openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux/arch/arm64/include/asm/efi.h

81 lines
2.2 KiB
C
Raw Normal View History

arm64: add EFI runtime services This patch adds EFI runtime support for arm64. This runtime support allows the kernel to access various EFI runtime services provided by EFI firmware. Things like reboot, real time clock, EFI boot variables, and others. This functionality is supported for little endian kernels only. The UEFI firmware standard specifies that the firmware be little endian. A future patch is expected to add support for big endian kernels running with little endian firmware. Signed-off-by: Mark Salter <msalter@redhat.com> [ Remove unnecessary cache/tlb maintenance. ] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-04-16 09:59:30 +08:00
#ifndef _ASM_EFI_H
#define _ASM_EFI_H
#include <asm/io.h>
arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-11-30 20:28:19 +08:00
#include <asm/mmu_context.h>
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
#include <asm/neon.h>
arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-11-30 20:28:19 +08:00
#include <asm/tlbflush.h>
arm64: add EFI runtime services This patch adds EFI runtime support for arm64. This runtime support allows the kernel to access various EFI runtime services provided by EFI firmware. Things like reboot, real time clock, EFI boot variables, and others. This functionality is supported for little endian kernels only. The UEFI firmware standard specifies that the firmware be little endian. A future patch is expected to add support for big endian kernels running with little endian firmware. Signed-off-by: Mark Salter <msalter@redhat.com> [ Remove unnecessary cache/tlb maintenance. ] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-04-16 09:59:30 +08:00
#ifdef CONFIG_EFI
extern void efi_init(void);
#else
#define efi_init()
#endif
arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-11-30 20:28:19 +08:00
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
efi/arm*: Take the Memory Attributes table into account 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>
2016-04-26 04:06:46 +08:00
#define efi_set_mapping_permissions efi_create_mapping
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
#define efi_call_virt(f, ...) \
({ \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_##f##_t *__f; \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
efi_status_t __s; \
\
kernel_neon_begin(); \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
__s = __f(__VA_ARGS__); \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_virtmap_unload(); \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
kernel_neon_end(); \
__s; \
})
#define __efi_call_virt(f, ...) \
({ \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_##f##_t *__f; \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
\
kernel_neon_begin(); \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
__f(__VA_ARGS__); \
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
efi_virtmap_unload(); \
efi/arm64: Preserve FP/SIMD registers on UEFI runtime services calls According to the UEFI spec section 2.3.6.4, the use of FP/SIMD instructions is allowed, and should adhere to the AAPCS64 calling convention, which states that 'only the bottom 64 bits of each value stored in registers v8-v15 need to be preserved' (section 5.1.2). This applies equally to UEFI Runtime Services called by the kernel, so make sure the FP/SIMD register file is preserved in this case. We do this by enabling the wrappers for UEFI Runtime Services (CONFIG_EFI_RUNTIME_WRAPPERS) and inserting calls to kernel_neon_begin()and kernel_neon_end() into these wrappers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-05 01:41:53 +08:00
kernel_neon_end(); \
})
efi/arm64: efistub: Move shared dependencies to <asm/efi.h> This moves definitions depended upon both by code under arch/arm64/boot and under drivers/firmware/efi to <asm/efi.h>. This is in preparation of turning the stub code under drivers/firmware/efi into a static library. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-07-02 20:54:41 +08:00
/* 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__)
arm64/efi: set EFI_ALLOC_ALIGN to 64 KB Set EFI_ALLOC_ALIGN to 64 KB so that all allocations done by the stub are naturally compatible with a 64 KB granule kernel. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-11-17 20:50:21 +08:00
#define EFI_ALLOC_ALIGN SZ_64K
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
/*
arm64/efi: move virtmap init to early initcall Now that the create_mapping() code in mm/mmu.c is able to support setting up kernel page tables at initcall time, we can move the whole virtmap creation to arm64_enable_runtime_services() instead of having a distinct stage during early boot. This also allows us to drop the arm64-specific EFI_VIRTMAP flag. Signed-off-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-01-22 18:01:40 +08:00
* On ARM systems, virtually remapped UEFI runtime services are set up in two
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
* 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)
arm64/efi: move virtmap init to early initcall Now that the create_mapping() code in mm/mmu.c is able to support setting up kernel page tables at initcall time, we can move the whole virtmap creation to arm64_enable_runtime_services() instead of having a distinct stage during early boot. This also allows us to drop the arm64-specific EFI_VIRTMAP flag. Signed-off-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-01-22 18:01:40 +08:00
* - 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.
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
*/
arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-11-30 20:28:19 +08:00
static inline void efi_set_pgd(struct mm_struct *mm)
{
switch_mm(NULL, mm, NULL);
}
arm64/efi: move SetVirtualAddressMap() to UEFI stub In order to support kexec, the kernel needs to be able to deal with the state of the UEFI firmware after SetVirtualAddressMap() has been called. To avoid having separate code paths for non-kexec and kexec, let's move the call to SetVirtualAddressMap() to the stub: this will guarantee us that it will only be called once (since the stub is not executed during kexec), and ensures that the UEFI state is identical between kexec and normal boot. This implies that the layout of the virtual mapping needs to be created by the stub as well. All regions are rounded up to a naturally aligned multiple of 64 KB (for compatibility with 64k pages kernels) and recorded in the UEFI memory map. The kernel proper reads those values and installs the mappings in a dedicated set of page tables that are swapped in during UEFI Runtime Services calls. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-20 22:27:26 +08:00
void efi_virtmap_load(void);
void efi_virtmap_unload(void);
arm64: add EFI runtime services This patch adds EFI runtime support for arm64. This runtime support allows the kernel to access various EFI runtime services provided by EFI firmware. Things like reboot, real time clock, EFI boot variables, and others. This functionality is supported for little endian kernels only. The UEFI firmware standard specifies that the firmware be little endian. A future patch is expected to add support for big endian kernels running with little endian firmware. Signed-off-by: Mark Salter <msalter@redhat.com> [ Remove unnecessary cache/tlb maintenance. ] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-04-16 09:59:30 +08:00
#endif /* _ASM_EFI_H */