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efi: split off remapping code from efi_config_init()

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Split of the remapping code from efi_config_init() so that the caller
can perform its own remapping. This is necessary to correctly handle
virtually remapped UEFI memory regions under kexec, as efi.systab will
have been updated to a virtual address.

Acked-by: Matt Fleming <matt.fleming@intel.com>
Tested-by: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Ard Biesheuvel
2014-10-18 15:04:15 +02:00
parent 8ce837cee8
commit 7bb68410ef
2 changed files with 46 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/firmware/efi/efi.c
View File

@@ -293,10 +293,49 @@ static __init int match_config_table(efi_guid_t *guid,
return 0; return 0;
} }
int __init efi_config_parse_tables(void *config_tables, int count, int sz,
efi_config_table_type_t *arch_tables)
{
void *tablep;
int i;
tablep = config_tables;
pr_info("");
for (i = 0; i < count; i++) {
efi_guid_t guid;
unsigned long table;
if (efi_enabled(EFI_64BIT)) {
u64 table64;
guid = ((efi_config_table_64_t *)tablep)->guid;
table64 = ((efi_config_table_64_t *)tablep)->table;
table = table64;
#ifndef CONFIG_64BIT
if (table64 >> 32) {
pr_cont("\n");
pr_err("Table located above 4GB, disabling EFI.\n");
return -EINVAL;
}
#endif
} else {
guid = ((efi_config_table_32_t *)tablep)->guid;
table = ((efi_config_table_32_t *)tablep)->table;
}
if (!match_config_table(&guid, table, common_tables))
match_config_table(&guid, table, arch_tables);
tablep += sz;
}
pr_cont("\n");
set_bit(EFI_CONFIG_TABLES, &efi.flags);
return 0;
}
int __init efi_config_init(efi_config_table_type_t *arch_tables) int __init efi_config_init(efi_config_table_type_t *arch_tables)
{ {
void *config_tables, *tablep; void *config_tables;
int i, sz; int sz, ret;
if (efi_enabled(EFI_64BIT)) if (efi_enabled(EFI_64BIT))
sz = sizeof(efi_config_table_64_t); sz = sizeof(efi_config_table_64_t);
@@ -313,42 +352,11 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
return -ENOMEM; return -ENOMEM;
} }
tablep = config_tables; ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz,
pr_info(""); arch_tables);
for (i = 0; i < efi.systab->nr_tables; i++) {
efi_guid_t guid;
unsigned long table;
if (efi_enabled(EFI_64BIT)) {
u64 table64;
guid = ((efi_config_table_64_t *)tablep)->guid;
table64 = ((efi_config_table_64_t *)tablep)->table;
table = table64;
#ifndef CONFIG_64BIT
if (table64 >> 32) {
pr_cont("\n");
pr_err("Table located above 4GB, disabling EFI.\n");
early_memunmap(config_tables,
efi.systab->nr_tables * sz);
return -EINVAL;
}
#endif
} else {
guid = ((efi_config_table_32_t *)tablep)->guid;
table = ((efi_config_table_32_t *)tablep)->table;
}
if (!match_config_table(&guid, table, common_tables))
match_config_table(&guid, table, arch_tables);
tablep += sz;
}
pr_cont("\n");
early_memunmap(config_tables, efi.systab->nr_tables * sz); early_memunmap(config_tables, efi.systab->nr_tables * sz);
return ret;
set_bit(EFI_CONFIG_TABLES, &efi.flags);
return 0;
} }
#ifdef CONFIG_EFI_VARS_MODULE #ifdef CONFIG_EFI_VARS_MODULE

2
include/linux/efi.h
View File

@@ -875,6 +875,8 @@ static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned lon
#endif #endif
extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr); extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
extern int efi_config_init(efi_config_table_type_t *arch_tables); extern int efi_config_init(efi_config_table_type_t *arch_tables);
extern int efi_config_parse_tables(void *config_tables, int count, int sz,
efi_config_table_type_t *arch_tables);
extern u64 efi_get_iobase (void); extern u64 efi_get_iobase (void);
extern u32 efi_mem_type (unsigned long phys_addr); extern u32 efi_mem_type (unsigned long phys_addr);
extern u64 efi_mem_attributes (unsigned long phys_addr); extern u64 efi_mem_attributes (unsigned long phys_addr);