Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Common EFI (Extensible Firmware Interface) support functions |
| 3 | * Based on Extensible Firmware Interface Specification version 1.0 |
| 4 | * |
| 5 | * Copyright (C) 1999 VA Linux Systems |
| 6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> |
| 7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. |
| 8 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 9 | * Stephane Eranian <eranian@hpl.hp.com> |
| 10 | * Copyright (C) 2005-2008 Intel Co. |
| 11 | * Fenghua Yu <fenghua.yu@intel.com> |
| 12 | * Bibo Mao <bibo.mao@intel.com> |
| 13 | * Chandramouli Narayanan <mouli@linux.intel.com> |
| 14 | * Huang Ying <ying.huang@intel.com> |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 15 | * Copyright (C) 2013 SuSE Labs |
| 16 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 17 | * |
| 18 | * Copied from efi_32.c to eliminate the duplicated code between EFI |
| 19 | * 32/64 support code. --ying 2007-10-26 |
| 20 | * |
| 21 | * All EFI Runtime Services are not implemented yet as EFI only |
| 22 | * supports physical mode addressing on SoftSDV. This is to be fixed |
| 23 | * in a future version. --drummond 1999-07-20 |
| 24 | * |
| 25 | * Implemented EFI runtime services and virtual mode calls. --davidm |
| 26 | * |
| 27 | * Goutham Rao: <goutham.rao@intel.com> |
| 28 | * Skip non-WB memory and ignore empty memory ranges. |
| 29 | */ |
| 30 | |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 32 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 33 | #include <linux/kernel.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/efi.h> |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 36 | #include <linux/efi-bgrt.h> |
Paul Gortmaker | 69c60c8 | 2011-05-26 12:22:53 -0400 | [diff] [blame] | 37 | #include <linux/export.h> |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 38 | #include <linux/bootmem.h> |
David Howells | 0d01ff2 | 2013-04-11 23:51:01 +0100 | [diff] [blame] | 39 | #include <linux/slab.h> |
Yinghai Lu | a9ce6bc | 2010-08-25 13:39:17 -0700 | [diff] [blame] | 40 | #include <linux/memblock.h> |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 41 | #include <linux/spinlock.h> |
| 42 | #include <linux/uaccess.h> |
| 43 | #include <linux/time.h> |
| 44 | #include <linux/io.h> |
| 45 | #include <linux/reboot.h> |
| 46 | #include <linux/bcd.h> |
| 47 | |
| 48 | #include <asm/setup.h> |
| 49 | #include <asm/efi.h> |
| 50 | #include <asm/time.h> |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 51 | #include <asm/cacheflush.h> |
| 52 | #include <asm/tlbflush.h> |
Feng Tang | 7bd867d | 2009-09-10 10:48:56 +0800 | [diff] [blame] | 53 | #include <asm/x86_init.h> |
Prarit Bhargava | 3195ef5 | 2013-02-14 12:02:54 -0500 | [diff] [blame] | 54 | #include <asm/rtc.h> |
Borislav Petkov | a5d90c9 | 2014-03-04 17:02:17 +0100 | [diff] [blame] | 55 | #include <asm/uv/uv.h> |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 56 | |
Borislav Petkov | f4fccac | 2013-10-31 17:24:59 +0100 | [diff] [blame] | 57 | #define EFI_DEBUG |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 58 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 59 | struct efi_memory_map memmap; |
| 60 | |
Harvey Harrison | ecaea42 | 2008-02-13 13:26:13 -0800 | [diff] [blame] | 61 | static struct efi efi_phys __initdata; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 62 | static efi_system_table_t efi_systab __initdata; |
| 63 | |
Joe Perches | 9b7d204 | 2014-01-03 16:08:48 -0800 | [diff] [blame] | 64 | static efi_config_table_type_t arch_tables[] __initdata = { |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 65 | #ifdef CONFIG_X86_UV |
| 66 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, |
| 67 | #endif |
Leif Lindholm | 722da9d | 2013-10-03 15:42:37 +0100 | [diff] [blame] | 68 | {NULL_GUID, NULL, NULL}, |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 69 | }; |
| 70 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 71 | u64 efi_setup; /* efi setup_data physical address */ |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 72 | |
Mathias Krause | 6092068 | 2014-09-07 19:42:15 +0200 | [diff] [blame] | 73 | static int add_efi_memmap __initdata; |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 74 | static int __init setup_add_efi_memmap(char *arg) |
| 75 | { |
| 76 | add_efi_memmap = 1; |
| 77 | return 0; |
| 78 | } |
| 79 | early_param("add_efi_memmap", setup_add_efi_memmap); |
| 80 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 81 | static efi_status_t __init phys_efi_set_virtual_address_map( |
| 82 | unsigned long memory_map_size, |
| 83 | unsigned long descriptor_size, |
| 84 | u32 descriptor_version, |
| 85 | efi_memory_desc_t *virtual_map) |
| 86 | { |
| 87 | efi_status_t status; |
Ingo Molnar | 23a0d4e | 2015-03-03 07:34:33 +0100 | [diff] [blame] | 88 | unsigned long flags; |
Ingo Molnar | 744937b | 2015-03-03 07:48:50 +0100 | [diff] [blame] | 89 | pgd_t *save_pgd; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 90 | |
Ingo Molnar | 744937b | 2015-03-03 07:48:50 +0100 | [diff] [blame] | 91 | save_pgd = efi_call_phys_prolog(); |
Ingo Molnar | 23a0d4e | 2015-03-03 07:34:33 +0100 | [diff] [blame] | 92 | |
| 93 | /* Disable interrupts around EFI calls: */ |
| 94 | local_irq_save(flags); |
Matt Fleming | 62fa6e6 | 2014-03-27 15:10:39 -0700 | [diff] [blame] | 95 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
| 96 | memory_map_size, descriptor_size, |
| 97 | descriptor_version, virtual_map); |
Ingo Molnar | 23a0d4e | 2015-03-03 07:34:33 +0100 | [diff] [blame] | 98 | local_irq_restore(flags); |
| 99 | |
Ingo Molnar | 744937b | 2015-03-03 07:48:50 +0100 | [diff] [blame] | 100 | efi_call_phys_epilog(save_pgd); |
Ingo Molnar | 23a0d4e | 2015-03-03 07:34:33 +0100 | [diff] [blame] | 101 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 102 | return status; |
| 103 | } |
