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Subject[PATCH 09/10] efi/libstub: annotate firmware routines as __efiapi
Date
Annotate all the firmware routines (boot services, runtime services and
protocol methods) called in the boot context as __efiapi, and make
it expand to __attribute__((ms_abi)) on 64-bit x86. This allows us
to use the compiler to generate the calls into firmware that use the
MS calling convention instead of the SysV one.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/Kconfig | 1 +
arch/x86/boot/compressed/eboot.h | 4 +-
drivers/firmware/efi/libstub/random.c | 8 +-
include/linux/efi.h | 130 +++++++++++---------
4 files changed, 79 insertions(+), 64 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5e8949953660..8ba81036a7ef 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1993,6 +1993,7 @@ config EFI
config EFI_STUB
bool "EFI stub support"
depends on EFI && !X86_USE_3DNOW
+ depends on $(cc-option,-mabi=ms)
select RELOCATABLE
---help---
This kernel feature allows a bzImage to be loaded directly
diff --git a/arch/x86/boot/compressed/eboot.h b/arch/x86/boot/compressed/eboot.h
index 318531f128c2..512d2143a94f 100644
--- a/arch/x86/boot/compressed/eboot.h
+++ b/arch/x86/boot/compressed/eboot.h
@@ -19,8 +19,8 @@ typedef struct {
} efi_uga_draw_protocol_32_t;

typedef struct efi_uga_draw_protocol {
- efi_status_t (*get_mode)(struct efi_uga_draw_protocol *,
- u32*, u32*, u32*, u32*);
+ efi_status_t (__efiapi *get_mode)(struct efi_uga_draw_protocol *,
+ u32*, u32*, u32*, u32*);
void *set_mode;
void *blt;
} efi_uga_draw_protocol_t;
diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c
index 3b85883fb312..872d2de3eaaf 100644
--- a/drivers/firmware/efi/libstub/random.c
+++ b/drivers/firmware/efi/libstub/random.c
@@ -17,10 +17,10 @@ typedef struct {
} efi_rng_protocol_32_t;

struct efi_rng_protocol {
- efi_status_t (*get_info)(struct efi_rng_protocol *,
- unsigned long *, efi_guid_t *);
- efi_status_t (*get_rng)(struct efi_rng_protocol *,
- efi_guid_t *, unsigned long, u8 *out);
+ efi_status_t (__efiapi *get_info)(struct efi_rng_protocol *,
+ unsigned long *, efi_guid_t *);
+ efi_status_t (__efiapi *get_rng)(struct efi_rng_protocol *,
+ efi_guid_t *, unsigned long, u8 *out);
};

efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7f1a99bd2c05..2ba13d901055 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -48,6 +48,12 @@ typedef u16 efi_char16_t; /* UNICODE character */
typedef u64 efi_physical_addr_t;
typedef void *efi_handle_t;

+#ifdef CONFIG_X86_64
+#define __efiapi __attribute__((ms_abi))
+#else
+#define __efiapi
+#endif
+
#define for_each_efi_handle(handle, array, size, i) \
for (i = 1, handle = efi_is_native() ? (array)[0] \
: (efi_handle_t)(unsigned long)((u32 *)(array))[0]; \
@@ -266,13 +272,14 @@ typedef struct {
efi_table_hdr_t hdr;
void *raise_tpl;
void *restore_tpl;
- efi_status_t (*allocate_pages)(int, int, unsigned long,
- efi_physical_addr_t *);
- efi_status_t (*free_pages)(efi_physical_addr_t, unsigned long);
- efi_status_t (*get_memory_map)(unsigned long *, void *, unsigned long *,
- unsigned long *, u32 *);
- efi_status_t (*allocate_pool)(int, unsigned long, void **);
- efi_status_t (*free_pool)(void *);
+ efi_status_t (__efiapi *allocate_pages)(int, int, unsigned long,
+ efi_physical_addr_t *);
+ efi_status_t (__efiapi *free_pages)(efi_physical_addr_t, unsigned long);
+ efi_status_t (__efiapi *get_memory_map)(unsigned long *, void *,
+ unsigned long *,
+ unsigned long *, u32 *);
+ efi_status_t (__efiapi *allocate_pool)(int, unsigned long, void **);
+ efi_status_t (__efiapi *free_pool)(void *);
void *create_event;
void *set_timer;
void *wait_for_event;
@@ -282,18 +289,21 @@ typedef struct {
void *install_protocol_interface;
void *reinstall_protocol_interface;
void *uninstall_protocol_interface;
- efi_status_t (*handle_protocol)(efi_handle_t, efi_guid_t *, void **);
+ efi_status_t (__efiapi *handle_protocol)(efi_handle_t, efi_guid_t *,
+ void **);
void *__reserved;
void *register_protocol_notify;
- efi_status_t (*locate_handle)(int, efi_guid_t *, void *,
+ efi_status_t (__efiapi *locate_handle)(int, efi_guid_t *, void *,
unsigned long *, efi_handle_t *);
void *locate_device_path;
- efi_status_t (*install_configuration_table)(efi_guid_t *, void *);
+ efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *,
+ void *);
void *load_image;
void *start_image;
void *exit;
void *unload_image;
- efi_status_t (*exit_boot_services)(efi_handle_t, unsigned long);
+ efi_status_t (__efiapi *exit_boot_services)(efi_handle_t,
+ unsigned long);
void *get_next_monotonic_count;
void *stall;
void *set_watchdog_timer;
@@ -304,7 +314,7 @@ typedef struct {
void *open_protocol_information;
void *protocols_per_handle;
void *locate_handle_buffer;
- efi_status_t (*locate_protocol)(efi_guid_t *, void *, void **);
+ efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *, void **);
void *install_multiple_protocol_interfaces;
void *uninstall_multiple_protocol_interfaces;
void *calculate_crc32;
@@ -346,13 +356,13 @@ typedef struct {
typedef struct efi_pci_io_protocol efi_pci_io_protocol_t;

