[mirror_ubuntu-bionic-kernel.git] / arch / arm64 / include / asm / efi.h

#ifndef _ASM_EFI_H
#define _ASM_EFI_H

#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/neon.h>
#include <asm/tlbflush.h>

#ifdef CONFIG_EFI
extern void efi_init(void);
#else
#define efi_init()
#endif

int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);

#define efi_set_mapping_permissions	efi_create_mapping

#define efi_call_virt(f, ...)						\
({									\
	efi_##f##_t *__f;						\
	efi_status_t __s;						\
									\
	kernel_neon_begin();						\
	efi_virtmap_load();						\
	__f = efi.systab->runtime->f;					\
	__s = __f(__VA_ARGS__);						\
	efi_virtmap_unload();						\
	kernel_neon_end();						\
	__s;								\
})

#define __efi_call_virt(f, ...)						\
({									\
	efi_##f##_t *__f;						\
									\
	kernel_neon_begin();						\
	efi_virtmap_load();						\
	__f = efi.systab->runtime->f;					\
	__f(__VA_ARGS__);						\
	efi_virtmap_unload();						\
	kernel_neon_end();						\
})

/* arch specific definitions used by the stub code */

/*
 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
 * start of kernel and may not cross a 2MiB boundary. We set alignment to
 * 2MiB so we know it won't cross a 2MiB boundary.
 */
#define EFI_FDT_ALIGN	SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
#define MAX_FDT_OFFSET	SZ_512M

#define efi_call_early(f, ...)		sys_table_arg->boottime->f(__VA_ARGS__)
#define __efi_call_early(f, ...)	f(__VA_ARGS__)
#define efi_is_64bit()			(true)

#define EFI_ALLOC_ALIGN		SZ_64K

/*
 * On ARM systems, virtually remapped UEFI runtime services are set up in two
 * distinct stages:
 * - The stub retrieves the final version of the memory map from UEFI, populates
 *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
 *   service to communicate the new mapping to the firmware (Note that the new
 *   mapping is not live at this time)
 * - During an early initcall(), the EFI system table is permanently remapped
 *   and the virtual remapping of the UEFI Runtime Services regions is loaded
 *   into a private set of page tables. If this all succeeds, the Runtime
 *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
 */

static inline void efi_set_pgd(struct mm_struct *mm)
{
	switch_mm(NULL, mm, NULL);
}

void efi_virtmap_load(void);
void efi_virtmap_unload(void);

#endif /* _ASM_EFI_H */
Commit	Line	Data
f84d0275 MS	1	#ifndef _ASM_EFI_H
	2	#define _ASM_EFI_H
	3
	4	#include <asm/io.h>
f7d92489	5	#include <asm/mmu_context.h>
e15dd494	6	#include <asm/neon.h>
f7d92489	7	#include <asm/tlbflush.h>
f84d0275 MS	8
	9	#ifdef CONFIG_EFI
	10	extern void efi_init(void);
f84d0275 MS	11	#else
f84d0275 MS	12	#define efi_init()
f84d0275 MS	13	#endif
f84d0275 MS	14
f7d92489 AB	15	int efi_create_mapping(struct mm_struct mm, efi_memory_desc_t md);
f7d92489 AB	16
789957ef AB	17	#define efi_set_mapping_permissions efi_create_mapping
789957ef AB	18
e15dd494 AB	19	#define efi_call_virt(f, ...) \
e15dd494 AB	20	({ \
f3cdfd23	21	efi_##f##_t *__f; \
e15dd494 AB	22	efi_status_t __s; \
	23	\
	24	kernel_neon_begin(); \
f3cdfd23 AB	25	efi_virtmap_load(); \
f3cdfd23 AB	26	__f = efi.systab->runtime->f; \
e15dd494	27	__s = __f(__VA_ARGS__); \
f3cdfd23	28	efi_virtmap_unload(); \
e15dd494 AB	29	kernel_neon_end(); \
	30	__s; \
	31	})
	32
	33	#define __efi_call_virt(f, ...) \
	34	({ \
f3cdfd23	35	efi_##f##_t *__f; \
e15dd494 AB	36	\
e15dd494 AB	37	kernel_neon_begin(); \
f3cdfd23 AB	38	efi_virtmap_load(); \
f3cdfd23 AB	39	__f = efi.systab->runtime->f; \
e15dd494	40	__f(__VA_ARGS__); \
f3cdfd23	41	efi_virtmap_unload(); \
e15dd494 AB	42	kernel_neon_end(); \
	43	})
	44
a13b0077 AB	45	/* arch specific definitions used by the stub code */
	46
	47	/*
	48	* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
	49	* start of kernel and may not cross a 2MiB boundary. We set alignment to
	50	* 2MiB so we know it won't cross a 2MiB boundary.
	51	*/
	52	#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
	53	#define MAX_FDT_OFFSET SZ_512M
	54
fc372064 AB	55	#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
	56	#define __efi_call_early(f, ...) f(__VA_ARGS__)
	57	#define efi_is_64bit() (true)
a13b0077	58
1bd0abb0 AB	59	#define EFI_ALLOC_ALIGN SZ_64K
1bd0abb0 AB	60
f3cdfd23	61	/*
60305db9	62	* On ARM systems, virtually remapped UEFI runtime services are set up in two
f3cdfd23 AB	63	* distinct stages:
	64	* - The stub retrieves the final version of the memory map from UEFI, populates
	65	* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
	66	* service to communicate the new mapping to the firmware (Note that the new
	67	* mapping is not live at this time)
60305db9 AB	68	* - During an early initcall(), the EFI system table is permanently remapped
	69	* and the virtual remapping of the UEFI Runtime Services regions is loaded
	70	* into a private set of page tables. If this all succeeds, the Runtime
	71	* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
f3cdfd23	72	*/
f3cdfd23	73
f7d92489 AB	74	static inline void efi_set_pgd(struct mm_struct *mm)
	75	{
	76	switch_mm(NULL, mm, NULL);
	77	}
	78
f3cdfd23 AB	79	void efi_virtmap_load(void);
	80	void efi_virtmap_unload(void);
	81
f84d0275	82	#endif /* _ASM_EFI_H */