version 1.43.4.8, 2007/01/25 11:27:54 |
version 1.47.6.1, 2007/07/11 20:00:00 |
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/* $NetBSD$ */ |
/* $NetBSD$ */ |
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/*- |
/*- |
* Copyright (c) 1998, 2000, 2004 The NetBSD Foundation, Inc. |
* Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc. |
* All rights reserved. |
* All rights reserved. |
* |
* |
* This code is derived from software contributed to The NetBSD Foundation |
* This code is derived from software contributed to The NetBSD Foundation |
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* @(#)locore.s 7.3 (Berkeley) 5/13/91 |
* @(#)locore.s 7.3 (Berkeley) 5/13/91 |
*/ |
*/ |
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#include "opt_compat_netbsd.h" |
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#include "opt_compat_oldboot.h" |
#include "opt_compat_oldboot.h" |
#include "opt_cputype.h" |
#include "opt_cputype.h" |
#include "opt_ddb.h" |
#include "opt_ddb.h" |
#include "opt_ipkdb.h" |
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#include "opt_lockdebug.h" |
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#include "opt_multiprocessor.h" |
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#include "opt_realmem.h" |
#include "opt_realmem.h" |
#include "opt_user_ldt.h" |
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#include "opt_vm86.h" |
#include "opt_vm86.h" |
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#include "npx.h" |
#include "npx.h" |
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#include <machine/segments.h> |
#include <machine/segments.h> |
#include <machine/specialreg.h> |
#include <machine/specialreg.h> |
#include <machine/trap.h> |
#include <machine/trap.h> |
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#if NLAPIC > 0 |
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#include <machine/i82489reg.h> |
#include <machine/i82489reg.h> |
#endif |
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#include <machine/multiboot.h> |
#include <machine/multiboot.h> |
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/* LINTSTUB: include <sys/types.h> */ |
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/* LINTSTUB: include <machine/cpu.h> */ |
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/* LINTSTUB: include <sys/systm.h> */ |
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#include <machine/asm.h> |
#include <machine/asm.h> |
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#include <machine/frameasm.h> |
#if defined(MULTIPROCESSOR) |
#include <machine/i82489reg.h> |
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#define SET_CURLWP(lwp,cpu) \ |
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movl CPUVAR(SELF),cpu ; \ |
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movl lwp,CPUVAR(CURLWP) ; \ |
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movl cpu,L_CPU(lwp) |
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#else |
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#define SET_CURLWP(lwp,tcpu) movl lwp,CPUVAR(CURLWP) |
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#define GET_CURLWP(reg) movl CPUVAR(CURLWP),reg |
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#endif |
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#define SET_CURPCB(reg) movl reg,CPUVAR(CURPCB) |
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#define CLEAR_RESCHED(reg) movl reg,CPUVAR(RESCHED) |
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/* XXX temporary kluge; these should not be here */ |
/* XXX temporary kluge; these should not be here */ |
/* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */ |
/* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */ |
#include <dev/isa/isareg.h> |
#include <dev/isa/isareg.h> |
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/* Disallow old names for REALBASEMEM */ |
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#ifdef BIOSBASEMEM |
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#error BIOSBASEMEM option deprecated; use REALBASEMEM only if memory size reported by latest boot block is incorrect |
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#endif |
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/* Disallow old names for REALEXTMEM */ |
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#ifdef EXTMEM_SIZE |
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#error EXTMEM_SIZE option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect |
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#endif |
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#ifdef BIOSEXTMEM |
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#error BIOSEXTMEM option deprecated; use REALEXTMEM only if memory size reported by latest boot block is incorrect |
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#endif |
