mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
158 lines
4.4 KiB
C
158 lines
4.4 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 <asm/uaccess.h>
|
|
#include <asm/acpi.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/io.h>
|
|
#include <asm/proto.h>
|
|
|
|
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(struct saved_context *ctxt)
|
|
{
|
|
kernel_fpu_begin();
|
|
|
|
/*
|
|
* descriptor tables
|
|
*/
|
|
asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
|
|
asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
|
|
asm volatile ("sldt %0" : "=m" (ctxt->ldt));
|
|
asm volatile ("str %0" : "=m" (ctxt->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" (ctxt->ds));
|
|
asm volatile ("movw %%es, %0" : "=m" (ctxt->es));
|
|
asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs));
|
|
asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs));
|
|
asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss));
|
|
|
|
rdmsrl(MSR_FS_BASE, ctxt->fs_base);
|
|
rdmsrl(MSR_GS_BASE, ctxt->gs_base);
|
|
rdmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
|
|
|
|
/*
|
|
* control registers
|
|
*/
|
|
asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0));
|
|
asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2));
|
|
asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3));
|
|
asm volatile ("movq %%cr4, %0" : "=r" (ctxt->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();
|
|
}
|
|
|
|
void __restore_processor_state(struct saved_context *ctxt)
|
|
{
|
|
/*
|
|
* control registers
|
|
*/
|
|
asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4));
|
|
asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3));
|
|
asm volatile ("movq %0, %%cr2" :: "r" (ctxt->cr2));
|
|
asm volatile ("movq %0, %%cr0" :: "r" (ctxt->cr0));
|
|
|
|
/*
|
|
* segment registers
|
|
*/
|
|
asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds));
|
|
asm volatile ("movw %0, %%es" :: "r" (ctxt->es));
|
|
asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs));
|
|
load_gs_index(ctxt->gs);
|
|
asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss));
|
|
|
|
wrmsrl(MSR_FS_BASE, ctxt->fs_base);
|
|
wrmsrl(MSR_GS_BASE, ctxt->gs_base);
|
|
wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
|
|
|
|
/*
|
|
* now restore the descriptor tables to their proper values
|
|
* ltr is done i fix_processor_context().
|
|
*/
|
|
asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
|
|
asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
|
|
asm volatile ("lldt %0" :: "m" (ctxt->ldt));
|
|
|
|
fix_processor_context();
|
|
|
|
do_fpu_end();
|
|
}
|
|
|
|
void restore_processor_state(void)
|
|
{
|
|
__restore_processor_state(&saved_context);
|
|
}
|
|
|
|
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 neccessary. But... This is neccessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
|
|
|
|
cpu_gdt_table[cpu][GDT_ENTRY_TSS].type = 9;
|
|
|
|
syscall_init(); /* This sets MSR_*STAR and related */
|
|
load_TR_desc(); /* This does ltr */
|
|
load_LDT(¤t->active_mm->context); /* This does lldt */
|
|
|
|
/*
|
|
* Now maybe reload the debug registers
|
|
*/
|
|
if (current->thread.debugreg7){
|
|
loaddebug(¤t->thread, 0);
|
|
loaddebug(¤t->thread, 1);
|
|
loaddebug(¤t->thread, 2);
|
|
loaddebug(¤t->thread, 3);
|
|
/* no 4 and 5 */
|
|
loaddebug(¤t->thread, 6);
|
|
loaddebug(¤t->thread, 7);
|
|
}
|
|
|
|
}
|
|
|
|
|