1// Copyright 2017 The Fuchsia Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include <gpt/cros.h> 6 7#include <gpt/gpt.h> 8#include <string.h> 9 10#define PRIORITY_SHIFT 48 11#define PRIORITY_MASK (15ull << PRIORITY_SHIFT) 12 13#define TRIES_SHIFT 52 14#define TRIES_MASK (15ull << TRIES_SHIFT) 15 16#define SUCCESSFUL_SHIFT 56 17#define SUCCESSFUL_MASK (1ull << SUCCESSFUL_SHIFT) 18 19bool gpt_cros_is_kernel_guid(const uint8_t* guid, size_t len) { 20 static const uint8_t kernel_guid[GPT_GUID_LEN] = GUID_CROS_KERNEL_VALUE; 21 return len == GPT_GUID_LEN && !memcmp(guid, kernel_guid, GPT_GUID_LEN); 22} 23 24bool gpt_cros_attr_get_successful(uint64_t flags) { 25 return flags & SUCCESSFUL_MASK; 26} 27 28void gpt_cros_attr_set_successful(uint64_t* flags, bool successful) { 29 *flags = (*flags & ~SUCCESSFUL_MASK) | ((uint64_t)successful << SUCCESSFUL_SHIFT); 30} 31 32uint8_t gpt_cros_attr_get_tries(uint64_t flags) { 33 return (flags & TRIES_MASK) >> TRIES_SHIFT; 34} 35 36int gpt_cros_attr_set_tries(uint64_t* flags, uint8_t tries) { 37 if (tries >= 16) { 38 return -1; 39 } 40 41 *flags = (*flags & ~TRIES_MASK) | ((uint64_t)tries << TRIES_SHIFT); 42 return 0; 43} 44 45uint8_t gpt_cros_attr_get_priority(uint64_t flags) { 46 return (flags & PRIORITY_MASK) >> PRIORITY_SHIFT; 47} 48 49int gpt_cros_attr_set_priority(uint64_t* flags, uint8_t priority) { 50 if (priority >= 16) { 51 return -1; 52 } 53 54 *flags = (*flags & ~PRIORITY_MASK) | ((uint64_t)priority << PRIORITY_SHIFT); 55 return 0; 56} 57