1 /* 2 * Copyright (c) 2009-2022 Huawei Technologies Co., Ltd. All rights reserved. 3 * 4 * UniProton is licensed under Mulan PSL v2. 5 * You can use this software according to the terms and conditions of the Mulan PSL v2. 6 * You may obtain a copy of Mulan PSL v2 at: 7 * http://license.coscl.org.cn/MulanPSL2 8 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, 9 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, 10 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. 11 * See the Mulan PSL v2 for more details. 12 * Create: 2009-12-22 13 * Description: System base function implementation 14 */ 15 #include "prt_attr_external.h" 16 #include "prt_sys_external.h" 17 18 /* 用户注册的获取系统时间钩子 */ 19 OS_SEC_BSS SysTimeFunc g_sysTimeHook; 20 OsSetSysTimeHook(SysTimeFunc hook)21OS_SEC_L2_TEXT U32 OsSetSysTimeHook(SysTimeFunc hook) 22 { 23 /* 钩子不支持重复注册 */ 24 if (g_sysTimeHook != NULL) { 25 return OS_ERRNO_SYS_TIME_HOOK_REGISTER_REPEATED; 26 } 27 g_sysTimeHook = hook; 28 return OS_OK; 29 } 30 31 /* 32 * 描述：当前系统时间 33 */ OsCurCycleGet64(void)34OS_SEC_L2_TEXT U64 OsCurCycleGet64(void) 35 { 36 if (g_sysTimeHook != NULL) { 37 return g_sysTimeHook(); 38 } else { 39 return 0; 40 } 41 } 42 43 /* 44 * 描述：获取当前的tick计数 45 */ PRT_TickGetCount(void)46OS_SEC_L2_TEXT U64 PRT_TickGetCount(void) 47 { 48 return g_uniTicks; 49 } 50 51 /* 52 * 描述：根据输入的周期数进行延时 53 */ OsTimerDelayCount(U64 cycles)54OS_SEC_ALW_INLINE INLINE void OsTimerDelayCount(U64 cycles) 55 { 56 U64 cur; 57 U64 end; 58 59 cur = OsCurCycleGet64(); 60 end = cur + cycles; 61 62 if (cur < end) { 63 while (cur < end) { 64 cur = OsCurCycleGet64(); 65 } 66 } else { 67 /* 考虑Cycle计数反转的问题，虽然64位的计数需要584年才能反转，但是考虑软件的严密性，需要做反转保护 */ 68 /* 当前值大于结束值的场景 */ 69 while (cur > end) { 70 cur = OsCurCycleGet64(); 71 } 72 /* 正过来之后追赶的场景 */ 73 while (cur < end) { 74 cur = OsCurCycleGet64(); 75 } 76 } 77 } 78 79 /* 80 * 描述：时间延迟毫秒 81 */ PRT_ClkDelayMs(U32 delay)82OS_SEC_L2_TEXT void PRT_ClkDelayMs(U32 delay) 83 { 84 U64 cycles; 85 86 /* 将毫秒转化为Cycle计数，例如1m为1M个cycle */ 87 cycles = OS_MS2CYCLE(delay, g_systemClock); 88 89 OsTimerDelayCount(cycles); 90 } 91 92 /* 93 * 描述：时间延迟微秒 94 */ PRT_ClkDelayUs(U32 delay)95OS_SEC_L4_TEXT void PRT_ClkDelayUs(U32 delay) 96 { 97 U64 cycles; 98 99 cycles = OS_US2CYCLE(delay, g_systemClock); 100 101 OsTimerDelayCount(cycles); 102 } 103