| 104 | |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 105 | void efi_get_time(struct timespec *now) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 106 | { |
| 107 | efi_status_t status; |
| 108 | efi_time_t eft; |
| 109 | efi_time_cap_t cap; |
| 110 | |
| 111 | status = efi.get_time(&eft, &cap); |
| 112 | if (status != EFI_SUCCESS) |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 113 | pr_err("Oops: efitime: can't read time!\n"); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 114 | |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 115 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
| 116 | eft.minute, eft.second); |
| 117 | now->tv_nsec = 0; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 118 | } |
| 119 | |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 120 | /* |
| 121 | * Tell the kernel about the EFI memory map. This might include |
| 122 | * more than the max 128 entries that can fit in the e820 legacy |
| 123 | * (zeropage) memory map. |
| 124 | */ |
| 125 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 126 | static void __init do_add_efi_memmap(void) |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 127 | { |
| 128 | void *p; |
| 129 | |
| 130 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 131 | efi_memory_desc_t *md = p; |
| 132 | unsigned long long start = md->phys_addr; |
| 133 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; |
| 134 | int e820_type; |
| 135 | |
Cliff Wickman | e2a7147 | 2009-06-16 16:43:40 -0500 | [diff] [blame] | 136 | switch (md->type) { |
| 137 | case EFI_LOADER_CODE: |
| 138 | case EFI_LOADER_DATA: |
| 139 | case EFI_BOOT_SERVICES_CODE: |
| 140 | case EFI_BOOT_SERVICES_DATA: |
| 141 | case EFI_CONVENTIONAL_MEMORY: |
| 142 | if (md->attribute & EFI_MEMORY_WB) |
| 143 | e820_type = E820_RAM; |
| 144 | else |
| 145 | e820_type = E820_RESERVED; |
| 146 | break; |
| 147 | case EFI_ACPI_RECLAIM_MEMORY: |
| 148 | e820_type = E820_ACPI; |
| 149 | break; |
| 150 | case EFI_ACPI_MEMORY_NVS: |
| 151 | e820_type = E820_NVS; |
| 152 | break; |
| 153 | case EFI_UNUSABLE_MEMORY: |
| 154 | e820_type = E820_UNUSABLE; |
| 155 | break; |
| 156 | default: |
| 157 | /* |
| 158 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE |
| 159 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO |
| 160 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE |
| 161 | */ |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 162 | e820_type = E820_RESERVED; |
Cliff Wickman | e2a7147 | 2009-06-16 16:43:40 -0500 | [diff] [blame] | 163 | break; |
| 164 | } |
Yinghai Lu | d0be6bd | 2008-06-15 18:58:51 -0700 | [diff] [blame] | 165 | e820_add_region(start, size, e820_type); |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 166 | } |
| 167 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
| 168 | } |
| 169 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 170 | int __init efi_memblock_x86_reserve_range(void) |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 171 | { |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 172 | struct efi_info *e = &boot_params.efi_info; |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 173 | unsigned long pmap; |
| 174 | |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 175 | if (efi_enabled(EFI_PARAVIRT)) |
| 176 | return 0; |
| 177 | |
Paul Jackson | 05486fa | 2008-06-22 07:22:02 -0700 | [diff] [blame] | 178 | #ifdef CONFIG_X86_32 |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 179 | /* Can't handle data above 4GB at this time */ |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 180 | if (e->efi_memmap_hi) { |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 181 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
| 182 | return -EINVAL; |
| 183 | } |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 184 | pmap = e->efi_memmap; |
Paul Jackson | 05486fa | 2008-06-22 07:22:02 -0700 | [diff] [blame] | 185 | #else |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 186 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 187 | #endif |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 188 | memmap.phys_map = (void *)pmap; |
| 189 | memmap.nr_map = e->efi_memmap_size / |
| 190 | e->efi_memdesc_size; |
| 191 | memmap.desc_size = e->efi_memdesc_size; |
| 192 | memmap.desc_version = e->efi_memdesc_version; |
| 193 | |
Tejun Heo | 24aa078 | 2011-07-12 11:16:06 +0200 | [diff] [blame] | 194 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 195 | |
Leif Lindholm | 258f6fd | 2013-09-05 11:34:55 +0100 | [diff] [blame] | 196 | efi.memmap = &memmap; |
| 197 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 198 | return 0; |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 199 | } |
| 200 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 201 | static void __init print_efi_memmap(void) |
| 202 | { |
Borislav Petkov | f4fccac | 2013-10-31 17:24:59 +0100 | [diff] [blame] | 203 | #ifdef EFI_DEBUG |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 204 | efi_memory_desc_t *md; |
| 205 | void *p; |
| 206 | int i; |
| 207 | |
| 208 | for (p = memmap.map, i = 0; |
| 209 | p < memmap.map_end; |
| 210 | p += memmap.desc_size, i++) { |
Laszlo Ersek | ace1d12 | 2014-09-03 13:32:21 +0200 | [diff] [blame] | 211 | char buf[64]; |
| 212 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 213 | md = p; |
Laszlo Ersek | ace1d12 | 2014-09-03 13:32:21 +0200 | [diff] [blame] | 214 | pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n", |
| 215 | i, efi_md_typeattr_format(buf, sizeof(buf), md), |
| 216 | md->phys_addr, |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 217 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
| 218 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
| 219 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 220 | #endif /* EFI_DEBUG */ |
Borislav Petkov | f4fccac | 2013-10-31 17:24:59 +0100 | [diff] [blame] | 221 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 222 | |
