drivers/firmware/efi/libstub/efistub.h

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

#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
#define _DRIVERS_FIRMWARE_EFI_EFISTUB_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

#ifdef CONFIG_ARM
#define __efistub_global	__section(.data)
#else
#define __efistub_global
#endif

extern bool __pure nokaslr(void);
extern bool __pure is_quiet(void);
extern bool __pure novamap(void);

extern __pure efi_system_table_t  *efi_system_table(void);

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

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

void efi_char16_printk(efi_char16_t *);
void efi_char16_printk(efi_char16_t *);

unsigned long get_dram_base(void);

efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
					    unsigned long *new_fdt_addr,
					    unsigned long max_addr,
					    u64 initrd_addr, u64 initrd_size,
					    char *cmdline_ptr,
					    unsigned long fdt_addr,
					    unsigned long fdt_size);

void *get_fdt(unsigned long *fdt_size);

void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
		     unsigned long desc_size, efi_memory_desc_t *runtime_map,
		     int *count);

efi_status_t efi_get_random_bytes(unsigned long size, u8 *out);

efi_status_t efi_random_alloc(unsigned long size, unsigned long align,
			      unsigned long *addr, unsigned long random_seed);

efi_status_t check_platform_features(void);

void *get_efi_config_table(efi_guid_t guid);

/* 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__)

#endif