789957ef72
Call into the generic memory attributes table support code at the appropriate times during the init sequence so that the UEFI Runtime Services region are mapped according to the strict permissions it specifies. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1461614832-17633-15-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
#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_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 */
|