efi: Add support for the EFI_MEMORY_ATTRIBUTES_TABLE config table
This declares the GUID and struct typedef for the new memory attributes
table which contains the permissions that can be used to apply stricter
permissions to UEFI Runtime Services memory regions.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-13-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index f7d36c6..583e647 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -43,6 +43,7 @@
.config_table = EFI_INVALID_TABLE_ADDR,
.esrt = EFI_INVALID_TABLE_ADDR,
.properties_table = EFI_INVALID_TABLE_ADDR,
+ .mem_attr_table = EFI_INVALID_TABLE_ADDR,
};
EXPORT_SYMBOL(efi);
@@ -338,6 +339,7 @@
{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
{EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
{EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
+ {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
{NULL_GUID, NULL, NULL},
};
diff --git a/include/linux/efi.h b/include/linux/efi.h
index c2c0da4..81af5fe 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -623,6 +623,10 @@
EFI_GUID(0x3152bca5, 0xeade, 0x433d, \
0x86, 0x2e, 0xc0, 0x1c, 0xdc, 0x29, 0x1f, 0x44)
+#define EFI_MEMORY_ATTRIBUTES_TABLE_GUID \
+ EFI_GUID(0xdcfa911d, 0x26eb, 0x469f, \
+ 0xa2, 0x20, 0x38, 0xb7, 0xdc, 0x46, 0x12, 0x20)
+
typedef struct {
efi_guid_t guid;
u64 table;
@@ -847,6 +851,14 @@
#define EFI_INVALID_TABLE_ADDR (~0UL)
+typedef struct {
+ u32 version;
+ u32 num_entries;
+ u32 desc_size;
+ u32 reserved;
+ efi_memory_desc_t entry[0];
+} efi_memory_attributes_table_t;
+
/*
* All runtime access to EFI goes through this structure:
*/
@@ -868,6 +880,7 @@
unsigned long config_table; /* config tables */
unsigned long esrt; /* ESRT table */
unsigned long properties_table; /* properties table */
+ unsigned long mem_attr_table; /* memory attributes table */
efi_get_time_t *get_time;
efi_set_time_t *set_time;
efi_get_wakeup_time_t *get_wakeup_time;