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/kernel.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/spinlock.h>
16 #include <linux/poll.h>
17 #include <linux/delay.h>
18 #include <linux/sysrq.h>
19 #include <linux/proc_fs.h>
20 #include <linux/irq.h>
22 #include <linux/device.h>
23 #include <linux/suspend.h>
24 #include <linux/acpi.h>
25 #include <asm/uaccess.h>
27 #include <asm/tlbflush.h>
29 static struct saved_context saved_context;
30 static void fix_processor_context(void);
32 unsigned long saved_context_eax, saved_context_ebx;
33 unsigned long saved_context_ecx, saved_context_edx;
34 unsigned long saved_context_esp, saved_context_ebp;
35 unsigned long saved_context_esi, saved_context_edi;
36 unsigned long saved_context_eflags;
38 extern void enable_sep_cpu(void *);
40 void save_processor_state(void)
47 asm volatile ("sgdt %0" : "=m" (saved_context.gdt_limit));
48 asm volatile ("sidt %0" : "=m" (saved_context.idt_limit));
49 asm volatile ("sldt %0" : "=m" (saved_context.ldt));
50 asm volatile ("str %0" : "=m" (saved_context.tr));
55 asm volatile ("movw %%es, %0" : "=m" (saved_context.es));
56 asm volatile ("movw %%fs, %0" : "=m" (saved_context.fs));
57 asm volatile ("movw %%gs, %0" : "=m" (saved_context.gs));
58 asm volatile ("movw %%ss, %0" : "=m" (saved_context.ss));
63 asm volatile ("movl %%cr0, %0" : "=r" (saved_context.cr0));
64 asm volatile ("movl %%cr2, %0" : "=r" (saved_context.cr2));
65 asm volatile ("movl %%cr3, %0" : "=r" (saved_context.cr3));
66 asm volatile ("movl %%cr4, %0" : "=r" (saved_context.cr4));
72 /* restore FPU regs if necessary */
73 /* Do it out of line so that gcc does not move cr0 load to some stupid place */
75 mxcsr_feature_mask_init();
78 void restore_processor_state(void)
84 asm volatile ("movl %0, %%cr4" :: "r" (saved_context.cr4));
85 asm volatile ("movl %0, %%cr3" :: "r" (saved_context.cr3));
86 asm volatile ("movl %0, %%cr2" :: "r" (saved_context.cr2));
87 asm volatile ("movl %0, %%cr0" :: "r" (saved_context.cr0));
92 asm volatile ("movw %0, %%es" :: "r" (saved_context.es));
93 asm volatile ("movw %0, %%fs" :: "r" (saved_context.fs));
94 asm volatile ("movw %0, %%gs" :: "r" (saved_context.gs));
95 asm volatile ("movw %0, %%ss" :: "r" (saved_context.ss));
98 * now restore the descriptor tables to their proper values
99 * ltr is done i fix_processor_context().
101 asm volatile ("lgdt %0" :: "m" (saved_context.gdt_limit));
102 asm volatile ("lidt %0" :: "m" (saved_context.idt_limit));
103 asm volatile ("lldt %0" :: "m" (saved_context.ldt));
108 if (boot_cpu_has(X86_FEATURE_SEP))
109 enable_sep_cpu(NULL);
111 fix_processor_context();
115 static void fix_processor_context(void)
117 int cpu = smp_processor_id();
118 struct tss_struct * t = init_tss + cpu;
120 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. */
121 cpu_gdt_table[cpu][GDT_ENTRY_TSS].b &= 0xfffffdff;
123 load_TR_desc(); /* This does ltr */
124 load_LDT(¤t->active_mm->context); /* This does lldt */
127 * Now maybe reload the debug registers
129 if (current->thread.debugreg[7]){
130 loaddebug(¤t->thread, 0);
131 loaddebug(¤t->thread, 1);
132 loaddebug(¤t->thread, 2);
133 loaddebug(¤t->thread, 3);
135 loaddebug(¤t->thread, 6);
136 loaddebug(¤t->thread, 7);
141 EXPORT_SYMBOL(save_processor_state);
142 EXPORT_SYMBOL(restore_processor_state);