x86, acpi: cleanup, temp_stack is used only when CONFIG_SMP is set

[safe/jmp/linux-2.6] / arch / x86 / kernel / acpi / sleep.c

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index a81f468..81e5ab6 100644 (file)
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -9,6 +9,7 @@
 #include <linux/bootmem.h>
 #include <linux/dmi.h>
 #include <linux/cpumask.h>
+#include <asm/segment.h>
 
 #include "realmode/wakeup.h"
 #include "sleep.h"
@@ -19,7 +20,7 @@ unsigned long acpi_realmode_flags;
 /* address in low memory of the wakeup routine. */
 static unsigned long acpi_realmode;
 
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
 static char temp_stack[10240];
 #endif
 
@@ -51,18 +52,27 @@ int acpi_save_state_mem(void)
        header->video_mode = saved_video_mode;
 
        header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
+
+       /*
+        * Set up the wakeup GDT.  We set these up as Big Real Mode,
+        * that is, with limits set to 4 GB.  At least the Lenovo
+        * Thinkpad X61 is known to need this for the video BIOS
+        * initialization quirk to work; this is likely to also
+        * be the case for other laptops or integrated video devices.
+        */
+
        /* GDT[0]: GDT self-pointer */
        header->wakeup_gdt[0] =
                (u64)(sizeof(header->wakeup_gdt) - 1) +
                ((u64)(acpi_wakeup_address +
                        ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
                                << 16);
-       /* GDT[1]: real-mode-like code segment */
-       header->wakeup_gdt[1] = (0x009bULL << 40) +
-               ((u64)acpi_wakeup_address << 16) + 0xffff;
-       /* GDT[2]: real-mode-like data segment */
-       header->wakeup_gdt[2] = (0x0093ULL << 40) +
-               ((u64)acpi_wakeup_address << 16) + 0xffff;
+       /* GDT[1]: big real mode-like code segment */
+       header->wakeup_gdt[1] =
+               GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
+       /* GDT[2]: big real mode-like data segment */
+       header->wakeup_gdt[2] =
+               GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
 
 #ifndef CONFIG_64BIT
        store_gdt((struct desc_ptr *)&header->pmode_gdt);
@@ -86,7 +96,9 @@ int acpi_save_state_mem(void)
        saved_magic = 0x12345678;
 #else /* CONFIG_64BIT */
        header->trampoline_segment = setup_trampoline() >> 4;
+#ifdef CONFIG_SMP
        stack_start.sp = temp_stack + 4096;
+#endif
        initial_code = (unsigned long)wakeup_long64;
        saved_magic = 0x123456789abcdef0;
 #endif /* CONFIG_64BIT */
@@ -138,6 +150,12 @@ static int __init acpi_sleep_setup(char *str)
                        acpi_realmode_flags |= 2;
                if (strncmp(str, "s3_beep", 7) == 0)
                        acpi_realmode_flags |= 4;
+#ifdef CONFIG_HIBERNATION
+               if (strncmp(str, "s4_nohwsig", 10) == 0)
+                       acpi_no_s4_hw_signature();
+#endif
+               if (strncmp(str, "old_ordering", 12) == 0)
+                       acpi_old_suspend_ordering();
                str = strchr(str, ',');
                if (str != NULL)
                        str += strspn(str, ", \t");