Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbed-rtos/rtx/TARGET_CORTEX_A/TOOLCHAIN_ARM/HAL_CA9.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 2 * RL-ARM - RTX
mbedAustin 11:cada08fc8a70 3 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 4 * Name: HAL_CA9.c
mbedAustin 11:cada08fc8a70 5 * Purpose: Hardware Abstraction Layer for Cortex-A9
mbedAustin 11:cada08fc8a70 6 * Rev.: 8 April 2015
mbedAustin 11:cada08fc8a70 7 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 8 *
mbedAustin 11:cada08fc8a70 9 * Copyright (c) 2012 - 2015 ARM Limited
mbedAustin 11:cada08fc8a70 10 * All rights reserved.
mbedAustin 11:cada08fc8a70 11 * Redistribution and use in source and binary forms, with or without
mbedAustin 11:cada08fc8a70 12 * modification, are permitted provided that the following conditions are met:
mbedAustin 11:cada08fc8a70 13 * - Redistributions of source code must retain the above copyright
mbedAustin 11:cada08fc8a70 14 * notice, this list of conditions and the following disclaimer.
mbedAustin 11:cada08fc8a70 15 * - Redistributions in binary form must reproduce the above copyright
mbedAustin 11:cada08fc8a70 16 * notice, this list of conditions and the following disclaimer in the
mbedAustin 11:cada08fc8a70 17 * documentation and/or other materials provided with the distribution.
mbedAustin 11:cada08fc8a70 18 * - Neither the name of ARM nor the names of its contributors may be used
mbedAustin 11:cada08fc8a70 19 * to endorse or promote products derived from this software without
mbedAustin 11:cada08fc8a70 20 * specific prior written permission.
mbedAustin 11:cada08fc8a70 21 *
mbedAustin 11:cada08fc8a70 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbedAustin 11:cada08fc8a70 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbedAustin 11:cada08fc8a70 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbedAustin 11:cada08fc8a70 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
mbedAustin 11:cada08fc8a70 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
mbedAustin 11:cada08fc8a70 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
mbedAustin 11:cada08fc8a70 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbedAustin 11:cada08fc8a70 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbedAustin 11:cada08fc8a70 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
mbedAustin 11:cada08fc8a70 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbedAustin 11:cada08fc8a70 32 * POSSIBILITY OF SUCH DAMAGE.
mbedAustin 11:cada08fc8a70 33 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 34
mbedAustin 11:cada08fc8a70 35 #include "rt_TypeDef.h"
mbedAustin 11:cada08fc8a70 36 #include "RTX_Config.h"
mbedAustin 11:cada08fc8a70 37 #include "rt_System.h"
mbedAustin 11:cada08fc8a70 38 #include "rt_Task.h"
mbedAustin 11:cada08fc8a70 39 #include "rt_List.h"
mbedAustin 11:cada08fc8a70 40 #include "rt_MemBox.h"
mbedAustin 11:cada08fc8a70 41 #include "rt_HAL_CA.h"
mbedAustin 11:cada08fc8a70 42
mbedAustin 11:cada08fc8a70 43
mbedAustin 11:cada08fc8a70 44 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 45 * Functions
mbedAustin 11:cada08fc8a70 46 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 47
mbedAustin 11:cada08fc8a70 48 //For A-class, set USR/SYS stack
mbedAustin 11:cada08fc8a70 49 __asm void rt_set_PSP (U32 stack) {
mbedAustin 11:cada08fc8a70 50 ARM
mbedAustin 11:cada08fc8a70 51
mbedAustin 11:cada08fc8a70 52 MRS R1, CPSR
mbedAustin 11:cada08fc8a70 53 CPS #MODE_SYS ;no effect in USR mode
mbedAustin 11:cada08fc8a70 54 ISB
mbedAustin 11:cada08fc8a70 55 MOV SP, R0
mbedAustin 11:cada08fc8a70 56 MSR CPSR_c, R1 ;no effect in USR mode