typedef
-efi_status_t (*efi_pci_io_protocol_mem_t)(struct efi_pci_io_protocol *,
+efi_status_t (__efiapi *efi_pci_io_protocol_mem_t)(struct efi_pci_io_protocol *,
EFI_PCI_IO_PROTOCOL_WIDTH,
u8 bar_index, u64 offset,
unsigned long count, void *buffer);

typedef
-efi_status_t (*efi_pci_io_protocol_cfg_t)(struct efi_pci_io_protocol *,
+efi_status_t (__efiapi *efi_pci_io_protocol_cfg_t)(struct efi_pci_io_protocol *,
EFI_PCI_IO_PROTOCOL_WIDTH,
u32 offset, unsigned long count,
void *buffer);
@@ -399,11 +409,11 @@ struct efi_pci_io_protocol {
void *allocate_buffer;
void *free_buffer;
void *flush;
- efi_status_t (*get_location)(struct efi_pci_io_protocol *,
- unsigned long *segment_nr,
- unsigned long *bus_nr,
- unsigned long *device_nr,
- unsigned long *function_nr);
+ efi_status_t (__efiapi *get_location)(struct efi_pci_io_protocol *,
+ unsigned long *segment_nr,
+ unsigned long *bus_nr,
+ unsigned long *device_nr,
+ unsigned long *function_nr);
void *attributes;
void *get_bar_attributes;
void *set_bar_attributes;
@@ -443,16 +453,16 @@ struct efi_dev_path;

typedef struct apple_properties_protocol {
unsigned long version;
- efi_status_t (*get)(struct apple_properties_protocol *,
- struct efi_dev_path *, efi_char16_t *,
- void *, u32 *);
- efi_status_t (*set)(struct apple_properties_protocol *,
- struct efi_dev_path *, efi_char16_t *,
- void *, u32);
- efi_status_t (*del)(struct apple_properties_protocol *,
- struct efi_dev_path *, efi_char16_t *);
- efi_status_t (*get_all)(struct apple_properties_protocol *,
- void *buffer, u32 *);
+ efi_status_t (__efiapi *get)(struct apple_properties_protocol *,
+ struct efi_dev_path *, efi_char16_t *,
+ void *, u32 *);
+ efi_status_t (__efiapi *set)(struct apple_properties_protocol *,
+ struct efi_dev_path *, efi_char16_t *,
+ void *, u32);
+ efi_status_t (__efiapi *del)(struct apple_properties_protocol *,
+ struct efi_dev_path *, efi_char16_t *);
+ efi_status_t (__efiapi *get_all)(struct apple_properties_protocol *,
+ void *buffer, u32 *);
} apple_properties_protocol_t;

typedef struct {
@@ -469,8 +479,11 @@ typedef u32 efi_tcg2_event_log_format;

