| /* |
| * sleep.c - x86-specific ACPI sleep support. |
| * |
| * Copyright (C) 2001-2003 Patrick Mochel |
| * Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz> |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/bootmem.h> |
| #include <linux/dmi.h> |
| #include <linux/cpumask.h> |
| |
| #include "realmode/wakeup.h" |
| #include "sleep.h" |
| |
| unsigned long acpi_wakeup_address; |
| unsigned long acpi_realmode_flags; |
| |
| /* address in low memory of the wakeup routine. */ |
| static unsigned long acpi_realmode; |
| |
| #ifdef CONFIG_64BIT |
| static char temp_stack[10240]; |
| #endif |
| |
| /** |
| * acpi_save_state_mem - save kernel state |
| * |
| * Create an identity mapped page table and copy the wakeup routine to |
| * low memory. |
| * |
| * Note that this is too late to change acpi_wakeup_address. |
| */ |
| int acpi_save_state_mem(void) |
| { |
| struct wakeup_header *header; |
| |
| if (!acpi_realmode) { |
| printk(KERN_ERR "Could not allocate memory during boot, " |
| "S3 disabled\n"); |
| return -ENOMEM; |
| } |
| memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); |
| |
| header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); |
| if (header->signature != 0x51ee1111) { |
| printk(KERN_ERR "wakeup header does not match\n"); |
| return -EINVAL; |
| } |
| |
| header->video_mode = saved_video_mode; |
| |
| header->wakeup_jmp_seg = acpi_wakeup_address >> 4; |
| /* GDT[0]: GDT self-pointer */ |
| header->wakeup_gdt[0] = |
| (u64)(sizeof(header->wakeup_gdt) - 1) + |
| ((u64)(acpi_wakeup_address + |
| ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) |
| << 16); |
| /* GDT[1]: real-mode-like code segment */ |
| header->wakeup_gdt[1] = (0x009bULL << 40) + |
| ((u64)acpi_wakeup_address << 16) + 0xffff; |
| /* GDT[2]: real-mode-like data segment */ |
| header->wakeup_gdt[2] = (0x0093ULL << 40) + |
| ((u64)acpi_wakeup_address << 16) + 0xffff; |
| |
| #ifndef CONFIG_64BIT |
| store_gdt((struct desc_ptr *)&header->pmode_gdt); |
| |
| header->pmode_efer_low = nx_enabled; |
| if (header->pmode_efer_low & 1) { |
| /* This is strange, why not save efer, always? */ |
| rdmsr(MSR_EFER, header->pmode_efer_low, |
| header->pmode_efer_high); |
| } |
| #endif /* !CONFIG_64BIT */ |
| |
| header->pmode_cr0 = read_cr0(); |
| header->pmode_cr4 = read_cr4(); |
| header->realmode_flags = acpi_realmode_flags; |
| header->real_magic = 0x12345678; |
| |
| #ifndef CONFIG_64BIT |
| header->pmode_entry = (u32)&wakeup_pmode_return; |
| header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); |
| saved_magic = 0x12345678; |
| #else /* CONFIG_64BIT */ |
| header->trampoline_segment = setup_trampoline() >> 4; |
| init_rsp = (unsigned long)temp_stack + 4096; |
| initial_code = (unsigned long)wakeup_long64; |
| saved_magic = 0x123456789abcdef0; |
| #endif /* CONFIG_64BIT */ |
| |
| return 0; |
| } |
| |
| /* |
| * acpi_restore_state - undo effects of acpi_save_state_mem |
| */ |
| void acpi_restore_state_mem(void) |
| { |
| } |
| |
| |
| /** |
| * acpi_reserve_bootmem - do _very_ early ACPI initialisation |
| * |
| * We allocate a page from the first 1MB of memory for the wakeup |
| * routine for when we come back from a sleep state. The |
| * runtime allocator allows specification of <16MB pages, but not |
| * <1MB pages. |
| */ |
| void __init acpi_reserve_bootmem(void) |
| { |
| if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
| printk(KERN_ERR |
| "ACPI: Wakeup code way too big, S3 disabled.\n"); |
| return; |
| } |
| |
| acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
| |
| if (!acpi_realmode) { |
| printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
| return; |
| } |
| |
| acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); |
| } |
| |
| |
| static int __init acpi_sleep_setup(char *str) |
| { |
| while ((str != NULL) && (*str != '\0')) { |
| if (strncmp(str, "s3_bios", 7) == 0) |
| acpi_realmode_flags |= 1; |
| if (strncmp(str, "s3_mode", 7) == 0) |
| acpi_realmode_flags |= 2; |
| if (strncmp(str, "s3_beep", 7) == 0) |
| acpi_realmode_flags |= 4; |
| str = strchr(str, ','); |
| if (str != NULL) |
| str += strspn(str, ", \t"); |
| } |
| return 1; |
| } |
| |
| __setup("acpi_sleep=", acpi_sleep_setup); |