastaddr, &seg, 1);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
}
return (error);
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf(t, map, m0, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct mbuf *m0;
int flags;
{
vm_offset_t lastaddr;
int seg, error, first;
struct mbuf *m;
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
first = 1;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
error = _bus_dmamap_load_buffer(map, m->m_data, m->m_len,
NULL, flags, &lastaddr, &seg, first);
first = 0;
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
map->dm_nsegs = seg + 1;
}
return (error);
}
/*
* Like _bus_dmamap_load(), but for uios.
*/
int
_bus_dmamap_load_uio(t, map, uio, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct uio *uio;
int flags;
{
panic("_bus_dmamap_load_uio: not implemented");
}
/*
* Like _bus_dmamap_load(), but for raw memory allocated with
* bus_dmamem_alloc().
*/
int
_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_dma_segment_t *segs;
int nsegs;
bus_size_t size;
int flags;
{
panic("_bus_dmamap_load_raw: not implemented");
}
/*
* Common function for unloading a DMA map. May be called by
* bus-specific DMA map unload functions.
*/
void
_bus_dmamap_unload(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
/*
* No resources to free; just mark the mappings as
* invalid.
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
}
/*
* Common function for DMA map synchronization. May be called
* by bus-specific DMA map synchronization functions.
*/
void
_bus_dmamap_sync(t, map, offset, len, ops)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_addr_t offset;
bus_size_t len;
int ops;
{
/* Nothing to do here. */
}
/*
* Common function for DMA-safe memory allocation. May be called
* by bus-specific DMA memory allocation functions.
*/
int
_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
bus_dma_tag_t t;
bus_size_t size, alignment, boundary;
bus_dma_segment_t *segs;
int nsegs;
int *rsegs;
int flags;
{
return (_bus_dmamem_alloc_range(t, size, alignment, boundary,
segs, nsegs, rsegs, flags, 0, trunc_page(avail_end)));
}
/*
* Common function for freeing DMA-safe memory. May be called by
* bus-specific DMA memory free functions.
*/
void
_bus_dmamem_free(t, segs, nsegs)
bus_dma_tag_t t;
bus_dma_segment_t *segs;
int nsegs;
{
vm_page_t m;
bus_addr_t addr;
struct pglist mlist;
int curseg;
/*
* Build a list of pages to free back to the VM system.
*/
TAILQ_INIT(&mlist);
for (curseg = 0; curseg < nsegs; curseg++) {
for (addr = segs[curseg].ds_addr;
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
addr += PAGE_SIZE) {
m = PHYS_TO_VM_PAGE(addr);
TAILQ_INSERT_TAIL(&mlist, m, pageq);
}
}
#if defined(UVM)
uvm_pglistfree(&mlist);
#else
vm_page_free_memory(&mlist);
#endif
}
/*
* Common function for mapping DMA-safe memory. May be called by
* bus-specific DMA memory map functions.
*/
int
_bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
bus_dma_tag_t t;
bus_dma_segment_t *segs;
int nsegs;
size_t size;
caddr_t *kvap;
int flags;
{
vm_offset_t va;
bus_addr_t addr;
int curseg, s;
size = round_page(size);
#if defined(UVM)
/*
* VALLOC some unmapped VAs from kmem_map
*
* NOTE: all access to kmem_map/kmem_object must be at splimp
*/
s = splimp();
va = uvm_km_kmemalloc(kmem_map, uvmexp.kmem_object, size,
UVM_KMF_VALLOC);
splx(s);
#else
s = splimp();
va = kmem_alloc_pageable(kmem_map, size);
splx(s);
#endif
if (va == 0)
return (ENOMEM);
*kvap = (caddr_t)va;
for (curseg = 0; curseg < nsegs; curseg++) {
for (addr = segs[curseg].ds_addr;
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
addr += NBPG, va += NBPG, size -= NBPG) {
if (size == 0)
panic("_bus_dmamem_map: size botch");
#if defined(PMAP_NEW)
pmap_kenter_pa(va, addr, VM_PROT_READ | VM_PROT_WRITE);
#else
pmap_enter(pmap_kernel(), va, addr,
VM_PROT_READ | VM_PROT_WRITE, TRUE);
#endif
}
}
return (0);
}
/*
* Common function for unmapping DMA-safe memory. May be called by
* bus-specific DMA memory unmapping functions.
*/
void
_bus_dmamem_unmap(t, kva, size)
bus_dma_tag_t t;
caddr_t kva;
size_t size;
{
int s;
#ifdef DIAGNOSTIC
if ((u_long)kva & PGOFSET)
panic("_bus_dmamem_unmap");
#endif
size = round_page(size);
#if defined(UVM)
/*
* NOTE: all accesses through kmem_map must be at splimp
*/
s = splimp();
uvm_km_free(kmem_map, (vm_offset_t)kva, size);
splx(s);
#else
s = splimp();
kmem_free(kmem_map, (vm_offset_t)kva, size);
splx(s);
#endif
}
/*
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
* bus-specific DMA mmap(2)'ing functions.