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#include <machine/frameasm.h> |
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#ifdef MULTIPROCESSOR |
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#include <machine/i82489reg.h> |
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#endif |
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/* |
/* |
* Initialization |
* Initialization |
*/ |
*/ |
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.globl _C_LABEL(atdevbase) |
.globl _C_LABEL(atdevbase) |
.globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr) |
.globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr) |
.globl _C_LABEL(gdt) |
.globl _C_LABEL(gdt) |
#ifdef I586_CPU |
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.globl _C_LABEL(idt) |
.globl _C_LABEL(idt) |
#endif |
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.globl _C_LABEL(lapic_tpr) |
.globl _C_LABEL(lapic_tpr) |
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#if NLAPIC > 0 |
#if NLAPIC > 0 |
Line 188 _C_LABEL(lapic_tpr): |
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Line 135 _C_LABEL(lapic_tpr): |
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.long 0 |
.long 0 |
#endif |
#endif |
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_C_LABEL(cpu): .long 0 # are we 80486, Pentium, or.. |
_C_LABEL(cpu): .long 0 # are we 386, 386sx, or 486, |
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# or Pentium, or.. |
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_C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual |
_C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual |
_C_LABEL(proc0uarea): .long 0 |
_C_LABEL(proc0uarea): .long 0 |
_C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm |
_C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm |
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call _C_LABEL(main) |
call _C_LABEL(main) |
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/* |
/* |
* void proc_trampoline(void); |
* void lwp_trampoline(void); |
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* |
* This is a trampoline function pushed onto the stack of a newly created |
* This is a trampoline function pushed onto the stack of a newly created |
* process in order to do some additional setup. The trampoline is entered by |
* process in order to do some additional setup. The trampoline is entered by |
* cpu_switch()ing to the process, so we abuse the callee-saved registers used |
* cpu_switch()ing to the process, so we abuse the callee-saved registers used |
* by cpu_switch() to store the information about the stub to call. |
* by cpu_switch() to store the information about the stub to call. |
* NOTE: This function does not have a normal calling sequence! |
* NOTE: This function does not have a normal calling sequence! |
*/ |
*/ |
/* LINTSTUB: Func: void proc_trampoline(void) */ |
NENTRY(lwp_trampoline) |
NENTRY(proc_trampoline) |
pushl %ebp |
#ifdef MULTIPROCESSOR |
xorl %ebp,%ebp |
call _C_LABEL(proc_trampoline_mp) |
pushl %eax |
#endif |
call _C_LABEL(lwp_startup) |
movl $IPL_NONE,CPUVAR(ILEVEL) |
addl $8,%esp |
pushl %ebx |
pushl %ebx |
call *%esi |
call *%esi |
addl $4,%esp |
addl $4,%esp |
Line 662 NENTRY(proc_trampoline) |
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Line 608 NENTRY(proc_trampoline) |
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INTRFASTEXIT |
INTRFASTEXIT |
/* NOTREACHED */ |
/* NOTREACHED */ |
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/*****************************************************************************/ |
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#ifdef COMPAT_16 |
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/* |
/* |
* Signal trampoline; copied to top of user stack. |
* sigcode() |
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* |
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* Signal trampoline; copied to top of user stack. Used only for |
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* compatibility with old releases of NetBSD. |
*/ |
*/ |
/* LINTSTUB: Var: char sigcode[1], esigcode[1]; */ |
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NENTRY(sigcode) |
NENTRY(sigcode) |
/* |
/* |
* Handler has returned here as if we called it. The sigcontext |
* Handler has returned here as if we called it. The sigcontext |
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int $0x80 # exit if sigreturn fails |
int $0x80 # exit if sigreturn fails |
.globl _C_LABEL(esigcode) |
.globl _C_LABEL(esigcode) |
_C_LABEL(esigcode): |
_C_LABEL(esigcode): |
#endif |
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/*****************************************************************************/ |
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/* |
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* The following is i386-specific nonsense. |
