Amit Gandhi / mbed-dev_2

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platform/mbed_critical.c@153:fa9ff456f731, 2016-12-20 (annotated)

Committer:
<>
Date:
Tue Dec 20 17:27:56 2016 +0000
Revision:
153:fa9ff456f731
Parent:
149:156823d33999
Child:
160:d5399cc887bb
This updates the lib to the mbed lib v132

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /*
<> 149:156823d33999 2 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
<> 149:156823d33999 3 * SPDX-License-Identifier: Apache-2.0
<> 149:156823d33999 4 *
<> 149:156823d33999 5 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 149:156823d33999 6 * not use this file except in compliance with the License.
<> 149:156823d33999 7 * You may obtain a copy of the License at
<> 149:156823d33999 8 *
<> 149:156823d33999 9 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 10 *
<> 149:156823d33999 11 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 149:156823d33999 13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 14 * See the License for the specific language governing permissions and
<> 149:156823d33999 15 * limitations under the License.
<> 149:156823d33999 16 */
<> 149:156823d33999 17
<> 153:fa9ff456f731 18 /* Declare __STDC_LIMIT_MACROS so stdint.h defines UINT32_MAX when using C++ */
<> 153:fa9ff456f731 19 #define __STDC_LIMIT_MACROS
<> 149:156823d33999 20 #include "platform/critical.h"
<> 149:156823d33999 21
<> 149:156823d33999 22 #include "cmsis.h"
<> 149:156823d33999 23 #include "platform/mbed_assert.h"
<> 149:156823d33999 24 #include "platform/toolchain.h"
<> 149:156823d33999 25
<> 149:156823d33999 26 #define EXCLUSIVE_ACCESS (!defined (__CORTEX_M0) && !defined (__CORTEX_M0PLUS))
<> 149:156823d33999 27
<> 149:156823d33999 28 static volatile uint32_t interrupt_enable_counter = 0;
<> 149:156823d33999 29 static volatile bool critical_interrupts_disabled = false;
<> 149:156823d33999 30
<> 149:156823d33999 31 bool core_util_are_interrupts_enabled(void)
<> 149:156823d33999 32 {
<> 149:156823d33999 33 #if defined(__CORTEX_A9)
<> 149:156823d33999 34 return ((__get_CPSR() & 0x80) == 0);
<> 149:156823d33999 35 #else
<> 149:156823d33999 36 return ((__get_PRIMASK() & 0x1) == 0);
<> 149:156823d33999 37 #endif
<> 149:156823d33999 38 }
<> 149:156823d33999 39
<> 149:156823d33999 40 MBED_WEAK void core_util_critical_section_enter(void)
<> 149:156823d33999 41 {
<> 149:156823d33999 42 bool interrupts_disabled = !core_util_are_interrupts_enabled();
<> 149:156823d33999 43 __disable_irq();
<> 149:156823d33999 44
<> 149:156823d33999 45 /* Save the interrupt disabled state as it was prior to any nested critical section lock use */
<> 149:156823d33999 46 if (!interrupt_enable_counter) {
<> 149:156823d33999 47 critical_interrupts_disabled = interrupts_disabled;
<> 149:156823d33999 48 }
<> 149:156823d33999 49
<> 149:156823d33999 50 /* If the interrupt_enable_counter overflows or we are in a nested critical section and interrupts
<> 149:156823d33999 51 are enabled, then something has gone badly wrong thus assert an error.
<> 149:156823d33999 52 */
<> 149:156823d33999 53 MBED_ASSERT(interrupt_enable_counter < UINT32_MAX);
<> 149:156823d33999 54 // FIXME
<> 149:156823d33999 55 #ifndef FEATURE_UVISOR
<> 149:156823d33999 56 if (interrupt_enable_counter > 0) {
<> 149:156823d33999 57 MBED_ASSERT(interrupts_disabled);
<> 149:156823d33999 58 }
<> 149:156823d33999 59 #else
<> 149:156823d33999 60 #warning "core_util_critical_section_enter needs fixing to work from unprivileged code"
<> 149:156823d33999 61 #endif /* FEATURE_UVISOR */
<> 149:156823d33999 62 interrupt_enable_counter++;
<> 149:156823d33999 63 }
<> 149:156823d33999 64
<> 149:156823d33999 65 MBED_WEAK void core_util_critical_section_exit(void)
<> 149:156823d33999 66 {
<> 149:156823d33999 67 /* If critical_section_enter has not previously been called, do nothing */
<> 149:156823d33999 68 if (interrupt_enable_counter) {
<> 149:156823d33999 69
<> 149:156823d33999 70 // FIXME
<> 149:156823d33999 71 #ifndef FEATURE_UVISOR
<> 149:156823d33999 72 bool interrupts_disabled = !core_util_are_interrupts_enabled(); /* get the current interrupt disabled state */
<> 149:156823d33999 73
<> 149:156823d33999 74 MBED_ASSERT(interrupts_disabled); /* Interrupts must be disabled on invoking an exit from a critical section */
<> 149:156823d33999 75 #else
<> 149:156823d33999 76 #warning "core_util_critical_section_exit needs fixing to work from unprivileged code"
<> 149:156823d33999 77 #endif /* FEATURE_UVISOR */
<> 149:156823d33999 78
<> 149:156823d33999 79 interrupt_enable_counter--;
<> 149:156823d33999 80
<> 149:156823d33999 81 /* Only re-enable interrupts if we are exiting the last of the nested critical sections and
<> 149:156823d33999 82 interrupts were enabled on entry to the first critical section.