Olof Johansson | 5189c2a | 2012-10-24 10:00:44 -0700 | [diff] [blame] | 223 | void __init efi_unmap_memmap(void) |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 224 | { |
Matt Fleming | 3e90959 | 2014-01-15 13:21:22 +0000 | [diff] [blame] | 225 | clear_bit(EFI_MEMMAP, &efi.flags); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 226 | if (memmap.map) { |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 227 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 228 | memmap.map = NULL; |
| 229 | } |
| 230 | } |
| 231 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 232 | static int __init efi_systab_init(void *phys) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 233 | { |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 234 | if (efi_enabled(EFI_64BIT)) { |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 235 | efi_system_table_64_t *systab64; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 236 | struct efi_setup_data *data = NULL; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 237 | u64 tmp = 0; |
| 238 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 239 | if (efi_setup) { |
| 240 | data = early_memremap(efi_setup, sizeof(*data)); |
| 241 | if (!data) |
| 242 | return -ENOMEM; |
| 243 | } |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 244 | systab64 = early_memremap((unsigned long)phys, |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 245 | sizeof(*systab64)); |
| 246 | if (systab64 == NULL) { |
| 247 | pr_err("Couldn't map the system table!\n"); |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 248 | if (data) |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 249 | early_memunmap(data, sizeof(*data)); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 250 | return -ENOMEM; |
| 251 | } |
| 252 | |
| 253 | efi_systab.hdr = systab64->hdr; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 254 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
| 255 | systab64->fw_vendor; |
| 256 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 257 | efi_systab.fw_revision = systab64->fw_revision; |
| 258 | efi_systab.con_in_handle = systab64->con_in_handle; |
| 259 | tmp |= systab64->con_in_handle; |
| 260 | efi_systab.con_in = systab64->con_in; |
| 261 | tmp |= systab64->con_in; |
| 262 | efi_systab.con_out_handle = systab64->con_out_handle; |
| 263 | tmp |= systab64->con_out_handle; |
| 264 | efi_systab.con_out = systab64->con_out; |
| 265 | tmp |= systab64->con_out; |
| 266 | efi_systab.stderr_handle = systab64->stderr_handle; |
| 267 | tmp |= systab64->stderr_handle; |
| 268 | efi_systab.stderr = systab64->stderr; |
| 269 | tmp |= systab64->stderr; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 270 | efi_systab.runtime = data ? |
| 271 | (void *)(unsigned long)data->runtime : |
| 272 | (void *)(unsigned long)systab64->runtime; |
| 273 | tmp |= data ? data->runtime : systab64->runtime; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 274 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
| 275 | tmp |= systab64->boottime; |
| 276 | efi_systab.nr_tables = systab64->nr_tables; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 277 | efi_systab.tables = data ? (unsigned long)data->tables : |
| 278 | systab64->tables; |
| 279 | tmp |= data ? data->tables : systab64->tables; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 280 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 281 | early_memunmap(systab64, sizeof(*systab64)); |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 282 | if (data) |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 283 | early_memunmap(data, sizeof(*data)); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 284 | #ifdef CONFIG_X86_32 |
| 285 | if (tmp >> 32) { |
| 286 | pr_err("EFI data located above 4GB, disabling EFI.\n"); |
| 287 | return -EINVAL; |
| 288 | } |
| 289 | #endif |
| 290 | } else { |
| 291 | efi_system_table_32_t *systab32; |
| 292 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 293 | systab32 = early_memremap((unsigned long)phys, |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 294 | sizeof(*systab32)); |
| 295 | if (systab32 == NULL) { |
| 296 | pr_err("Couldn't map the system table!\n"); |
| 297 | return -ENOMEM; |
| 298 | } |
| 299 | |
| 300 | efi_systab.hdr = systab32->hdr; |
| 301 | efi_systab.fw_vendor = systab32->fw_vendor; |
| 302 | efi_systab.fw_revision = systab32->fw_revision; |
| 303 | efi_systab.con_in_handle = systab32->con_in_handle; |
| 304 | efi_systab.con_in = systab32->con_in; |
| 305 | efi_systab.con_out_handle = systab32->con_out_handle; |
| 306 | efi_systab.con_out = systab32->con_out; |
| 307 | efi_systab.stderr_handle = systab32->stderr_handle; |
| 308 | efi_systab.stderr = systab32->stderr; |
| 309 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; |
| 310 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; |
| 311 | efi_systab.nr_tables = systab32->nr_tables; |
| 312 | efi_systab.tables = systab32->tables; |
| 313 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 314 | early_memunmap(systab32, sizeof(*systab32)); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 315 | } |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 316 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 317 | efi.systab = &efi_systab; |
| 318 | |
| 319 | /* |
| 320 | * Verify the EFI Table |
| 321 | */ |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 322 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 323 | pr_err("System table signature incorrect!\n"); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 324 | return -EINVAL; |
| 325 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 326 | if ((efi.systab->hdr.revision >> 16) == 0) |
Joe Perches | 9b7d204 | 2014-01-03 16:08:48 -0800 | [diff] [blame] | 327 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 328 | efi.systab->hdr.revision >> 16, |
| 329 | efi.systab->hdr.revision & 0xffff); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 330 | |
