1 /* 2 * sleep.c - x86-specific ACPI sleep support. 3 * 4 * Copyright (C) 2001-2003 Patrick Mochel 5 * Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz> 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/bootmem.h> 10 #include <linux/dmi.h> 11 #include <linux/cpumask.h> 12 13 #include <asm/smp.h> 14 15 /* address in low memory of the wakeup routine. */ 16 unsigned long acpi_wakeup_address = 0; 17 unsigned long acpi_realmode_flags; 18 extern char wakeup_start, wakeup_end; 19 20 extern unsigned long acpi_copy_wakeup_routine(unsigned long); 21 22 /** 23 * acpi_save_state_mem - save kernel state 24 * 25 * Create an identity mapped page table and copy the wakeup routine to 26 * low memory. 27 */ 28 int acpi_save_state_mem(void) 29 { 30 if (!acpi_wakeup_address) { 31 printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n"); 32 return -ENOMEM; 33 } 34 memcpy((void *)acpi_wakeup_address, &wakeup_start, 35 &wakeup_end - &wakeup_start); 36 acpi_copy_wakeup_routine(acpi_wakeup_address); 37 38 return 0; 39 } 40 41 /* 42 * acpi_restore_state - undo effects of acpi_save_state_mem 43 */ 44 void acpi_restore_state_mem(void) 45 { 46 } 47 48 49 /** 50 * acpi_reserve_bootmem - do _very_ early ACPI initialisation 51 * 52 * We allocate a page from the first 1MB of memory for the wakeup 53 * routine for when we come back from a sleep state. The 54 * runtime allocator allows specification of <16MB pages, but not 55 * <1MB pages. 56 */ 57 void __init acpi_reserve_bootmem(void) 58 { 59 if ((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) { 60 printk(KERN_ERR 61 "ACPI: Wakeup code way too big, S3 disabled.\n"); 62 return; 63 } 64 65 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2); 66 if (!acpi_wakeup_address) 67 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 68 } 69 70 71 static int __init acpi_sleep_setup(char *str) 72 { 73 while ((str != NULL) && (*str != '\0')) { 74 if (strncmp(str, "s3_bios", 7) == 0) 75 acpi_realmode_flags |= 1; 76 if (strncmp(str, "s3_mode", 7) == 0) 77 acpi_realmode_flags |= 2; 78 if (strncmp(str, "s3_beep", 7) == 0) 79 acpi_realmode_flags |= 4; 80 str = strchr(str, ','); 81 if (str != NULL) 82 str += strspn(str, ", \t"); 83 } 84 return 1; 85 } 86 87 __setup("acpi_sleep=", acpi_sleep_setup); 88