efi: libstub: declare DXE services table

UEFI DXE services are not yet used in kernel code
but are required to manipulate page table memory
protection flags.

Add required declarations to use DXE services functions.

Signed-off-by: Baskov Evgeniy <baskov@ispras.ru>
Link: https://lore.kernel.org/r/20220303142120.1975-2-baskov@ispras.ru
[ardb: ignore absent DXE table but warn if the signature check fails]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 98938a68251cc49fc755328edea827fbe52d11df..bed74a0f2932dfdba626b239baddfbd07d06494f 100644 (file)
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -357,6 +357,11 @@ static inline u32 efi64_convert_status(efi_status_t status)
                                                   runtime),            \
                                    func, __VA_ARGS__))
 
+#define efi_dxe_call(func, ...)                                                \
+       (efi_is_native()                                                \
+               ? efi_dxe_table->func(__VA_ARGS__)                      \
+               : __efi64_thunk_map(efi_dxe_table, func, __VA_ARGS__))
+
 #else /* CONFIG_EFI_MIXED */
 
 static inline bool efi_is_64bit(void)

diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index edb77b0621ea3f5da7a2f2a0f2bd066c1925210d..2dc24776899a6d062ac84d201d545172792ffcb9 100644 (file)
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -36,6 +36,9 @@ extern bool efi_novamap;
 
 extern const efi_system_table_t *efi_system_table;
 
+typedef union efi_dxe_services_table efi_dxe_services_table_t;
+extern const efi_dxe_services_table_t *efi_dxe_table;
+
 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
                                   efi_system_table_t *sys_table_arg);
 
@@ -44,6 +47,7 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 #define efi_is_native()                (true)
 #define efi_bs_call(func, ...) efi_system_table->boottime->func(__VA_ARGS__)
 #define efi_rt_call(func, ...) efi_system_table->runtime->func(__VA_ARGS__)
+#define efi_dxe_call(func, ...)        efi_dxe_table->func(__VA_ARGS__)
 #define efi_table_attr(inst, attr)     (inst->attr)
 #define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
 
@@ -329,6 +333,76 @@ union efi_boot_services {
        } mixed_mode;
 };
 
+typedef enum {
+       EfiGcdMemoryTypeNonExistent,
+       EfiGcdMemoryTypeReserved,
+       EfiGcdMemoryTypeSystemMemory,
+       EfiGcdMemoryTypeMemoryMappedIo,
+       EfiGcdMemoryTypePersistent,
+       EfiGcdMemoryTypeMoreReliable,
+       EfiGcdMemoryTypeMaximum
+} efi_gcd_memory_type_t;
+
+typedef struct {
+       efi_physical_addr_t base_address;
+       u64 length;
+       u64 capabilities;
+       u64 attributes;
+       efi_gcd_memory_type_t gcd_memory_type;
+       void *image_handle;
+       void *device_handle;
+} efi_gcd_memory_space_desc_t;
+
+/*
+ * EFI DXE Services table
+ */
+union efi_dxe_services_table {
+       struct {
+               efi_table_hdr_t hdr;
+               void *add_memory_space;
+               void *allocate_memory_space;
+               void *free_memory_space;
+               void *remove_memory_space;
+               efi_status_t (__efiapi *get_memory_space_descriptor)(efi_physical_addr_t,
+                                                                    efi_gcd_memory_space_desc_t *);
+               efi_status_t (__efiapi *set_memory_space_attributes)(efi_physical_addr_t,
+                                                                    u64, u64);
+               void *get_memory_space_map;
+               void *add_io_space;
+               void *allocate_io_space;
+               void *free_io_space;
+               void *remove_io_space;
+               void *get_io_space_descriptor;
+               void *get_io_space_map;
+               void *dispatch;
+               void *schedule;
+               void *trust;
+               void *process_firmware_volume;
+               void *set_memory_space_capabilities;
+       };
+       struct {
+               efi_table_hdr_t hdr;
+               u32 add_memory_space;
+               u32 allocate_memory_space;
+               u32 free_memory_space;
+               u32 remove_memory_space;
+               u32 get_memory_space_descriptor;
+               u32 set_memory_space_attributes;
+               u32 get_memory_space_map;
+               u32 add_io_space;
+               u32 allocate_io_space;
+               u32 free_io_space;
+               u32 remove_io_space;
+               u32 get_io_space_descriptor;
+               u32 get_io_space_map;
+               u32 dispatch;
+               u32 schedule;
+               u32 trust;
+               u32 process_firmware_volume;
+               u32 set_memory_space_capabilities;
+       } mixed_mode;
+};
+
 typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;
 
 union efi_uga_draw_protocol {

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index 01ddd4502e28a116f553ffb5b3383e76def9fded..cda60aba2f123e51b9ca5982ee7ad8ed381b3c80 100644 (file)
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -22,6 +22,7 @@
 #define MAXMEM_X86_64_4LEVEL (1ull << 46)
 
 const efi_system_table_t *efi_system_table;
+const efi_dxe_services_table_t *efi_dxe_table;
 extern u32 image_offset;
 static efi_loaded_image_t *image = NULL;
 
@@ -677,11 +678,17 @@ unsigned long efi_main(efi_handle_t handle,
        efi_status_t status;
 
        efi_system_table = sys_table_arg;
-
        /* Check if we were booted by the EFI firmware */
        if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
                efi_exit(handle, EFI_INVALID_PARAMETER);
 
+       efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID);
+       if (efi_dxe_table &&
+           efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) {
+               efi_warn("Ignoring DXE services table: invalid signature\n");
+               efi_dxe_table = NULL;
+       }
+
        /*
         * If the kernel isn't already loaded at a suitable address,
         * relocate it.

diff --git a/include/linux/efi.h b/include/linux/efi.h
index fd266198f9d8c2e8d82dbe998bc5a5ca513e3a5d..b1f7c6a3e5bf6c6860ce8dfbbb6648cad4d059c2 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -385,6 +385,7 @@ void efi_native_runtime_setup(void);
 #define EFI_LOAD_FILE_PROTOCOL_GUID            EFI_GUID(0x56ec3091, 0x954c, 0x11d2,  0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
 #define EFI_LOAD_FILE2_PROTOCOL_GUID           EFI_GUID(0x4006c0c1, 0xfcb3, 0x403e,  0x99, 0x6d, 0x4a, 0x6c, 0x87, 0x24, 0xe0, 0x6d)
 #define EFI_RT_PROPERTIES_TABLE_GUID           EFI_GUID(0xeb66918a, 0x7eef, 0x402a,  0x84, 0x2e, 0x93, 0x1d, 0x21, 0xc3, 0x8a, 0xe9)
+#define EFI_DXE_SERVICES_TABLE_GUID            EFI_GUID(0x05ad34ba, 0x6f02, 0x4214,  0x95, 0x2e, 0x4d, 0xa0, 0x39, 0x8e, 0x2b, 0xb9)
 
 #define EFI_IMAGE_SECURITY_DATABASE_GUID       EFI_GUID(0xd719b2cb, 0x3d3a, 0x4596,  0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f)
 #define EFI_SHIM_LOCK_GUID                     EFI_GUID(0x605dab50, 0xe046, 0x4300,  0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23)
@@ -438,6 +439,7 @@ typedef struct {
 } efi_config_table_type_t;
 
 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
+#define EFI_DXE_SERVICES_TABLE_SIGNATURE ((u64)0x565245535f455844ULL)
 
 #define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
 #define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))