projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 3c7f2550 MS |
1 | /* |
| 2 | * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org> | |
| 3 | * | |
| 4 | * This file implements the EFI boot stub for the arm64 kernel. | |
| 5 | * Adapted from ARM version by Mark Salter <msalter@redhat.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | * | |
| 11 | */ | |
| 12 | #include <linux/efi.h> | |
| a13b0077 | 13 | #include <asm/efi.h> |
| 3c7f2550 | 14 | #include <asm/sections.h> |
| 3c7f2550 | 15 | |
| e38457c3 | 16 | efi_status_t __init handle_kernel_image(efi_system_table_t *sys_table_arg, |
| ddeeefe2 AB |
17 | unsigned long *image_addr, |
| 18 | unsigned long *image_size, | |
| 19 | unsigned long *reserve_addr, | |
| 20 | unsigned long *reserve_size, | |
| 21 | unsigned long dram_base, | |
| 22 | efi_loaded_image_t *image) | |
| 3c7f2550 MS |
23 | { |
| 24 | efi_status_t status; | |
| 25 | unsigned long kernel_size, kernel_memsize = 0; | |
| e38457c3 AB |
26 | unsigned long nr_pages; |
| 27 | void *old_image_addr = (void *)*image_addr; | |
| 73effccb AB |
28 | unsigned long preferred_offset; |
| 29 | ||
| 30 | /* | |
| 31 | * The preferred offset of the kernel Image is TEXT_OFFSET bytes beyond | |
| 32 | * a 2 MB aligned base, which itself may be lower than dram_base, as | |
| 33 | * long as the resulting offset equals or exceeds it. | |
| 34 | */ | |
| 35 | preferred_offset = round_down(dram_base, SZ_2M) + TEXT_OFFSET; | |
| 36 | if (preferred_offset < dram_base) | |
| 37 | preferred_offset += SZ_2M; | |
| 3c7f2550 MS |
38 | |
| 39 | /* Relocate the image, if required. */ | |
| 40 | kernel_size = _edata - _text; | |
| 73effccb | 41 | if (*image_addr != preferred_offset) { |
| 3c7f2550 | 42 | kernel_memsize = kernel_size + (_end - _edata); |
| e38457c3 AB |
43 | |
| 44 | /* | |
| 45 | * First, try a straight allocation at the preferred offset. | |
| 46 | * This will work around the issue where, if dram_base == 0x0, | |
| 47 | * efi_low_alloc() refuses to allocate at 0x0 (to prevent the | |
| 48 | * address of the allocation to be mistaken for a FAIL return | |
| 49 | * value or a NULL pointer). It will also ensure that, on | |
| 50 | * platforms where the [dram_base, dram_base + TEXT_OFFSET) | |
| 51 | * interval is partially occupied by the firmware (like on APM | |
| 52 | * Mustang), we can still place the kernel at the address | |
| 53 | * 'dram_base + TEXT_OFFSET'. | |
| 54 | */ | |
| 73effccb | 55 | *image_addr = *reserve_addr = preferred_offset; |
| e38457c3 AB |
56 | nr_pages = round_up(kernel_memsize, EFI_ALLOC_ALIGN) / |
| 57 | EFI_PAGE_SIZE; | |
| 58 | status = efi_call_early(allocate_pages, EFI_ALLOCATE_ADDRESS, | |
| 59 | EFI_LOADER_DATA, nr_pages, | |
| 60 | (efi_physical_addr_t *)reserve_addr); | |
| 3c7f2550 | 61 | if (status != EFI_SUCCESS) { |
| e38457c3 AB |
62 | kernel_memsize += TEXT_OFFSET; |
| 63 | status = efi_low_alloc(sys_table_arg, kernel_memsize, | |
| 64 | SZ_2M, reserve_addr); | |
| 65 | ||
| 66 | if (status != EFI_SUCCESS) { | |
| 67 | pr_efi_err(sys_table_arg, "Failed to relocate kernel\n"); | |
| 68 | return status; | |
| 69 | } | |
| 70 | *image_addr = *reserve_addr + TEXT_OFFSET; | |
| 3c7f2550 | 71 | } |
| e38457c3 AB |
72 | memcpy((void *)*image_addr, old_image_addr, kernel_size); |
| 73 | *reserve_size = kernel_memsize; | |
| 3c7f2550 MS |
74 | } |
| 75 | ||
| 76 | ||
| 77 | return EFI_SUCCESS; | |
| 78 | } |