Matt Fleming | 0f8093a | 2014-01-15 13:36:33 +0000 | [diff] [blame] | 331 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
| 332 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 333 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 334 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 335 | |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 336 | static int __init efi_runtime_init32(void) |
| 337 | { |
| 338 | efi_runtime_services_32_t *runtime; |
| 339 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 340 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 341 | sizeof(efi_runtime_services_32_t)); |
| 342 | if (!runtime) { |
| 343 | pr_err("Could not map the runtime service table!\n"); |
| 344 | return -ENOMEM; |
| 345 | } |
| 346 | |
| 347 | /* |
Mathias Krause | 0ce4605 | 2014-09-07 19:42:16 +0200 | [diff] [blame] | 348 | * We will only need *early* access to the SetVirtualAddressMap |
| 349 | * EFI runtime service. All other runtime services will be called |
| 350 | * via the virtual mapping. |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 351 | */ |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 352 | efi_phys.set_virtual_address_map = |
| 353 | (efi_set_virtual_address_map_t *) |
| 354 | (unsigned long)runtime->set_virtual_address_map; |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 355 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | static int __init efi_runtime_init64(void) |
| 361 | { |
| 362 | efi_runtime_services_64_t *runtime; |
| 363 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 364 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 365 | sizeof(efi_runtime_services_64_t)); |
| 366 | if (!runtime) { |
| 367 | pr_err("Could not map the runtime service table!\n"); |
| 368 | return -ENOMEM; |
| 369 | } |
| 370 | |
| 371 | /* |
Mathias Krause | 0ce4605 | 2014-09-07 19:42:16 +0200 | [diff] [blame] | 372 | * We will only need *early* access to the SetVirtualAddressMap |
| 373 | * EFI runtime service. All other runtime services will be called |
| 374 | * via the virtual mapping. |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 375 | */ |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 376 | efi_phys.set_virtual_address_map = |
| 377 | (efi_set_virtual_address_map_t *) |
| 378 | (unsigned long)runtime->set_virtual_address_map; |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 379 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 384 | static int __init efi_runtime_init(void) |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 385 | { |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 386 | int rv; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 387 | |
| 388 | /* |
| 389 | * Check out the runtime services table. We need to map |
| 390 | * the runtime services table so that we can grab the physical |
| 391 | * address of several of the EFI runtime functions, needed to |
| 392 | * set the firmware into virtual mode. |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 393 | * |
| 394 | * When EFI_PARAVIRT is in force then we could not map runtime |
| 395 | * service memory region because we do not have direct access to it. |
| 396 | * However, runtime services are available through proxy functions |
| 397 | * (e.g. in case of Xen dom0 EFI implementation they call special |
| 398 | * hypercall which executes relevant EFI functions) and that is why |
| 399 | * they are always enabled. |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 400 | */ |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 401 | |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 402 | if (!efi_enabled(EFI_PARAVIRT)) { |
| 403 | if (efi_enabled(EFI_64BIT)) |
| 404 | rv = efi_runtime_init64(); |
| 405 | else |
| 406 | rv = efi_runtime_init32(); |
| 407 | |
| 408 | if (rv) |
| 409 | return rv; |
| 410 | } |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 411 | |
Matt Fleming | 0f8093a | 2014-01-15 13:36:33 +0000 | [diff] [blame] | 412 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
| 413 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 414 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 415 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 416 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 417 | static int __init efi_memmap_init(void) |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 418 | { |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 419 | if (efi_enabled(EFI_PARAVIRT)) |
| 420 | return 0; |
| 421 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 422 | /* Map the EFI memory map */ |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 423 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 424 | memmap.nr_map * memmap.desc_size); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 425 | if (memmap.map == NULL) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 426 | pr_err("Could not map the memory map!\n"); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 427 | return -ENOMEM; |
| 428 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 429 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
Russ Anderson | 175e438 | 2008-10-02 17:32:06 -0500 | [diff] [blame] | 430 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 431 | if (add_efi_memmap) |
| 432 | do_add_efi_memmap(); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 433 | |
Matt Fleming | 0f8093a | 2014-01-15 13:36:33 +0000 | [diff] [blame] | 434 | set_bit(EFI_MEMMAP, &efi.flags); |
| 435 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 436 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 437 | } |
| 438 | |
| 439 | void __init efi_init(void) |
| 440 | { |
| 441 | efi_char16_t *c16; |
| 442 | char vendor[100] = "unknown"; |
| 443 | int i = 0; |
| 444 | void *tmp; |
| 445 | |
| 446 | #ifdef CONFIG_X86_32 |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 447 | if (boot_params.efi_info.efi_systab_hi || |
| 448 | boot_params.efi_info.efi_memmap_hi) { |
