mirror of
https://github.com/torvalds/linux
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e44b7b7525
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>
135 lines
3.2 KiB
C
135 lines
3.2 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 "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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#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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init_rsp = (unsigned long)temp_stack + 4096;
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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 = 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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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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