mbedAustin 11:cada08fc8a70 57 ISB
mbedAustin 11:cada08fc8a70 58 BX LR
mbedAustin 11:cada08fc8a70 59
mbedAustin 11:cada08fc8a70 60 }
mbedAustin 11:cada08fc8a70 61
mbedAustin 11:cada08fc8a70 62 //For A-class, get USR/SYS stack
mbedAustin 11:cada08fc8a70 63 __asm U32 rt_get_PSP (void) {
mbedAustin 11:cada08fc8a70 64 ARM
mbedAustin 11:cada08fc8a70 65
mbedAustin 11:cada08fc8a70 66 MRS R1, CPSR
mbedAustin 11:cada08fc8a70 67 CPS #MODE_SYS ;no effect in USR mode
mbedAustin 11:cada08fc8a70 68 ISB
mbedAustin 11:cada08fc8a70 69 MOV R0, SP
mbedAustin 11:cada08fc8a70 70 MSR CPSR_c, R1 ;no effect in USR mode
mbedAustin 11:cada08fc8a70 71 ISB
mbedAustin 11:cada08fc8a70 72 BX LR
mbedAustin 11:cada08fc8a70 73 }
mbedAustin 11:cada08fc8a70 74
mbedAustin 11:cada08fc8a70 75 /*--------------------------- _alloc_box ------------------------------------*/
mbedAustin 11:cada08fc8a70 76 __asm void *_alloc_box (void *box_mem) {
mbedAustin 11:cada08fc8a70 77 /* Function wrapper for Unprivileged/Privileged mode. */
mbedAustin 11:cada08fc8a70 78 ARM
mbedAustin 11:cada08fc8a70 79
mbedAustin 11:cada08fc8a70 80 LDR R12,=__cpp(rt_alloc_box)
mbedAustin 11:cada08fc8a70 81 MRS R2, CPSR
mbedAustin 11:cada08fc8a70 82 LSLS R2, #28
mbedAustin 11:cada08fc8a70 83 BXNE R12
mbedAustin 11:cada08fc8a70 84 SVC 0
mbedAustin 11:cada08fc8a70 85 BX LR
mbedAustin 11:cada08fc8a70 86 }
mbedAustin 11:cada08fc8a70 87
mbedAustin 11:cada08fc8a70 88
mbedAustin 11:cada08fc8a70 89 /*--------------------------- _free_box -------------------------------------*/
mbedAustin 11:cada08fc8a70 90 __asm int _free_box (void *box_mem, void *box) {
mbedAustin 11:cada08fc8a70 91 /* Function wrapper for Unprivileged/Privileged mode. */
mbedAustin 11:cada08fc8a70 92 ARM
mbedAustin 11:cada08fc8a70 93
mbedAustin 11:cada08fc8a70 94 LDR R12,=__cpp(rt_free_box)
mbedAustin 11:cada08fc8a70 95 MRS R2, CPSR
mbedAustin 11:cada08fc8a70 96 LSLS R2, #28
mbedAustin 11:cada08fc8a70 97 BXNE R12
mbedAustin 11:cada08fc8a70 98 SVC 0
mbedAustin 11:cada08fc8a70 99 BX LR
mbedAustin 11:cada08fc8a70 100
mbedAustin 11:cada08fc8a70 101 }
mbedAustin 11:cada08fc8a70 102
mbedAustin 11:cada08fc8a70 103 /*-------------------------- SVC_Handler -----------------------------------*/
mbedAustin 11:cada08fc8a70 104
mbedAustin 11:cada08fc8a70 105 #pragma push
mbedAustin 11:cada08fc8a70 106 #pragma arm
mbedAustin 11:cada08fc8a70 107 __asm void SVC_Handler (void) {
mbedAustin 11:cada08fc8a70 108 PRESERVE8
mbedAustin 11:cada08fc8a70 109 ARM
mbedAustin 11:cada08fc8a70 110
mbedAustin 11:cada08fc8a70 111 IMPORT rt_tsk_lock
mbedAustin 11:cada08fc8a70 112 IMPORT rt_tsk_unlock
mbedAustin 11:cada08fc8a70 113 IMPORT SVC_Count
mbedAustin 11:cada08fc8a70 114 IMPORT SVC_Table
mbedAustin 11:cada08fc8a70 115 IMPORT rt_stk_check
mbedAustin 11:cada08fc8a70 116 IMPORT FPUEnable
mbedAustin 11:cada08fc8a70 117 IMPORT scheduler_suspended ; flag set by rt_suspend, cleared by rt_resume, read by SVC_Handler
mbedAustin 11:cada08fc8a70 118
mbedAustin 11:cada08fc8a70 119 Mode_SVC EQU 0x13
mbedAustin 11:cada08fc8a70 120
mbedAustin 11:cada08fc8a70 121 SRSFD SP!, #Mode_SVC ; Push LR_SVC and SPRS_SVC onto SVC mode stack
mbedAustin 11:cada08fc8a70 122 PUSH {R4} ; Push R4 so we can use it as a temp
mbedAustin 11:cada08fc8a70 123
mbedAustin 11:cada08fc8a70 124 MRS R4,SPSR ; Get SPSR
mbedAustin 11:cada08fc8a70 125 TST R4,#CPSR_T_BIT ; Check Thumb Bit
mbedAustin 11:cada08fc8a70 126 LDRNEH R4,[LR,#-2] ; Thumb: Load Halfword
mbedAustin 11:cada08fc8a70 127 BICNE R4,R4,#0xFF00 ; Extract SVC Number
mbedAustin 11:cada08fc8a70 128 LDREQ R4,[LR,#-4] ; ARM: Load Word
