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For the --generate operation, the --in <file> option is gone and there are three new required options: --vmlinuz <file> Embedded kernel image --config <file> Embedded kernel command-line parameters --bootloader <file> Embedded bootloader stub This takes the specified kernel, extracts the 32-bit component, and combines that with the configuration file (essentially just the kernel cmdline string) and the bootstub image . The resulting blob is signed and ready to put in a kernel partition. There's also an optional --padding parameter, to specify how much extra (unsigned) space to leave between the signature header and the kernel blob. The default is 0x4000, which is about four times as much needed when using the largest signature size we currently support. Review URL: http://codereview.chromium.org/2283005
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Constants describing the kernel blob content.
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#ifndef VBOOT_REFERENCE_KERNEL_BLOB_H_
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#define VBOOT_REFERENCE_KERNEL_BLOB_H_
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// Maximum kernel command-line size
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#define CROS_CONFIG_SIZE 4096
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// Size of the x86 zeropage table
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#define CROS_PARAMS_SIZE 4096
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// Alignment of various chunks within the kernel blob
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#define CROS_ALIGN 4096
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// RAM address where the 32-bit kernel expects to be started
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#define CROS_32BIT_ENTRY_ADDR 0x100000
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// Simplified version of the vmlinuz file header
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struct linux_kernel_header
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{
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uint8_t pad0[0x01f1 - 0x0];
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uint8_t setup_sects; // 1f1
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uint8_t pad1[0x0230 - 0x1f2];
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} __attribute__ ((packed));
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// Simplified version of the x86 kernel zeropage table
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struct linux_kernel_params
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{
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uint8_t pad0[0x01f1 - 0x0];
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uint8_t setup_sects; // 1f1
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uint8_t pad1[0x1fe - 0x1f2];
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uint16_t boot_flag; // 1fe
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uint8_t pad2[0x210 - 0x200];
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uint8_t type_of_loader; // 210
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uint8_t pad3[0x218 - 0x211];
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uint32_t ramdisk_image; // 218
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uint32_t ramdisk_size; // 21c
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uint8_t pad4[0x228 - 0x220];
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uint32_t cmd_line_ptr; // 228
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uint8_t pad5[0x0cd0 - 0x22c];
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} __attribute__ ((packed));
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#endif // VBOOT_REFERENCE_KERNEL_BLOB_H_
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