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55 <div id="projectbrief">CMSIS-Core support for Cortex-A processor-based devices</div>
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130 <div class="headertitle"><div class="title">Startup File startup_<Device>.c </div></div>
132 <div class="contents">
133 <div class="textblock"><p>The <a class="el" href="startup_c_pg.html">Startup File startup_<Device>.c</a> contains:</p><ul>
134 <li>Exception vectors of the Cortex-A Processor with weak functions that implement default routines.</li>
135 <li>The reset handler which is executed after CPU reset and typically calls the <a class="el" href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a> function.</li>
136 <li>The setup values for the various stack pointers, i.e. per exceptional mode and main stack.</li>
138 <p>The file exists for each supported toolchain and is the only tool-chain specific CMSIS file.</p>
139 <h1><a class="anchor" id="startup_c_sec"></a>
140 startup_Device.c Template File</h1>
141 <p>An Arm Compiler specific startup file for an Armv7-A processor like Cortex-A9 is shown below. The files for other compiler vendors differ slightly in the syntax, but not in the overall structure.</p>
142 <pre class="fragment">/******************************************************************************
143 * @file startup_<Device>.c
144 * @brief CMSIS Cortex-A Device Startup
146 * @date 10. January 2018
147 ******************************************************************************/
149 * Copyright (c) 2009-2018 Arm Limited. All rights reserved.
151 * SPDX-License-Identifier: Apache-2.0
153 * Licensed under the Apache License, Version 2.0 (the License); you may
154 * not use this file except in compliance with the License.
155 * You may obtain a copy of the License at
157 * www.apache.org/licenses/LICENSE-2.0
159 * Unless required by applicable law or agreed to in writing, software
160 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
161 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
162 * See the License for the specific language governing permissions and
163 * limitations under the License.
166 #include "<Device>.h" /* ToDo: replace '<Device>' with your device name */
168 /*----------------------------------------------------------------------------
170 *----------------------------------------------------------------------------*/
171 #define USR_MODE 0x10 // User mode
172 #define FIQ_MODE 0x11 // Fast Interrupt Request mode
173 #define IRQ_MODE 0x12 // Interrupt Request mode
174 #define SVC_MODE 0x13 // Supervisor mode
175 #define ABT_MODE 0x17 // Abort mode
176 #define UND_MODE 0x1B // Undefined Instruction mode
177 #define SYS_MODE 0x1F // System mode
179 /*----------------------------------------------------------------------------
181 *----------------------------------------------------------------------------*/
182 void Vectors (void) __attribute__ ((section("RESET")));
183 void Reset_Handler (void);
185 /*----------------------------------------------------------------------------
186 Exception / Interrupt Handler
187 *----------------------------------------------------------------------------*/
188 void Undef_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
189 void SVC_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
190 void PAbt_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
191 void DAbt_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
192 void IRQ_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
193 void FIQ_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
195 /*----------------------------------------------------------------------------
196 Exception / Interrupt Vector Table
197 *----------------------------------------------------------------------------*/
198 __ASM void Vectors(void) {
205 LDR PC, =Reset_Handler
206 LDR PC, =Undef_Handler
208 LDR PC, =PAbt_Handler
209 LDR PC, =DAbt_Handler
215 /*----------------------------------------------------------------------------
216 Reset Handler called on controller reset
217 *----------------------------------------------------------------------------*/
218 __ASM void Reset_Handler(void) {
223 // Put any cores other than 0 to sleep
224 MRC p15, 0, R0, c0, c0, 5 // Read MPIDR
230 // Reset SCTLR Settings
231 MRC p15, 0, R0, c1, c0, 0 // Read CP15 System Control register
232 BIC R0, R0, #(0x1 << 12) // Clear I bit 12 to disable I Cache
233 BIC R0, R0, #(0x1 << 2) // Clear C bit 2 to disable D Cache
234 BIC R0, R0, #0x1 // Clear M bit 0 to disable MMU
235 BIC R0, R0, #(0x1 << 11) // Clear Z bit 11 to disable branch prediction
236 BIC R0, R0, #(0x1 << 13) // Clear V bit 13 to disable hivecs
237 MCR p15, 0, R0, c1, c0, 0 // Write value back to CP15 System Control register
241 MRC p15, 0, r0, c1, c0, 1 // Read CP15 Auxiliary Control Register
242 ORR r0, r0, #(1 << 1) // Enable L2 prefetch hint (UNK/WI since r4p1)
243 MCR p15, 0, r0, c1, c0, 1 // Write CP15 Auxiliary Control Register
245 // Set Vector Base Address Register (VBAR) to point to this application's vector table
247 MCR p15, 0, R0, c12, c0, 0
249 // Setup Stack for each exceptional mode
250 IMPORT |Image$$FIQ_STACK$$ZI$$Limit|
251 IMPORT |Image$$IRQ_STACK$$ZI$$Limit|
252 IMPORT |Image$$SVC_STACK$$ZI$$Limit|
253 IMPORT |Image$$ABT_STACK$$ZI$$Limit|
254 IMPORT |Image$$UND_STACK$$ZI$$Limit|
255 IMPORT |Image$$ARM_LIB_STACK$$ZI$$Limit|
257 LDR SP, =|Image$$FIQ_STACK$$ZI$$Limit|
259 LDR SP, =|Image$$IRQ_STACK$$ZI$$Limit|
261 LDR SP, =|Image$$SVC_STACK$$ZI$$Limit|
263 LDR SP, =|Image$$ABT_STACK$$ZI$$Limit|
265 LDR SP, =|Image$$UND_STACK$$ZI$$Limit|
267 LDR SP, =|Image$$ARM_LIB_STACK$$ZI$$Limit|
281 /*----------------------------------------------------------------------------
282 Default Handler for Exceptions / Interrupts
283 *----------------------------------------------------------------------------*/
284 void Default_Handler(void) {
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