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>
26 #include <asm/uaccess.h>
28 #include <asm/tlbflush.h>
29 #include <asm/processor.h>
31 static struct saved_context saved_context
;
33 unsigned long saved_context_ebx
;
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 void __save_processor_state(struct saved_context
*ctxt
)
45 store_gdt(&ctxt
->gdt_limit
);
46 store_idt(&ctxt
->idt_limit
);
52 savesegment(es
, ctxt
->es
);
53 savesegment(fs
, ctxt
->fs
);
54 savesegment(gs
, ctxt
->gs
);
55 savesegment(ss
, ctxt
->ss
);
60 ctxt
->cr0
= read_cr0();
61 ctxt
->cr2
= read_cr2();
62 ctxt
->cr3
= read_cr3();
63 ctxt
->cr4
= read_cr4();
66 void save_processor_state(void)
68 __save_processor_state(&saved_context
);
74 /* restore FPU regs if necessary */
75 /* Do it out of line so that gcc does not move cr0 load to some stupid place */
77 mxcsr_feature_mask_init();
81 static void fix_processor_context(void)
83 int cpu
= smp_processor_id();
84 struct tss_struct
* t
= &per_cpu(init_tss
, cpu
);
86 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. */
88 load_TR_desc(); /* This does ltr */
89 load_LDT(¤t
->active_mm
->context
); /* This does lldt */
92 * Now maybe reload the debug registers
94 if (current
->thread
.debugreg
[7]){
95 set_debugreg(current
->thread
.debugreg
[0], 0);
96 set_debugreg(current
->thread
.debugreg
[1], 1);
97 set_debugreg(current
->thread
.debugreg
[2], 2);
98 set_debugreg(current
->thread
.debugreg
[3], 3);
100 set_debugreg(current
->thread
.debugreg
[6], 6);
101 set_debugreg(current
->thread
.debugreg
[7], 7);
106 void __restore_processor_state(struct saved_context
*ctxt
)
111 write_cr4(ctxt
->cr4
);
112 write_cr3(ctxt
->cr3
);
113 write_cr2(ctxt
->cr2
);
114 write_cr2(ctxt
->cr0
);
117 * now restore the descriptor tables to their proper values
118 * ltr is done i fix_processor_context().
120 load_gdt(&ctxt
->gdt_limit
);
121 load_idt(&ctxt
->idt_limit
);
126 loadsegment(es
, ctxt
->es
);
127 loadsegment(fs
, ctxt
->fs
);
128 loadsegment(gs
, ctxt
->gs
);
129 loadsegment(ss
, ctxt
->ss
);
134 if (boot_cpu_has(X86_FEATURE_SEP
))
137 fix_processor_context();
142 void restore_processor_state(void)
144 __restore_processor_state(&saved_context
);
147 /* Needed by apm.c */
148 EXPORT_SYMBOL(save_processor_state
);
149 EXPORT_SYMBOL(restore_processor_state
);