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*/ |
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/* |
/* |
* void lgdt(struct region_descriptor *rdp); |
* void lgdt(struct region_descriptor *rdp); |
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* |
* Load a new GDT pointer (and do any necessary cleanup). |
* Load a new GDT pointer (and do any necessary cleanup). |
* XXX It's somewhat questionable whether reloading all the segment registers |
* XXX It's somewhat questionable whether reloading all the segment registers |
* is necessary, since the actual descriptor data is not changed except by |
* is necessary, since the actual descriptor data is not changed except by |
* process creation and exit, both of which clean up via task switches. OTOH, |
* process creation and exit, both of which clean up via task switches. OTOH, |
* this only happens at run time when the GDT is resized. |
* this only happens at run time when the GDT is resized. |
*/ |
*/ |
/* LINTSTUB: Func: void lgdt(struct region_descriptor *rdp) */ |
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NENTRY(lgdt) |
NENTRY(lgdt) |
/* Reload the descriptor table. */ |
/* Reload the descriptor table. */ |
movl 4(%esp),%eax |
movl 4(%esp),%eax |
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pushl %eax |
pushl %eax |
lret |
lret |
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/* |
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* void x86_flush() |
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* |
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* Flush instruction pipelines by doing an intersegment (far) return. |
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*/ |
NENTRY(x86_flush) |
NENTRY(x86_flush) |
/* Reload code selector by doing intersegment return. */ |
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popl %eax |
popl %eax |
pushl $GSEL(GCODE_SEL, SEL_KPL) |
pushl $GSEL(GCODE_SEL, SEL_KPL) |
pushl %eax |
pushl %eax |
lret |
lret |
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/*****************************************************************************/ |
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/* |
/* |
* These functions are primarily used by DDB. |
* int setjmp(label_t *) |
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* |
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* Used primarily by DDB. |
*/ |
*/ |
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/* LINTSTUB: Func: int setjmp (label_t *l) */ |
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ENTRY(setjmp) |
ENTRY(setjmp) |
movl 4(%esp),%eax |
movl 4(%esp),%eax |
movl %ebx,(%eax) # save ebx |
movl %ebx,(%eax) # save ebx |
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movl %edi,16(%eax) # save edi |
movl %edi,16(%eax) # save edi |
movl (%esp),%edx # get rta |
movl (%esp),%edx # get rta |
movl %edx,20(%eax) # save eip |
movl %edx,20(%eax) # save eip |
xorl %eax,%eax # return (0); |
xorl %eax,%eax # return 0 |
ret |
ret |
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/* LINTSTUB: Func: void longjmp (label_t *l) */ |
/* |
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* int longjmp(label_t *) |
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* |
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* Used primarily by DDB. |
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*/ |
ENTRY(longjmp) |
ENTRY(longjmp) |
movl 4(%esp),%eax |
movl 4(%esp),%eax |
movl (%eax),%ebx # restore ebx |
movl (%eax),%ebx # restore ebx |
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movl 16(%eax),%edi # restore edi |
movl 16(%eax),%edi # restore edi |
movl 20(%eax),%edx # get rta |
movl 20(%eax),%edx # get rta |
movl %edx,(%esp) # put in return frame |
movl %edx,(%esp) # put in return frame |
xorl %eax,%eax # return (1); |
movl $1,%eax # return 1 |
incl %eax |
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ret |
ret |
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/*****************************************************************************/ |
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.globl _C_LABEL(sched_whichqs),_C_LABEL(sched_qs) |
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.globl _C_LABEL(uvmexp),_C_LABEL(panic) |
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#ifdef DIAGNOSTIC |
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NENTRY(switch_error) |
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pushl $1f |
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call _C_LABEL(panic) |
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/* NOTREACHED */ |
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1: .asciz "cpu_switch" |
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#endif /* DIAGNOSTIC */ |
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/* |
/* |
* void cpu_switch(struct lwp *) |
* struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp) |