mbedAustin 11:cada08fc8a70 129 BICEQ R4,R4,#0xFF000000 ; Extract SVC Number
mbedAustin 11:cada08fc8a70 130
mbedAustin 11:cada08fc8a70 131 /* Lock out systick and re-enable interrupts */
mbedAustin 11:cada08fc8a70 132 PUSH {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 133
mbedAustin 11:cada08fc8a70 134 AND R12, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 135 SUB SP, SP, R12 ; Adjust stack
mbedAustin 11:cada08fc8a70 136 PUSH {R12, LR} ; Store stack adjustment and dummy LR to SVC stack
mbedAustin 11:cada08fc8a70 137
mbedAustin 11:cada08fc8a70 138 BLX rt_tsk_lock
mbedAustin 11:cada08fc8a70 139 CPSIE i
mbedAustin 11:cada08fc8a70 140
mbedAustin 11:cada08fc8a70 141 POP {R12, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 142 ADD SP, SP, R12 ; Unadjust stack
mbedAustin 11:cada08fc8a70 143
mbedAustin 11:cada08fc8a70 144 POP {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 145
mbedAustin 11:cada08fc8a70 146 CMP R4,#0
mbedAustin 11:cada08fc8a70 147 BNE SVC_User
mbedAustin 11:cada08fc8a70 148
mbedAustin 11:cada08fc8a70 149 MRS R4,SPSR
mbedAustin 11:cada08fc8a70 150 PUSH {R4} ; Push R4 so we can use it as a temp
mbedAustin 11:cada08fc8a70 151 AND R4, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 152 SUB SP, SP, R4 ; Adjust stack
mbedAustin 11:cada08fc8a70 153 PUSH {R4, LR} ; Store stack adjustment and dummy LR
mbedAustin 11:cada08fc8a70 154 BLX R12
mbedAustin 11:cada08fc8a70 155 POP {R4, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 156 ADD SP, SP, R4 ; Unadjust stack
mbedAustin 11:cada08fc8a70 157 POP {R4} ; Restore R4
mbedAustin 11:cada08fc8a70 158 MSR SPSR_CXSF,R4
mbedAustin 11:cada08fc8a70 159
mbedAustin 11:cada08fc8a70 160 /* Here we will be in SVC mode (even if coming in from PendSV_Handler or OS_Tick_Handler) */
mbedAustin 11:cada08fc8a70 161 Sys_Switch
mbedAustin 11:cada08fc8a70 162 LDR LR,=__cpp(&os_tsk)
mbedAustin 11:cada08fc8a70 163 LDM LR,{R4,LR} ; os_tsk.run, os_tsk.new_tsk
mbedAustin 11:cada08fc8a70 164 CMP R4,LR
mbedAustin 11:cada08fc8a70 165 BNE switching
mbedAustin 11:cada08fc8a70 166
mbedAustin 11:cada08fc8a70 167 PUSH {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 168
mbedAustin 11:cada08fc8a70 169 AND R12, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 170 SUB SP, SP, R12 ; Adjust stack
mbedAustin 11:cada08fc8a70 171 PUSH {R12, LR} ; Store stack adjustment and dummy LR to SVC stack
mbedAustin 11:cada08fc8a70 172
mbedAustin 11:cada08fc8a70 173 CPSID i
mbedAustin 11:cada08fc8a70 174 ; Do not unlock scheduler if it has just been suspended by rt_suspend()
mbedAustin 11:cada08fc8a70 175 LDR R1,=scheduler_suspended
mbedAustin 11:cada08fc8a70 176 LDRB R0, [R1]
mbedAustin 11:cada08fc8a70 177 CMP R0, #1
mbedAustin 11:cada08fc8a70 178 BEQ dont_unlock
mbedAustin 11:cada08fc8a70 179 BLX rt_tsk_unlock
mbedAustin 11:cada08fc8a70 180 dont_unlock
mbedAustin 11:cada08fc8a70 181
mbedAustin 11:cada08fc8a70 182 POP {R12, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 183 ADD SP, SP, R12 ; Unadjust stack
mbedAustin 11:cada08fc8a70 184
mbedAustin 11:cada08fc8a70 185 POP {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 186 POP {R4}
mbedAustin 11:cada08fc8a70 187 RFEFD SP! ; Return from exception, no task switch
mbedAustin 11:cada08fc8a70 188
mbedAustin 11:cada08fc8a70 189 switching
mbedAustin 11:cada08fc8a70 190 CLREX
mbedAustin 11:cada08fc8a70 191 CMP R4,#0
mbedAustin 11:cada08fc8a70 192 ADDEQ SP,SP,#12 ; Original R4, LR & SPSR do not need to be popped when we are paging in a different task
mbedAustin 11:cada08fc8a70 193 BEQ SVC_Next ; Runtask deleted?