typedef struct {
void *get_capability;
- efi_status_t (*get_event_log)(efi_handle_t, efi_tcg2_event_log_format,
- efi_physical_addr_t *, efi_physical_addr_t *, efi_bool_t *);
+ efi_status_t (__efiapi *get_event_log)(efi_handle_t,
+ efi_tcg2_event_log_format,
+ efi_physical_addr_t *,
+ efi_physical_addr_t *,
+ efi_bool_t *);
void *hash_log_extend_event;
void *submit_command;
void *get_active_pcr_banks;
@@ -562,21 +575,21 @@ typedef efi_status_t efi_query_variable_store_t(u32 attributes,
bool nonblocking);

typedef struct {
- efi_table_hdr_t hdr;
- efi_get_time_t *get_time;
- efi_set_time_t *set_time;
- efi_get_wakeup_time_t *get_wakeup_time;
- efi_set_wakeup_time_t *set_wakeup_time;
- efi_set_virtual_address_map_t *set_virtual_address_map;
- void *convert_pointer;
- efi_get_variable_t *get_variable;
- efi_get_next_variable_t *get_next_variable;
- efi_set_variable_t *set_variable;
- efi_get_next_high_mono_count_t *get_next_high_mono_count;
- efi_reset_system_t *reset_system;
- efi_update_capsule_t *update_capsule;
- efi_query_capsule_caps_t *query_capsule_caps;
- efi_query_variable_info_t *query_variable_info;
+ efi_table_hdr_t hdr;
+ efi_get_time_t __efiapi *get_time;
+ efi_set_time_t __efiapi *set_time;
+ efi_get_wakeup_time_t __efiapi *get_wakeup_time;
+ efi_set_wakeup_time_t __efiapi *set_wakeup_time;
+ efi_set_virtual_address_map_t __efiapi *set_virtual_address_map;
+ void *convert_pointer;
+ efi_get_variable_t __efiapi *get_variable;
+ efi_get_next_variable_t __efiapi *get_next_variable;
+ efi_set_variable_t __efiapi *set_variable;
+ efi_get_next_high_mono_count_t __efiapi *get_next_high_mono_count;
+ efi_reset_system_t __efiapi *reset_system;
+ efi_update_capsule_t __efiapi *update_capsule;
+ efi_query_capsule_caps_t __efiapi *query_capsule_caps;
+ efi_query_variable_info_t __efiapi *query_variable_info;
} efi_runtime_services_t;

void efi_native_runtime_setup(void);
@@ -796,7 +809,7 @@ typedef struct {
__aligned_u64 image_size;
unsigned int image_code_type;
unsigned int image_data_type;
- efi_status_t (*unload)(efi_handle_t image_handle);
+ efi_status_t (__efiapi *unload)(efi_handle_t image_handle);
} efi_loaded_image_t;


@@ -827,18 +840,19 @@ typedef struct {

typedef struct _efi_file_handle {
u64 revision;
- efi_status_t (*open)(struct _efi_file_handle *,
- struct _efi_file_handle **,
- efi_char16_t *, u64, u64);
- efi_status_t (*close)(struct _efi_file_handle *);
+ efi_status_t (__efiapi *open)(struct _efi_file_handle *,
+ struct _efi_file_handle **,
+ efi_char16_t *, u64, u64);
+ efi_status_t (__efiapi *close)(struct _efi_file_handle *);
void *delete;
- efi_status_t (*read)(struct _efi_file_handle *, unsigned long *,
- void *);
+ efi_status_t (__efiapi *read)(struct _efi_file_handle *,
+ unsigned long *, void *);
void *write;
void *get_position;
void *set_position;
- efi_status_t (*get_info)(struct _efi_file_handle *, efi_guid_t *,
- unsigned long *, void *);
+ efi_status_t (__efiapi *get_info)(struct _efi_file_handle *,
+ efi_guid_t *, unsigned long *,
+ void *);
void *set_info;
void *flush;
} efi_file_handle_t;
@@ -850,8 +864,8 @@ typedef struct {

typedef struct _efi_file_io_interface {
u64 revision;
- int (*open_volume)(struct _efi_file_io_interface *,
- efi_file_handle_t **);
+ int (__efiapi *open_volume)(struct _efi_file_io_interface *,
+ efi_file_handle_t **);
} efi_file_io_interface_t;

#define EFI_FILE_MODE_READ 0x0000000000000001
@@ -1325,7 +1339,7 @@ typedef struct {

typedef struct efi_simple_text_output_protocol {
void *reset;
- efi_status_t (*output_string)(void *, void *);
+ efi_status_t (__efiapi *output_string)(void *, void *);
void *test_string;
} efi_simple_text_output_protocol_t;

--
2.17.1
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