* Find a runnable lwp and switch to it. Wait if necessary. If the new |
* |
* lwp is the same as the old one, we short-circuit the context save and |
* 1. if (oldlwp != NULL), save its context. |
* restore. |
* 2. then, restore context of newlwp. |
* |
* |
* Note that the stack frame layout is known to "struct switchframe" |
* Note that the stack frame layout is known to "struct switchframe" in |
* in <machine/frame.h> and to the code in cpu_fork() which initializes |
* <machine/frame.h> and to the code in cpu_lwp_fork() which initializes |
* it for a new lwp. |
* it for a new lwp. |
*/ |
*/ |
ENTRY(cpu_switch) |
ENTRY(cpu_switchto) |
pushl %ebx |
pushl %ebx |
pushl %esi |
pushl %esi |
pushl %edi |
pushl %edi |
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#ifdef DEBUG |
movl 16(%esp),%esi # oldlwp |
cmpl $IPL_SCHED,CPUVAR(ILEVEL) |
movl 20(%esp),%edi # newlwp |
jae 1f |
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pushl $2f |
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call _C_LABEL(panic) |
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/* NOTREACHED */ |
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2: .asciz "not splsched() in cpu_switch!" |
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1: |
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#endif /* DEBUG */ |
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movl 16(%esp),%esi # current |
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/* |
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* Clear curlwp so that we don't accumulate system time while idle. |
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* This also insures that schedcpu() will move the old lwp to |
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* the correct queue if it happens to get called from the spllower() |
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* below and changes the priority. (See corresponding comment in |
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* userret()). |
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*/ |
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movl $0,CPUVAR(CURLWP) |
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/* |
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* First phase: find new lwp. |
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* |
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* Registers: |
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* %eax - queue head, scratch, then zero |
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* %ebx - queue number |
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* %ecx - cached value of whichqs |
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* %edx - next lwp in queue |
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* %esi - old lwp |
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* %edi - new lwp |
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*/ |
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/* Look for new lwp. */ |
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cli # splhigh doesn't do a cli |
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movl _C_LABEL(sched_whichqs),%ecx |
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bsfl %ecx,%ebx # find a full q |
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jnz switch_dequeue |
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/* |
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* idling: save old context. |
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* |
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* Registers: |
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* %eax, %ecx - scratch |
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* %esi - old lwp, then old pcb |
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* %edi - idle pcb |
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*/ |
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pushl %esi |
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call _C_LABEL(pmap_deactivate2) # pmap_deactivate(oldproc) |
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addl $4,%esp |
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movl L_ADDR(%esi),%esi |
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/* Save stack pointers. */ |
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movl %esp,PCB_ESP(%esi) |
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movl %ebp,PCB_EBP(%esi) |
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/* Find idle PCB for this CPU */ |
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#ifndef MULTIPROCESSOR |
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movl $_C_LABEL(lwp0),%ebx |
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movl L_ADDR(%ebx),%edi |
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movl L_MD_TSS_SEL(%ebx),%edx |