mbedAustin 11:cada08fc8a70 194
mbedAustin 11:cada08fc8a70 195
mbedAustin 11:cada08fc8a70 196 PUSH {R8-R11} //R4 and LR already stacked
mbedAustin 11:cada08fc8a70 197 MOV R10,R4 ; Preserve os_tsk.run
mbedAustin 11:cada08fc8a70 198 MOV R11,LR ; Preserve os_tsk.new_tsk
mbedAustin 11:cada08fc8a70 199
mbedAustin 11:cada08fc8a70 200 ADD R8,SP,#16 ; Unstack R4,LR
mbedAustin 11:cada08fc8a70 201 LDMIA R8,{R4,LR}
mbedAustin 11:cada08fc8a70 202
mbedAustin 11:cada08fc8a70 203 SUB SP,SP,#4 ; Make space on the stack for the next instn
mbedAustin 11:cada08fc8a70 204 STMIA SP,{SP}^ ; Put User SP onto stack
mbedAustin 11:cada08fc8a70 205 POP {R8} ; Pop User SP into R8
mbedAustin 11:cada08fc8a70 206
mbedAustin 11:cada08fc8a70 207 MRS R9,SPSR
mbedAustin 11:cada08fc8a70 208 STMDB R8!,{R9} ; User CPSR
mbedAustin 11:cada08fc8a70 209 STMDB R8!,{LR} ; User PC
mbedAustin 11:cada08fc8a70 210 STMDB R8,{LR}^ ; User LR
mbedAustin 11:cada08fc8a70 211 SUB R8,R8,#4 ; No writeback for store of User LR
mbedAustin 11:cada08fc8a70 212 STMDB R8!,{R0-R3,R12} ; User R0-R3,R12
mbedAustin 11:cada08fc8a70 213 MOV R3,R10 ; os_tsk.run
mbedAustin 11:cada08fc8a70 214 MOV LR,R11 ; os_tsk.new_tsk
mbedAustin 11:cada08fc8a70 215 POP {R9-R12}
mbedAustin 11:cada08fc8a70 216 ADD SP,SP,#12 ; Fix up SP for unstack of R4, LR & SPSR
mbedAustin 11:cada08fc8a70 217 STMDB R8!,{R4-R7,R9-R12} ; User R4-R11
mbedAustin 11:cada08fc8a70 218
mbedAustin 11:cada08fc8a70 219 //If applicable, stack VFP/NEON state
mbedAustin 11:cada08fc8a70 220 MRC p15,0,R1,c1,c0,2 ; VFP/NEON access enabled? (CPACR)
mbedAustin 11:cada08fc8a70 221 AND R2,R1,#0x00F00000
mbedAustin 11:cada08fc8a70 222 CMP R2,#0x00F00000
mbedAustin 11:cada08fc8a70 223 BNE no_outgoing_vfp
mbedAustin 11:cada08fc8a70 224 VMRS R2,FPSCR
mbedAustin 11:cada08fc8a70 225 STMDB R8!,{R2,R4} ; Push FPSCR, maintain 8-byte alignment
mbedAustin 11:cada08fc8a70 226 VSTMDB R8!,{D0-D15}
mbedAustin 11:cada08fc8a70 227 VSTMDB R8!,{D16-D31}
mbedAustin 11:cada08fc8a70 228 LDRB R2,[R3,#TCB_STACKF] ; Record in TCB that NEON/D32 state is stacked
mbedAustin 11:cada08fc8a70 229 ORR R2,#4
mbedAustin 11:cada08fc8a70 230 STRB R2,[R3,#TCB_STACKF]
mbedAustin 11:cada08fc8a70 231
mbedAustin 11:cada08fc8a70 232 no_outgoing_vfp
mbedAustin 11:cada08fc8a70 233 STR R8,[R3,#TCB_TSTACK]
mbedAustin 11:cada08fc8a70 234 MOV R4,LR
mbedAustin 11:cada08fc8a70 235
mbedAustin 11:cada08fc8a70 236 PUSH {R4} ; Push R4 so we can use it as a temp
mbedAustin 11:cada08fc8a70 237 AND R4, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 238 SUB SP, SP, R4 ; Adjust stack
mbedAustin 11:cada08fc8a70 239 PUSH {R4, LR} ; Store stack adjustment and dummy LR to SVC stack
mbedAustin 11:cada08fc8a70 240
mbedAustin 11:cada08fc8a70 241 BLX rt_stk_check