*/
int
_bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
bus_dma_tag_t t;
bus_dma_segment_t *segs;
int nsegs, off, prot, flags;
{
int i;
for (i = 0; i < nsegs; i++) {
#ifdef DIAGNOSTIC
if (off & PGOFSET)
panic("_bus_dmamem_mmap: offset unaligned");
if (segs[i].ds_addr & PGOFSET)
panic("_bus_dmamem_mmap: segment unaligned");
if (segs[i].ds_len & PGOFSET)
panic("_bus_dmamem_mmap: segment size not multiple"
" of page size");
#endif
if (off >= segs[i].ds_len) {
off -= segs[i].ds_len;
continue;
}
return (i386_btop((caddr_t)segs[i].ds_addr + off));
}
/* Page not found. */
return (-1);
}
/**********************************************************************
* DMA utility functions
**********************************************************************/
/*
* Utility function to load a linear buffer. lastaddrp holds state
* between invocations (for multiple-buffer loads). segp contains
* the starting segment on entrace, and the ending segment on exit.
* first indicates if this is the first invocation of this function.
*/
int
_bus_dmamap_load_buffer(map, buf, buflen, p, flags, lastaddrp, segp, first)
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
vm_offset_t *lastaddrp;
int *segp;
int first;
{
bus_size_t sgsize;
bus_addr_t curaddr, lastaddr;
caddr_t vaddr = buf;
int seg;
pmap_t pmap;
if (p != NULL)
pmap = p->p_vmspace->vm_map.pmap;
else
pmap = pmap_kernel();
lastaddr = *lastaddrp;
for (seg = *segp; buflen > 0 && seg < map->_dm_segcnt; ) {
/*
* Get the physical address for this segment.
*/
curaddr = (bus_addr_t)pmap_extract(pmap, (vm_offset_t)vaddr);
/*
* Compute the segment size, and adjust counts.
*/
sgsize = NBPG - ((u_long)vaddr & PGOFSET);
if (buflen < sgsize)
sgsize = buflen;
/*
* Insert chunk into a segment, coalescing with
* previous segment if possible.
*/
if (first) {
map->dm_segs[seg].ds_addr = curaddr;
map->dm_segs[seg].ds_len = sgsize;
first = 0;
} else {
if (curaddr == lastaddr &&
(map->dm_segs[seg].ds_len + sgsize) <=
map->_dm_maxsegsz)
map->dm_segs[seg].ds_len += sgsize;
else {
seg++;
map->dm_segs[seg].ds_addr = curaddr;
map->dm_segs[seg].ds_len = sgsize;
}
}
lastaddr = curaddr + sgsize;
vaddr += sgsize;
buflen -= sgsize;
}
*segp = seg;
*lastaddrp = lastaddr;
/*
* Did we fit?
*/
if (buflen != 0)
return (EFBIG); /* XXX better return value here? */
return (0);
}
/*
* Allocate physical memory from the given physical address range.
* Called by DMA-safe memory allocation methods.
*/
int
_bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs,
flags, low, high)
bus_dma_tag_t t;
bus_size_t size, alignment, boundary;
bus_dma_segment_t *segs;
int nsegs;
int *rsegs;
int flags;
vm_offset_t low;
vm_offset_t high;
{
vm_offset_t curaddr, lastaddr;
vm_page_t m;
struct pglist mlist;
int curseg, error;
/* Always round the size. */
size = round_page(size);
/*
* Allocate pages from the VM system.
*/
TAILQ_INIT(&mlist);
#if defined(UVM)
error = uvm_pglistalloc(size, low, high, alignment, boundary,
&mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
#else
error = vm_page_alloc_memory(size, low, high,
alignment, boundary, &mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
#endif
if (error)
return (error);
/*
* Compute the location, size, and number of segments actually
* returned by the VM code.
*/
m = mlist.tqh_first;
curseg = 0;
lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
segs[curseg].ds_len = PAGE_SIZE;
m = m->pageq.tqe_next;
for (; m != NULL; m = m->pageq.tqe_next) {
curaddr = VM_PAGE_TO_PHYS(m);
#ifdef DIAGNOSTIC
if (curaddr < low || curaddr >= high) {
printf("vm_page_alloc_memory returned non-sensical"
" address 0x%lx\n", curaddr);
panic("_bus_dmamem_alloc_range");
}
#endif
if (curaddr == (lastaddr + PAGE_SIZE))
segs[curseg].ds_len += PAGE_SIZE;
else {
curseg++;
segs[curseg].ds_addr = curaddr;
segs[curseg].ds_len = PAGE_SIZE;
}
lastaddr = curaddr;
}
*rsegs = curseg + 1;
return (0);
}
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