| /* |
| * sleep.c - x86-specific ACPI sleep support. |
| * |
| * Copyright (C) 2001-2003 Patrick Mochel |
| * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz> |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/bootmem.h> |
| #include <linux/memblock.h> |
| #include <linux/dmi.h> |
| #include <linux/cpumask.h> |
| #include <asm/segment.h> |
| #include <asm/desc.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; |
| |
| #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
| static char temp_stack[4096]; |
| #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; |
| |
| /* |
| * Set up the wakeup GDT. We set these up as Big Real Mode, |
| * that is, with limits set to 4 GB. At least the Lenovo |
| * Thinkpad X61 is known to need this for the video BIOS |
| * initialization quirk to work; this is likely to also |
| * be the case for other laptops or integrated video devices. |
| */ |
| |
| /* 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]: big real mode-like code segment */ |
| header->wakeup_gdt[1] = |
| GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); |
| /* GDT[2]: big real mode-like data segment */ |
| header->wakeup_gdt[2] = |
| GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); |
| |
| #ifndef CONFIG_64BIT |
| store_gdt((struct desc_ptr *)&header->pmode_gdt); |
| |
| if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, |
| &header->pmode_efer_high)) |
| header->pmode_efer_low = header->pmode_efer_high = 0; |
| #endif /* !CONFIG_64BIT */ |
| |
| header->pmode_cr0 = read_cr0(); |
| header->pmode_cr4 = read_cr4_safe(); |
| 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; |
| #ifdef CONFIG_SMP |
| stack_start.sp = temp_stack + sizeof(temp_stack); |
| early_gdt_descr.address = |
| (unsigned long)get_cpu_gdt_table(smp_processor_id()); |
| initial_gs = per_cpu_offset(smp_processor_id()); |
| #endif |
| initial_code = (unsigned long)wakeup_long64; |
| saved_magic = 0x123456789abcdef0L; |
| #endif /* CONFIG_64BIT */ |
| |
| return 0; |
| } |
| |
| /* |
| * acpi_restore_state - undo effects of acpi_save_state_mem |
| */ |
| void acpi_restore_state_mem(void) |
| { |
| } |
| |
| |
| /** |
| * acpi_reserve_wakeup_memory - 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_wakeup_memory(void) |
| { |
| phys_addr_t mem; |
| |
| if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
| printk(KERN_ERR |
| "ACPI: Wakeup code way too big, S3 disabled.\n"); |
| return; |
| } |
| |
| mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE); |
| |
| if (mem == MEMBLOCK_ERROR) { |
| printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
| return; |
| } |
| acpi_realmode = (unsigned long) phys_to_virt(mem); |
| acpi_wakeup_address = mem; |
| memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP"); |
| } |
| |
| |
| 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; |
| #ifdef CONFIG_HIBERNATION |
| if (strncmp(str, "s4_nohwsig", 10) == 0) |
| acpi_no_s4_hw_signature(); |
| if (strncmp(str, "s4_nonvs", 8) == 0) { |
| pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, " |
| "please use acpi_sleep=nonvs instead"); |
| acpi_nvs_nosave(); |
| } |
| #endif |
| if (strncmp(str, "nonvs", 5) == 0) |
| acpi_nvs_nosave(); |
| if (strncmp(str, "old_ordering", 12) == 0) |
| acpi_old_suspend_ordering(); |
| str = strchr(str, ','); |
| if (str != NULL) |
| str += strspn(str, ", \t"); |
| } |
| return 1; |
| } |
| |
| __setup("acpi_sleep=", acpi_sleep_setup); |