<> 149:156823d33999 83 */
<> 149:156823d33999 84 if (!interrupt_enable_counter && !critical_interrupts_disabled) {
<> 149:156823d33999 85 __enable_irq();
<> 149:156823d33999 86 }
<> 149:156823d33999 87 }
<> 149:156823d33999 88 }
<> 149:156823d33999 89
<> 149:156823d33999 90 #if EXCLUSIVE_ACCESS
<> 149:156823d33999 91
<> 149:156823d33999 92 /* Supress __ldrex and __strex deprecated warnings - "#3731-D: intrinsic is deprecated" */
<> 149:156823d33999 93 #if defined (__CC_ARM)
<> 149:156823d33999 94 #pragma diag_suppress 3731
<> 149:156823d33999 95 #endif
<> 149:156823d33999 96
<> 149:156823d33999 97 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
<> 149:156823d33999 98 {
<> 149:156823d33999 99 uint8_t currentValue = __LDREXB((volatile uint8_t*)ptr);
<> 149:156823d33999 100 if (currentValue != *expectedCurrentValue) {
<> 149:156823d33999 101 *expectedCurrentValue = currentValue;
<> 149:156823d33999 102 __CLREX();
<> 149:156823d33999 103 return false;
<> 149:156823d33999 104 }
<> 149:156823d33999 105
<> 149:156823d33999 106 return !__STREXB(desiredValue, (volatile uint8_t*)ptr);
<> 149:156823d33999 107 }
<> 149:156823d33999 108
<> 149:156823d33999 109 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
<> 149:156823d33999 110 {
<> 149:156823d33999 111 uint16_t currentValue = __LDREXH((volatile uint16_t*)ptr);
<> 149:156823d33999 112 if (currentValue != *expectedCurrentValue) {
<> 149:156823d33999 113 *expectedCurrentValue = currentValue;
<> 149:156823d33999 114 __CLREX();
<> 149:156823d33999 115 return false;
<> 149:156823d33999 116 }
<> 149:156823d33999 117
<> 149:156823d33999 118 return !__STREXH(desiredValue, (volatile uint16_t*)ptr);
<> 149:156823d33999 119 }
<> 149:156823d33999 120
<> 149:156823d33999 121
<> 149:156823d33999 122 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
<> 149:156823d33999 123 {
<> 149:156823d33999 124 uint32_t currentValue = __LDREXW((volatile uint32_t*)ptr);
<> 149:156823d33999 125 if (currentValue != *expectedCurrentValue) {
<> 149:156823d33999 126 *expectedCurrentValue = currentValue;
<> 149:156823d33999 127 __CLREX();
<> 149:156823d33999 128 return false;
<> 149:156823d33999 129 }
<> 149:156823d33999 130
<> 149:156823d33999 131 return !__STREXW(desiredValue, (volatile uint32_t*)ptr);
<> 149:156823d33999 132 }
<> 149:156823d33999 133
<> 149:156823d33999 134 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
<> 149:156823d33999 135 {
<> 149:156823d33999 136 uint8_t newValue;
<> 149:156823d33999 137 do {
<> 149:156823d33999 138 newValue = __LDREXB((volatile uint8_t*)valuePtr) + delta;
<> 149:156823d33999 139 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
<> 149:156823d33999 140 return newValue;
<> 149:156823d33999 141 }
<> 149:156823d33999 142
<> 149:156823d33999 143 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
<> 149:156823d33999 144 {
<> 149:156823d33999 145 uint16_t newValue;
<> 149:156823d33999 146 do {
<> 149:156823d33999 147 newValue = __LDREXH((volatile uint16_t*)valuePtr) + delta;
<> 149:156823d33999 148 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
<> 149:156823d33999 149 return newValue;
<> 149:156823d33999 150 }
<> 149:156823d33999 151
<> 149:156823d33999 152 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
<> 149:156823d33999 153 {
<> 149:156823d33999 154 uint32_t newValue;
<> 149:156823d33999 155 do {
<> 149:156823d33999 156 newValue = __LDREXW((volatile uint32_t*)valuePtr) + delta;
<> 149:156823d33999 157 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
<> 149:156823d33999 158 return newValue;
<> 149:156823d33999 159 }
<> 149:156823d33999 160
<> 149:156823d33999 161