| 449 | pr_info("Table located above 4GB, disabling EFI.\n"); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 450 | return; |
| 451 | } |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 452 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
| 453 | #else |
| 454 | efi_phys.systab = (efi_system_table_t *) |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 455 | (boot_params.efi_info.efi_systab | |
| 456 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 457 | #endif |
| 458 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 459 | if (efi_systab_init(efi_phys.systab)) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 460 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 461 | |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 462 | efi.config_table = (unsigned long)efi.systab->tables; |
| 463 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; |
| 464 | efi.runtime = (unsigned long)efi.systab->runtime; |
| 465 | |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 466 | /* |
| 467 | * Show what we know for posterity |
| 468 | */ |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 469 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 470 | if (c16) { |
| 471 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) |
| 472 | vendor[i] = *c16++; |
| 473 | vendor[i] = '\0'; |
| 474 | } else |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 475 | pr_err("Could not map the firmware vendor!\n"); |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 476 | early_memunmap(tmp, 2); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 477 | |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 478 | pr_info("EFI v%u.%.02u by %s\n", |
| 479 | efi.systab->hdr.revision >> 16, |
| 480 | efi.systab->hdr.revision & 0xffff, vendor); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 481 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 482 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
| 483 | return; |
| 484 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 485 | if (efi_config_init(arch_tables)) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 486 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 487 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 488 | /* |
| 489 | * Note: We currently don't support runtime services on an EFI |
| 490 | * that doesn't match the kernel 32/64-bit mode. |
| 491 | */ |
| 492 | |
Matt Fleming | 7d453ee | 2014-01-10 18:52:06 +0000 | [diff] [blame] | 493 | if (!efi_runtime_supported()) |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 494 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 495 | else { |
Dave Young | b2e0a54 | 2014-08-14 17:15:26 +0800 | [diff] [blame] | 496 | if (efi_runtime_disabled() || efi_runtime_init()) |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 497 | return; |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 498 | } |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 499 | if (efi_memmap_init()) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 500 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 501 | |
Borislav Petkov | fed6cef | 2015-02-05 11:44:41 +0100 | [diff] [blame] | 502 | if (efi_enabled(EFI_DBG)) |
| 503 | print_efi_memmap(); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 504 | } |
| 505 | |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 506 | void __init efi_late_init(void) |
| 507 | { |
| 508 | efi_bgrt_init(); |
| 509 | } |
| 510 | |
Matthew Garrett | 9cd2b07 | 2011-05-05 15:19:43 -0400 | [diff] [blame] | 511 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
| 512 | { |
| 513 | u64 addr, npages; |
| 514 | |
| 515 | addr = md->virt_addr; |
| 516 | npages = md->num_pages; |
| 517 | |
| 518 | memrange_efi_to_native(&addr, &npages); |
| 519 | |
| 520 | if (executable) |
| 521 | set_memory_x(addr, npages); |
| 522 | else |
| 523 | set_memory_nx(addr, npages); |
| 524 | } |
| 525 | |
Borislav Petkov | c55d016 | 2014-02-14 08:24:24 +0100 | [diff] [blame] | 526 | void __init runtime_code_page_mkexec(void) |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 527 | { |
| 528 | efi_memory_desc_t *md; |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 529 | void *p; |
| 530 | |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 531 | /* Make EFI runtime service code area executable */ |
| 532 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 533 | md = p; |
Huang, Ying | 1c083eb | 2008-02-04 16:48:06 +0100 | [diff] [blame] | 534 | |
| 535 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
| 536 | continue; |
| 537 | |
Matthew Garrett | 9cd2b07 | 2011-05-05 15:19:43 -0400 | [diff] [blame] | 538 | efi_set_executable(md, true); |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 539 | } |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 540 | } |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 541 | |
Mathias Krause | 4e78eb05 | 2014-09-07 19:42:17 +0200 | [diff] [blame] | 542 | void __init efi_memory_uc(u64 addr, unsigned long size) |
Matt Fleming | 3e8fa26 | 2012-10-19 13:25:46 +0100 | [diff] [blame] | 543 | { |
| 544 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; |
| 545 | u64 npages; |
| 546 | |
| 547 | npages = round_up(size, page_shift) / page_shift; |
| 548 | memrange_efi_to_native(&addr, &npages); |
| 549 | set_memory_uc(addr, npages); |
| 550 | } |
| 551 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 552 | void __init old_map_region(efi_memory_desc_t *md) |
| 553 | { |
| 554 | u64 start_pfn, end_pfn, end; |
| 555 | unsigned long size; |
| 556 | void *va; |
| 557 | |
| 558 | start_pfn = PFN_DOWN(md->phys_addr); |
| 559 | size = md->num_pages << PAGE_SHIFT; |
| 560 | end = md->phys_addr + size; |
| 561 | end_pfn = PFN_UP(end); |
| 562 | |
| 563 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { |
| 564 | va = __va(md->phys_addr); |
| 565 | |
| 566 | if (!(md->attribute & EFI_MEMORY_WB)) |
| 567 | efi_memory_uc((u64)(unsigned long)va, size); |
| 568 | } else |
| 569 | va = efi_ioremap(md->phys_addr, size, |
