1 /* Copyright 2010 The ChromiumOS Authors 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 * 5 * Constants describing the kernel blob content. 6 */ 7 8 #ifndef VBOOT_REFERENCE_KERNEL_BLOB_H_ 9 #define VBOOT_REFERENCE_KERNEL_BLOB_H_ 10 11 /* Linux vmlinuz header signature */ 12 #define VMLINUZ_HEADER_SIG 0x53726448 13 14 /* Maximum kernel command-line size */ 15 #define CROS_CONFIG_SIZE 4096 16 17 /* Size of the x86 zeropage table */ 18 #define CROS_PARAMS_SIZE 4096 19 20 /* Alignment of various chunks within the kernel blob */ 21 #define CROS_ALIGN 4096 22 23 /* Sentinel RAM address indicating that no entry address is specified */ 24 #define CROS_NO_ENTRY_ADDR (~0) 25 26 /* RAM address where the 32-bit kernel expects to be started */ 27 #define CROS_32BIT_ENTRY_ADDR 0x100000 28 29 /* Simplified version of x86 kernel e820 memory map entries */ 30 #define E820_ENTRY_MAX 128 31 #define E820_TYPE_RAM 1 32 #define E820_TYPE_RESERVED 2 33 34 struct linux_kernel_e820entry { 35 uint64_t start_addr; 36 uint64_t segment_size; 37 uint32_t segment_type; 38 } __attribute__((packed)); 39 40 /* Simplified version of the x86 kernel zeropage table */ 41 struct linux_kernel_params { 42 uint8_t pad0[0x1e8 - 0x0]; 43 uint8_t n_e820_entry; /* 1e8 */ 44 uint8_t pad1[0x1f1 - 0x1e9]; 45 uint8_t setup_sects; /* 1f1 */ 46 uint8_t pad2[0x1fe - 0x1f2]; 47 uint16_t boot_flag; /* 1fe */ 48 uint16_t jump; /* 200 */ 49 uint32_t header; /* 202 */ 50 uint16_t version; /* 206 */ 51 uint8_t pad3[0x210 - 0x208]; 52 uint8_t type_of_loader; /* 210 */ 53 uint8_t pad4[0x218 - 0x211]; 54 uint32_t ramdisk_image; /* 218 */ 55 uint32_t ramdisk_size; /* 21c */ 56 uint8_t pad5[0x228 - 0x220]; 57 uint32_t cmd_line_ptr; /* 228 */ 58 uint32_t ramdisk_max; /* 22c */ 59 uint32_t kernel_alignment; /* 230 */ 60 uint8_t relocatable_kernel; /* 234 */ 61 uint8_t min_alignment; /* 235 */ 62 uint8_t pad6[0x2d0 - 0x236]; 63 struct linux_kernel_e820entry 64 e820_entries[E820_ENTRY_MAX]; /* 2d0-cd0 */ 65 } __attribute__((packed)); 66 67 #endif /* VBOOT_REFERENCE_KERNEL_BLOB_H_ */ 68