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 | |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 59 | #define EFI_MIN_RESERVE 5120 |
| 60 | |
| 61 | #define EFI_DUMMY_GUID \ |
| 62 | EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9) |
| 63 | |
| 64 | static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; |
Matthew Garrett | 31ff2f2 | 2013-04-15 13:09:47 -0700 | [diff] [blame] | 65 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 66 | struct efi_memory_map memmap; |
| 67 | |
Harvey Harrison | ecaea42 | 2008-02-13 13:26:13 -0800 | [diff] [blame] | 68 | static struct efi efi_phys __initdata; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 69 | static efi_system_table_t efi_systab __initdata; |
| 70 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 71 | unsigned long x86_efi_facility; |
| 72 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 73 | static __initdata efi_config_table_type_t arch_tables[] = { |
| 74 | #ifdef CONFIG_X86_UV |
| 75 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, |
| 76 | #endif |
Leif Lindholm | 722da9d | 2013-10-03 15:42:37 +0100 | [diff] [blame] | 77 | {NULL_GUID, NULL, NULL}, |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 78 | }; |
| 79 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 80 | u64 efi_setup; /* efi setup_data physical address */ |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 81 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 82 | /* |
| 83 | * Returns 1 if 'facility' is enabled, 0 otherwise. |
| 84 | */ |
| 85 | int efi_enabled(int facility) |
| 86 | { |
| 87 | return test_bit(facility, &x86_efi_facility) != 0; |
| 88 | } |
| 89 | EXPORT_SYMBOL(efi_enabled); |
| 90 | |
Matt Fleming | 058e7b5 | 2013-02-22 15:03:47 +0000 | [diff] [blame] | 91 | static bool __initdata disable_runtime = false; |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 92 | static int __init setup_noefi(char *arg) |
| 93 | { |
Matt Fleming | fb834c7 | 2013-02-20 20:36:12 +0000 | [diff] [blame] | 94 | disable_runtime = true; |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 95 | return 0; |
| 96 | } |
| 97 | early_param("noefi", setup_noefi); |
| 98 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 99 | int add_efi_memmap; |
| 100 | EXPORT_SYMBOL(add_efi_memmap); |
| 101 | |
| 102 | static int __init setup_add_efi_memmap(char *arg) |
| 103 | { |
| 104 | add_efi_memmap = 1; |
| 105 | return 0; |
| 106 | } |
| 107 | early_param("add_efi_memmap", setup_add_efi_memmap); |
| 108 | |
Richard Weinberger | 8c58bf3 | 2013-04-17 01:00:53 +0200 | [diff] [blame] | 109 | static bool efi_no_storage_paranoia; |
| 110 | |
| 111 | static int __init setup_storage_paranoia(char *arg) |
| 112 | { |
| 113 | efi_no_storage_paranoia = true; |
| 114 | return 0; |
| 115 | } |
| 116 | early_param("efi_no_storage_paranoia", setup_storage_paranoia); |
| 117 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 118 | static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
| 119 | { |
Jan Beulich | ef68c8f | 2011-07-19 11:53:07 +0100 | [diff] [blame] | 120 | unsigned long flags; |
| 121 | efi_status_t status; |
| 122 | |
| 123 | spin_lock_irqsave(&rtc_lock, flags); |
| 124 | status = efi_call_virt2(get_time, tm, tc); |
| 125 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 126 | return status; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | static efi_status_t virt_efi_set_time(efi_time_t *tm) |
| 130 | { |
Jan Beulich | ef68c8f | 2011-07-19 11:53:07 +0100 | [diff] [blame] | 131 | unsigned long flags; |
| 132 | efi_status_t status; |
| 133 | |
| 134 | spin_lock_irqsave(&rtc_lock, flags); |
| 135 | status = efi_call_virt1(set_time, tm); |
| 136 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 137 | return status; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, |
| 141 | efi_bool_t *pending, |
| 142 | efi_time_t *tm) |
| 143 | { |
Jan Beulich | ef68c8f | 2011-07-19 11:53:07 +0100 | [diff] [blame] | 144 | unsigned long flags; |
| 145 | efi_status_t status; |
| 146 | |
| 147 | spin_lock_irqsave(&rtc_lock, flags); |
| 148 | status = efi_call_virt3(get_wakeup_time, |
| 149 | enabled, pending, tm); |
| 150 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 151 | return status; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) |
| 155 | { |
Jan Beulich | ef68c8f | 2011-07-19 11:53:07 +0100 | [diff] [blame] | 156 | unsigned long flags; |
| 157 | efi_status_t status; |
| 158 | |
| 159 | spin_lock_irqsave(&rtc_lock, flags); |
| 160 | status = efi_call_virt2(set_wakeup_time, |
| 161 | enabled, tm); |
| 162 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 163 | return status; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | static efi_status_t virt_efi_get_variable(efi_char16_t *name, |
| 167 | efi_guid_t *vendor, |
| 168 | u32 *attr, |
| 169 | unsigned long *data_size, |
| 170 | void *data) |
| 171 | { |
| 172 | return efi_call_virt5(get_variable, |
| 173 | name, vendor, attr, |
| 174 | data_size, data); |
| 175 | } |
| 176 | |
| 177 | static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, |
| 178 | efi_char16_t *name, |
| 179 | efi_guid_t *vendor) |
| 180 | { |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 181 | return efi_call_virt3(get_next_variable, |
| 182 | name_size, name, vendor); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static efi_status_t virt_efi_set_variable(efi_char16_t *name, |
| 186 | efi_guid_t *vendor, |
Matthew Garrett | f7a2d73 | 2011-06-06 15:36:24 -0400 | [diff] [blame] | 187 | u32 attr, |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 188 | unsigned long data_size, |
| 189 | void *data) |
| 190 | { |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 191 | return efi_call_virt5(set_variable, |
| 192 | name, vendor, attr, |
| 193 | data_size, data); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 194 | } |
| 195 | |
Matthew Garrett | 3b37023 | 2011-06-06 15:36:25 -0400 | [diff] [blame] | 196 | static efi_status_t virt_efi_query_variable_info(u32 attr, |
| 197 | u64 *storage_space, |
| 198 | u64 *remaining_space, |
| 199 | u64 *max_variable_size) |
| 200 | { |
| 201 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) |
| 202 | return EFI_UNSUPPORTED; |
| 203 | |
| 204 | return efi_call_virt4(query_variable_info, attr, storage_space, |
| 205 | remaining_space, max_variable_size); |
| 206 | } |
| 207 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 208 | static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
| 209 | { |
| 210 | return efi_call_virt1(get_next_high_mono_count, count); |
| 211 | } |
| 212 | |
| 213 | static void virt_efi_reset_system(int reset_type, |
| 214 | efi_status_t status, |
| 215 | unsigned long data_size, |
| 216 | efi_char16_t *data) |
| 217 | { |
