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This patch adds PE/COFF header fields to the start of the kernel Image so that it appears as an EFI application to UEFI firmware. An EFI stub is included to allow direct booting of the kernel Image. Signed-off-by: Mark Salter <[email protected]> [Add support in PE/COFF header for signed images] Signed-off-by: Ard Biesheuvel <[email protected]> Signed-off-by: Leif Lindholm <[email protected]> Acked-by: Catalin Marinas <[email protected]> Signed-off-by: Matt Fleming <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * EFI entry point. | ||
| * | ||
| * Copyright (C) 2013, 2014 Red Hat, Inc. | ||
| * Author: Mark Salter <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| */ | ||
| #include <linux/linkage.h> | ||
| #include <linux/init.h> | ||
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| #include <asm/assembler.h> | ||
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| #define EFI_LOAD_ERROR 0x8000000000000001 | ||
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| __INIT | ||
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| /* | ||
| * We arrive here from the EFI boot manager with: | ||
| * | ||
| * * CPU in little-endian mode | ||
| * * MMU on with identity-mapped RAM | ||
| * * Icache and Dcache on | ||
| * | ||
| * We will most likely be running from some place other than where | ||
| * we want to be. The kernel image wants to be placed at TEXT_OFFSET | ||
| * from start of RAM. | ||
| */ | ||
| ENTRY(efi_stub_entry) | ||
| /* | ||
| * Create a stack frame to save FP/LR with extra space | ||
| * for image_addr variable passed to efi_entry(). | ||
| */ | ||
| stp x29, x30, [sp, #-32]! | ||
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| /* | ||
| * Call efi_entry to do the real work. | ||
| * x0 and x1 are already set up by firmware. Current runtime | ||
| * address of image is calculated and passed via *image_addr. | ||
| * | ||
| * unsigned long efi_entry(void *handle, | ||
| * efi_system_table_t *sys_table, | ||
| * unsigned long *image_addr) ; | ||
| */ | ||
| adrp x8, _text | ||
| add x8, x8, #:lo12:_text | ||
| add x2, sp, 16 | ||
| str x8, [x2] | ||
| bl efi_entry | ||
| cmn x0, #1 | ||
| b.eq efi_load_fail | ||
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| /* | ||
| * efi_entry() will have relocated the kernel image if necessary | ||
| * and we return here with device tree address in x0 and the kernel | ||
| * entry point stored at *image_addr. Save those values in registers | ||
| * which are callee preserved. | ||
| */ | ||
| mov x20, x0 // DTB address | ||
| ldr x0, [sp, #16] // relocated _text address | ||
| mov x21, x0 | ||
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| /* | ||
| * Flush dcache covering current runtime addresses | ||
| * of kernel text/data. Then flush all of icache. | ||
| */ | ||
| adrp x1, _text | ||
| add x1, x1, #:lo12:_text | ||
| adrp x2, _edata | ||
| add x2, x2, #:lo12:_edata | ||
| sub x1, x2, x1 | ||
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| bl __flush_dcache_area | ||
| ic ialluis | ||
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| /* Turn off Dcache and MMU */ | ||
| mrs x0, CurrentEL | ||
| cmp x0, #PSR_MODE_EL2t | ||
| ccmp x0, #PSR_MODE_EL2h, #0x4, ne | ||
| b.ne 1f | ||
| mrs x0, sctlr_el2 | ||
| bic x0, x0, #1 << 0 // clear SCTLR.M | ||
| bic x0, x0, #1 << 2 // clear SCTLR.C | ||
| msr sctlr_el2, x0 | ||
| isb | ||
| b 2f | ||
| 1: | ||
| mrs x0, sctlr_el1 | ||
| bic x0, x0, #1 << 0 // clear SCTLR.M | ||
| bic x0, x0, #1 << 2 // clear SCTLR.C | ||
| msr sctlr_el1, x0 | ||
| isb | ||
| 2: | ||
| /* Jump to kernel entry point */ | ||
| mov x0, x20 | ||
| mov x1, xzr | ||
| mov x2, xzr | ||
| mov x3, xzr | ||
| br x21 | ||
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| efi_load_fail: | ||
| mov x0, #EFI_LOAD_ERROR | ||
| ldp x29, x30, [sp], #32 | ||
| ret | ||
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| ENDPROC(efi_stub_entry) |
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| /* | ||
| * Copyright (C) 2013, 2014 Linaro Ltd; <[email protected]> | ||
| * | ||
| * This file implements the EFI boot stub for the arm64 kernel. | ||
| * Adapted from ARM version by Mark Salter <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| */ | ||
| #include <linux/efi.h> | ||
| #include <linux/libfdt.h> | ||
| #include <asm/sections.h> | ||
| #include <generated/compile.h> | ||
| #include <generated/utsrelease.h> | ||
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| /* | ||
| * 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__) | ||
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| static void efi_char16_printk(efi_system_table_t *sys_table_arg, | ||
| efi_char16_t *str); | ||
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| static efi_status_t efi_open_volume(efi_system_table_t *sys_table, | ||
| void *__image, void **__fh); | ||
| static efi_status_t efi_file_close(void *handle); | ||
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| static efi_status_t | ||
| efi_file_read(void *handle, unsigned long *size, void *addr); | ||
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| static efi_status_t | ||
| efi_file_size(efi_system_table_t *sys_table, void *__fh, | ||
| efi_char16_t *filename_16, void **handle, u64 *file_sz); | ||
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| /* Include shared EFI stub code */ | ||
| #include "../../../drivers/firmware/efi/efi-stub-helper.c" | ||
| #include "../../../drivers/firmware/efi/fdt.c" | ||
| #include "../../../drivers/firmware/efi/arm-stub.c" | ||
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| static efi_status_t handle_kernel_image(efi_system_table_t *sys_table, | ||
| unsigned long *image_addr, | ||
| unsigned long *image_size, | ||
| unsigned long *reserve_addr, | ||
| unsigned long *reserve_size, | ||
| unsigned long dram_base, | ||
| efi_loaded_image_t *image) | ||
| { | ||
| efi_status_t status; | ||
| unsigned long kernel_size, kernel_memsize = 0; | ||
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| /* Relocate the image, if required. */ | ||
| kernel_size = _edata - _text; | ||
| if (*image_addr != (dram_base + TEXT_OFFSET)) { | ||
| kernel_memsize = kernel_size + (_end - _edata); | ||
| status = efi_relocate_kernel(sys_table, image_addr, | ||
| kernel_size, kernel_memsize, | ||
| dram_base + TEXT_OFFSET, | ||
| PAGE_SIZE); | ||
| if (status != EFI_SUCCESS) { | ||
| pr_efi_err(sys_table, "Failed to relocate kernel\n"); | ||
| return status; | ||
| } | ||
| if (*image_addr != (dram_base + TEXT_OFFSET)) { | ||
| pr_efi_err(sys_table, "Failed to alloc kernel memory\n"); | ||
| efi_free(sys_table, kernel_memsize, *image_addr); | ||
| return EFI_ERROR; | ||
| } | ||
| *image_size = kernel_memsize; | ||
| } | ||
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| return EFI_SUCCESS; | ||
| } |
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