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#else |
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movl CPUVAR(IDLE_PCB),%edi |
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movl CPUVAR(IDLE_TSS_SEL),%edx |
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#endif |
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movl $0,CPUVAR(CURLWP) /* In case we fault... */ |
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/* Restore the idle context (avoid interrupts) */ |
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cli |
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/* Restore stack pointers. */ |
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movl PCB_ESP(%edi),%esp |
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movl PCB_EBP(%edi),%ebp |
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/* Switch TSS. Reset "task busy" flag before loading. */ |
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movl %cr3,%eax |
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movl %eax,PCB_CR3(%edi) |
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#ifdef MULTIPROCESSOR |
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movl CPUVAR(GDT),%eax |
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#else |
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movl _C_LABEL(gdt),%eax |
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#endif |
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andl $~0x0200,4-SEL_KPL(%eax,%edx,1) |
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ltr %dx |
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/* We're always in the kernel, so we don't need the LDT. */ |
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/* Restore cr0 (including FPU state). */ |
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movl PCB_CR0(%edi),%ecx |
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movl %ecx,%cr0 |
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/* Record new pcb. */ |
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SET_CURPCB(%edi) |
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xorl %esi,%esi |
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sti |
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idle_unlock: |
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#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) || defined(DIAGNOSTIC) |
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call _C_LABEL(sched_unlock_idle) |
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#endif |
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/* Interrupts are okay again. */ |
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pushl $IPL_NONE # spl0() |
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call _C_LABEL(Xspllower) # process pending interrupts |
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addl $4,%esp |
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jmp idle_start |
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idle_zero: |
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sti |
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call _C_LABEL(uvm_pageidlezero) |
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cli |
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cmpl $0,_C_LABEL(sched_whichqs) |
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jnz idle_exit |
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idle_loop: |
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/* Try to zero some pages. */ |
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movl _C_LABEL(uvm)+UVM_PAGE_IDLE_ZERO,%ecx |
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testl %ecx,%ecx |
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jnz idle_zero |
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sti |
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hlt |
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NENTRY(mpidle) |
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idle_start: |
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cli |
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cmpl $0,_C_LABEL(sched_whichqs) |
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jz idle_loop |
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idle_exit: |
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movl $IPL_HIGH,CPUVAR(ILEVEL) # splhigh |
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sti |
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#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) || defined(DIAGNOSTIC) |
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call _C_LABEL(sched_lock_idle) |
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#endif |
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movl _C_LABEL(sched_whichqs),%ecx |
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bsfl %ecx,%ebx |