| 218 | efi_call_virt4(reset_system, reset_type, status, |
| 219 | data_size, data); |
| 220 | } |
| 221 | |
Matthew Garrett | 3b37023 | 2011-06-06 15:36:25 -0400 | [diff] [blame] | 222 | static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
| 223 | unsigned long count, |
| 224 | unsigned long sg_list) |
| 225 | { |
| 226 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) |
| 227 | return EFI_UNSUPPORTED; |
| 228 | |
| 229 | return efi_call_virt3(update_capsule, capsules, count, sg_list); |
| 230 | } |
| 231 | |
| 232 | static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, |
| 233 | unsigned long count, |
| 234 | u64 *max_size, |
| 235 | int *reset_type) |
| 236 | { |
| 237 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) |
| 238 | return EFI_UNSUPPORTED; |
| 239 | |
| 240 | return efi_call_virt4(query_capsule_caps, capsules, count, max_size, |
| 241 | reset_type); |
| 242 | } |
| 243 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 244 | static efi_status_t __init phys_efi_set_virtual_address_map( |
| 245 | unsigned long memory_map_size, |
| 246 | unsigned long descriptor_size, |
| 247 | u32 descriptor_version, |
| 248 | efi_memory_desc_t *virtual_map) |
| 249 | { |
| 250 | efi_status_t status; |
| 251 | |
| 252 | efi_call_phys_prelog(); |
| 253 | status = efi_call_phys4(efi_phys.set_virtual_address_map, |
| 254 | memory_map_size, descriptor_size, |
| 255 | descriptor_version, virtual_map); |
| 256 | efi_call_phys_epilog(); |
| 257 | return status; |
| 258 | } |
| 259 | |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 260 | static efi_status_t __init phys_efi_get_time(efi_time_t *tm, |
| 261 | efi_time_cap_t *tc) |
| 262 | { |
| 263 | unsigned long flags; |
| 264 | efi_status_t status; |
| 265 | |
| 266 | spin_lock_irqsave(&rtc_lock, flags); |
| 267 | efi_call_phys_prelog(); |
| 268 | status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), |
| 269 | virt_to_phys(tc)); |
| 270 | efi_call_phys_epilog(); |
| 271 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 272 | return status; |
| 273 | } |
| 274 | |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 275 | int efi_set_rtc_mmss(const struct timespec *now) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 276 | { |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 277 | unsigned long nowtime = now->tv_sec; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 278 | efi_status_t status; |
| 279 | efi_time_t eft; |
| 280 | efi_time_cap_t cap; |
Prarit Bhargava | 3195ef5 | 2013-02-14 12:02:54 -0500 | [diff] [blame] | 281 | struct rtc_time tm; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 282 | |
| 283 | status = efi.get_time(&eft, &cap); |
| 284 | if (status != EFI_SUCCESS) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 285 | pr_err("Oops: efitime: can't read time!\n"); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 286 | return -1; |
| 287 | } |
| 288 | |
Prarit Bhargava | 3195ef5 | 2013-02-14 12:02:54 -0500 | [diff] [blame] | 289 | rtc_time_to_tm(nowtime, &tm); |
| 290 | if (!rtc_valid_tm(&tm)) { |
| 291 | eft.year = tm.tm_year + 1900; |
| 292 | eft.month = tm.tm_mon + 1; |
| 293 | eft.day = tm.tm_mday; |
| 294 | eft.minute = tm.tm_min; |
| 295 | eft.second = tm.tm_sec; |
| 296 | eft.nanosecond = 0; |
| 297 | } else { |
| 298 | printk(KERN_ERR |
| 299 | "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", |
| 300 | __FUNCTION__, nowtime); |
| 301 | return -1; |
| 302 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 303 | |
| 304 | status = efi.set_time(&eft); |
| 305 | if (status != EFI_SUCCESS) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 306 | pr_err("Oops: efitime: can't write time!\n"); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 307 | return -1; |
| 308 | } |
| 309 | return 0; |
| 310 | } |
| 311 | |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 312 | void efi_get_time(struct timespec *now) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 313 | { |
| 314 | efi_status_t status; |
| 315 | efi_time_t eft; |
| 316 | efi_time_cap_t cap; |
| 317 | |
| 318 | status = efi.get_time(&eft, &cap); |
| 319 | if (status != EFI_SUCCESS) |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 320 | pr_err("Oops: efitime: can't read time!\n"); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 321 | |
David Vrabel | 3565184 | 2013-05-13 18:56:06 +0100 | [diff] [blame] | 322 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
| 323 | eft.minute, eft.second); |
| 324 | now->tv_nsec = 0; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 325 | } |
| 326 | |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 327 | /* |
| 328 | * Tell the kernel about the EFI memory map. This might include |
| 329 | * more than the max 128 entries that can fit in the e820 legacy |
| 330 | * (zeropage) memory map. |
| 331 | */ |
| 332 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 333 | static void __init do_add_efi_memmap(void) |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 334 | { |
| 335 | void *p; |
| 336 | |
| 337 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 338 | efi_memory_desc_t *md = p; |
| 339 | unsigned long long start = md->phys_addr; |
| 340 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; |
| 341 | int e820_type; |
| 342 | |
Cliff Wickman | e2a7147 | 2009-06-16 16:43:40 -0500 | [diff] [blame] | 343 | switch (md->type) { |
| 344 | case EFI_LOADER_CODE: |
| 345 | case EFI_LOADER_DATA: |
| 346 | case EFI_BOOT_SERVICES_CODE: |
| 347 | case EFI_BOOT_SERVICES_DATA: |
| 348 | case EFI_CONVENTIONAL_MEMORY: |
| 349 | if (md->attribute & EFI_MEMORY_WB) |
| 350 | e820_type = E820_RAM; |
| 351 | else |
| 352 | e820_type = E820_RESERVED; |
| 353 | break; |
| 354 | case EFI_ACPI_RECLAIM_MEMORY: |
| 355 | e820_type = E820_ACPI; |
| 356 | break; |
| 357 | case EFI_ACPI_MEMORY_NVS: |
| 358 | e820_type = E820_NVS; |
| 359 | break; |
| 360 | case EFI_UNUSABLE_MEMORY: |
| 361 | e820_type = E820_UNUSABLE; |
| 362 | break; |
| 363 | default: |
| 364 | /* |
| 365 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE |
| 366 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO |
| 367 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE |
| 368 | */ |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 369 | e820_type = E820_RESERVED; |
Cliff Wickman | e2a7147 | 2009-06-16 16:43:40 -0500 | [diff] [blame] | 370 | break; |
| 371 | } |
Yinghai Lu | d0be6bd | 2008-06-15 18:58:51 -0700 | [diff] [blame] | 372 | e820_add_region(start, size, e820_type); |
Paul Jackson | 69c9189 | 2008-05-14 08:15:58 -0700 | [diff] [blame] | 373 | } |
| 374 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
| 375 | } |
