aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/acpi/sleep.c
diff options
context:
space:
mode:
authorPavel Machek <pavel@suse.cz>2008-04-10 23:28:10 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:41:37 +0200
commite44b7b7525ad9d43163ab5e60c784325419e0ea6 (patch)
treee2918917a97b4c9de4367e8778ed78afc762b9f8 /arch/x86/kernel/acpi/sleep.c
parentf49688d459c5eaa62db3597cbfd3cb13e361d415 (diff)
downloadmrst-s0i3-test-e44b7b7525ad9d43163ab5e60c784325419e0ea6.tar.gz
mrst-s0i3-test-e44b7b7525ad9d43163ab5e60c784325419e0ea6.tar.xz
mrst-s0i3-test-e44b7b7525ad9d43163ab5e60c784325419e0ea6.zip
x86: move suspend wakeup code to C
Move wakeup code to .c, so that video mode setting code can be shared between boot and wakeup. Remove nasty assembly code in 64-bit case by re-using trampoline code. Stack setup was fixed to clear high 16bits of %esp, maybe that fixes some machines. .c code sharing and morse code was done H. Peter Anvin, Sam Ravnborg reviewed kbuild related stuff, and it seems okay to him. Rafael did some cleanups. [rjw: * Made the patch stop breaking compilation on x86-32 * Added arch/x86/kernel/acpi/sleep.h * Got rid of compiler warnings in arch/x86/kernel/acpi/sleep.c * Fixed 32-bit compilation on x86-64 systems * Added include/asm-x86/trampoline.h and fixed the non-SMP compilation on 64-bit x86 * Removed arch/x86/kernel/acpi/sleep_32.c which was not used * Fixed some breakage caused by the integration of smpboot.c done under us in the meantime] Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/acpi/sleep.c')
-rw-r--r--arch/x86/kernel/acpi/sleep.c71
1 files changed, 59 insertions, 12 deletions
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index dd78326ae47..afc25ee9964 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -10,30 +10,72 @@
#include <linux/dmi.h>
#include <linux/cpumask.h>
-#include <asm/smp.h>
+#include "realmode/wakeup.h"
+#include "sleep.h"
-/* address in low memory of the wakeup routine. */
unsigned long acpi_wakeup_address;
unsigned long acpi_realmode_flags;
-extern char wakeup_start, wakeup_end;
-extern unsigned long acpi_copy_wakeup_routine(unsigned long);
+/* address in low memory of the wakeup routine. */
+static unsigned long acpi_realmode;
+
+#ifdef CONFIG_64BIT
+static char temp_stack[10240];
+#endif
/**
* acpi_save_state_mem - save kernel state
*
* Create an identity mapped page table and copy the wakeup routine to
* low memory.
+ *
+ * Note that this is too late to change acpi_wakeup_address.
*/
int acpi_save_state_mem(void)
{
- if (!acpi_wakeup_address) {
- printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n");
+ struct wakeup_header *header;
+
+ if (!acpi_realmode) {
+ printk(KERN_ERR "Could not allocate memory during boot, "
+ "S3 disabled\n");
return -ENOMEM;
}
- memcpy((void *)acpi_wakeup_address, &wakeup_start,
- &wakeup_end - &wakeup_start);
- acpi_copy_wakeup_routine(acpi_wakeup_address);
+ memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
+
+ header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
+ if (header->signature != 0x51ee1111) {
+ printk(KERN_ERR "wakeup header does not match\n");
+ return -EINVAL;
+ }
+
+ header->video_mode = saved_video_mode;
+
+#ifndef CONFIG_64BIT
+ store_gdt((struct desc_ptr *)&header->pmode_gdt);
+
+ header->pmode_efer_low = nx_enabled;
+ if (header->pmode_efer_low & 1) {
+ /* This is strange, why not save efer, always? */
+ rdmsr(MSR_EFER, header->pmode_efer_low,
+ header->pmode_efer_high);
+ }
+#endif /* !CONFIG_64BIT */
+
+ header->pmode_cr0 = read_cr0();
+ header->pmode_cr4 = read_cr4();
+ header->realmode_flags = acpi_realmode_flags;
+ header->real_magic = 0x12345678;
+
+#ifndef CONFIG_64BIT
+ header->pmode_entry = (u32)&wakeup_pmode_return;
+ header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
+ saved_magic = 0x12345678;
+#else /* CONFIG_64BIT */
+ header->trampoline_segment = setup_trampoline() >> 4;
+ init_rsp = (unsigned long)temp_stack + 4096;
+ initial_code = (unsigned long)wakeup_long64;
+ saved_magic = 0x123456789abcdef0;
+#endif /* CONFIG_64BIT */
return 0;
}
@@ -56,15 +98,20 @@ void acpi_restore_state_mem(void)
*/
void __init acpi_reserve_bootmem(void)
{
- if ((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) {
+ if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
printk(KERN_ERR
"ACPI: Wakeup code way too big, S3 disabled.\n");
return;
}
- acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
- if (!acpi_wakeup_address)
+ acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
+
+ if (!acpi_realmode) {
printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
+ return;
+ }
+
+ acpi_wakeup_address = acpi_realmode;
}