diff options
Diffstat (limited to 'arch/x86/kernel/suspend_64.c')
| -rw-r--r-- | arch/x86/kernel/suspend_64.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/arch/x86/kernel/suspend_64.c b/arch/x86/kernel/suspend_64.c index 2e5efaaf8800..09199511c256 100644 --- a/arch/x86/kernel/suspend_64.c +++ b/arch/x86/kernel/suspend_64.c @@ -17,9 +17,26 @@ /* References to section boundaries */ extern const void __nosave_begin, __nosave_end; +static void fix_processor_context(void); + struct saved_context saved_context; -void __save_processor_state(struct saved_context *ctxt) +/** + * __save_processor_state - save CPU registers before creating a + * hibernation image and before restoring the memory state from it + * @ctxt - structure to store the registers contents in + * + * NOTE: If there is a CPU register the modification of which by the + * boot kernel (ie. the kernel used for loading the hibernation image) + * might affect the operations of the restored target kernel (ie. the one + * saved in the hibernation image), then its contents must be saved by this + * function. In other words, if kernel A is hibernated and different + * kernel B is used for loading the hibernation image into memory, the + * kernel A's __save_processor_state() function must save all registers + * needed by kernel A, so that it can operate correctly after the resume + * regardless of what kernel B does in the meantime. + */ +static void __save_processor_state(struct saved_context *ctxt) { kernel_fpu_begin(); @@ -69,7 +86,12 @@ static void do_fpu_end(void) kernel_fpu_end(); } -void __restore_processor_state(struct saved_context *ctxt) +/** + * __restore_processor_state - restore the contents of CPU registers saved + * by __save_processor_state() + * @ctxt - structure to load the registers contents from + */ +static void __restore_processor_state(struct saved_context *ctxt) { /* * control registers @@ -113,14 +135,14 @@ void restore_processor_state(void) __restore_processor_state(&saved_context); } -void fix_processor_context(void) +static 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 necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */ - cpu_gdt(cpu)[GDT_ENTRY_TSS].type = 9; + get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS].type = 9; syscall_init(); /* This sets MSR_*STAR and related */ load_TR_desc(); /* This does ltr */ |