File: [cvs.NetBSD.org] / src / sys / arch / i386 / i386 / machdep.c (download)
Revision 1.198, Thu Apr 18 08:36:25 1996 UTC (28 years ago) by mycroft
Branch: MAIN
Changes since 1.197: +2 -2
lines
Turn off the alignment check flag when entering a signal handler.
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/* $NetBSD: machdep.c,v 1.198 1996/04/18 08:36:25 mycroft Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995, 1996 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 <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/sysctl.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
#include <dev/cons.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.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 <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 VM86
#include <machine/vm86.h>
#endif
#include "isa.h"
#include "npx.h"
#if NNPX > 0
extern struct proc *npxproc;
#endif
/* the following is used externally (sysctl_hw) */
char machine[] = "i386"; /* cpu "architecture" */
/*
* 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;
struct msgbuf *msgbufp;
int msgbufmapped;
vm_map_t buffer_map;
extern vm_offset_t avail_start, avail_end;
static vm_offset_t hole_start, hole_end;
static vm_offset_t avail_next;
void identifycpu __P((void));
caddr_t allocsys __P((caddr_t));
void dumpsys __P((void));
void cpu_reset __P((void));
/*
* 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;
/*
* Initialize error message buffer (at end of core).
*/
/* avail_end was pre-decremented in pmap_bootstrap to compensate */
for (i = 0; i < btoc(sizeof(struct msgbuf)); i++)
pmap_enter(pmap_kernel(),
(vm_offset_t)((caddr_t)msgbufp + i * NBPG),
avail_end + i * NBPG, VM_PROT_ALL, TRUE);
msgbufmapped = 1;
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 ((v = (caddr_t)kmem_alloc(kernel_map, round_page(sz))) == 0)
panic("startup: no room for tables");
if (allocsys(v) - v != sz)
panic("startup: table size inconsistency");
/*
* Now allocate buffers proper. They are different than the above
* in that they usually occupy more virtual memory than physical.
*/
size = MAXBSIZE * nbuf;
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");
if ((bufpages / nbuf) >= btoc(MAXBSIZE)) {
/* don't want to alloc more physical mem than needed */
bufpages = btoc(MAXBSIZE) * nbuf;
}
base = bufpages / nbuf;
residual = bufpages % nbuf;
for (i = 0; i < nbuf; i++) {
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);
}
/*
* Allocate a submap for exec arguments. This map effectively
* limits the number of processes exec'ing at any time.
*/
exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
16*NCARGS, TRUE);
/*
* Allocate a submap for physio
*/
phys_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
VM_PHYS_SIZE, TRUE);
/*
* Finally, allocate mbuf pool. Since mclrefcnt is an off-size
* we use the more space efficient malloc in place of kmem_alloc.
*/
mclrefcnt = (char *)malloc(NMBCLUSTERS+CLBYTES/MCLBYTES,
M_MBUF, M_NOWAIT);
bzero(mclrefcnt, NMBCLUSTERS+CLBYTES/MCLBYTES);
mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr,
VM_MBUF_SIZE, FALSE);
/*
* Initialize callouts
*/
callfree = callout;
for (i = 1; i < ncallout; i++)
callout[i-1].c_next = &callout[i];
printf("avail mem = %d\n", ptoa(cnt.v_free_count));
printf("using %d buffers containing %d bytes of memory\n",
nbuf, bufpages * CLBYTES);
/*
* Set up buffers, so they can be used to read disk labels.
*/
bufinit();
/*
* Configure the system.
*/
configure();
/*
* Set up proc0's TSS and LDT.
*/
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);
valloc(swapmap, struct map, nswapmap = maxproc * 2);
#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;
}
if (nswbuf == 0) {
nswbuf = (nbuf / 2) &~ 1; /* force even */
if (nswbuf > 256)
nswbuf = 256; /* sanity */
}
valloc(swbuf, struct buf, nswbuf);
valloc(buf, struct buf, nbuf);
return v;
}
/*
* Info for CTL_HW
*/
char cpu_model[120];
extern char version[];
struct cpu_nameclass i386_cpus[] = {
{ "i386SX", CPUCLASS_386 }, /* CPU_386SX */
{ "i386DX", CPUCLASS_386 }, /* CPU_386 */
{ "i486SX", CPUCLASS_486 }, /* CPU_486SX */
{ "i486DX", CPUCLASS_486 }, /* CPU_486 */
{ "Pentium", CPUCLASS_586 }, /* CPU_586 */
{ "Cx486DLC", CPUCLASS_486 }, /* CPU_486DLC (Cyrix) */
};
void
identifycpu()
{
int len;
extern char cpu_vendor[];
printf("CPU: ");
#ifdef DIAGNOSTIC
if (cpu < 0 || cpu >= (sizeof i386_cpus/sizeof(struct cpu_nameclass)))
panic("unknown cpu type %d\n", cpu);
#endif
sprintf(cpu_model, "%s (", i386_cpus[cpu].cpu_name);
if (cpu_vendor[0] != '\0') {
strcat(cpu_model, cpu_vendor);
strcat(cpu_model, " ");
}
cpu_class = i386_cpus[cpu].cpu_class;
switch(cpu_class) {
case CPUCLASS_386:
strcat(cpu_model, "386");
break;
case CPUCLASS_486:
strcat(cpu_model, "486");
break;
case CPUCLASS_586:
strcat(cpu_model, "586");
break;
default:
strcat(cpu_model, "unknown"); /* will panic below... */
break;
}
strcat(cpu_model, "-class CPU)");
printf("%s\n", cpu_model); /* cpu speed would be nice, but how? */
/*
* 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)
#error No CPU classes configured.