mbedAustin 11:cada08fc8a70 242
mbedAustin 11:cada08fc8a70 243 POP {R4, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 244 ADD SP, SP, R4 ; Unadjust stack
mbedAustin 11:cada08fc8a70 245 POP {R4} ; Restore R4
mbedAustin 11:cada08fc8a70 246
mbedAustin 11:cada08fc8a70 247 MOV LR,R4
mbedAustin 11:cada08fc8a70 248
mbedAustin 11:cada08fc8a70 249 SVC_Next //R4 == os_tsk.run, LR == os_tsk.new_tsk, R0-R3, R5-R12 corruptible
mbedAustin 11:cada08fc8a70 250 LDR R1,=__cpp(&os_tsk) ; os_tsk.run = os_tsk.new_tsk
mbedAustin 11:cada08fc8a70 251 STR LR,[R1]
mbedAustin 11:cada08fc8a70 252 LDRB R1,[LR,#TCB_TID] ; os_tsk.run->task_id
mbedAustin 11:cada08fc8a70 253 LSL R1,#8 ; Store PROCID
mbedAustin 11:cada08fc8a70 254 MCR p15,0,R1,c13,c0,1 ; Write CONTEXTIDR
mbedAustin 11:cada08fc8a70 255
mbedAustin 11:cada08fc8a70 256 LDR R0,[LR,#TCB_TSTACK] ; os_tsk.run->tsk_stack
mbedAustin 11:cada08fc8a70 257
mbedAustin 11:cada08fc8a70 258 //Does incoming task have VFP/NEON state in stack?
mbedAustin 11:cada08fc8a70 259 LDRB R3,[LR,#TCB_STACKF]
mbedAustin 11:cada08fc8a70 260 ANDS R3, R3, #0x6
mbedAustin 11:cada08fc8a70 261 MRC p15,0,R1,c1,c0,2 ; Read CPACR
mbedAustin 11:cada08fc8a70 262 ANDEQ R1,R1,#0xFF0FFFFF ; Disable VFP/NEON access if incoming task does not have stacked VFP/NEON state
mbedAustin 11:cada08fc8a70 263 ORRNE R1,R1,#0x00F00000 ; Enable VFP/NEON access if incoming task does have stacked VFP/NEON state
mbedAustin 11:cada08fc8a70 264 MCR p15,0,R1,c1,c0,2 ; Write CPACR
mbedAustin 11:cada08fc8a70 265 BEQ no_incoming_vfp
mbedAustin 11:cada08fc8a70 266 ISB ; We only need the sync if we enabled, otherwise we will context switch before next VFP/NEON instruction anyway
mbedAustin 11:cada08fc8a70 267 VLDMIA R0!,{D16-D31}
mbedAustin 11:cada08fc8a70 268 VLDMIA R0!,{D0-D15}
mbedAustin 11:cada08fc8a70 269 LDR R2,[R0]
mbedAustin 11:cada08fc8a70 270 VMSR FPSCR,R2
mbedAustin 11:cada08fc8a70 271 ADD R0,R0,#8
mbedAustin 11:cada08fc8a70 272
mbedAustin 11:cada08fc8a70 273 no_incoming_vfp
mbedAustin 11:cada08fc8a70 274 LDR R1,[R0,#60] ; Restore User CPSR
mbedAustin 11:cada08fc8a70 275 MSR SPSR_CXSF,R1
mbedAustin 11:cada08fc8a70 276 LDMIA R0!,{R4-R11} ; Restore User R4-R11
mbedAustin 11:cada08fc8a70 277 ADD R0,R0,#4 ; Restore User R1-R3,R12
mbedAustin 11:cada08fc8a70 278 LDMIA R0!,{R1-R3,R12}
mbedAustin 11:cada08fc8a70 279 LDMIA R0,{LR}^ ; Restore User LR
mbedAustin 11:cada08fc8a70 280 ADD R0,R0,#4 ; No writeback for load to user LR
mbedAustin 11:cada08fc8a70 281 LDMIA R0!,{LR} ; Restore User PC
mbedAustin 11:cada08fc8a70 282 ADD R0,R0,#4 ; Correct User SP for unstacked user CPSR
mbedAustin 11:cada08fc8a70 283
mbedAustin 11:cada08fc8a70 284 PUSH {R0} ; Push R0 onto stack
mbedAustin 11:cada08fc8a70 285 LDMIA SP,{SP}^ ; Get R0 off stack into User SP
