4d37e7e3fd
i386 inline assembler cleanup. This change encapsulates descriptor and task register management. Also, it is possible to improve assembler generation in two cases; savesegment may store the value in a register instead of a memory location, which allows GCC to optimize stack variables into registers, and MOV MEM, SEG is always a 16-bit write to memory, making the casting in math-emu unnecessary. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
|
|
* Suspend support specific for i386.
|
|
*
|
|
* Distribute under GPLv2
|
|
*
|
|
* Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
|
|
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/device.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/acpi.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/processor.h>
|
|
|
|
static struct saved_context saved_context;
|
|
|
|
unsigned long saved_context_ebx;
|
|
unsigned long saved_context_esp, saved_context_ebp;
|
|
unsigned long saved_context_esi, saved_context_edi;
|
|
unsigned long saved_context_eflags;
|
|
|
|
void __save_processor_state(struct saved_context *ctxt)
|
|
{
|
|
kernel_fpu_begin();
|
|
|
|
/*
|
|
* descriptor tables
|
|
*/
|
|
store_gdt(&ctxt->gdt_limit);
|
|
store_idt(&ctxt->idt_limit);
|
|
store_tr(ctxt->tr);
|
|
|
|
/*
|
|
* segment registers
|
|
*/
|
|
savesegment(es, ctxt->es);
|
|
savesegment(fs, ctxt->fs);
|
|
savesegment(gs, ctxt->gs);
|
|
savesegment(ss, ctxt->ss);
|
|
|
|
/*
|
|
* control registers
|
|
*/
|
|
ctxt->cr0 = read_cr0();
|
|
ctxt->cr2 = read_cr2();
|
|
ctxt->cr3 = read_cr3();
|
|
ctxt->cr4 = read_cr4();
|
|
}
|
|
|
|
void save_processor_state(void)
|
|
{
|
|
__save_processor_state(&saved_context);
|
|
}
|
|
|
|
static void
|
|
do_fpu_end(void)
|
|
{
|
|
/* restore FPU regs if necessary */
|
|
/* Do it out of line so that gcc does not move cr0 load to some stupid place */
|
|
kernel_fpu_end();
|
|
mxcsr_feature_mask_init();
|
|
}
|
|
|
|
|
|
static void fix_processor_context(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
struct tss_struct * t = &per_cpu(init_tss, cpu);
|
|
|
|
set_tss_desc(cpu,t); /* This just modifies memory; should not be necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
|
|
per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_TSS].b &= 0xfffffdff;
|
|
|
|
load_TR_desc(); /* This does ltr */
|
|
load_LDT(¤t->active_mm->context); /* This does lldt */
|
|
|
|
/*
|
|
* Now maybe reload the debug registers
|
|
*/
|
|
if (current->thread.debugreg[7]){
|
|
set_debugreg(current->thread.debugreg[0], 0);
|
|
set_debugreg(current->thread.debugreg[1], 1);
|
|
set_debugreg(current->thread.debugreg[2], 2);
|
|
set_debugreg(current->thread.debugreg[3], 3);
|
|
/* no 4 and 5 */
|
|
set_debugreg(current->thread.debugreg[6], 6);
|
|
set_debugreg(current->thread.debugreg[7], 7);
|
|
}
|
|
|
|
}
|
|
|
|
void __restore_processor_state(struct saved_context *ctxt)
|
|
{
|
|
/*
|
|
* control registers
|
|
*/
|
|
write_cr4(ctxt->cr4);
|
|
write_cr3(ctxt->cr3);
|
|
write_cr2(ctxt->cr2);
|
|
write_cr2(ctxt->cr0);
|
|
|
|
/*
|
|
* now restore the descriptor tables to their proper values
|
|
* ltr is done i fix_processor_context().
|
|
*/
|
|
load_gdt(&ctxt->gdt_limit);
|
|
load_idt(&ctxt->idt_limit);
|
|
|
|
/*
|
|
* segment registers
|
|
*/
|
|
loadsegment(es, ctxt->es);
|
|
loadsegment(fs, ctxt->fs);
|
|
loadsegment(gs, ctxt->gs);
|
|
loadsegment(ss, ctxt->ss);
|
|
|
|
/*
|
|
* sysenter MSRs
|
|
*/
|
|
if (boot_cpu_has(X86_FEATURE_SEP))
|
|
enable_sep_cpu();
|
|
|
|
fix_processor_context();
|
|
do_fpu_end();
|
|
mtrr_ap_init();
|
|
}
|
|
|
|
void restore_processor_state(void)
|
|
{
|
|
__restore_processor_state(&saved_context);
|
|
}
|
|
|
|
/* Needed by apm.c */
|
|
EXPORT_SYMBOL(save_processor_state);
|
|
EXPORT_SYMBOL(restore_processor_state);
|