#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;
}
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)
/*
* On a 486 or above, enable ring 0 write protection and outer ring
* alignment checking.
*/
if (cpu_class >= CPUCLASS_486)
lcr0(rcr0() | CR0_WP | CR0_AM);
#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;
/* 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));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
#ifdef COMPAT_IBCS2
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
boot(howto)
int howto;
{
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) {
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 configure 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
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 = 0;
int c;
/* 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)
dumpconf();
if (dumplo < 0)
return;
printf("\ndumping to dev %x, offset %d\n", 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;
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 */
}
#ifdef HZ
/*
* If HZ is defined we use this code, otherwise the code in
* /sys/i386/i386/microtime.s is used. The other code only works
* for HZ=100.
*/
void
microtime(tvp)
register struct timeval *tvp;
{
int s = splhigh();
*tvp = time;
tvp->tv_usec += tick;
splx(s);
while (tvp->tv_usec > 1000000) {
tvp->tv_sec++;
tvp->tv_usec -= 1000000;
}
}
#endif /* HZ */
/*
* Clear registers on exec
*/
void
setregs(p, pack, stack, retval)
struct proc *p;
struct exec_package *pack;
u_long stack;
register_t *retval;
{
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;
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_ebp = 0;
tf->tf_ebx = (int)PS_STRINGS;
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);
retval[1] = 0;
}
/*
* Initialize segments and descriptor tables
*/
union descriptor gdt[NGDT];
union descriptor ldt[NLDT];
struct gate_descriptor idt[NIDT];
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(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt),
IDTVEC(ofl), IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna),
IDTVEC(dble), IDTVEC(fpusegm), IDTVEC(tss), IDTVEC(missing),
IDTVEC(stk), IDTVEC(prot), IDTVEC(page), IDTVEC(rsvd),
IDTVEC(fpu), IDTVEC(align),
IDTVEC(syscall), IDTVEC(osyscall);
void
init386(first_avail)
vm_offset_t first_avail;
{
int x;
unsigned biosbasemem, biosextmem;
struct region_descriptor region;
extern char etext[], sigcode[], esigcode[];
extern void consinit __P((void));
extern void lgdt();
proc0.p_addr = proc0paddr;
consinit(); /* XXX SHOULD NOT BE DONE HERE */
/* 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, sizeof(ldt) - 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);
/* 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 < NIDT; x++)
setgate(&idt[x], &IDTVEC(rsvd), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 0], &IDTVEC(div), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 1], &IDTVEC(dbg), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 2], &IDTVEC(nmi), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 3], &IDTVEC(bpt), 0, SDT_SYS386TGT, SEL_UPL);
setgate(&idt[ 4], &IDTVEC(ofl), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 5], &IDTVEC(bnd), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 6], &IDTVEC(ill), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 7], &IDTVEC(dna), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 8], &IDTVEC(dble), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 9], &IDTVEC(fpusegm), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 10], &IDTVEC(tss), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 11], &IDTVEC(missing), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 12], &IDTVEC(stk), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 13], &IDTVEC(prot), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 14], &IDTVEC(page), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 16], &IDTVEC(fpu), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[ 17], &IDTVEC(align), 0, SDT_SYS386TGT, SEL_KPL);
setgate(&idt[128], &IDTVEC(syscall), 0, SDT_SYS386TGT, SEL_UPL);
setregion(®ion, gdt, sizeof(gdt) - 1);
lgdt(®ion);
setregion(®ion, idt, sizeof(idt) - 1);
lidt(®ion);
#if NISA > 0
isa_defaultirq();
#endif
splhigh();
enable_intr();
/*
* Use BIOS values stored in RTC CMOS RAM, since probing
* breaks certain 386 AT relics.
*
* XXX Not only does probing break certain 386 AT relics, but
* not all BIOSes (Dell, Compaq, others) report the correct
* amount of extended memory.
