blob: 713e02b97395f456b329c90fc37a3328609b6a80 [file] [log] [blame]
/*
* Suspend support specific for i386.
*
* Distribute under GPLv2
*
* Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
*
* AK currently useless for 24 because the core ACPI code doesn't support S3.
* and most of the infrastructure is missing.
*/
#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 <asm/uaccess.h>
#include <asm/acpi.h>
#include <asm/io.h>
#include <asm/proto.h>
#include <asm/i387.h>
#include <asm/desc.h>
void fix_processor_context(void);
/* Image of the saved processor state. If you touch this, fix acpi_wakeup.S. */
struct saved_context {
u16 ds, es, fs, gs, ss;
unsigned long gs_base, gs_kernel_base, fs_base;
unsigned long cr0, cr2, cr3, cr4;
u16 gdt_pad;
u16 gdt_limit;
unsigned long gdt_base;
u16 idt_pad;
u16 idt_limit;
unsigned long idt_base;
u16 ldt;
u16 tss;
unsigned long tr;
unsigned long safety;
unsigned long return_address;
unsigned long eflags;
} __attribute__((packed));
struct saved_context saved_context;
unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
unsigned long saved_context_esp, saved_context_ebp, saved_context_esi, saved_context_edi;
unsigned long saved_context_r08, saved_context_r09, saved_context_r10, saved_context_r11;
unsigned long saved_context_r12, saved_context_r13, saved_context_r14, saved_context_r15;
unsigned long saved_context_eflags;
void save_processor_state (void)
{
kernel_fpu_begin();
/*
* descriptor tables
*/
asm volatile ("sgdt %0" : "=m" (saved_context.gdt_limit));
asm volatile ("sidt %0" : "=m" (saved_context.idt_limit));
asm volatile ("sldt %0" : "=m" (saved_context.ldt));
asm volatile ("str %0" : "=m" (saved_context.tr));
/* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
/* EFER should be constant for kernel version, no need to handle it. */
/*
* segment registers
*/
asm volatile ("movw %%ds, %0" : "=m" (saved_context.ds));
asm volatile ("movw %%es, %0" : "=m" (saved_context.es));
asm volatile ("movw %%fs, %0" : "=m" (saved_context.fs));
asm volatile ("movw %%gs, %0" : "=m" (saved_context.gs));
asm volatile ("movw %%ss, %0" : "=m" (saved_context.ss));
rdmsrl(MSR_FS_BASE, saved_context.fs_base);
rdmsrl(MSR_GS_BASE, saved_context.gs_base);
rdmsrl(MSR_KERNEL_GS_BASE, saved_context.gs_kernel_base);
/*
* control registers
*/
asm volatile ("movq %%cr0, %0" : "=r" (saved_context.cr0));
asm volatile ("movq %%cr2, %0" : "=r" (saved_context.cr2));
asm volatile ("movq %%cr3, %0" : "=r" (saved_context.cr3));
asm volatile ("movq %%cr4, %0" : "=r" (saved_context.cr4));
}
static void
do_fpu_end(void)
{
/* restore FPU regs if necessary */
kernel_fpu_end();
}
void restore_processor_state(void)
{
/*
* control registers
*/
asm volatile ("movq %0, %%cr4" :: "r" (saved_context.cr4));
asm volatile ("movq %0, %%cr3" :: "r" (saved_context.cr3));
asm volatile ("movq %0, %%cr2" :: "r" (saved_context.cr2));
asm volatile ("movq %0, %%cr0" :: "r" (saved_context.cr0));
/*
* segment registers
*/
asm volatile ("movw %0, %%ds" :: "r" (saved_context.ds));
asm volatile ("movw %0, %%es" :: "r" (saved_context.es));
asm volatile ("movw %0, %%fs" :: "r" (saved_context.fs));
load_gs_index(saved_context.gs);
asm volatile ("movw %0, %%ss" :: "r" (saved_context.ss));
wrmsrl(MSR_FS_BASE, saved_context.fs_base);
wrmsrl(MSR_GS_BASE, saved_context.gs_base);
wrmsrl(MSR_KERNEL_GS_BASE, saved_context.gs_kernel_base);
/*
* now restore the descriptor tables to their proper values
* ltr is done i fix_processor_context().
*/
asm volatile ("lgdt %0" :: "m" (saved_context.gdt_limit));
asm volatile ("lidt %0" :: "m" (saved_context.idt_limit));
asm volatile ("lldt %0" :: "m" (saved_context.ldt));
fix_processor_context();
do_fpu_end();
}
#define loaddebug(thread,register) \
set_debug((thread)->debugreg[register], register)
void fix_processor_context(void)
{
int cpu = smp_processor_id();
struct tss_struct * t = init_tss + cpu;
set_tss_desc(cpu,t);
/* clear busy TSS */
gdt_cpu_table[cpu].tss.type = 9;
syscall_init(); /* This sets MSR_*STAR and related */
load_TR(cpu); /* This does ltr */
load_LDT(current->active_mm); /* This does lldt */
/*
* Now maybe reload the debug registers
*/
if (current->thread.debugreg[7]){
loaddebug(&current->thread, 0);
loaddebug(&current->thread, 1);
loaddebug(&current->thread, 2);
loaddebug(&current->thread, 3);
/* no 4 and 5 */
loaddebug(&current->thread, 6);
loaddebug(&current->thread, 7);
}
}