| 570 | md->type, md->attribute); |
| 571 | |
| 572 | md->virt_addr = (u64) (unsigned long) va; |
| 573 | if (!va) |
| 574 | pr_err("ioremap of 0x%llX failed!\n", |
| 575 | (unsigned long long)md->phys_addr); |
| 576 | } |
| 577 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 578 | /* Merge contiguous regions of the same type and attribute */ |
| 579 | static void __init efi_merge_regions(void) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 580 | { |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 581 | void *p; |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 582 | efi_memory_desc_t *md, *prev_md = NULL; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 583 | |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 584 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 585 | u64 prev_size; |
| 586 | md = p; |
| 587 | |
| 588 | if (!prev_md) { |
| 589 | prev_md = md; |
| 590 | continue; |
| 591 | } |
| 592 | |
| 593 | if (prev_md->type != md->type || |
| 594 | prev_md->attribute != md->attribute) { |
| 595 | prev_md = md; |
| 596 | continue; |
| 597 | } |
| 598 | |
| 599 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; |
| 600 | |
| 601 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { |
| 602 | prev_md->num_pages += md->num_pages; |
| 603 | md->type = EFI_RESERVED_TYPE; |
| 604 | md->attribute = 0; |
| 605 | continue; |
| 606 | } |
| 607 | prev_md = md; |
| 608 | } |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) |
| 612 | { |
| 613 | unsigned long size; |
| 614 | u64 end, systab; |
| 615 | |
| 616 | size = md->num_pages << EFI_PAGE_SHIFT; |
| 617 | end = md->phys_addr + size; |
| 618 | systab = (u64)(unsigned long)efi_phys.systab; |
| 619 | if (md->phys_addr <= systab && systab < end) { |
| 620 | systab += md->virt_addr - md->phys_addr; |
| 621 | efi.systab = (efi_system_table_t *)(unsigned long)systab; |
| 622 | } |
| 623 | } |
| 624 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 625 | static void __init save_runtime_map(void) |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 626 | { |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 627 | #ifdef CONFIG_KEXEC |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 628 | efi_memory_desc_t *md; |
| 629 | void *tmp, *p, *q = NULL; |
| 630 | int count = 0; |
| 631 | |
Dave Young | a3530e8 | 2014-05-30 11:20:10 +0800 | [diff] [blame] | 632 | if (efi_enabled(EFI_OLD_MEMMAP)) |
| 633 | return; |
| 634 | |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 635 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 636 | md = p; |
| 637 | |
| 638 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || |
| 639 | (md->type == EFI_BOOT_SERVICES_CODE) || |
| 640 | (md->type == EFI_BOOT_SERVICES_DATA)) |
| 641 | continue; |
| 642 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); |
| 643 | if (!tmp) |
| 644 | goto out; |
| 645 | q = tmp; |
| 646 | |
| 647 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); |
| 648 | count++; |
| 649 | } |
| 650 | |
Matt Fleming | 518548a | 2013-12-21 16:09:46 +0000 | [diff] [blame] | 651 | efi_runtime_map_setup(q, count, memmap.desc_size); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 652 | return; |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 653 | |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 654 | out: |
| 655 | kfree(q); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 656 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
| 657 | #endif |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 658 | } |
| 659 | |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 660 | static void *realloc_pages(void *old_memmap, int old_shift) |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 661 | { |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 662 | void *ret; |
| 663 | |
| 664 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); |
| 665 | if (!ret) |
| 666 | goto out; |
| 667 | |
| 668 | /* |
| 669 | * A first-time allocation doesn't have anything to copy. |
| 670 | */ |
| 671 | if (!old_memmap) |
| 672 | return ret; |
| 673 | |
| 674 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); |
| 675 | |
| 676 | out: |
| 677 | free_pages((unsigned long)old_memmap, old_shift); |
| 678 | return ret; |
| 679 | } |
| 680 | |
| 681 | /* |
| 682 | * Map the efi memory ranges of the runtime services and update new_mmap with |
| 683 | * virtual addresses. |
| 684 | */ |
| 685 | static void * __init efi_map_regions(int *count, int *pg_shift) |
| 686 | { |
| 687 | void *p, *new_memmap = NULL; |
| 688 | unsigned long left = 0; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 689 | efi_memory_desc_t *md; |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 690 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 691 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 692 | md = p; |
Josh Boyer | 7008701 | 2013-04-18 07:51:34 -0700 | [diff] [blame] | 693 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
| 694 | #ifdef CONFIG_X86_64 |
| 695 | if (md->type != EFI_BOOT_SERVICES_CODE && |
| 696 | md->type != EFI_BOOT_SERVICES_DATA) |
| 697 | #endif |
| 698 | continue; |
| 699 | } |
Huang, Ying | 1c083eb | 2008-02-04 16:48:06 +0100 | [diff] [blame] | 700 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 701 | efi_map_region(md); |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 702 | get_systab_virt_addr(md); |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 703 | |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 704 | if (left < memmap.desc_size) { |
| 705 | new_memmap = realloc_pages(new_memmap, *pg_shift); |
| 706 | if (!new_memmap) |
| 707 | return NULL; |
| 708 | |
| 709 | left += PAGE_SIZE << *pg_shift; |
| 710 | (*pg_shift)++; |
| 711 | } |
| 712 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 713 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
Matthew Garrett | 7cb00b7 | 2011-05-05 15:19:45 -0400 | [diff] [blame] | 714 | memmap.desc_size); |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 715 | |
