[mirror_ubuntu-zesty-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/ptrace.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);
int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);

#define arch_efi_call_virt_setup()					\
({									\
	kernel_neon_begin();						\
	efi_virtmap_load();						\
})

#define arch_efi_call_virt(p, f, args...)				\
({									\
	efi_##f##_t *__f;						\
	__f = p->f;							\
	__f(args);							\
})

#define arch_efi_call_virt_teardown()					\
({									\
	efi_virtmap_unload();						\
	kernel_neon_end();						\
})

#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)

/* 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 alloc_screen_info(x...)		&screen_info
#define free_screen_info(x...)

static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
{
}

#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>
ee6cab5d	7	#include <asm/ptrace.h>
f7d92489	8	#include <asm/tlbflush.h>
f84d0275 MS	9
	10	#ifdef CONFIG_EFI
	11	extern void efi_init(void);
f84d0275 MS	12	#else
f84d0275 MS	13	#define efi_init()
f84d0275 MS	14	#endif
f84d0275 MS	15
f7d92489	16	int efi_create_mapping(struct mm_struct mm, efi_memory_desc_t md);
bd264d04	17	int efi_set_mapping_permissions(struct mm_struct mm, efi_memory_desc_t md);
789957ef	18
489f80f7	19	#define arch_efi_call_virt_setup() \
e15dd494	20	({ \
e15dd494	21	kernel_neon_begin(); \
f3cdfd23	22	efi_virtmap_load(); \
e15dd494 AB	23	})
e15dd494 AB	24
80e75596	25	#define arch_efi_call_virt(p, f, args...) \
e15dd494	26	({ \
f3cdfd23	27	efi_##f##_t *__f; \
80e75596	28	__f = p->f; \
489f80f7 MR	29	__f(args); \
	30	})
	31
	32	#define arch_efi_call_virt_teardown() \
	33	({ \
f3cdfd23	34	efi_virtmap_unload(); \
e15dd494 AB	35	kernel_neon_end(); \
	36	})
	37
ee6cab5d MR	38	#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT \| PSR_A_BIT \| PSR_I_BIT \| PSR_F_BIT)
ee6cab5d MR	39
a13b0077 AB	40	/* arch specific definitions used by the stub code */
	41
	42	/*
	43	* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
	44	* start of kernel and may not cross a 2MiB boundary. We set alignment to
	45	* 2MiB so we know it won't cross a 2MiB boundary.
	46	*/
	47	#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
	48	#define MAX_FDT_OFFSET SZ_512M
	49
fc372064 AB	50	#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
	51	#define __efi_call_early(f, ...) f(__VA_ARGS__)
	52	#define efi_is_64bit() (true)
a13b0077	53
57fdb89a AB	54	#define alloc_screen_info(x...) &screen_info
	55	#define free_screen_info(x...)
	56
9822504c AB	57	static inline void efifb_setup_from_dmi(struct screen_info si, const char opt)
	58	{
	59	}
	60
1bd0abb0 AB	61	#define EFI_ALLOC_ALIGN SZ_64K
1bd0abb0 AB	62
f3cdfd23	63	/*
60305db9	64	* On ARM systems, virtually remapped UEFI runtime services are set up in two
f3cdfd23 AB	65	* distinct stages:
	66	* - The stub retrieves the final version of the memory map from UEFI, populates
	67	* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
	68	* service to communicate the new mapping to the firmware (Note that the new
	69	* mapping is not live at this time)
60305db9 AB	70	* - During an early initcall(), the EFI system table is permanently remapped
	71	* and the virtual remapping of the UEFI Runtime Services regions is loaded
	72	* into a private set of page tables. If this all succeeds, the Runtime
	73	* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
f3cdfd23	74	*/
f3cdfd23	75
f7d92489 AB	76	static inline void efi_set_pgd(struct mm_struct *mm)
	77	{
	78	switch_mm(NULL, mm, NULL);
	79	}
	80
f3cdfd23 AB	81	void efi_virtmap_load(void);
	82	void efi_virtmap_unload(void);
	83
f84d0275	84	#endif /* _ASM_EFI_H */