94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
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/*
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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 <asm/smp.h>
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#include <asm/tlbflush.h>
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/* address in low memory of the wakeup routine. */
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unsigned long acpi_wakeup_address = 0;
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unsigned long acpi_video_flags;
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extern char wakeup_start, wakeup_end;
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extern void zap_low_mappings(void);
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extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
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static void init_low_mapping(pgd_t *pgd, int pgd_limit)
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{
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int pgd_ofs = 0;
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while ((pgd_ofs < pgd_limit) && (pgd_ofs + USER_PTRS_PER_PGD < PTRS_PER_PGD)) {
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set_pgd(pgd, *(pgd+USER_PTRS_PER_PGD));
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pgd_ofs++, pgd++;
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}
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flush_tlb_all();
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}
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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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int acpi_save_state_mem (void)
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{
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if (!acpi_wakeup_address)
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return 1;
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init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
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memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start);
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acpi_copy_wakeup_routine(acpi_wakeup_address);
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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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zap_low_mappings();
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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_end - &wakeup_start) > PAGE_SIZE) {
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printk(KERN_ERR "ACPI: Wakeup code way too big, S3 disabled.\n");
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return;
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}
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acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
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if (!acpi_wakeup_address)
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printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
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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_video_flags = 1;
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if (strncmp(str, "s3_mode", 7) == 0)
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acpi_video_flags |= 2;
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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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