| 716 | left -= memmap.desc_size; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 717 | (*count)++; |
| 718 | } |
| 719 | |
| 720 | return new_memmap; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 721 | } |
| 722 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 723 | static void __init kexec_enter_virtual_mode(void) |
| 724 | { |
| 725 | #ifdef CONFIG_KEXEC |
| 726 | efi_memory_desc_t *md; |
| 727 | void *p; |
| 728 | |
| 729 | efi.systab = NULL; |
| 730 | |
| 731 | /* |
| 732 | * We don't do virtual mode, since we don't do runtime services, on |
| 733 | * non-native EFI |
| 734 | */ |
| 735 | if (!efi_is_native()) { |
| 736 | efi_unmap_memmap(); |
Dave Young | a5a750a | 2014-08-14 17:15:31 +0800 | [diff] [blame] | 737 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 738 | return; |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * Map efi regions which were passed via setup_data. The virt_addr is a |
| 743 | * fixed addr which was used in first kernel of a kexec boot. |
| 744 | */ |
| 745 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 746 | md = p; |
| 747 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
| 748 | get_systab_virt_addr(md); |
| 749 | } |
| 750 | |
| 751 | save_runtime_map(); |
| 752 | |
| 753 | BUG_ON(!efi.systab); |
| 754 | |
| 755 | efi_sync_low_kernel_mappings(); |
| 756 | |
| 757 | /* |
| 758 | * Now that EFI is in virtual mode, update the function |
| 759 | * pointers in the runtime service table to the new virtual addresses. |
| 760 | * |
| 761 | * Call EFI services through wrapper functions. |
| 762 | */ |
| 763 | efi.runtime_version = efi_systab.hdr.revision; |
Matt Fleming | 994448f | 2014-03-05 18:15:37 +0000 | [diff] [blame] | 764 | |
Ard Biesheuvel | 022ee6c | 2014-06-26 12:09:05 +0200 | [diff] [blame] | 765 | efi_native_runtime_setup(); |
Matt Fleming | 994448f | 2014-03-05 18:15:37 +0000 | [diff] [blame] | 766 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 767 | efi.set_virtual_address_map = NULL; |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 768 | |
| 769 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) |
| 770 | runtime_code_page_mkexec(); |
| 771 | |
| 772 | /* clean DUMMY object */ |
Saurabh Tangri | eeb9db0 | 2014-06-02 05:18:35 -0700 | [diff] [blame] | 773 | efi_delete_dummy_variable(); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 774 | #endif |
| 775 | } |
| 776 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 777 | /* |
| 778 | * This function will switch the EFI runtime services to virtual mode. |
| 779 | * Essentially, we look through the EFI memmap and map every region that |
| 780 | * has the runtime attribute bit set in its memory descriptor into the |
| 781 | * ->trampoline_pgd page table using a top-down VA allocation scheme. |
| 782 | * |
| 783 | * The old method which used to update that memory descriptor with the |
| 784 | * virtual address obtained from ioremap() is still supported when the |
| 785 | * kernel is booted with efi=old_map on its command line. Same old |
| 786 | * method enabled the runtime services to be called without having to |
| 787 | * thunk back into physical mode for every invocation. |
| 788 | * |
| 789 | * The new method does a pagetable switch in a preemption-safe manner |
| 790 | * so that we're in a different address space when calling a runtime |
| 791 | * function. For function arguments passing we do copy the PGDs of the |
| 792 | * kernel page table into ->trampoline_pgd prior to each call. |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 793 | * |
| 794 | * Specially for kexec boot, efi runtime maps in previous kernel should |
| 795 | * be passed in via setup_data. In that case runtime ranges will be mapped |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 796 | * to the same virtual addresses as the first kernel, see |
| 797 | * kexec_enter_virtual_mode(). |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 798 | */ |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 799 | static void __init __efi_enter_virtual_mode(void) |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 800 | { |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 801 | int count = 0, pg_shift = 0; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 802 | void *new_memmap = NULL; |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 803 | efi_status_t status; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 804 | |
| 805 | efi.systab = NULL; |
| 806 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 807 | efi_merge_regions(); |
| 808 | new_memmap = efi_map_regions(&count, &pg_shift); |
| 809 | if (!new_memmap) { |
| 810 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); |
Dave Young | a5a750a | 2014-08-14 17:15:31 +0800 | [diff] [blame] | 811 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 812 | return; |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 813 | } |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 814 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 815 | save_runtime_map(); |
| 816 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 817 | BUG_ON(!efi.systab); |
| 818 | |
Dave Young | a5a750a | 2014-08-14 17:15:31 +0800 | [diff] [blame] | 819 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) { |
| 820 | clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 821 | return; |
Dave Young | a5a750a | 2014-08-14 17:15:31 +0800 | [diff] [blame] | 822 | } |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 823 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 824 | efi_sync_low_kernel_mappings(); |
Borislav Petkov | 11cc851 | 2014-01-18 12:48:15 +0100 | [diff] [blame] | 825 | efi_dump_pagetable(); |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 826 | |
Matt Fleming | 994448f | 2014-03-05 18:15:37 +0000 | [diff] [blame] | 827 | if (efi_is_native()) { |
| 828 | status = phys_efi_set_virtual_address_map( |