<> 149:156823d33999 162 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
<> 149:156823d33999 163 {
<> 149:156823d33999 164 uint8_t newValue;
<> 149:156823d33999 165 do {
<> 149:156823d33999 166 newValue = __LDREXB((volatile uint8_t*)valuePtr) - delta;
<> 149:156823d33999 167 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
<> 149:156823d33999 168 return newValue;
<> 149:156823d33999 169 }
<> 149:156823d33999 170
<> 149:156823d33999 171 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
<> 149:156823d33999 172 {
<> 149:156823d33999 173 uint16_t newValue;
<> 149:156823d33999 174 do {
<> 149:156823d33999 175 newValue = __LDREXH((volatile uint16_t*)valuePtr) - delta;
<> 149:156823d33999 176 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
<> 149:156823d33999 177 return newValue;
<> 149:156823d33999 178 }
<> 149:156823d33999 179
<> 149:156823d33999 180 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
<> 149:156823d33999 181 {
<> 149:156823d33999 182 uint32_t newValue;
<> 149:156823d33999 183 do {
<> 149:156823d33999 184 newValue = __LDREXW((volatile uint32_t*)valuePtr) - delta;
<> 149:156823d33999 185 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
<> 149:156823d33999 186 return newValue;
<> 149:156823d33999 187 }
<> 149:156823d33999 188
<> 149:156823d33999 189 #else
<> 149:156823d33999 190
<> 149:156823d33999 191 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
<> 149:156823d33999 192 {
<> 149:156823d33999 193 bool success;
<> 149:156823d33999 194 uint8_t currentValue;
<> 149:156823d33999 195 core_util_critical_section_enter();
<> 149:156823d33999 196 currentValue = *ptr;
<> 149:156823d33999 197 if (currentValue == *expectedCurrentValue) {
<> 149:156823d33999 198 *ptr = desiredValue;
<> 149:156823d33999 199 success = true;
<> 149:156823d33999 200 } else {
<> 149:156823d33999 201 *expectedCurrentValue = currentValue;
<> 149:156823d33999 202 success = false;
<> 149:156823d33999 203 }
<> 149:156823d33999 204 core_util_critical_section_exit();
<> 149:156823d33999 205 return success;
<> 149:156823d33999 206 }
<> 149:156823d33999 207
<> 149:156823d33999 208 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
<> 149:156823d33999 209 {
<> 149:156823d33999 210 bool success;
<> 149:156823d33999 211 uint16_t currentValue;
<> 149:156823d33999 212 core_util_critical_section_enter();
<> 149:156823d33999 213 currentValue = *ptr;
<> 149:156823d33999 214 if (currentValue == *expectedCurrentValue) {
<> 149:156823d33999 215 *ptr = desiredValue;
<> 149:156823d33999 216 success = true;
<> 149:156823d33999 217 } else {
<> 149:156823d33999 218 *expectedCurrentValue = currentValue;
<> 149:156823d33999 219 success = false;
<> 149:156823d33999 220 }
<> 149:156823d33999 221 core_util_critical_section_exit();
<> 149:156823d33999 222 return success;
<> 149:156823d33999 223 }
<> 149:156823d33999 224
<> 149:156823d33999 225
<> 149:156823d33999 226 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
<> 149:156823d33999 227 {
<> 149:156823d33999 228 bool success;
<> 149:156823d33999 229 uint32_t currentValue;
<> 149:156823d33999 230 core_util_critical_section_enter();
<> 149:156823d33999 231 currentValue = *ptr;
<> 149:156823d33999 232 if (currentValue == *expectedCurrentValue) {
<> 149:156823d33999 233 *ptr = desiredValue;
<> 149:156823d33999 234 success = true;
<> 149:156823d33999 235 } else {
<> 149:156823d33999 236 *expectedCurrentValue = currentValue;
<> 149:156823d33999 237 success = false;
<> 149:156823d33999 238 }
<> 149:156823d33999 239 core_util_critical_section_exit();
<> 149:156823d33999 240 return success;
<> 149:156823d33999 241 }
<> 149:156823d33999 242
<> 149:156823d33999 243