| 376 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 377 | int __init efi_memblock_x86_reserve_range(void) |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 378 | { |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 379 | struct efi_info *e = &boot_params.efi_info; |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 380 | unsigned long pmap; |
| 381 | |
Paul Jackson | 05486fa | 2008-06-22 07:22:02 -0700 | [diff] [blame] | 382 | #ifdef CONFIG_X86_32 |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 383 | /* Can't handle data above 4GB at this time */ |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 384 | if (e->efi_memmap_hi) { |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 385 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
| 386 | return -EINVAL; |
| 387 | } |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 388 | pmap = e->efi_memmap; |
Paul Jackson | 05486fa | 2008-06-22 07:22:02 -0700 | [diff] [blame] | 389 | #else |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 390 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 391 | #endif |
Borislav Petkov | 15b9c35 | 2013-03-01 17:07:44 +0100 | [diff] [blame] | 392 | memmap.phys_map = (void *)pmap; |
| 393 | memmap.nr_map = e->efi_memmap_size / |
| 394 | e->efi_memdesc_size; |
| 395 | memmap.desc_size = e->efi_memdesc_size; |
| 396 | memmap.desc_version = e->efi_memdesc_version; |
| 397 | |
Tejun Heo | 24aa078 | 2011-07-12 11:16:06 +0200 | [diff] [blame] | 398 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 399 | |
Leif Lindholm | 258f6fd | 2013-09-05 11:34:55 +0100 | [diff] [blame] | 400 | efi.memmap = &memmap; |
| 401 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 402 | return 0; |
Huang, Ying | ecacf09 | 2008-06-02 14:26:21 +0800 | [diff] [blame] | 403 | } |
| 404 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 405 | static void __init print_efi_memmap(void) |
| 406 | { |
Borislav Petkov | f4fccac | 2013-10-31 17:24:59 +0100 | [diff] [blame] | 407 | #ifdef EFI_DEBUG |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 408 | efi_memory_desc_t *md; |
| 409 | void *p; |
| 410 | int i; |
| 411 | |
| 412 | for (p = memmap.map, i = 0; |
| 413 | p < memmap.map_end; |
| 414 | p += memmap.desc_size, i++) { |
| 415 | md = p; |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 416 | pr_info("mem%02u: type=%u, attr=0x%llx, " |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 417 | "range=[0x%016llx-0x%016llx) (%lluMB)\n", |
| 418 | i, md->type, md->attribute, md->phys_addr, |
| 419 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), |
| 420 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); |
| 421 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 422 | #endif /* EFI_DEBUG */ |
Borislav Petkov | f4fccac | 2013-10-31 17:24:59 +0100 | [diff] [blame] | 423 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 424 | |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 425 | void __init efi_reserve_boot_services(void) |
| 426 | { |
| 427 | void *p; |
| 428 | |
| 429 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 430 | efi_memory_desc_t *md = p; |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 431 | u64 start = md->phys_addr; |
| 432 | u64 size = md->num_pages << EFI_PAGE_SHIFT; |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 433 | |
| 434 | if (md->type != EFI_BOOT_SERVICES_CODE && |
| 435 | md->type != EFI_BOOT_SERVICES_DATA) |
| 436 | continue; |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 437 | /* Only reserve where possible: |
| 438 | * - Not within any already allocated areas |
| 439 | * - Not over any memory area (really needed, if above?) |
| 440 | * - Not within any part of the kernel |
| 441 | * - Not the bios reserved area |
| 442 | */ |
Dave Young | a7f84f0 | 2013-12-20 18:02:15 +0800 | [diff] [blame] | 443 | if ((start + size > __pa_symbol(_text) |
Alexander Duyck | fc8d782 | 2012-11-16 13:57:13 -0800 | [diff] [blame] | 444 | && start <= __pa_symbol(_end)) || |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 445 | !e820_all_mapped(start, start+size, E820_RAM) || |
Tejun Heo | bf61549 | 2011-07-12 09:58:05 +0200 | [diff] [blame] | 446 | memblock_is_region_reserved(start, size)) { |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 447 | /* Could not reserve, skip it */ |
| 448 | md->num_pages = 0; |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 449 | memblock_dbg("Could not reserve boot range " |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 450 | "[0x%010llx-0x%010llx]\n", |
| 451 | start, start+size-1); |
| 452 | } else |
Tejun Heo | 24aa078 | 2011-07-12 11:16:06 +0200 | [diff] [blame] | 453 | memblock_reserve(start, size); |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 454 | } |
| 455 | } |
| 456 | |
Olof Johansson | 5189c2a | 2012-10-24 10:00:44 -0700 | [diff] [blame] | 457 | void __init efi_unmap_memmap(void) |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 458 | { |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 459 | clear_bit(EFI_MEMMAP, &x86_efi_facility); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 460 | if (memmap.map) { |
| 461 | early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); |
| 462 | memmap.map = NULL; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | void __init efi_free_boot_services(void) |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 467 | { |
| 468 | void *p; |
| 469 | |
Olof Johansson | 5189c2a | 2012-10-24 10:00:44 -0700 | [diff] [blame] | 470 | if (!efi_is_native()) |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 471 | return; |
| 472 | |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 473 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 474 | efi_memory_desc_t *md = p; |
| 475 | unsigned long long start = md->phys_addr; |
| 476 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; |
| 477 | |
| 478 | if (md->type != EFI_BOOT_SERVICES_CODE && |
| 479 | md->type != EFI_BOOT_SERVICES_DATA) |
| 480 | continue; |
| 481 | |
Maarten Lankhorst | 7d68dc3 | 2011-06-14 19:53:09 +0200 | [diff] [blame] | 482 | /* Could not reserve boot area */ |
| 483 | if (!size) |
| 484 | continue; |
| 485 | |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 486 | free_bootmem_late(start, size); |
| 487 | } |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 488 | |
| 489 | efi_unmap_memmap(); |
Matthew Garrett | 916f676 | 2011-05-25 09:53:13 -0400 | [diff] [blame] | 490 | } |
| 491 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 492 | static int __init efi_systab_init(void *phys) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 493 | { |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 494 | if (efi_enabled(EFI_64BIT)) { |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 495 | efi_system_table_64_t *systab64; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 496 | struct efi_setup_data *data = NULL; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 497 | u64 tmp = 0; |