mbedAustin 11:cada08fc8a70 286 ADD SP,SP,#4 ; Put SP back
mbedAustin 11:cada08fc8a70 287
mbedAustin 11:cada08fc8a70 288 LDR R0,[R0,#-32] ; Restore R0
mbedAustin 11:cada08fc8a70 289
mbedAustin 11:cada08fc8a70 290 PUSH {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 291
mbedAustin 11:cada08fc8a70 292 AND R12, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 293 SUB SP, SP, R12 ; Adjust stack
mbedAustin 11:cada08fc8a70 294 PUSH {R12, LR} ; Store stack adjustment and dummy LR to SVC stack
mbedAustin 11:cada08fc8a70 295
mbedAustin 11:cada08fc8a70 296 CPSID i
mbedAustin 11:cada08fc8a70 297 BLX rt_tsk_unlock
mbedAustin 11:cada08fc8a70 298
mbedAustin 11:cada08fc8a70 299 POP {R12, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 300 ADD SP, SP, R12 ; Unadjust stack
mbedAustin 11:cada08fc8a70 301
mbedAustin 11:cada08fc8a70 302 POP {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 303
mbedAustin 11:cada08fc8a70 304 MOVS PC,LR ; Return from exception
mbedAustin 11:cada08fc8a70 305
mbedAustin 11:cada08fc8a70 306
mbedAustin 11:cada08fc8a70 307 /*------------------- User SVC -------------------------------*/
mbedAustin 11:cada08fc8a70 308
mbedAustin 11:cada08fc8a70 309 SVC_User
mbedAustin 11:cada08fc8a70 310 LDR R12,=SVC_Count
mbedAustin 11:cada08fc8a70 311 LDR R12,[R12]
mbedAustin 11:cada08fc8a70 312 CMP R4,R12 ; Check for overflow
mbedAustin 11:cada08fc8a70 313 BHI SVC_Done
mbedAustin 11:cada08fc8a70 314
mbedAustin 11:cada08fc8a70 315 LDR R12,=SVC_Table-4
mbedAustin 11:cada08fc8a70 316 LDR R12,[R12,R4,LSL #2] ; Load SVC Function Address
mbedAustin 11:cada08fc8a70 317 MRS R4,SPSR ; Save SPSR
mbedAustin 11:cada08fc8a70 318 PUSH {R4} ; Push R4 so we can use it as a temp
mbedAustin 11:cada08fc8a70 319 AND R4, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 320 SUB SP, SP, R4 ; Adjust stack
mbedAustin 11:cada08fc8a70 321 PUSH {R4, LR} ; Store stack adjustment and dummy LR
mbedAustin 11:cada08fc8a70 322 BLX R12 ; Call SVC Function
mbedAustin 11:cada08fc8a70 323 POP {R4, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 324 ADD SP, SP, R4 ; Unadjust stack
mbedAustin 11:cada08fc8a70 325 POP {R4} ; Restore R4
mbedAustin 11:cada08fc8a70 326 MSR SPSR_CXSF,R4 ; Restore SPSR
mbedAustin 11:cada08fc8a70 327
mbedAustin 11:cada08fc8a70 328 SVC_Done
mbedAustin 11:cada08fc8a70 329 PUSH {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 330
mbedAustin 11:cada08fc8a70 331 PUSH {R4} ; Push R4 so we can use it as a temp
mbedAustin 11:cada08fc8a70 332 AND R4, SP, #4 ; Ensure stack is 8-byte aligned
mbedAustin 11:cada08fc8a70 333 SUB SP, SP, R4 ; Adjust stack
mbedAustin 11:cada08fc8a70 334 PUSH {R4, LR} ; Store stack adjustment and dummy LR