<> 149:156823d33999 244 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
<> 149:156823d33999 245 {
<> 149:156823d33999 246 uint8_t newValue;
<> 149:156823d33999 247 core_util_critical_section_enter();
<> 149:156823d33999 248 newValue = *valuePtr + delta;
<> 149:156823d33999 249 *valuePtr = newValue;
<> 149:156823d33999 250 core_util_critical_section_exit();
<> 149:156823d33999 251 return newValue;
<> 149:156823d33999 252 }
<> 149:156823d33999 253
<> 149:156823d33999 254 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
<> 149:156823d33999 255 {
<> 149:156823d33999 256 uint16_t newValue;
<> 149:156823d33999 257 core_util_critical_section_enter();
<> 149:156823d33999 258 newValue = *valuePtr + delta;
<> 149:156823d33999 259 *valuePtr = newValue;
<> 149:156823d33999 260 core_util_critical_section_exit();
<> 149:156823d33999 261 return newValue;
<> 149:156823d33999 262 }
<> 149:156823d33999 263
<> 149:156823d33999 264 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
<> 149:156823d33999 265 {
<> 149:156823d33999 266 uint32_t newValue;
<> 149:156823d33999 267 core_util_critical_section_enter();
<> 149:156823d33999 268 newValue = *valuePtr + delta;
<> 149:156823d33999 269 *valuePtr = newValue;
<> 149:156823d33999 270 core_util_critical_section_exit();
<> 149:156823d33999 271 return newValue;
<> 149:156823d33999 272 }
<> 149:156823d33999 273
<> 149:156823d33999 274
<> 149:156823d33999 275 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
<> 149:156823d33999 276 {
<> 149:156823d33999 277 uint8_t newValue;
<> 149:156823d33999 278 core_util_critical_section_enter();
<> 149:156823d33999 279 newValue = *valuePtr - delta;
<> 149:156823d33999 280 *valuePtr = newValue;
<> 149:156823d33999 281 core_util_critical_section_exit();
<> 149:156823d33999 282 return newValue;
<> 149:156823d33999 283 }
<> 149:156823d33999 284
<> 149:156823d33999 285 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
<> 149:156823d33999 286 {
<> 149:156823d33999 287 uint16_t newValue;
<> 149:156823d33999 288 core_util_critical_section_enter();
<> 149:156823d33999 289 newValue = *valuePtr - delta;
<> 149:156823d33999 290 *valuePtr = newValue;
<> 149:156823d33999 291 core_util_critical_section_exit();
<> 149:156823d33999 292 return newValue;
<> 149:156823d33999 293 }
<> 149:156823d33999 294
<> 149:156823d33999 295 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
<> 149:156823d33999 296 {
<> 149:156823d33999 297 uint32_t newValue;
<> 149:156823d33999 298 core_util_critical_section_enter();
<> 149:156823d33999 299 newValue = *valuePtr - delta;
<> 149:156823d33999 300 *valuePtr = newValue;
<> 149:156823d33999 301 core_util_critical_section_exit();
<> 149:156823d33999 302 return newValue;
<> 149:156823d33999 303 }
<> 149:156823d33999 304
<> 149:156823d33999 305 #endif
<> 149:156823d33999 306
<> 149:156823d33999 307
<> 149:156823d33999 308 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue) {
<> 149:156823d33999 309 return core_util_atomic_cas_u32(
<> 149:156823d33999 310 (uint32_t *)ptr,
<> 149:156823d33999 311 (uint32_t *)expectedCurrentValue,
<> 149:156823d33999 312 (uint32_t)desiredValue);
<> 149:156823d33999 313 }
<> 149:156823d33999 314
<> 149:156823d33999 315 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta) {
<> 149:156823d33999 316 return (void *)core_util_atomic_incr_u32((uint32_t *)valuePtr, (uint32_t)delta);
<> 149:156823d33999 317 }
<> 149:156823d33999 318
<> 149:156823d33999 319 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta) {
<> 149:156823d33999 320 return (void *)core_util_atomic_decr_u32((uint32_t *)valuePtr, (uint32_t)delta);
<> 149:156823d33999 321 }
<> 149:156823d33999 322