| 498 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 499 | if (efi_setup) { |
| 500 | data = early_memremap(efi_setup, sizeof(*data)); |
| 501 | if (!data) |
| 502 | return -ENOMEM; |
| 503 | } |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 504 | systab64 = early_ioremap((unsigned long)phys, |
| 505 | sizeof(*systab64)); |
| 506 | if (systab64 == NULL) { |
| 507 | pr_err("Couldn't map the system table!\n"); |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 508 | if (data) |
| 509 | early_iounmap(data, sizeof(*data)); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 510 | return -ENOMEM; |
| 511 | } |
| 512 | |
| 513 | efi_systab.hdr = systab64->hdr; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 514 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
| 515 | systab64->fw_vendor; |
| 516 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 517 | efi_systab.fw_revision = systab64->fw_revision; |
| 518 | efi_systab.con_in_handle = systab64->con_in_handle; |
| 519 | tmp |= systab64->con_in_handle; |
| 520 | efi_systab.con_in = systab64->con_in; |
| 521 | tmp |= systab64->con_in; |
| 522 | efi_systab.con_out_handle = systab64->con_out_handle; |
| 523 | tmp |= systab64->con_out_handle; |
| 524 | efi_systab.con_out = systab64->con_out; |
| 525 | tmp |= systab64->con_out; |
| 526 | efi_systab.stderr_handle = systab64->stderr_handle; |
| 527 | tmp |= systab64->stderr_handle; |
| 528 | efi_systab.stderr = systab64->stderr; |
| 529 | tmp |= systab64->stderr; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 530 | efi_systab.runtime = data ? |
| 531 | (void *)(unsigned long)data->runtime : |
| 532 | (void *)(unsigned long)systab64->runtime; |
| 533 | tmp |= data ? data->runtime : systab64->runtime; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 534 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
| 535 | tmp |= systab64->boottime; |
| 536 | efi_systab.nr_tables = systab64->nr_tables; |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 537 | efi_systab.tables = data ? (unsigned long)data->tables : |
| 538 | systab64->tables; |
| 539 | tmp |= data ? data->tables : systab64->tables; |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 540 | |
| 541 | early_iounmap(systab64, sizeof(*systab64)); |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 542 | if (data) |
| 543 | early_iounmap(data, sizeof(*data)); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 544 | #ifdef CONFIG_X86_32 |
| 545 | if (tmp >> 32) { |
| 546 | pr_err("EFI data located above 4GB, disabling EFI.\n"); |
| 547 | return -EINVAL; |
| 548 | } |
| 549 | #endif |
| 550 | } else { |
| 551 | efi_system_table_32_t *systab32; |
| 552 | |
| 553 | systab32 = early_ioremap((unsigned long)phys, |
| 554 | sizeof(*systab32)); |
| 555 | if (systab32 == NULL) { |
| 556 | pr_err("Couldn't map the system table!\n"); |
| 557 | return -ENOMEM; |
| 558 | } |
| 559 | |
| 560 | efi_systab.hdr = systab32->hdr; |
| 561 | efi_systab.fw_vendor = systab32->fw_vendor; |
| 562 | efi_systab.fw_revision = systab32->fw_revision; |
| 563 | efi_systab.con_in_handle = systab32->con_in_handle; |
| 564 | efi_systab.con_in = systab32->con_in; |
| 565 | efi_systab.con_out_handle = systab32->con_out_handle; |
| 566 | efi_systab.con_out = systab32->con_out; |
| 567 | efi_systab.stderr_handle = systab32->stderr_handle; |
| 568 | efi_systab.stderr = systab32->stderr; |
| 569 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; |
| 570 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; |
| 571 | efi_systab.nr_tables = systab32->nr_tables; |
| 572 | efi_systab.tables = systab32->tables; |
| 573 | |
| 574 | early_iounmap(systab32, sizeof(*systab32)); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 575 | } |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 576 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 577 | efi.systab = &efi_systab; |
| 578 | |
| 579 | /* |
| 580 | * Verify the EFI Table |
| 581 | */ |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 582 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 583 | pr_err("System table signature incorrect!\n"); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 584 | return -EINVAL; |
| 585 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 586 | if ((efi.systab->hdr.revision >> 16) == 0) |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 587 | pr_err("Warning: System table version " |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 588 | "%d.%02d, expected 1.00 or greater!\n", |
| 589 | efi.systab->hdr.revision >> 16, |
| 590 | efi.systab->hdr.revision & 0xffff); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 591 | |
| 592 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 593 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 594 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 595 | static int __init efi_runtime_init(void) |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 596 | { |
| 597 | efi_runtime_services_t *runtime; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 598 | |
| 599 | /* |
| 600 | * Check out the runtime services table. We need to map |
| 601 | * the runtime services table so that we can grab the physical |
| 602 | * address of several of the EFI runtime functions, needed to |
| 603 | * set the firmware into virtual mode. |
| 604 | */ |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 605 | runtime = early_ioremap((unsigned long)efi.systab->runtime, |
| 606 | sizeof(efi_runtime_services_t)); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 607 | if (!runtime) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 608 | pr_err("Could not map the runtime service table!\n"); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 609 | return -ENOMEM; |
| 610 | } |
| 611 | /* |
| 612 | * We will only need *early* access to the following |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 613 | * two EFI runtime services before set_virtual_address_map |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 614 | * is invoked. |
| 615 | */ |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 616 | efi_phys.get_time = (efi_get_time_t *)runtime->get_time; |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 617 | efi_phys.set_virtual_address_map = |
| 618 | (efi_set_virtual_address_map_t *) |
| 619 | runtime->set_virtual_address_map; |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 620 | /* |
| 621 | * Make efi_get_time can be called before entering |
| 622 | * virtual mode. |
| 623 | */ |
| 624 | efi.get_time = phys_efi_get_time; |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 625 | early_iounmap(runtime, sizeof(efi_runtime_services_t)); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 626 | |