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jz idle_unlock |
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switch_dequeue: |
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/* |
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* we're running at splhigh(), but it's otherwise okay to take |
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* interrupts here. |
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*/ |
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sti |
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leal _C_LABEL(sched_qs)(,%ebx,8),%eax # select q |
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movl L_FORW(%eax),%edi # unlink from front of process q |
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#ifdef DIAGNOSTIC |
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cmpl %edi,%eax # linked to self (i.e. nothing queued)? |
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je _C_LABEL(switch_error) # not possible |
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#endif /* DIAGNOSTIC */ |
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movl L_FORW(%edi),%edx |
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movl %edx,L_FORW(%eax) |
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movl %eax,L_BACK(%edx) |
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cmpl %edx,%eax # q empty? |
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jne 3f |
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btrl %ebx,%ecx # yes, clear to indicate empty |
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movl %ecx,_C_LABEL(sched_whichqs) # update q status |
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3: /* We just did it. */ |
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xorl %eax,%eax |
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CLEAR_RESCHED(%eax) |
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switch_resume: |
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#ifdef DIAGNOSTIC |
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cmpl %eax,L_WCHAN(%edi) # Waiting for something? |
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jne _C_LABEL(switch_error) # Yes; shouldn't be queued. |
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cmpb $LSRUN,L_STAT(%edi) # In run state? |
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jne _C_LABEL(switch_error) # No; shouldn't be queued. |
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#endif /* DIAGNOSTIC */ |
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/* Isolate lwp. XXX Is this necessary? */ |
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movl %eax,L_BACK(%edi) |
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/* Record new lwp. */ |
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movb $LSONPROC,L_STAT(%edi) # l->l_stat = LSONPROC |
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SET_CURLWP(%edi,%ecx) |
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/* Skip context switch if same lwp. */ |
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xorl %ebx,%ebx |
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cmpl %edi,%esi |
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je switch_return |
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/* If old lwp exited, don't bother. */ |
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testl %esi,%esi |
testl %esi,%esi |
jz switch_exited |
jz 1f |
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/* |
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* Second phase: save old context. |
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* |
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* Registers: |
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* %eax, %ecx - scratch |
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* %esi - old lwp, then old pcb |
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* %edi - new lwp |
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*/ |
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pushl %esi |
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call _C_LABEL(pmap_deactivate2) # pmap_deactivate(oldproc) |
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addl $4,%esp |
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movl L_ADDR(%esi),%esi |
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/* Save stack pointers. */ |
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movl %esp,PCB_ESP(%esi) |
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movl %ebp,PCB_EBP(%esi) |
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switch_exited: |
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/* |
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* Third phase: restore saved context. |
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* |
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* Registers: |
