diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2015-09-23 17:29:34 +0300 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2015-10-12 16:20:07 +0300 |
| commit | a1041713349d0b823b492d7b4ea4325d0b5666db (patch) | |
| tree | f55fd0b6c63da4d6b96e88262b013c04ea86f193 /drivers/firmware | |
| parent | bf924863c9445174c6e118f723dc477e2b6ccc7e (diff) | |
| download | linux-a1041713349d0b823b492d7b4ea4325d0b5666db.tar.xz | |
efi: Introduce EFI_NX_PE_DATA bit and set it from properties table
UEFI v2.5 introduces a runtime memory protection feature that splits
PE/COFF runtime images into separate code and data regions. Since this
may require special handling by the OS, allocate a EFI_xxx bit to
keep track of whether this feature is currently active or not.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/efi.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index c297d78f50fd..31fc864eb037 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -426,6 +426,24 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, } pr_cont("\n"); set_bit(EFI_CONFIG_TABLES, &efi.flags); + + /* Parse the EFI Properties table if it exists */ + if (efi.properties_table != EFI_INVALID_TABLE_ADDR) { + efi_properties_table_t *tbl; + + tbl = early_memremap(efi.properties_table, sizeof(*tbl)); + if (tbl == NULL) { + pr_err("Could not map Properties table!\n"); + return -ENOMEM; + } + + if (tbl->memory_protection_attribute & + EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) + set_bit(EFI_NX_PE_DATA, &efi.flags); + + early_memunmap(tbl, sizeof(*tbl)); + } + return 0; } |