| 627 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 628 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 629 | |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 630 | static int __init efi_memmap_init(void) |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 631 | { |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 632 | /* Map the EFI memory map */ |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 633 | memmap.map = early_ioremap((unsigned long)memmap.phys_map, |
| 634 | memmap.nr_map * memmap.desc_size); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 635 | if (memmap.map == NULL) { |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 636 | pr_err("Could not map the memory map!\n"); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 637 | return -ENOMEM; |
| 638 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 639 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
Russ Anderson | 175e438 | 2008-10-02 17:32:06 -0500 | [diff] [blame] | 640 | |
Paul Jackson | 200001e | 2008-06-25 05:44:46 -0700 | [diff] [blame] | 641 | if (add_efi_memmap) |
| 642 | do_add_efi_memmap(); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 643 | |
| 644 | return 0; |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 645 | } |
| 646 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 647 | /* |
| 648 | * A number of config table entries get remapped to virtual addresses |
| 649 | * after entering EFI virtual mode. However, the kexec kernel requires |
| 650 | * their physical addresses therefore we pass them via setup_data and |
| 651 | * correct those entries to their respective physical addresses here. |
| 652 | * |
| 653 | * Currently only handles smbios which is necessary for some firmware |
| 654 | * implementation. |
| 655 | */ |
| 656 | static int __init efi_reuse_config(u64 tables, int nr_tables) |
| 657 | { |
| 658 | int i, sz, ret = 0; |
| 659 | void *p, *tablep; |
| 660 | struct efi_setup_data *data; |
| 661 | |
| 662 | if (!efi_setup) |
| 663 | return 0; |
| 664 | |
| 665 | if (!efi_enabled(EFI_64BIT)) |
| 666 | return 0; |
| 667 | |
| 668 | data = early_memremap(efi_setup, sizeof(*data)); |
| 669 | if (!data) { |
| 670 | ret = -ENOMEM; |
| 671 | goto out; |
| 672 | } |
| 673 | |
| 674 | if (!data->smbios) |
| 675 | goto out_memremap; |
| 676 | |
| 677 | sz = sizeof(efi_config_table_64_t); |
| 678 | |
| 679 | p = tablep = early_memremap(tables, nr_tables * sz); |
| 680 | if (!p) { |
| 681 | pr_err("Could not map Configuration table!\n"); |
| 682 | ret = -ENOMEM; |
| 683 | goto out_memremap; |
| 684 | } |
| 685 | |
| 686 | for (i = 0; i < efi.systab->nr_tables; i++) { |
| 687 | efi_guid_t guid; |
| 688 | |
| 689 | guid = ((efi_config_table_64_t *)p)->guid; |
| 690 | |
| 691 | if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) |
| 692 | ((efi_config_table_64_t *)p)->table = data->smbios; |
| 693 | p += sz; |
| 694 | } |
| 695 | early_iounmap(tablep, nr_tables * sz); |
| 696 | |
| 697 | out_memremap: |
| 698 | early_iounmap(data, sizeof(*data)); |
| 699 | out: |
| 700 | return ret; |
| 701 | } |
| 702 | |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 703 | void __init efi_init(void) |
| 704 | { |
| 705 | efi_char16_t *c16; |
| 706 | char vendor[100] = "unknown"; |
| 707 | int i = 0; |
| 708 | void *tmp; |
| 709 | |
| 710 | #ifdef CONFIG_X86_32 |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 711 | if (boot_params.efi_info.efi_systab_hi || |
| 712 | boot_params.efi_info.efi_memmap_hi) { |
| 713 | pr_info("Table located above 4GB, disabling EFI.\n"); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 714 | return; |
| 715 | } |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 716 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
| 717 | #else |
| 718 | efi_phys.systab = (efi_system_table_t *) |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 719 | (boot_params.efi_info.efi_systab | |
| 720 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 721 | #endif |
| 722 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 723 | if (efi_systab_init(efi_phys.systab)) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 724 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 725 | |
| 726 | set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 727 | |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 728 | efi.config_table = (unsigned long)efi.systab->tables; |
| 729 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; |
| 730 | efi.runtime = (unsigned long)efi.systab->runtime; |
| 731 | |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 732 | /* |
| 733 | * Show what we know for posterity |
| 734 | */ |
| 735 | c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); |
| 736 | if (c16) { |
| 737 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) |
| 738 | vendor[i] = *c16++; |
| 739 | vendor[i] = '\0'; |
| 740 | } else |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 741 | pr_err("Could not map the firmware vendor!\n"); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 742 | early_iounmap(tmp, 2); |
| 743 | |
Olof Johansson | e3cb3f5 | 2012-02-12 13:24:26 -0800 | [diff] [blame] | 744 | pr_info("EFI v%u.%.02u by %s\n", |
| 745 | efi.systab->hdr.revision >> 16, |
| 746 | efi.systab->hdr.revision & 0xffff, vendor); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 747 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 748 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
| 749 | return; |
| 750 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 751 | if (efi_config_init(arch_tables)) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 752 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 753 | |
| 754 | set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); |
Olof Johansson | 83e7ee6 | 2012-02-12 13:24:25 -0800 | [diff] [blame] | 755 | |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 756 | /* |
| 757 | * Note: We currently don't support runtime services on an EFI |
| 758 | * that doesn't match the kernel 32/64-bit mode. |
| 759 | */ |
| 760 | |
Olof Johansson | 5189c2a | 2012-10-24 10:00:44 -0700 | [diff] [blame] | 761 | if (!efi_is_native()) |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 762 | 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] | 763 | else { |
Matt Fleming | fb834c7 | 2013-02-20 20:36:12 +0000 | [diff] [blame] | 764 | if (disable_runtime || efi_runtime_init()) |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 765 | return; |
| 766 | set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 767 | } |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 768 | if (efi_memmap_init()) |