mbedAustin 11:cada08fc8a70 335
mbedAustin 11:cada08fc8a70 336 CPSID i
mbedAustin 11:cada08fc8a70 337 BLX rt_tsk_unlock
mbedAustin 11:cada08fc8a70 338
mbedAustin 11:cada08fc8a70 339 POP {R4, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 340 ADD SP, SP, R4 ; Unadjust stack
mbedAustin 11:cada08fc8a70 341 POP {R4} ; Restore R4
mbedAustin 11:cada08fc8a70 342
mbedAustin 11:cada08fc8a70 343 POP {R0-R3,R12,LR}
mbedAustin 11:cada08fc8a70 344 POP {R4}
mbedAustin 11:cada08fc8a70 345 RFEFD SP! ; Return from exception
mbedAustin 11:cada08fc8a70 346 }
mbedAustin 11:cada08fc8a70 347 #pragma pop
mbedAustin 11:cada08fc8a70 348
mbedAustin 11:cada08fc8a70 349 #pragma push
mbedAustin 11:cada08fc8a70 350 #pragma arm
mbedAustin 11:cada08fc8a70 351 __asm void PendSV_Handler (U32 IRQn) {
mbedAustin 11:cada08fc8a70 352 ARM
mbedAustin 11:cada08fc8a70 353
mbedAustin 11:cada08fc8a70 354 IMPORT rt_tsk_lock
mbedAustin 11:cada08fc8a70 355 IMPORT IRQNestLevel ; Flag indicates whether inside an ISR, and the depth of nesting. 0 = not in ISR.
mbedAustin 11:cada08fc8a70 356 IMPORT seen_id0_active ; Flag used to workaround GIC 390 errata 733075 - set in startup_Renesas_RZ_A1.s
mbedAustin 11:cada08fc8a70 357
mbedAustin 11:cada08fc8a70 358 ADD SP,SP,#8 //fix up stack pointer (R0 has been pushed and will never be popped, R1 was pushed for stack alignment)
mbedAustin 11:cada08fc8a70 359
mbedAustin 11:cada08fc8a70 360 //Disable systick interrupts, then write EOIR. We want interrupts disabled before we enter the context switcher.
mbedAustin 11:cada08fc8a70 361 PUSH {R0, R1}
mbedAustin 11:cada08fc8a70 362 BLX rt_tsk_lock
mbedAustin 11:cada08fc8a70 363 POP {R0, R1}
mbedAustin 11:cada08fc8a70 364 LDR R1, =__cpp(&GICInterface_BASE)
mbedAustin 11:cada08fc8a70 365 LDR R1, [R1, #0]
mbedAustin 11:cada08fc8a70 366 STR R0, [R1, #0x10]
mbedAustin 11:cada08fc8a70 367
mbedAustin 11:cada08fc8a70 368 ; If it was interrupt ID0, clear the seen flag, otherwise return as normal
mbedAustin 11:cada08fc8a70 369 CMP R0, #0
mbedAustin 11:cada08fc8a70 370 LDREQ R1, =seen_id0_active
mbedAustin 11:cada08fc8a70 371 STRBEQ R0, [R1] ; Clear the seen flag, using R0 (which is 0), to save loading another register
mbedAustin 11:cada08fc8a70 372
mbedAustin 11:cada08fc8a70 373 LDR R0, =IRQNestLevel ; Get address of nesting counter
mbedAustin 11:cada08fc8a70 374 LDR R1, [R0]
mbedAustin 11:cada08fc8a70 375 SUB R1, R1, #1 ; Decrement nesting counter
mbedAustin 11:cada08fc8a70 376 STR R1, [R0]
mbedAustin 11:cada08fc8a70 377
mbedAustin 11:cada08fc8a70 378 BLX __cpp(rt_pop_req)
mbedAustin 11:cada08fc8a70 379
mbedAustin 11:cada08fc8a70 380 POP {R1, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 381 ADD SP, SP, R1 ; Unadjust stack
mbedAustin 11:cada08fc8a70 382