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* %eax, %ebx, %ecx, %edx - scratch |
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* %esi - new pcb |
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* %edi - new lwp |
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*/ |
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/* No interrupts while loading new state. */ |
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cli |
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movl L_ADDR(%edi),%esi |
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/* Restore stack pointers. */ |
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movl PCB_ESP(%esi),%esp |
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movl PCB_EBP(%esi),%ebp |
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#if 0 |
/* Save old context. */ |
/* Don't bother with the rest if switching to a system process. */ |
movl L_ADDR(%esi),%eax |
testl $P_SYSTEM,L_FLAG(%edi); XXX NJWLWP lwp's don't have P_SYSTEM! |
movl %esp,PCB_ESP(%eax) |
jnz switch_restored |
movl %ebp,PCB_EBP(%eax) |
#endif |
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/* Switch to newlwp's stack. */ |
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1: movl L_ADDR(%edi),%ebx |
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movl PCB_EBP(%ebx),%ebp |
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movl PCB_ESP(%ebx),%esp |
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/* Switch TSS. Reset "task busy" flag before loading. */ |
/* Switch TSS. Reset "task busy" flag before loading. */ |
movl %cr3,%eax |
movl %cr3,%eax |
movl %eax,PCB_CR3(%esi) /* XXX should be done by pmap_activate? */ |
movl %eax,PCB_CR3(%ebx) # for TSS gates |
#ifdef MULTIPROCESSOR |
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movl CPUVAR(GDT),%eax |
movl CPUVAR(GDT),%eax |
#else |
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/* Load TSS info. */ |
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movl _C_LABEL(gdt),%eax |
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#endif |
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movl L_MD_TSS_SEL(%edi),%edx |
movl L_MD_TSS_SEL(%edi),%edx |
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andl $~0x0200,4(%eax,%edx, 1) |
andl $~0x0200,4(%eax,%edx, 1) |
ltr %dx |
ltr %dx |
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pushl %edi |
/* Set curlwp. */ |
call _C_LABEL(pmap_activate) # pmap_activate(p) |
movl %edi,CPUVAR(CURLWP) |
addl $4,%esp |
|
|
/* Don't bother with the rest if switching to a system process. */ |
|
testl $LW_SYSTEM,L_FLAG(%edi) |
|
jnz 4f |
|
|
|
/* Is this process using RAS (restartable atomic sequences)? */ |
|
movl L_PROC(%edi),%eax |
|
cmpl $0,P_RASLIST(%eax) |
|
jne 5f |
|
|
|
/* |
|
* Restore cr0 (including FPU state). Raise the IPL to IPL_IPI. |
|
* FPU IPIs can alter the LWP's saved cr0. Dropping the priority |
|
* is deferred until mi_switch(), when cpu_switchto() returns. |
|
*/ |
|
2: movl $IPL_IPI,CPUVAR(ILEVEL) |
|
movl PCB_CR0(%ebx),%ecx |
|
movl %cr0,%edx |
|
|
#if 0 |
|
switch_restored: |
|
#endif |
|
/* Restore cr0 (including FPU state). */ |
|
movl PCB_CR0(%esi),%ecx |
|
#ifdef MULTIPROCESSOR |
|
/* |
/* |
* If our floating point registers are on a different CPU, |
* If our floating point registers are on a different CPU, |
* clear CR0_TS so we'll trap rather than reuse bogus state. |
* set CR0_TS so we'll trap rather than reuse bogus state. |
*/ |
*/ |
movl PCB_FPCPU(%esi),%ebx |
movl PCB_FPCPU(%ebx),%eax |
cmpl CPUVAR(SELF),%ebx |
cmpl CPUVAR(SELF),%eax |
jz 1f |
je 3f |
orl $CR0_TS,%ecx |
orl $CR0_TS,%ecx |
1: |
|
#endif |
|
movl %ecx,%cr0 |
|
|
|
/* Record new pcb. */ |
|
SET_CURPCB(%esi) |
|
|
|
/* Interrupts are okay again. */ |
/* Reloading CR0 is very expensive - avoid if possible. */ |
sti |
3: cmpl %edx,%ecx |
|
je 4f |
/* |
movl %ecx,%cr0 |
* Check for restartable atomic sequences (RAS) |
|
*/ |
|
movl CPUVAR(CURLWP),%edi |
|
movl L_PROC(%edi),%esi |
|
cmpl $0,P_RASLIST(%esi) |
|
jne 2f |
|
1: |
|
movl $1,%ebx |
|
|
|
switch_return: |
|
#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG) || defined(DIAGNOSTIC) |
|
call _C_LABEL(sched_unlock_idle) |
|
#endif |
|
cmpl $0,CPUVAR(IPENDING) |
|
jz 3f |
|
pushl $IPL_NONE # spl0() |
|
call _C_LABEL(Xspllower) # process pending interrupts |
|
addl $4,%esp |
|
3: |
|
movl $IPL_HIGH,CPUVAR(ILEVEL) # splhigh() |
|
|
|
movl %ebx,%eax |
|
|
|
|
/* Return to the new LWP, returning 'oldlwp' in %eax. */ |
|
4: movl %esi,%eax |
popl %edi |
popl %edi |
popl %esi |
popl %esi |
popl %ebx |
popl %ebx |
ret |
ret |
|
|
2: # check RAS list |
/* Check for restartable atomic sequences (RAS). */ |
movl L_MD_REGS(%edi),%ebx |
5: movl L_MD_REGS(%edi),%ecx |
movl TF_EIP(%ebx),%eax |
pushl TF_EIP(%ecx) |
pushl %eax |
pushl %eax |
pushl %esi |
|
call _C_LABEL(ras_lookup) |
call _C_LABEL(ras_lookup) |