Olof Johansson | 140bf27 | 2012-02-12 13:24:28 -0800 | [diff] [blame] | 769 | return; |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 770 | |
| 771 | set_bit(EFI_MEMMAP, &x86_efi_facility); |
| 772 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 773 | print_efi_memmap(); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 774 | } |
| 775 | |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 776 | void __init efi_late_init(void) |
| 777 | { |
| 778 | efi_bgrt_init(); |
| 779 | } |
| 780 | |
Matthew Garrett | 9cd2b07 | 2011-05-05 15:19:43 -0400 | [diff] [blame] | 781 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
| 782 | { |
| 783 | u64 addr, npages; |
| 784 | |
| 785 | addr = md->virt_addr; |
| 786 | npages = md->num_pages; |
| 787 | |
| 788 | memrange_efi_to_native(&addr, &npages); |
| 789 | |
| 790 | if (executable) |
| 791 | set_memory_x(addr, npages); |
| 792 | else |
| 793 | set_memory_nx(addr, npages); |
| 794 | } |
| 795 | |
Borislav Petkov | c55d016 | 2014-02-14 08:24:24 +0100 | [diff] [blame] | 796 | void __init runtime_code_page_mkexec(void) |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 797 | { |
| 798 | efi_memory_desc_t *md; |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 799 | void *p; |
| 800 | |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 801 | /* Make EFI runtime service code area executable */ |
| 802 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 803 | md = p; |
Huang, Ying | 1c083eb | 2008-02-04 16:48:06 +0100 | [diff] [blame] | 804 | |
| 805 | if (md->type != EFI_RUNTIME_SERVICES_CODE) |
| 806 | continue; |
| 807 | |
Matthew Garrett | 9cd2b07 | 2011-05-05 15:19:43 -0400 | [diff] [blame] | 808 | efi_set_executable(md, true); |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 809 | } |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 810 | } |
Huang, Ying | a2172e2 | 2008-01-30 13:33:55 +0100 | [diff] [blame] | 811 | |
Matt Fleming | 3e8fa26 | 2012-10-19 13:25:46 +0100 | [diff] [blame] | 812 | void efi_memory_uc(u64 addr, unsigned long size) |
| 813 | { |
| 814 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; |
| 815 | u64 npages; |
| 816 | |
| 817 | npages = round_up(size, page_shift) / page_shift; |
| 818 | memrange_efi_to_native(&addr, &npages); |
| 819 | set_memory_uc(addr, npages); |
| 820 | } |
| 821 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 822 | void __init old_map_region(efi_memory_desc_t *md) |
| 823 | { |
| 824 | u64 start_pfn, end_pfn, end; |
| 825 | unsigned long size; |
| 826 | void *va; |
| 827 | |
| 828 | start_pfn = PFN_DOWN(md->phys_addr); |
| 829 | size = md->num_pages << PAGE_SHIFT; |
| 830 | end = md->phys_addr + size; |
| 831 | end_pfn = PFN_UP(end); |
| 832 | |
| 833 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { |
| 834 | va = __va(md->phys_addr); |
| 835 | |
| 836 | if (!(md->attribute & EFI_MEMORY_WB)) |
| 837 | efi_memory_uc((u64)(unsigned long)va, size); |
| 838 | } else |
| 839 | va = efi_ioremap(md->phys_addr, size, |
| 840 | md->type, md->attribute); |
| 841 | |
| 842 | md->virt_addr = (u64) (unsigned long) va; |
| 843 | if (!va) |
| 844 | pr_err("ioremap of 0x%llX failed!\n", |
| 845 | (unsigned long long)md->phys_addr); |
| 846 | } |
| 847 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 848 | /* Merge contiguous regions of the same type and attribute */ |
| 849 | static void __init efi_merge_regions(void) |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 850 | { |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 851 | void *p; |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 852 | efi_memory_desc_t *md, *prev_md = NULL; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 853 | |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 854 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 855 | u64 prev_size; |
| 856 | md = p; |
| 857 | |
| 858 | if (!prev_md) { |
| 859 | prev_md = md; |
| 860 | continue; |
| 861 | } |
| 862 | |
| 863 | if (prev_md->type != md->type || |
| 864 | prev_md->attribute != md->attribute) { |
| 865 | prev_md = md; |
| 866 | continue; |
| 867 | } |
| 868 | |
| 869 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; |
| 870 | |
| 871 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { |
| 872 | prev_md->num_pages += md->num_pages; |
| 873 | md->type = EFI_RESERVED_TYPE; |
| 874 | md->attribute = 0; |
| 875 | continue; |
| 876 | } |
| 877 | prev_md = md; |
| 878 | } |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 879 | } |
| 880 | |
| 881 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) |
| 882 | { |
| 883 | unsigned long size; |
| 884 | u64 end, systab; |
| 885 | |
| 886 | size = md->num_pages << EFI_PAGE_SHIFT; |
| 887 | end = md->phys_addr + size; |
| 888 | systab = (u64)(unsigned long)efi_phys.systab; |
| 889 | if (md->phys_addr <= systab && systab < end) { |
| 890 | systab += md->virt_addr - md->phys_addr; |
| 891 | efi.systab = (efi_system_table_t *)(unsigned long)systab; |
| 892 | } |
| 893 | } |
| 894 | |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 895 | static int __init save_runtime_map(void) |
| 896 | { |
| 897 | efi_memory_desc_t *md; |
| 898 | void *tmp, *p, *q = NULL; |
| 899 | int count = 0; |
| 900 | |
| 901 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 902 | md = p; |
| 903 | |
| 904 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || |
| 905 | (md->type == EFI_BOOT_SERVICES_CODE) || |
| 906 | (md->type == EFI_BOOT_SERVICES_DATA)) |
| 907 | continue; |
| 908 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); |
| 909 | if (!tmp) |
| 910 | goto out; |
| 911 | q = tmp; |
| 912 | |
| 913 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); |
| 914 | count++; |
| 915 | } |
| 916 | |
Matt Fleming | 518548a | 2013-12-21 16:09:46 +0000 | [diff] [blame] | 917 | efi_runtime_map_setup(q, count, memmap.desc_size); |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 918 | |
| 919 | return 0; |
| 920 | out: |
| 921 | kfree(q); |
| 922 | return -ENOMEM; |
| 923 | } |
| 924 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 925 | /* |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 926 | * Map efi regions which were passed via setup_data. The virt_addr is a fixed |
| 927 | * addr which was used in first kernel of a kexec boot. |
| 928 | */ |
| 929 | static void __init efi_map_regions_fixed(void) |
| 930 | { |
| 931 | void *p; |
| 932 | efi_memory_desc_t *md; |
| 933 | |
| 934 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 935 | md = p; |
| 936 | efi_map_region_fixed(md); /* FIXME: add error handling */ |
| 937 | get_systab_virt_addr(md); |
| 938 | } |
| 939 | |
| 940 | } |
| 941 | |
| 942 | /* |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 943 | * Map efi memory ranges for runtime serivce and update new_memmap with virtual |
