f3cdfd239d
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>
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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/* error code which can't be mistaken for valid address */
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#define EFI_ERROR (~0UL)
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void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
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efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg, void *__image,
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void **__fh);
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efi_status_t efi_file_size(efi_system_table_t *sys_table_arg, void *__fh,
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efi_char16_t *filename_16, void **handle,
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u64 *file_sz);
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efi_status_t efi_file_read(void *handle, unsigned long *size, void *addr);
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efi_status_t efi_file_close(void *handle);
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unsigned long get_dram_base(efi_system_table_t *sys_table_arg);
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efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
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unsigned long orig_fdt_size,
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void *fdt, int new_fdt_size, char *cmdline_ptr,
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u64 initrd_addr, u64 initrd_size,
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efi_memory_desc_t *memory_map,
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unsigned long map_size, unsigned long desc_size,
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u32 desc_ver);
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efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
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void *handle,
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unsigned long *new_fdt_addr,
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unsigned long max_addr,
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u64 initrd_addr, u64 initrd_size,
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char *cmdline_ptr,
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unsigned long fdt_addr,
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unsigned long fdt_size);
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void *get_fdt(efi_system_table_t *sys_table);
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void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
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unsigned long desc_size, efi_memory_desc_t *runtime_map,
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int *count);
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#endif
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