efi: Add support for UEFIv2.5 Properties table

Version 2.5 of the UEFI spec introduces a new configuration table
called the 'EFI Properties table'. Currently, it is only used to
convey whether the Memory Protection feature is enabled, which splits
PE/COFF images into separate code and data memory regions.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 278d4d8..c297d78 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -26,20 +26,21 @@
 #include <linux/platform_device.h>
 
 struct efi __read_mostly efi = {
-       .mps        = EFI_INVALID_TABLE_ADDR,
-       .acpi       = EFI_INVALID_TABLE_ADDR,
-       .acpi20     = EFI_INVALID_TABLE_ADDR,
-       .smbios     = EFI_INVALID_TABLE_ADDR,
-       .smbios3    = EFI_INVALID_TABLE_ADDR,
-       .sal_systab = EFI_INVALID_TABLE_ADDR,
-       .boot_info  = EFI_INVALID_TABLE_ADDR,
-       .hcdp       = EFI_INVALID_TABLE_ADDR,
-       .uga        = EFI_INVALID_TABLE_ADDR,
-       .uv_systab  = EFI_INVALID_TABLE_ADDR,
-       .fw_vendor  = EFI_INVALID_TABLE_ADDR,
-       .runtime    = EFI_INVALID_TABLE_ADDR,
-       .config_table  = EFI_INVALID_TABLE_ADDR,
-       .esrt       = EFI_INVALID_TABLE_ADDR,
+       .mps                    = EFI_INVALID_TABLE_ADDR,
+       .acpi                   = EFI_INVALID_TABLE_ADDR,
+       .acpi20                 = EFI_INVALID_TABLE_ADDR,
+       .smbios                 = EFI_INVALID_TABLE_ADDR,
+       .smbios3                = EFI_INVALID_TABLE_ADDR,
+       .sal_systab             = EFI_INVALID_TABLE_ADDR,
+       .boot_info              = EFI_INVALID_TABLE_ADDR,
+       .hcdp                   = EFI_INVALID_TABLE_ADDR,
+       .uga                    = EFI_INVALID_TABLE_ADDR,
+       .uv_systab              = EFI_INVALID_TABLE_ADDR,
+       .fw_vendor              = EFI_INVALID_TABLE_ADDR,
+       .runtime                = EFI_INVALID_TABLE_ADDR,
+       .config_table           = EFI_INVALID_TABLE_ADDR,
+       .esrt                   = EFI_INVALID_TABLE_ADDR,
+       .properties_table       = EFI_INVALID_TABLE_ADDR,
 };
 EXPORT_SYMBOL(efi);
 
@@ -365,6 +366,7 @@ static __initdata efi_config_table_type_t common_tables[] = {
        {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
        {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
        {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
+       {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
        {NULL_GUID, NULL, NULL},
 };
 

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 4677d8a..d6a9bee 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -596,6 +596,9 @@ void efi_native_runtime_setup(void);
 #define DEVICE_TREE_GUID \
     EFI_GUID(  0xb1b621d5, 0xf19c, 0x41a5, 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 )
 
+#define EFI_PROPERTIES_TABLE_GUID \
+    EFI_GUID(  0x880aaca3, 0x4adc, 0x4a04, 0x90, 0x79, 0xb7, 0x47, 0x34, 0x08, 0x25, 0xe5 )
+
 typedef struct {
        efi_guid_t guid;
        u64 table;
@@ -809,6 +812,15 @@ typedef struct _efi_file_io_interface {
 #define EFI_FILE_MODE_WRITE    0x0000000000000002
 #define EFI_FILE_MODE_CREATE   0x8000000000000000
 
+typedef struct {
+       u32 version;
+       u32 length;
+       u64 memory_protection_attribute;
+} efi_properties_table_t;
+
+#define EFI_PROPERTIES_TABLE_VERSION   0x00010000
+#define EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA        0x1
+
 #define EFI_INVALID_TABLE_ADDR         (~0UL)
 
 /*
@@ -831,6 +843,7 @@ extern struct efi {
        unsigned long runtime;          /* runtime table */
        unsigned long config_table;     /* config tables */
        unsigned long esrt;             /* ESRT table */
+       unsigned long properties_table; /* properties table */
        efi_get_time_t *get_time;
        efi_set_time_t *set_time;
        efi_get_wakeup_time_t *get_wakeup_time;