path: root/drivers/firmware/efi/libstub/efistub.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H

#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <asm/efi.h>

/* error code which can't be mistaken for valid address */
#define EFI_ERROR	(~0UL)

/*
 * __init annotations should not be used in the EFI stub, since the code is
 * either included in the decompressor (x86, ARM) where they have no effect,
 * or the whole stub is __init annotated at the section level (arm64), by
 * renaming the sections, in which case the __init annotation will be
 * redundant, and will result in section names like .init.init.text, and our
 * linker script does not expect that.
 */
#undef __init

/*
 * Allow the platform to override the allocation granularity: this allows
 * systems that have the capability to run with a larger page size to deal
 * with the allocations for initrd and fdt more efficiently.
 */
#ifndef EFI_ALLOC_ALIGN
#define EFI_ALLOC_ALIGN		EFI_PAGE_SIZE
#endif

extern bool efi_nochunk;
extern bool efi_nokaslr;
extern bool efi_noinitrd;
extern bool efi_quiet;
extern bool efi_novamap;

extern const efi_system_table_t *efi_system_table;

#ifndef ARCH_HAS_EFISTUB_WRAPPERS

#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_table_attr(inst, attr)	(inst->attr)
#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)

#endif

#define efi_info(msg)		do {			\
	if (!efi_quiet) efi_printk("EFI stub: "msg);	\
} while (0)

#define efi_err(msg) efi_printk("EFI stub: ERROR: "msg)

/* Helper macros for the usual case of using simple C variables: */
#ifndef fdt_setprop_inplace_var
#define fdt_setprop_inplace_var(fdt, node_offset, name, var) \
	fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var))
#endif

#ifndef fdt_setprop_var
#define fdt_setprop_var(fdt, node_offset, name, var) \
	fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var))
#endif

#define get_efi_var(name, vendor, ...)				\
	efi_rt_call(get_variable, (efi_char16_t *)(name),	\
		    (efi_guid_t *)(vendor), __VA_ARGS__)

#define set_efi_var(name, vendor, ...)				\
	efi_rt_call(set_variable, (efi_char16_t *)(name),	\
		    (efi_guid_t *)(vendor), __VA_ARGS__)

#define efi_get_handle_at(array, idx)					\
	(efi_is_native() ? (array)[idx] 				\
		: (efi_handle_t)(unsigned long)((u32 *)(array))[idx])

#define efi_get_handle_num(size)					\
	((size) / (efi_is_native() ? sizeof(efi_handle_t) : sizeof(u32)))

#define for_each_efi_handle(handle, array, size, i)			\
	for (i = 0;							\
	     i < efi_get_handle_num(size) &&				\
		((handle = efi_get_handle_at((array), i)) || true);	\
	     i++)

static inline
void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
{
	*lo = lower_32_bits(data);
	*hi = upper_32_bits(data);
}

/*
 * Allocation types for calls to boottime->allocate_pages.
 */
#define EFI_ALLOCATE_ANY_PAGES		0
#define EFI_ALLOCATE_MAX_ADDRESS	1
#define EFI_ALLOCATE_ADDRESS		2
#define EFI_MAX_ALLOCATE_TYPE		3

/*
 * The type of search to perform when calling boottime->locate_handle
 */
#define EFI_LOCATE_ALL_HANDLES			0
#define EFI_LOCATE_BY_REGISTER_NOTIFY		1
#define EFI_LOCATE_BY_PROTOCOL			2

struct efi_boot_memmap {
	efi_memory_desc_t	**map;
	unsigned long		*map_size;
	unsigned long		*desc_size;
	u32			*desc_ver;
	unsigned long		*key_ptr;
	unsigned long		*buff_size;
};

typedef struct efi_generic_dev_path efi_device_path_protocol_t;

/*
 * EFI Boot Services table
 */
union efi_boot_services {
	struct {
		efi_table_hdr_t hdr;
		void *raise_tpl;
		void *restore_tpl;
		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;
		void *signal_event;
		void *close_event;
		void *check_event;
		void *install_protocol_interface;
		void *reinstall_protocol_interface;
		void *uninstall_protocol_interface;
		efi_status_t (__efiapi *handle_protocol)(efi_handle_t,
							 efi_guid_t *, void **);
		void *__reserved;
		void *register_protocol_notify;
		efi_status_t (__efiapi *locate_handle)(int, efi_guid_t *,
						       void *, unsigned long *,
						       efi_handle_t *);
		efi_status_t (__efiapi *locate_device_path)(efi_guid_t *,
							    efi_device_path_protocol_t **,
							    efi_handle_t *);
		efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *,
								     void *);
		void *load_image;
		void *start_image;
		efi_status_t __noreturn (__efiapi *exit)(efi_handle_t,
							 efi_status_t,
							 unsigned long,
							 efi_char16_t *);
		void *unload_image;
		efi_status_t (__efiapi *exit_boot_services)(efi_handle_t,
							    unsigned long);
		void *get_next_monotonic_count;
		void *stall;
		void *set_watchdog_timer;
		void *connect_controller;
		efi_status_t (__efiapi *disconnect_controller)(efi_handle_t,
							       efi_handle_t,
							       efi_handle_t);
		void *open_protocol;
		void *close_protocol;
		void *open_protocol_information;
		void *protocols_per_handle;
		void *locate_handle_buffer;
		efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *,
							 void **);
		void *install_multiple_protocol_interfaces;
		void *uninstall_multiple_protocol_interfaces;
		void *calculate_crc32;
		void *copy_mem;
		void *set_mem;
		void *create_event_ex;
	};
	struct {
		efi_table_hdr_t hdr;
		u32 raise_tpl;
		u32 restore_tpl;
		u32 allocate_pages;
		u32 free_pages;
		u32 get_memory_map;
		u32 allocate_pool;
		u32 free_pool;
		u32 create_event;
		u32 set_timer;
		u32 wait_for_event;
		u32 signal_event;
		u32 close_event;
		u32 check_event;
		u32 install_protocol_interface;
		u32 reinstall_protocol_interface;
		u32 uninstall_protocol_interface;
		u32 handle_protocol;
		u32 __reserved;
		u32 register_protocol_notify;
		u32 locate_handle;
		u32 locate_device_path;
		u32 install_configuration_table;
		u32 load_image;
		u32 start_image;
		u32 exit;
		u32 unload_image;
		u32 exit_boot_services;
		u32 get_next_monotonic_count;
		u32 stall;
		u32 set_watchdog_timer;
		u32 connect_controller;
		u32 disconnect_controller;
		u32 open_protocol;
		u32 close_protocol;
		u32 open_protocol_information;
		u32 protocols_per_handle;
		u32 locate_handle_buffer;
		u32 locate_protocol;
		u32 install_multiple_protocol_interfaces;
		u32 uninstall_multiple_protocol_interfaces;
		u32 calculate_crc32;
		u32 copy_mem;
		u32 set_mem;
		u32 create_event_ex;
	} mixed_mode;
};

typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;

union efi_uga_draw_protocol {
	struct {
		efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *,
						  u32*, u32*, u32*, u32*);
		void *set_mode;
		void *blt;
	};
	struct {
		u32 get_mode;
		u32 set_mode;
		u32 blt;
	} mixed_mode;
};

union efi_simple_text_output_protocol {
	struct {
		void *reset;
		efi_status_t (__efiapi *output_string)(efi_simple_text_output_protocol_t *,
						       efi_char16_t *);
		void *test_string;
	};
	struct {
		u32 reset;
		u32 output_string;
		u32 test_string;