2 * Suspend support specific for i386.
4 * Distribute under GPLv2
6 * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
7 * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
10 #include <linux/config.h>
11 #include <linux/smp.h>
12 #include <linux/suspend.h>
13 #include <asm/proto.h>
15 struct saved_context saved_context;
17 unsigned long saved_context_eax, saved_context_ebx, saved_context_ecx, saved_context_edx;
18 unsigned long saved_context_esp, saved_context_ebp, saved_context_esi, saved_context_edi;
19 unsigned long saved_context_r08, saved_context_r09, saved_context_r10, saved_context_r11;
20 unsigned long saved_context_r12, saved_context_r13, saved_context_r14, saved_context_r15;
21 unsigned long saved_context_eflags;
23 void __save_processor_state(struct saved_context *ctxt)
30 asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
31 asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
32 asm volatile ("str %0" : "=m" (ctxt->tr));
34 /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
35 /* EFER should be constant for kernel version, no need to handle it. */
39 asm volatile ("movw %%ds, %0" : "=m" (ctxt->ds));
40 asm volatile ("movw %%es, %0" : "=m" (ctxt->es));
41 asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs));
42 asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs));
43 asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss));
45 rdmsrl(MSR_FS_BASE, ctxt->fs_base);
46 rdmsrl(MSR_GS_BASE, ctxt->gs_base);
47 rdmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
52 asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0));
53 asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2));
54 asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3));
55 asm volatile ("movq %%cr4, %0" : "=r" (ctxt->cr4));
56 asm volatile ("movq %%cr8, %0" : "=r" (ctxt->cr8));
59 void save_processor_state(void)
61 __save_processor_state(&saved_context);
67 /* restore FPU regs if necessary */
68 /* Do it out of line so that gcc does not move cr0 load to some stupid place */
70 mxcsr_feature_mask_init();
73 void __restore_processor_state(struct saved_context *ctxt)
78 asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8));
79 asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4));
80 asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3));
81 asm volatile ("movq %0, %%cr2" :: "r" (ctxt->cr2));
82 asm volatile ("movq %0, %%cr0" :: "r" (ctxt->cr0));
85 * now restore the descriptor tables to their proper values
86 * ltr is done i fix_processor_context().
88 asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
89 asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
94 asm volatile ("movw %0, %%ds" :: "r" (ctxt->ds));
95 asm volatile ("movw %0, %%es" :: "r" (ctxt->es));
96 asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs));
97 load_gs_index(ctxt->gs);
98 asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss));
100 wrmsrl(MSR_FS_BASE, ctxt->fs_base);
101 wrmsrl(MSR_GS_BASE, ctxt->gs_base);
102 wrmsrl(MSR_KERNEL_GS_BASE, ctxt->gs_kernel_base);
104 fix_processor_context();
110 void restore_processor_state(void)
112 __restore_processor_state(&saved_context);
115 void fix_processor_context(void)
117 int cpu = smp_processor_id();
118 struct tss_struct *t = &per_cpu(init_tss, cpu);
120 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. */
122 cpu_gdt_table[cpu][GDT_ENTRY_TSS].type = 9;
124 syscall_init(); /* This sets MSR_*STAR and related */
125 load_TR_desc(); /* This does ltr */
126 load_LDT(¤t->active_mm->context); /* This does lldt */
129 * Now maybe reload the debug registers
131 if (current->thread.debugreg7){
132 loaddebug(¤t->thread, 0);
133 loaddebug(¤t->thread, 1);
134 loaddebug(¤t->thread, 2);
135 loaddebug(¤t->thread, 3);
137 loaddebug(¤t->thread, 6);
138 loaddebug(¤t->thread, 7);