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LoadKernel already returns the partition number for the selected kernel. This change makes it also return the GPT Entry's UniqueGuid, which will eventually be passed to the kernel itself, so the kernel can determine which of several possible devices it has booted from. It doesn't know for certain because the BIOS and the kernel may enumerate the devices in a different order. BUG=chromium-os:4984 Review URL: http://codereview.chromium.org/3056014
71 lines
3.1 KiB
C
71 lines
3.1 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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* High-level firmware API for loading and verifying kernel.
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* (Firmware Portion)
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*/
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#ifndef VBOOT_REFERENCE_LOAD_KERNEL_FW_H_
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#define VBOOT_REFERENCE_LOAD_KERNEL_FW_H_
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#include "sysincludes.h"
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/* Interface provided by verified boot library to BDS */
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/* Return codes for LoadKernel() */
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#define LOAD_KERNEL_SUCCESS 0 /* Success; good kernel found on device */
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#define LOAD_KERNEL_NOT_FOUND 1 /* No kernel found on device */
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#define LOAD_KERNEL_INVALID 2 /* Only invalid kernels found on device */
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#define LOAD_KERNEL_RECOVERY 3 /* Internal error; reboot to recovery mode */
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#define LOAD_KERNEL_REBOOT 4 /* Internal error; reboot to current mode */
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/* Boot flags for LoadKernel().boot_flags */
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#define BOOT_FLAG_DEVELOPER UINT64_C(0x01) /* Developer switch is on */
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#define BOOT_FLAG_RECOVERY UINT64_C(0x02) /* In recovery mode */
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#define BOOT_FLAG_SKIP_ADDR_CHECK UINT64_C(0x04) /* Skip check of kernel
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* buffer address */
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typedef struct LoadKernelParams {
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/* Inputs to LoadKernel() */
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void *header_sign_key_blob; /* Key blob used to sign the kernel header */
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uint64_t bytes_per_lba; /* Bytes per lba sector on current device */
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uint64_t ending_lba; /* Last addressable lba sector on current
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* device */
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void *kernel_buffer; /* Destination buffer for kernel
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* (normally at 0x100000) */
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uint64_t kernel_buffer_size; /* Size of kernel buffer in bytes */
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uint64_t boot_flags; /* Boot flags */
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/* Outputs from LoadKernel(); valid only if LoadKernel() returns
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* LOAD_KERNEL_SUCCESS */
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uint64_t partition_number; /* Partition number to boot on current device
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* (1...M) */
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uint64_t bootloader_address; /* Address of bootloader image in RAM */
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uint64_t bootloader_size; /* Size of bootloader image in bytes */
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uint8_t partition_guid[16]; /* UniquePartitionGuid for boot partition */
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} LoadKernelParams;
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int LoadKernel(LoadKernelParams* params);
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/* Attempts to load the kernel from the current device.
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*
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* Returns LOAD_KERNEL_SUCCESS if successful, error code on failure. */
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typedef struct KernelBootloaderOptions {
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/* The bootloader is loaded using the EFI LoadImage() and StartImage()
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* calls. Pass this struct via loaded_image->load_options. */
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uint64_t drive_number; /* Drive number of boot device (0...N) */
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uint64_t partition_number; /* Partition number, as returned from
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* LoadKernel() in
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* LoadKernelParams.partition_number */
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uint64_t original_address; /* Absolute bootloader start adddress,
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* as returned from LoadKernel() in
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* LoadKernelParams.bootloader_start */
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uint8_t partition_guid[16]; /* UniquePartitionGuid for boot partition */
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} KernelBootloaderOptions;
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#endif /* VBOOT_REFERENCE_LOAD_KERNEL_FW_H_ */
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