projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 81a0bc39 RF |
1 | /* |
| 2 | * Copyright (C) 2013 Linaro Ltd; <roy.franz@linaro.org> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | */ | |
| 9 | #include <linux/efi.h> | |
| 10 | #include <asm/efi.h> | |
| 11 | ||
| 2ec0f0a3 AB |
12 | efi_status_t check_platform_features(efi_system_table_t *sys_table_arg) |
| 13 | { | |
| 14 | int block; | |
| 15 | ||
| 16 | /* non-LPAE kernels can run anywhere */ | |
| 17 | if (!IS_ENABLED(CONFIG_ARM_LPAE)) | |
| 18 | return EFI_SUCCESS; | |
| 19 | ||
| 20 | /* LPAE kernels need compatible hardware */ | |
| 21 | block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0); | |
| 22 | if (block < 5) { | |
| 23 | pr_efi_err(sys_table_arg, "This LPAE kernel is not supported by your CPU\n"); | |
| 24 | return EFI_UNSUPPORTED; | |
| 25 | } | |
| 26 | return EFI_SUCCESS; | |
| 27 | } | |
| 28 | ||
| 81a0bc39 RF |
29 | efi_status_t handle_kernel_image(efi_system_table_t *sys_table, |
| 30 | unsigned long *image_addr, | |
| 31 | unsigned long *image_size, | |
| 32 | unsigned long *reserve_addr, | |
| 33 | unsigned long *reserve_size, | |
| 34 | unsigned long dram_base, | |
| 35 | efi_loaded_image_t *image) | |
| 36 | { | |
| 37 | unsigned long nr_pages; | |
| 38 | efi_status_t status; | |
| 39 | /* Use alloc_addr to tranlsate between types */ | |
| 40 | efi_physical_addr_t alloc_addr; | |
| 41 | ||
| 42 | /* | |
| 43 | * Verify that the DRAM base address is compatible with the ARM | |
| 44 | * boot protocol, which determines the base of DRAM by masking | |
| 45 | * off the low 27 bits of the address at which the zImage is | |
| 46 | * loaded. These assumptions are made by the decompressor, | |
| 47 | * before any memory map is available. | |
| 48 | */ | |
| 49 | dram_base = round_up(dram_base, SZ_128M); | |
| 50 | ||
| 51 | /* | |
| 52 | * Reserve memory for the uncompressed kernel image. This is | |
| 53 | * all that prevents any future allocations from conflicting | |
| 54 | * with the kernel. Since we can't tell from the compressed | |
| 55 | * image how much DRAM the kernel actually uses (due to BSS | |
| 56 | * size uncertainty) we allocate the maximum possible size. | |
| 57 | * Do this very early, as prints can cause memory allocations | |
| 58 | * that may conflict with this. | |
| 59 | */ | |
| 60 | alloc_addr = dram_base; | |
| 61 | *reserve_size = MAX_UNCOMP_KERNEL_SIZE; | |
| 62 | nr_pages = round_up(*reserve_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; | |
| 63 | status = sys_table->boottime->allocate_pages(EFI_ALLOCATE_ADDRESS, | |
| 64 | EFI_LOADER_DATA, | |
| 65 | nr_pages, &alloc_addr); | |
| 66 | if (status != EFI_SUCCESS) { | |
| 67 | *reserve_size = 0; | |
| 68 | pr_efi_err(sys_table, "Unable to allocate memory for uncompressed kernel.\n"); | |
| 69 | return status; | |
| 70 | } | |
| 71 | *reserve_addr = alloc_addr; | |
| 72 | ||
| 73 | /* | |
| 74 | * Relocate the zImage, so that it appears in the lowest 128 MB | |
| 75 | * memory window. | |
| 76 | */ | |
| 77 | *image_size = image->image_size; | |
| 78 | status = efi_relocate_kernel(sys_table, image_addr, *image_size, | |
| 79 | *image_size, | |
| 80 | dram_base + MAX_UNCOMP_KERNEL_SIZE, 0); | |
| 81 | if (status != EFI_SUCCESS) { | |
| 82 | pr_efi_err(sys_table, "Failed to relocate kernel.\n"); | |
| 83 | efi_free(sys_table, *reserve_size, *reserve_addr); | |
| 84 | *reserve_size = 0; | |
| 85 | return status; | |
| 86 | } | |
| 87 | ||
| 88 | /* | |
| 89 | * Check to see if we were able to allocate memory low enough | |
| 90 | * in memory. The kernel determines the base of DRAM from the | |
| 91 | * address at which the zImage is loaded. | |
| 92 | */ | |
| 93 | if (*image_addr + *image_size > dram_base + ZIMAGE_OFFSET_LIMIT) { | |
| 94 | pr_efi_err(sys_table, "Failed to relocate kernel, no low memory available.\n"); | |
| 95 | efi_free(sys_table, *reserve_size, *reserve_addr); | |
| 96 | *reserve_size = 0; | |
| 97 | efi_free(sys_table, *image_size, *image_addr); | |
| 98 | *image_size = 0; | |
| 99 | return EFI_LOAD_ERROR; | |
| 100 | } | |
| 101 | return EFI_SUCCESS; | |
| 102 | } |