| 944 | * addresses. |
| 945 | */ |
| 946 | static void * __init efi_map_regions(int *count) |
| 947 | { |
| 948 | efi_memory_desc_t *md; |
| 949 | void *p, *tmp, *new_memmap = NULL; |
Matthew Garrett | 202f9d0 | 2011-05-05 15:19:44 -0400 | [diff] [blame] | 950 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 951 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 952 | md = p; |
Josh Boyer | 7008701 | 2013-04-18 07:51:34 -0700 | [diff] [blame] | 953 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
| 954 | #ifdef CONFIG_X86_64 |
| 955 | if (md->type != EFI_BOOT_SERVICES_CODE && |
| 956 | md->type != EFI_BOOT_SERVICES_DATA) |
| 957 | #endif |
| 958 | continue; |
| 959 | } |
Huang, Ying | 1c083eb | 2008-02-04 16:48:06 +0100 | [diff] [blame] | 960 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 961 | efi_map_region(md); |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 962 | get_systab_virt_addr(md); |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 963 | |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 964 | tmp = krealloc(new_memmap, (*count + 1) * memmap.desc_size, |
| 965 | GFP_KERNEL); |
| 966 | if (!tmp) |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 967 | goto out; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 968 | new_memmap = tmp; |
| 969 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
Matthew Garrett | 7cb00b7 | 2011-05-05 15:19:45 -0400 | [diff] [blame] | 970 | memmap.desc_size); |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 971 | (*count)++; |
| 972 | } |
| 973 | |
| 974 | return new_memmap; |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 975 | out: |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 976 | kfree(new_memmap); |
| 977 | return NULL; |
| 978 | } |
| 979 | |
| 980 | /* |
| 981 | * This function will switch the EFI runtime services to virtual mode. |
| 982 | * Essentially, we look through the EFI memmap and map every region that |
| 983 | * has the runtime attribute bit set in its memory descriptor into the |
| 984 | * ->trampoline_pgd page table using a top-down VA allocation scheme. |
| 985 | * |
| 986 | * The old method which used to update that memory descriptor with the |
| 987 | * virtual address obtained from ioremap() is still supported when the |
| 988 | * kernel is booted with efi=old_map on its command line. Same old |
| 989 | * method enabled the runtime services to be called without having to |
| 990 | * thunk back into physical mode for every invocation. |
| 991 | * |
| 992 | * The new method does a pagetable switch in a preemption-safe manner |
| 993 | * so that we're in a different address space when calling a runtime |
| 994 | * function. For function arguments passing we do copy the PGDs of the |
| 995 | * kernel page table into ->trampoline_pgd prior to each call. |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 996 | * |
| 997 | * Specially for kexec boot, efi runtime maps in previous kernel should |
| 998 | * be passed in via setup_data. In that case runtime ranges will be mapped |
| 999 | * to the same virtual addresses as the first kernel. |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 1000 | */ |
| 1001 | void __init efi_enter_virtual_mode(void) |
| 1002 | { |
| 1003 | efi_status_t status; |
| 1004 | void *new_memmap = NULL; |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 1005 | int err, count = 0; |
Dave Young | 481f75c | 2013-12-20 18:02:16 +0800 | [diff] [blame] | 1006 | |
| 1007 | efi.systab = NULL; |
| 1008 | |
| 1009 | /* |
| 1010 | * We don't do virtual mode, since we don't do runtime services, on |
| 1011 | * non-native EFI |
| 1012 | */ |
| 1013 | if (!efi_is_native()) { |
| 1014 | efi_unmap_memmap(); |
| 1015 | return; |
| 1016 | } |
| 1017 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 1018 | if (efi_setup) { |
| 1019 | efi_map_regions_fixed(); |
| 1020 | } else { |
| 1021 | efi_merge_regions(); |
| 1022 | new_memmap = efi_map_regions(&count); |
| 1023 | if (!new_memmap) { |
| 1024 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); |
| 1025 | return; |
| 1026 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1027 | } |
| 1028 | |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 1029 | err = save_runtime_map(); |
| 1030 | if (err) |
| 1031 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
| 1032 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1033 | BUG_ON(!efi.systab); |
| 1034 | |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 1035 | efi_setup_page_tables(); |
| 1036 | efi_sync_low_kernel_mappings(); |
| 1037 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 1038 | if (!efi_setup) { |
| 1039 | status = phys_efi_set_virtual_address_map( |
| 1040 | memmap.desc_size * count, |
| 1041 | memmap.desc_size, |
| 1042 | memmap.desc_version, |
| 1043 | (efi_memory_desc_t *)__pa(new_memmap)); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1044 | |
Dave Young | 1fec053 | 2013-12-20 18:02:19 +0800 | [diff] [blame] | 1045 | if (status != EFI_SUCCESS) { |
| 1046 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", |
| 1047 | status); |
| 1048 | panic("EFI call to SetVirtualAddressMap() failed!"); |
| 1049 | } |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * Now that EFI is in virtual mode, update the function |
| 1054 | * pointers in the runtime service table to the new virtual addresses. |
| 1055 | * |
| 1056 | * Call EFI services through wrapper functions. |
| 1057 | */ |
Matt Fleming | 712ba9e | 2013-01-25 10:07:25 +0000 | [diff] [blame] | 1058 | efi.runtime_version = efi_systab.hdr.revision; |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1059 | efi.get_time = virt_efi_get_time; |
| 1060 | efi.set_time = virt_efi_set_time; |
| 1061 | efi.get_wakeup_time = virt_efi_get_wakeup_time; |
| 1062 | efi.set_wakeup_time = virt_efi_set_wakeup_time; |
| 1063 | efi.get_variable = virt_efi_get_variable; |
| 1064 | efi.get_next_variable = virt_efi_get_next_variable; |
| 1065 | efi.set_variable = virt_efi_set_variable; |
| 1066 | efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; |
| 1067 | efi.reset_system = virt_efi_reset_system; |
Matthew Garrett | 2b5e8ef | 2011-05-05 15:19:42 -0400 | [diff] [blame] | 1068 | efi.set_virtual_address_map = NULL; |
Matthew Garrett | 3b37023 | 2011-06-06 15:36:25 -0400 | [diff] [blame] | 1069 | efi.query_variable_info = virt_efi_query_variable_info; |
| 1070 | efi.update_capsule = virt_efi_update_capsule; |
| 1071 | efi.query_capsule_caps = virt_efi_query_capsule_caps; |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 1072 | |
Borislav Petkov | c55d016 | 2014-02-14 08:24:24 +0100 | [diff] [blame] | 1073 | efi_runtime_mkexec(); |
Olof Johansson | 1adbfa3 | 2012-02-12 13:24:29 -0800 | [diff] [blame] | 1074 | |
