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// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <gpt/cros.h>
#include <gpt/c/gpt.h>
#include <string.h>
namespace gpt {
namespace {
constexpr uint8_t kPriorityShift = 48;
constexpr uint64_t kPriorityMask = 15ull << kPriorityShift;
constexpr uint8_t kTriesShift = 52;
constexpr uint64_t kTriesMask = 15ull << kTriesShift;
constexpr uint8_t kSuccessfulShift = 56;
constexpr uint64_t kSuccessfulMask = 1ull << kSuccessfulShift;
} // namespace
__BEGIN_CDECLS
bool gpt_cros_is_kernel_guid(const uint8_t* guid, size_t len) {
static const uint8_t kernel_guid[GPT_GUID_LEN] = GUID_CROS_KERNEL_VALUE;
return len == GPT_GUID_LEN && !memcmp(guid, kernel_guid, GPT_GUID_LEN);
}
bool gpt_cros_attr_get_successful(uint64_t flags) { return flags & kSuccessfulMask; }
void gpt_cros_attr_set_successful(uint64_t* flags, bool successful) {
*flags = (*flags & ~kSuccessfulMask) | ((uint64_t)successful << kSuccessfulShift);
}
uint8_t gpt_cros_attr_get_tries(uint64_t flags) { return (flags & kTriesMask) >> kTriesShift; }
int gpt_cros_attr_set_tries(uint64_t* flags, uint8_t tries) {
if (tries >= 16) {
return -1;
}
*flags = (*flags & ~kTriesMask) | ((uint64_t)tries << kTriesShift);
return 0;
}
uint8_t gpt_cros_attr_get_priority(uint64_t flags) {
return (flags & kPriorityMask) >> kPriorityShift;
}
int gpt_cros_attr_set_priority(uint64_t* flags, uint8_t priority) {
if (priority >= 16) {
return -1;
}
*flags = (*flags & ~kPriorityMask) | ((uint64_t)priority << kPriorityShift);
return 0;
}
__END_CDECLS
} // namespace gpt