*/
biosbasemem = (mc146818_read(NULL, NVRAM_BASEHI) << 8) |
mc146818_read(NULL, NVRAM_BASELO);
#ifdef EXTMEM_SIZE
biosextmem = EXTMEM_SIZE;
#else
biosextmem = (mc146818_read(NULL, NVRAM_EXTHI) << 8) |
mc146818_read(NULL, NVRAM_EXTLO);
#endif /* EXTMEM_SIZE */
/* Round down to whole pages. */
biosbasemem &= -(NBPG / 1024);
biosextmem &= -(NBPG / 1024);
avail_start = NBPG; /* BIOS leaves data in low memory */
/* and VM system doesn't work with phys 0 */
avail_end = biosextmem ? IOM_END + biosextmem * 1024
: biosbasemem * 1024;
/* number of pages of physmem addr space */
physmem = btoc((biosbasemem + biosextmem) * 1024);
dumpmem_low = btoc(biosbasemem * 1024);
dumpmem_high = btoc(biosextmem * 1024);
/*
* Initialize for pmap_free_pages and pmap_next_page.
* These guys should be page-aligned.
*/
hole_start = biosbasemem * 1024;
/* we load right after the I/O hole; adjust hole_end to compensate */
hole_end = round_page(first_avail);
avail_next = avail_start;
if (physmem < btoc(2 * 1024 * 1024)) {
printf("warning: too little memory available; running in degraded mode\n"
"press a key to confirm\n\n");
cngetc();
}
/* call pmap initialization to make new kernel address space */
pmap_bootstrap((vm_offset_t)atdevbase + IOM_SIZE);
#ifdef DDB
ddb_init();
if (boothowto & RB_KDB)
Debugger();
#endif
#ifdef KGDB
if (boothowto & RB_KDB)
kgdb_connect(0);
#endif
}
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 = cpu_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;
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(COMPAT_NOMID) || defined(COMPAT_FREEBSD)
/*
* cpu_exec_aout_prep_oldzmagic():
* Prepare the vmcmds to build a vmspace for an old (386BSD) ZMAGIC
* binary.
*
* Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
* description of operation is there.
*/
int
cpu_exec_aout_prep_oldzmagic(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *execp = epp->ep_hdr;
struct exec_vmcmd *ccmdp;
epp->ep_taddr = 0;
epp->ep_tsize = execp->a_text;
epp->ep_daddr = epp->ep_taddr + execp->a_text;
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
/*
* check if vnode is in open for writing, because we want to
* demand-page out of it. if it is, don't do it, for various
* reasons
*/
if ((execp->a_text != 0 || execp->a_data != 0) &&
epp->ep_vp->v_writecount != 0) {
#ifdef DIAGNOSTIC
if (epp->ep_vp->v_flag & VTEXT)
panic("exec: a VTEXT vnode has writecount != 0\n");
#endif
return ETXTBSY;
}
epp->ep_vp->v_flag |= VTEXT;
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */
VM_PROT_READ|VM_PROT_EXECUTE);
/* set up command for data segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
epp->ep_daddr, epp->ep_vp,
execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
epp->ep_daddr + execp->a_data, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
return exec_aout_setup_stack(p, epp);
}
#endif /* COMPAT_NOMID || COMPAT_FREEBSD */
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;
}
/*
* 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()
{
static int initted;
if (initted)
return;
initted = 1;
cninit();
}
void
cpu_reset()
{
struct region_descriptor region;
/* Toggle the hardware reset line on the keyboard controller. */
outb(KBCMDP, KBC_PULSE0);
delay(20000);
outb(KBCMDP, KBC_PULSE0);
delay(20000);
/*
* Try to cause a triple fault and watchdog reset by setting the
* IDT to point to nothing.
*/
setregion(®ion, 0, 0);
lidt(®ion);
/*
* Try to cause a triple fault and watchdog reset by unmapping the
* entire address space.
*/
bzero((caddr_t)PTD, NBPG);
pmap_update();
for (;;);
}
int
bus_mem_map(t, bpa, size, cacheable, mhp)
bus_chipset_tag_t t;
bus_mem_addr_t bpa;
bus_mem_size_t size;
int cacheable;
bus_mem_handle_t *mhp;
{
u_long pa, endpa;
vm_offset_t va;
pa = i386_trunc_page(bpa);
endpa = i386_round_page(bpa + size);
va = kmem_alloc_pageable(kernel_map, endpa - pa);
if (va == 0)
return (1);
*mhp = (caddr_t)(va + (bpa & PGOFSET));
for (; pa < endpa; pa += NBPG, va += NBPG) {
pmap_enter(pmap_kernel(), va, pa, VM_PROT_READ | VM_PROT_WRITE,
TRUE);
if (!cacheable)
pmap_changebit(pa, PG_N, ~0);
else
pmap_changebit(pa, 0, ~PG_N);
}
return 0;
}
void
bus_mem_unmap(t, memh, size)
bus_chipset_tag_t t;
bus_mem_handle_t memh;
bus_mem_size_t size;
{
vm_offset_t va, endva;
va = i386_trunc_page(memh);
endva = i386_round_page(memh);
kmem_free(kmem_map, va, endva - va);
}
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