Matthew Garrett | 7cb00b7 | 2011-05-05 15:19:45 -0400 | [diff] [blame] | 1075 | kfree(new_memmap); |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1076 | |
| 1077 | /* clean DUMMY object */ |
| 1078 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, |
| 1079 | EFI_VARIABLE_NON_VOLATILE | |
| 1080 | EFI_VARIABLE_BOOTSERVICE_ACCESS | |
| 1081 | EFI_VARIABLE_RUNTIME_ACCESS, |
| 1082 | 0, NULL); |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * Convenience functions to obtain memory types and attributes |
| 1087 | */ |
| 1088 | u32 efi_mem_type(unsigned long phys_addr) |
| 1089 | { |
| 1090 | efi_memory_desc_t *md; |
| 1091 | void *p; |
| 1092 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 1093 | if (!efi_enabled(EFI_MEMMAP)) |
| 1094 | return 0; |
| 1095 | |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 1096 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 1097 | md = p; |
| 1098 | if ((md->phys_addr <= phys_addr) && |
| 1099 | (phys_addr < (md->phys_addr + |
| 1100 | (md->num_pages << EFI_PAGE_SHIFT)))) |
| 1101 | return md->type; |
| 1102 | } |
| 1103 | return 0; |
| 1104 | } |
| 1105 | |
| 1106 | u64 efi_mem_attributes(unsigned long phys_addr) |
| 1107 | { |
| 1108 | efi_memory_desc_t *md; |
| 1109 | void *p; |
| 1110 | |
| 1111 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
| 1112 | md = p; |
| 1113 | if ((md->phys_addr <= phys_addr) && |
| 1114 | (phys_addr < (md->phys_addr + |
| 1115 | (md->num_pages << EFI_PAGE_SHIFT)))) |
| 1116 | return md->attribute; |
| 1117 | } |
| 1118 | return 0; |
| 1119 | } |
Matt Fleming | a6e4d5a | 2013-03-25 09:14:30 +0000 | [diff] [blame] | 1120 | |
| 1121 | /* |
| 1122 | * Some firmware has serious problems when using more than 50% of the EFI |
| 1123 | * variable store, i.e. it triggers bugs that can brick machines. Ensure that |
| 1124 | * we never use more than this safe limit. |
| 1125 | * |
| 1126 | * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable |
| 1127 | * store. |
| 1128 | */ |
| 1129 | efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) |
| 1130 | { |
| 1131 | efi_status_t status; |
| 1132 | u64 storage_size, remaining_size, max_size; |
| 1133 | |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1134 | if (!(attributes & EFI_VARIABLE_NON_VOLATILE)) |
| 1135 | return 0; |
| 1136 | |
Matt Fleming | a6e4d5a | 2013-03-25 09:14:30 +0000 | [diff] [blame] | 1137 | status = efi.query_variable_info(attributes, &storage_size, |
| 1138 | &remaining_size, &max_size); |
| 1139 | if (status != EFI_SUCCESS) |
| 1140 | return status; |
| 1141 | |
Matthew Garrett | 31ff2f2 | 2013-04-15 13:09:47 -0700 | [diff] [blame] | 1142 | /* |
| 1143 | * Some firmware implementations refuse to boot if there's insufficient |
| 1144 | * space in the variable store. We account for that by refusing the |
| 1145 | * write if permitting it would reduce the available space to under |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1146 | * 5KB. This figure was provided by Samsung, so should be safe. |
Matthew Garrett | 31ff2f2 | 2013-04-15 13:09:47 -0700 | [diff] [blame] | 1147 | */ |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1148 | if ((remaining_size - size < EFI_MIN_RESERVE) && |
| 1149 | !efi_no_storage_paranoia) { |
Richard Weinberger | 7791c84 | 2013-04-10 10:59:34 +0200 | [diff] [blame] | 1150 | |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1151 | /* |
| 1152 | * Triggering garbage collection may require that the firmware |
| 1153 | * generate a real EFI_OUT_OF_RESOURCES error. We can force |
| 1154 | * that by attempting to use more space than is available. |
| 1155 | */ |
| 1156 | unsigned long dummy_size = remaining_size + 1024; |
Ben Hutchings | b8cb62f | 2013-06-16 21:27:12 +0100 | [diff] [blame] | 1157 | void *dummy = kzalloc(dummy_size, GFP_ATOMIC); |
| 1158 | |
| 1159 | if (!dummy) |
| 1160 | return EFI_OUT_OF_RESOURCES; |
Richard Weinberger | 8c58bf3 | 2013-04-17 01:00:53 +0200 | [diff] [blame] | 1161 | |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1162 | status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, |
| 1163 | EFI_VARIABLE_NON_VOLATILE | |
| 1164 | EFI_VARIABLE_BOOTSERVICE_ACCESS | |
| 1165 | EFI_VARIABLE_RUNTIME_ACCESS, |
| 1166 | dummy_size, dummy); |
| 1167 | |
| 1168 | if (status == EFI_SUCCESS) { |
| 1169 | /* |
| 1170 | * This should have failed, so if it didn't make sure |
| 1171 | * that we delete it... |
| 1172 | */ |
| 1173 | efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, |
| 1174 | EFI_VARIABLE_NON_VOLATILE | |
| 1175 | EFI_VARIABLE_BOOTSERVICE_ACCESS | |
| 1176 | EFI_VARIABLE_RUNTIME_ACCESS, |
| 1177 | 0, dummy); |
| 1178 | } |
| 1179 | |
Ben Hutchings | b8cb62f | 2013-06-16 21:27:12 +0100 | [diff] [blame] | 1180 | kfree(dummy); |
| 1181 | |
Matthew Garrett | f8b8404 | 2013-06-01 16:06:20 -0400 | [diff] [blame] | 1182 | /* |
| 1183 | * The runtime code may now have triggered a garbage collection |
| 1184 | * run, so check the variable info again |
| 1185 | */ |
| 1186 | status = efi.query_variable_info(attributes, &storage_size, |
| 1187 | &remaining_size, &max_size); |
| 1188 | |
| 1189 | if (status != EFI_SUCCESS) |
| 1190 | return status; |
| 1191 | |
| 1192 | /* |
| 1193 | * There still isn't enough room, so return an error |
| 1194 | */ |
| 1195 | if (remaining_size - size < EFI_MIN_RESERVE) |
| 1196 | return EFI_OUT_OF_RESOURCES; |
| 1197 | } |
Matt Fleming | a6e4d5a | 2013-03-25 09:14:30 +0000 | [diff] [blame] | 1198 | |
| 1199 | return EFI_SUCCESS; |
| 1200 | } |
Sergey Vlasov | 3668011 | 2013-04-16 18:31:09 +0400 | [diff] [blame] | 1201 | EXPORT_SYMBOL_GPL(efi_query_variable_store); |
Borislav Petkov | d2f7cbe | 2013-10-31 17:25:08 +0100 | [diff] [blame] | 1202 | |
| 1203 | static int __init parse_efi_cmdline(char *str) |
| 1204 | { |
| 1205 | if (*str == '=') |
| 1206 | str++; |
| 1207 | |
| 1208 | if (!strncmp(str, "old_map", 7)) |
| 1209 | set_bit(EFI_OLD_MEMMAP, &x86_efi_facility); |
| 1210 | |
| 1211 | return 0; |
| 1212 | } |
| 1213 | early_param("efi", parse_efi_cmdline); |
Borislav Petkov | a5d90c9 | 2014-03-04 17:02:17 +0100 | [diff] [blame] | 1214 | |
| 1215 | void __init efi_apply_memmap_quirks(void) |
| 1216 | { |
| 1217 | /* |
| 1218 | * Once setup is done earlier, unmap the EFI memory map on mismatched |
| 1219 | * firmware/kernel architectures since there is no support for runtime |
| 1220 | * services. |
| 1221 | */ |
| 1222 | if (!efi_is_native()) { |
| 1223 | pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n"); |
| 1224 | efi_unmap_memmap(); |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * UV doesn't support the new EFI pagetable mapping yet. |
| 1229 | */ |
| 1230 | if (is_uv_system()) |
| 1231 | set_bit(EFI_OLD_MEMMAP, &x86_efi_facility); |
| 1232 | } |