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vba_bdb_init initializes the vboot context and decides what to do next based on the vboot register content. Possible actions are: 1. proceed to verify the current slot 2. reset to try the other slot 3. reset to recovery mode bdb_sprw_test demonstrates these actions. BUG=chrome-os-partner:51907 BRANCH=tot TEST=make runtests Change-Id: If72cdd575d09b9162a871f088064ca853b7fd74d Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/342604 Reviewed-by: Randall Spangler <rspangler@chromium.org>
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/* Copyright 2016 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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#include <stdint.h>
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#include "bdb.h"
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#include "bdb_api.h"
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#include "vboot_register.h"
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static int did_current_slot_fail(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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if (ctx->slot)
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return val & VBOOT_REGISTER_FAILED_RW_SECONDARY;
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else
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return val & VBOOT_REGISTER_FAILED_RW_PRIMARY;
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}
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static int did_other_slot_fail(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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if (ctx->slot)
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return val & VBOOT_REGISTER_FAILED_RW_PRIMARY;
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else
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return val & VBOOT_REGISTER_FAILED_RW_SECONDARY;
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}
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static void set_try_other_slot(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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if (ctx->slot)
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val &= ~VBOOT_REGISTER_TRY_SECONDARY_BDB;
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else
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val |= VBOOT_REGISTER_TRY_SECONDARY_BDB;
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vbe_set_vboot_register(VBOOT_REGISTER_PERSIST, val);
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}
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static void set_recovery_request(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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val |= VBOOT_REGISTER_RECOVERY_REQUEST;
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vbe_set_vboot_register(VBOOT_REGISTER_PERSIST, val);
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}
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static void get_current_slot(struct vba_context *ctx)
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{
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/* Assume SP-RO selects slot this way */
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ctx->slot = (vbe_get_vboot_register(VBOOT_REGISTER_PERSIST)
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& VBOOT_REGISTER_TRY_SECONDARY_BDB) ? 1 : 0;
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}
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static void set_current_slot_failed(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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if (ctx->slot)
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val |= VBOOT_REGISTER_FAILED_RW_SECONDARY;
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else
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val |= VBOOT_REGISTER_FAILED_RW_PRIMARY;
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vbe_set_vboot_register(VBOOT_REGISTER_PERSIST, val);
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}
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static void unset_current_slot_failed(struct vba_context *ctx)
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{
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uint32_t val = vbe_get_vboot_register(VBOOT_REGISTER_PERSIST);
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if (ctx->slot)
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val &= ~VBOOT_REGISTER_FAILED_RW_SECONDARY;
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else
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val &= ~VBOOT_REGISTER_FAILED_RW_PRIMARY;
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vbe_set_vboot_register(VBOOT_REGISTER_PERSIST, val);
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}
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int vba_bdb_init(struct vba_context *ctx)
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{
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/* Get current slot */
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get_current_slot(ctx);
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/* Check current slot failed or not at the last boot */
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if (!did_current_slot_fail(ctx)) {
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/* If not, we try this slot. Prepare for any accidents */
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set_current_slot_failed(ctx);
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return BDB_SUCCESS;
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}
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/* Check other slot failed or not at the previous boot */
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if (!did_other_slot_fail(ctx)) {
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/* If not, we try the other slot after reboot. */
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set_try_other_slot(ctx);
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return BDB_ERROR_TRY_OTHER_SLOT;
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} else {
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/* Otherwise, both slots are bad. Reboot to recovery */
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set_recovery_request(ctx);
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return BDB_ERROR_RECOVERY_REQUEST;
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}
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}
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int vba_bdb_finalize(struct vba_context *ctx)
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{
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/* Mark the current slot good */
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unset_current_slot_failed(ctx);
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/* Disable NVM bus */
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return BDB_SUCCESS;
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}
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void vba_bdb_fail(struct vba_context *ctx)
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{
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/* We can do some logging here if we want */
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/* Unconditionally reboot. FailedRW flag is already set.
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* At the next boot, bdb_init will decide what to do. */
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vbe_reset();
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}
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