173 lines
4.5 KiB
C
173 lines
4.5 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 <asm/desc.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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#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
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static char temp_stack[4096];
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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_safe();
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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 + sizeof(temp_stack);
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early_gdt_descr.address =
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(unsigned long)get_cpu_gdt_table(smp_processor_id());
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initial_gs = per_cpu_offset(smp_processor_id());
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#endif
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initial_code = (unsigned long)wakeup_long64;
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saved_magic = 0x123456789abcdef0L;
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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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if (strncmp(str, "s4_nonvs", 8) == 0)
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acpi_s4_no_nvs();
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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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