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fc17308c39
Compiling in the GBB magic number as is causes any tools that search for the number to fail. This patch allows firmware to embed XOR'ed signature. TEST=Booted Nyan in normal mode. FAFT:firmware_DevMode passes. BUG=none BRANCH=none Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Change-Id: Id18905a9969af3db24151e7c51332d0e94405108 Reviewed-on: https://chromium-review.googlesource.com/205416 Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org> Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/* Copyright (c) 2014 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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* Misc functions which need access to vb2_context but are not public APIs
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*/
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#ifndef VBOOT_REFERENCE_VBOOT_2MISC_H_
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#define VBOOT_REFERENCE_VBOOT_2MISC_H_
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#include "2api.h"
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struct vb2_gbb_header;
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/**
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* Get the shared data pointer from the vboot context
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*
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* @param ctx Vboot context
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* @return The shared data pointer.
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*/
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static __inline struct vb2_shared_data *vb2_get_sd(struct vb2_context *ctx) {
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return (struct vb2_shared_data *)ctx->workbuf;
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}
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/**
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* Validate gbb signature (the magic number)
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*
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* @param sig pointer to the signature bytes to validate
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* @return VB2_SUCCESS if valid or VB2_ERROR_GBB_MAGIC otherwise.
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*/
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int vb2_validate_gbb_signature(uint8_t *sig);
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/**
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* Initialize a work buffer from the vboot context.
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*
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* This sets the work buffer to the unused portion of the context work buffer.
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*
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* @param ctx Vboot context
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* @param wb Work buffer to initialize
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*/
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void vb2_workbuf_from_ctx(struct vb2_context *ctx, struct vb2_workbuf *wb);
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/**
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* Read the GBB header.
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*
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* @param ctx Vboot context
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* @param gbb Destination for header
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* @return VB2_SUCCESS, or non-zero if error.
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*/
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int vb2_read_gbb_header(struct vb2_context *ctx, struct vb2_gbb_header *gbb);
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/**
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* Handle vboot failure.
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*
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* If the failure occurred after choosing a firmware slot, and the other
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* firmware slot is not known-bad, try the other firmware slot after reboot.
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*
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* If the failure occurred before choosing a firmware slot, or both slots have
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* failed in successive boots, request recovery.
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*
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* @param reason Recovery reason
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* @param subcode Recovery subcode
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*/
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void vb2_fail(struct vb2_context *ctx, uint8_t reason, uint8_t subcode);
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/**
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* Set up the verified boot context data, if not already set up.
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*
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* This uses ctx->workbuf_used=0 as a flag to indicate that the data has not
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* yet been set up. Caller must set that before calling any voot functions;
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* see 2api.h.
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*
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* @param ctx Vboot context to initialize
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_init_context(struct vb2_context *ctx);
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/**
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* Check for recovery reasons we can determine early in the boot process.
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*
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* On exit, check ctx->flags for VB2_CONTEXT_RECOVERY_MODE; if present, jump to
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* the recovery path instead of continuing with normal boot. This is the only
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* direct path to recovery mode. All other errors later in the boot process
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* should induce a reboot instead of jumping to recovery, so that recovery mode
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* starts from a consistent firmware state.
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*
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* @param ctx Vboot context
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*/
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void vb2_check_recovery(struct vb2_context *ctx);
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/**
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* Parse the GBB header.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_fw_parse_gbb(struct vb2_context *ctx);
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/**
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* Check developer switch position.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_check_dev_switch(struct vb2_context *ctx);
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/**
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* Check if we need to clear the TPM owner.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_check_tpm_clear(struct vb2_context *ctx);
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/**
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* Decide which firmware slot to try this boot.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_select_fw_slot(struct vb2_context *ctx);
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/**
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* Verify the firmware keyblock using the root key.
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*
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* After this call, the data key is stored in the work buffer.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_verify_fw_keyblock(struct vb2_context *ctx);
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/**
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* Verify the firmware preamble using the data subkey from the keyblock.
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*
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* After this call, the preamble is stored in the work buffer.
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*
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* @param ctx Vboot context
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* @return VB2_SUCCESS, or error code on error.
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*/
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int vb2_verify_fw_preamble2(struct vb2_context *ctx);
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#endif /* VBOOT_REFERENCE_VBOOT_2MISC_H_ */
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