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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Auxiliary firmware (auxfw) sync routines for vboot.
*/
#include "2api.h"
#include "2common.h"
#include "2misc.h"
/**
* Determine if we are allowed to update auxfw.
*
* @param ctx Vboot2 context
* @return boolean (true iff we can update auxfw)
*/
static int auxfw_sync_allowed(struct vb2_context *ctx)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
/* Reasons not to do sync at all */
if (gbb->flags & VB2_GBB_FLAG_DISABLE_AUXFW_SOFTWARE_SYNC)
return 0;
if (ctx->flags & VB2_CONTEXT_RECOVERY_MODE)
return 0;
return 1;
}
/**
* Decides if auxfw sync is allowed to be performed.
*
* If sync is allowed, invokes the external callback,
* vb2ex_auxfw_check() to allow the client to decide on the auxfw
* update severity.
*
* @param ctx Vboot2 context
* @return VB2_SUCCESS, or non-zero error code.
*/
static vb2_error_t auxfw_sync_check_update(struct vb2_context *ctx,
enum vb2_auxfw_update_severity *severity)
{
if (!auxfw_sync_allowed(ctx)) {
*severity = VB2_AUXFW_NO_UPDATE;
return VB2_SUCCESS;
}
return vb2ex_auxfw_check(severity);
}
vb2_error_t vb2api_auxfw_sync(struct vb2_context *ctx)
{
enum vb2_auxfw_update_severity fw_update = VB2_AUXFW_NO_UPDATE;
/* Check for update severity */
VB2_TRY(auxfw_sync_check_update(ctx, &fw_update));
if (fw_update > VB2_AUXFW_NO_UPDATE) {
VB2_DEBUG("Updating auxfw\n");
VB2_TRY(vb2ex_auxfw_update(), ctx, VB2_RECOVERY_AUXFW_UPDATE);
/*
* auxfw update is applied successfully. Request EC reboot to
* RO, so that the chips that had FW update get reset to a
* clean state.
*/
return VB2_REQUEST_REBOOT_EC_TO_RO;
}
return vb2ex_auxfw_finalize(ctx);
}
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