addl $8,%esp |
addl $8,%esp |
cmpl $-1,%eax |
cmpl $-1,%eax |
je 1b |
je 2b |
movl %eax,TF_EIP(%ebx) |
movl %eax,TF_EIP(%ebx) |
jmp 1b |
jmp 2b |
|
|
/* |
|
* void cpu_switchto(struct lwp *current, struct lwp *next) |
|
* Switch to the specified next LWP. |
|
*/ |
|
ENTRY(cpu_switchto) |
|
pushl %ebx |
|
pushl %esi |
|
pushl %edi |
|
|
|
#ifdef DEBUG |
|
cmpl $IPL_SCHED,CPUVAR(ILEVEL) |
|
jae 1f |
|
pushl $2f |
|
call _C_LABEL(panic) |
|
/* NOTREACHED */ |
|
2: .asciz "not splsched() in cpu_switchto!" |
|
1: |
|
#endif /* DEBUG */ |
|
|
|
movl 16(%esp),%esi # current |
|
movl 20(%esp),%edi # next |
|
|
|
/* |
|
* Clear curlwp so that we don't accumulate system time while idle. |
|
* This also insures that schedcpu() will move the old process to |
|
* the correct queue if it happens to get called from the spllower() |
|
* below and changes the priority. (See corresponding comment in |
|
* usrret()). |
|
* |
|
* XXX Is this necessary? We know we won't go idle. |
|
*/ |
|
movl $0,CPUVAR(CURLWP) |
|
|
|
/* |
|
* We're running at splhigh(), but it's otherwise okay to take |
|
* interrupts here. |
|
*/ |
|
sti |
|
|
|
/* Jump into the middle of cpu_switch */ |
|
xorl %eax,%eax |
|
jmp switch_resume |
|
|
|
/* |
|
* void cpu_exit(struct lwp *l) |
|
* Switch to the appropriate idle context (lwp0's if uniprocessor; the CPU's |
|
* if multiprocessor) and deallocate the address space and kernel stack for p. |
|
* Then jump into cpu_switch(), as if we were in the idle proc all along. |
|
*/ |
|
#ifndef MULTIPROCESSOR |
|
.globl _C_LABEL(lwp0) |
|
#endif |
|
/* LINTSTUB: Func: void cpu_exit(struct lwp *l) */ |
|
ENTRY(cpu_exit) |
|
movl 4(%esp),%edi # old process |
|
#ifndef MULTIPROCESSOR |
|
movl $_C_LABEL(lwp0),%ebx |
|
movl L_ADDR(%ebx),%esi |
|
movl L_MD_TSS_SEL(%ebx),%edx |
|
#else |
|
movl CPUVAR(IDLE_PCB),%esi |
|
movl CPUVAR(IDLE_TSS_SEL),%edx |
|
#endif |
|
|
|
/* Restore the idle context. */ |
|
cli |
|
|
|
/* Restore stack pointers. */ |
|
movl PCB_ESP(%esi),%esp |
|
movl PCB_EBP(%esi),%ebp |
|
|
|
/* Switch TSS. Reset "task busy" flag before loading. */ |
|
movl %cr3,%eax |
|
movl %eax,PCB_CR3(%esi) |
|
#ifdef MULTIPROCESSOR |
|
movl CPUVAR(GDT),%eax |
|
#else |
|
/* Load TSS info. */ |
|
movl _C_LABEL(gdt),%eax |
|
#endif |
|
|
|
andl $~0x0200,4-SEL_KPL(%eax,%edx,1) |
|
ltr %dx |
|
|
|
/* We're always in the kernel, so we don't need the LDT. */ |
|
|
|
/* Restore cr0 (including FPU state). */ |
|
movl PCB_CR0(%esi),%ecx |
|
movl %ecx,%cr0 |
|
|
|
/* Record new pcb. */ |
|
SET_CURPCB(%esi) |
|
|
|
/* Now off the CPU. */ |
|
movl $0,CPUVAR(CURLWP) |
|
|
|
/* Interrupts are okay again. */ |
|
sti |
|
|
|
/* Jump into cpu_switch() with the right state. */ |
|
xorl %esi,%esi |
|
jmp idle_start |
|
|
|
/* |
/* |
* void savectx(struct pcb *pcb); |
* void savectx(struct pcb *pcb); |
|
* |
* Update pcb, saving current processor state. |
* Update pcb, saving current processor state. |
*/ |
*/ |
/* LINTSTUB: Func: void savectx(struct pcb *pcb) */ |
|
ENTRY(savectx) |
ENTRY(savectx) |
movl 4(%esp),%edx # edx = p->p_addr |
movl 4(%esp),%edx # edx = pcb |
|
|
/* Save stack pointers. */ |
|
movl %esp,PCB_ESP(%edx) |
movl %esp,PCB_ESP(%edx) |
movl %ebp,PCB_EBP(%edx) |
movl %ebp,PCB_EBP(%edx) |
|
|
ret |
ret |
|
|
/* |
/* |
|
* osyscall() |
|
* |
* Old call gate entry for syscall |
* Old call gate entry for syscall |
*/ |
*/ |
/* LINTSTUB: Var: char Xosyscall[1]; */ |
|
IDTVEC(osyscall) |
IDTVEC(osyscall) |
/* Set eflags in trap frame. */ |
pushfl # set eflags in trap frame |
pushfl |
|
popl 8(%esp) |
popl 8(%esp) |
pushl $7 # size of instruction for restart |
pushl $7 # size of instruction for restart |
jmp syscall1 |
jmp syscall1 |
|
|
/* |
/* |
|
* syscall() |
|
* |
* Trap gate entry for syscall |
* Trap gate entry for syscall |
*/ |
*/ |
/* LINTSTUB: Var: char Xsyscall[1]; */ |
|
IDTVEC(syscall) |
IDTVEC(syscall) |
pushl $2 # size of instruction for restart |
pushl $2 # size of instruction for restart |
syscall1: |
syscall1: |
|
|
* latch stuff in probintr() can be moved to npxprobe(). |
* latch stuff in probintr() can be moved to npxprobe(). |
*/ |
*/ |
|
|
/* LINTSTUB: Func: void probeintr(void) */ |
/* |
|
* void probeintr(void) |
|
*/ |
NENTRY(probeintr) |
NENTRY(probeintr) |
ss |
ss |
incl _C_LABEL(npx_intrs_while_probing) |
incl _C_LABEL(npx_intrs_while_probing) |
Line 1319 NENTRY(probeintr) |
|
Line 912 NENTRY(probeintr) |
|
popl %eax |
popl %eax |
iret |
iret |
|
|
/* LINTSTUB: Func: void probetrap(void) */ |
/* |
|
* void probetrap(void) |
|
*/ |
NENTRY(probetrap) |
NENTRY(probetrap) |
ss |
ss |
incl _C_LABEL(npx_traps_while_probing) |
incl _C_LABEL(npx_traps_while_probing) |
fnclex |
fnclex |
iret |
iret |
|
|
/* LINTSTUB: Func: int npx586bug1(int a, int b) */ |
/* |
|
* int npx586bug1(int a, int b) |
|
*/ |
NENTRY(npx586bug1) |
NENTRY(npx586bug1) |
fildl 4(%esp) # x |
fildl 4(%esp) # x |
fildl 8(%esp) # y |
fildl 8(%esp) # y |