efi.h 2.34 KB
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#ifndef _ASM_EFI_H
#define _ASM_EFI_H

#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/neon.h>
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#include <asm/ptrace.h>
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#include <asm/tlbflush.h>
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#ifdef CONFIG_EFI
extern void efi_init(void);
#else
#define efi_init()
#endif

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

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#define efi_set_mapping_permissions	efi_create_mapping

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

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

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

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

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/* 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

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

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

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#define EFI_ALLOC_ALIGN		SZ_64K

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/*
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 * On ARM systems, virtually remapped UEFI runtime services are set up in two
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 * 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)
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 * - 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.
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 */

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

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

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#endif /* _ASM_EFI_H */