| 829 | memmap.desc_size * count, |
| 830 | memmap.desc_size, |
| 831 | memmap.desc_version, |
| 832 | (efi_memory_desc_t *)__pa(new_memmap)); |
| 833 | } else { |
| 834 | status = efi_thunk_set_virtual_address_map( |
| 835 | efi_phys.set_virtual_address_map, |
| 836 | memmap.desc_size * count, |
| 837 | memmap.desc_size, |
| 838 | memmap.desc_version, |
| 839 | (efi_memory_desc_t *)__pa(new_memmap)); |
| 840 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 841 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 842 | if (status != EFI_SUCCESS) { |
| 843 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", |
| 844 | status); |
| 845 | panic("EFI call to SetVirtualAddressMap() failed!"); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | /* |
| 849 | * Now that EFI is in virtual mode, update the function |
| 850 | * pointers in the runtime service table to the new virtual addresses. |
| 851 | * |
| 852 | * Call EFI services through wrapper functions. |
| 853 | */ |
Matt Fleming | 712ba9e | 2013-01-25 10:07:25 +0000 | [diff] [blame] | 854 | efi.runtime_version = efi_systab.hdr.revision; |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 855 | |
| 856 | if (efi_is_native()) |
Ard Biesheuvel | 022ee6c | 2014-06-26 12:09:05 +0200 | [diff] [blame] | 857 | efi_native_runtime_setup(); |
Matt Fleming | 4f9dbcf | 2014-01-10 18:48:30 +0000 | [diff] [blame] | 858 | else |
| 859 | efi_thunk_runtime_setup(); |
| 860 | |
Matthew Garrett | 2b5e8ef | 2011-05-05 15:19:42 -0400 | [diff] [blame] | 861 | efi.set_virtual_address_map = NULL; |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 862 | |
Borislav Petkov | c55d016 | 2014-02-14 08:24:24 +0100 | [diff] [blame] | 863 | efi_runtime_mkexec(); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 864 | |
Borislav Petkov | b7b898a | 2014-01-18 12:48:17 +0100 | [diff] [blame] | 865 | /* |
| 866 | * We mapped the descriptor array into the EFI pagetable above but we're |
| 867 | * not unmapping it here. Here's why: |
| 868 | * |
| 869 | * We're copying select PGDs from the kernel page table to the EFI page |
| 870 | * table and when we do so and make changes to those PGDs like unmapping |
| 871 | * stuff from them, those changes appear in the kernel page table and we |
| 872 | * go boom. |
| 873 | * |
| 874 | * From setup_real_mode(): |
| 875 | * |
| 876 | * ... |
| 877 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; |
| 878 | * |
| 879 | * In this particular case, our allocation is in PGD 0 of the EFI page |
| 880 | * table but we've copied that PGD from PGD[272] of the EFI page table: |
| 881 | * |
| 882 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 |
| 883 | * |
| 884 | * where the direct memory mapping in kernel space is. |
| 885 | * |
| 886 | * new_memmap's VA comes from that direct mapping and thus clearing it, |
| 887 | * it would get cleared in the kernel page table too. |
| 888 | * |
| 889 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); |
| 890 | */ |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 891 | free_pages((unsigned long)new_memmap, pg_shift); |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 892 | |
| 893 | /* clean DUMMY object */ |
Saurabh Tangri | eeb9db0 | 2014-06-02 05:18:35 -0700 | [diff] [blame] | 894 | efi_delete_dummy_variable(); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 895 | } |
| 896 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 897 | void __init efi_enter_virtual_mode(void) |
| 898 | { |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 899 | if (efi_enabled(EFI_PARAVIRT)) |
| 900 | return; |
| 901 | |
Borislav Petkov | fabb37c | 2014-01-18 12:48:18 +0100 | [diff] [blame] | 902 | if (efi_setup) |
| 903 | kexec_enter_virtual_mode(); |
| 904 | else |
| 905 | __efi_enter_virtual_mode(); |
| 906 | } |
| 907 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 908 | /* |
| 909 | * Convenience functions to obtain memory types and attributes |
| 910 | */ |
| 911 | u32 efi_mem_type(unsigned long phys_addr) |
| 912 | { |
| 913 | efi_memory_desc_t *md; |
| 914 | void *p; |
| 915 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 916 | if (!efi_enabled(EFI_MEMMAP)) |
| 917 | return 0; |
| 918 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 919 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 920 | md = p; |
| 921 | if ((md->phys_addr <= phys_addr) && |
| 922 | (phys_addr < (md->phys_addr + |
| 923 | (md->num_pages << EFI_PAGE_SHIFT)))) |
| 924 | return md->type; |
| 925 | } |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | u64 efi_mem_attributes(unsigned long phys_addr) |
| 930 | { |
| 931 | efi_memory_desc_t *md; |
| 932 | void *p; |
| 933 | |
Daniel Kiper | 67a9b9c | 2014-06-30 19:52:57 +0200 | [diff] [blame] | 934 | if (!efi_enabled(EFI_MEMMAP)) |
| 935 | return 0; |
| 936 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 937 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 938 | md = p; |
| 939 | if ((md->phys_addr <= phys_addr) && |
| 940 | (phys_addr < (md->phys_addr + |
| 941 | (md->num_pages << EFI_PAGE_SHIFT)))) |
| 942 | return md->attribute; |
| 943 | } |
| 944 | return 0; |
| 945 | } |
Matt Fleming | a6e4d5a | 2013-03-25 09:14:30 +0000 | [diff] [blame] | 946 | |
Dave Young | 5ae3683 | 2014-08-14 17:15:28 +0800 | [diff] [blame] | 947 | static int __init arch_parse_efi_cmdline(char *str) |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 948 | { |
Dave Young | 6ccc72b | 2014-08-14 17:15:27 +0800 | [diff] [blame] | 949 | if (parse_option_str(str, "old_map")) |
| 950 | set_bit(EFI_OLD_MEMMAP, &efi.flags); |
Borislav Petkov | fed6cef | 2015-02-05 11:44:41 +0100 | [diff] [blame] | 951 | if (parse_option_str(str, "debug")) |
| 952 | set_bit(EFI_DBG, &efi.flags); |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 953 | |
| 954 | return 0; |
| 955 | } |
Dave Young | 5ae3683 | 2014-08-14 17:15:28 +0800 | [diff] [blame] | 956 | early_param("efi", arch_parse_efi_cmdline); |