![Shaohua Li](/assets/img/avatar_default.png)
ACPI defines a hardware signature. BIOS calculates the signature according to hardware configure and if hardware changes while hibernated, the signature will change. In that case, S4 resume should fail. Still, there may be systems on which this mechanism does not work correctly, so it is better to provide a workaround for them. For this reason, add a new switch to the acpi_sleep= command line argument allowing one to disable hardware signature checking. [shaohua.li@intel.com: build fix] Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Andi Kleen <andi@firstfloor.org> Cc: Len Brown <lenb@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: <Valdis.Kletnieks@vt.edu> Cc: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*
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* sleep.c - x86-specific ACPI sleep support.
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*
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* Copyright (C) 2001-2003 Patrick Mochel
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* Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
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*/
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#include <linux/acpi.h>
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#include <linux/bootmem.h>
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#include <linux/dmi.h>
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#include <linux/cpumask.h>
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#include <asm/segment.h>
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#include "realmode/wakeup.h"
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#include "sleep.h"
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unsigned long acpi_wakeup_address;
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unsigned long acpi_realmode_flags;
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/* address in low memory of the wakeup routine. */
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static unsigned long acpi_realmode;
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#ifdef CONFIG_64BIT
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static char temp_stack[10240];
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#endif
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/**
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* acpi_save_state_mem - save kernel state
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*
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* Create an identity mapped page table and copy the wakeup routine to
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* low memory.
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*
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* Note that this is too late to change acpi_wakeup_address.
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*/
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int acpi_save_state_mem(void)
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{
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struct wakeup_header *header;
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if (!acpi_realmode) {
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printk(KERN_ERR "Could not allocate memory during boot, "
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"S3 disabled\n");
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return -ENOMEM;
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}
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memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
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header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
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if (header->signature != 0x51ee1111) {
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printk(KERN_ERR "wakeup header does not match\n");
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return -EINVAL;
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}
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header->video_mode = saved_video_mode;
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header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
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/*
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* Set up the wakeup GDT. We set these up as Big Real Mode,
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* that is, with limits set to 4 GB. At least the Lenovo
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* Thinkpad X61 is known to need this for the video BIOS
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* initialization quirk to work; this is likely to also
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* be the case for other laptops or integrated video devices.
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*/
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/* GDT[0]: GDT self-pointer */
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header->wakeup_gdt[0] =
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(u64)(sizeof(header->wakeup_gdt) - 1) +
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((u64)(acpi_wakeup_address +
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((char *)&header->wakeup_gdt - (char *)acpi_realmode))
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<< 16);
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/* GDT[1]: big real mode-like code segment */
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header->wakeup_gdt[1] =
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GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
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/* GDT[2]: big real mode-like data segment */
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header->wakeup_gdt[2] =
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GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
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#ifndef CONFIG_64BIT
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store_gdt((struct desc_ptr *)&header->pmode_gdt);
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header->pmode_efer_low = nx_enabled;
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if (header->pmode_efer_low & 1) {
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/* This is strange, why not save efer, always? */
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rdmsr(MSR_EFER, header->pmode_efer_low,
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header->pmode_efer_high);
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}
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#endif /* !CONFIG_64BIT */
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header->pmode_cr0 = read_cr0();
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header->pmode_cr4 = read_cr4();
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header->realmode_flags = acpi_realmode_flags;
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header->real_magic = 0x12345678;
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#ifndef CONFIG_64BIT
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header->pmode_entry = (u32)&wakeup_pmode_return;
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header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
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saved_magic = 0x12345678;
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#else /* CONFIG_64BIT */
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header->trampoline_segment = setup_trampoline() >> 4;
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#ifdef CONFIG_SMP
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stack_start.sp = temp_stack + 4096;
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#endif
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initial_code = (unsigned long)wakeup_long64;
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saved_magic = 0x123456789abcdef0;
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#endif /* CONFIG_64BIT */
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return 0;
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}
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/*
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* acpi_restore_state - undo effects of acpi_save_state_mem
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*/
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void acpi_restore_state_mem(void)
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{
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}
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/**
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* acpi_reserve_bootmem - do _very_ early ACPI initialisation
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*
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* We allocate a page from the first 1MB of memory for the wakeup
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* routine for when we come back from a sleep state. The
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* runtime allocator allows specification of <16MB pages, but not
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* <1MB pages.
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*/
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void __init acpi_reserve_bootmem(void)
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{
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if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
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printk(KERN_ERR
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"ACPI: Wakeup code way too big, S3 disabled.\n");
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return;
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}
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acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
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if (!acpi_realmode) {
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printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
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return;
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}
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acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
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}
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static int __init acpi_sleep_setup(char *str)
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{
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while ((str != NULL) && (*str != '\0')) {
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if (strncmp(str, "s3_bios", 7) == 0)
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acpi_realmode_flags |= 1;
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if (strncmp(str, "s3_mode", 7) == 0)
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acpi_realmode_flags |= 2;
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if (strncmp(str, "s3_beep", 7) == 0)
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acpi_realmode_flags |= 4;
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#ifdef CONFIG_HIBERNATION
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if (strncmp(str, "s4_nohwsig", 10) == 0)
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acpi_no_s4_hw_signature();
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#endif
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if (strncmp(str, "old_ordering", 12) == 0)
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acpi_old_suspend_ordering();
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str = strchr(str, ',');
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if (str != NULL)
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str += strspn(str, ", \t");
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}
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return 1;
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}
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__setup("acpi_sleep=", acpi_sleep_setup);
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