mbedAustin 11:cada08fc8a70 383 LDR R0,[SP,#24]
mbedAustin 11:cada08fc8a70 384 MSR SPSR_CXSF,R0
mbedAustin 11:cada08fc8a70 385 POP {R0-R3,R12} ; Leave SPSR & LR on the stack
mbedAustin 11:cada08fc8a70 386 PUSH {R4}
mbedAustin 11:cada08fc8a70 387 B Sys_Switch
mbedAustin 11:cada08fc8a70 388 }
mbedAustin 11:cada08fc8a70 389 #pragma pop
mbedAustin 11:cada08fc8a70 390
mbedAustin 11:cada08fc8a70 391
mbedAustin 11:cada08fc8a70 392 #pragma push
mbedAustin 11:cada08fc8a70 393 #pragma arm
mbedAustin 11:cada08fc8a70 394 __asm void OS_Tick_Handler (U32 IRQn) {
mbedAustin 11:cada08fc8a70 395 ARM
mbedAustin 11:cada08fc8a70 396
mbedAustin 11:cada08fc8a70 397 IMPORT rt_tsk_lock
mbedAustin 11:cada08fc8a70 398 IMPORT IRQNestLevel ; Flag indicates whether inside an ISR, and the depth of nesting. 0 = not in ISR.
mbedAustin 11:cada08fc8a70 399 IMPORT seen_id0_active ; Flag used to workaround GIC 390 errata 733075 - set in startup_Renesas_RZ_A1.s
mbedAustin 11:cada08fc8a70 400
mbedAustin 11:cada08fc8a70 401 ADD SP,SP,#8 //fix up stack pointer (R0 has been pushed and will never be popped, R1 was pushed for stack alignment)
mbedAustin 11:cada08fc8a70 402
mbedAustin 11:cada08fc8a70 403 PUSH {R0, R1}
mbedAustin 11:cada08fc8a70 404 BLX rt_tsk_lock
mbedAustin 11:cada08fc8a70 405 POP {R0, R1}
mbedAustin 11:cada08fc8a70 406 LDR R1, =__cpp(&GICInterface_BASE)
mbedAustin 11:cada08fc8a70 407 LDR R1, [R1, #0]
mbedAustin 11:cada08fc8a70 408 STR R0, [R1, #0x10]
mbedAustin 11:cada08fc8a70 409
mbedAustin 11:cada08fc8a70 410 ; If it was interrupt ID0, clear the seen flag, otherwise return as normal
mbedAustin 11:cada08fc8a70 411 CMP R0, #0
mbedAustin 11:cada08fc8a70 412 LDREQ R1, =seen_id0_active
mbedAustin 11:cada08fc8a70 413 STRBEQ R0, [R1] ; Clear the seen flag, using R0 (which is 0), to save loading another register
mbedAustin 11:cada08fc8a70 414
mbedAustin 11:cada08fc8a70 415 LDR R0, =IRQNestLevel ; Get address of nesting counter
mbedAustin 11:cada08fc8a70 416 LDR R1, [R0]
mbedAustin 11:cada08fc8a70 417 SUB R1, R1, #1 ; Decrement nesting counter
mbedAustin 11:cada08fc8a70 418 STR R1, [R0]
mbedAustin 11:cada08fc8a70 419
mbedAustin 11:cada08fc8a70 420 BLX __cpp(os_tick_irqack)
mbedAustin 11:cada08fc8a70 421 BLX __cpp(rt_systick)
mbedAustin 11:cada08fc8a70 422
mbedAustin 11:cada08fc8a70 423 POP {R1, LR} ; Get stack adjustment & discard dummy LR
mbedAustin 11:cada08fc8a70 424 ADD SP, SP, R1 ; Unadjust stack
mbedAustin 11:cada08fc8a70 425
mbedAustin 11:cada08fc8a70 426 LDR R0,[SP,#24]
mbedAustin 11:cada08fc8a70 427 MSR SPSR_CXSF,R0
mbedAustin 11:cada08fc8a70 428 POP {R0-R3,R12} ; Leave SPSR & LR on the stack
mbedAustin 11:cada08fc8a70 429 PUSH {R4}
mbedAustin 11:cada08fc8a70 430 B Sys_Switch
mbedAustin 11:cada08fc8a70 431 }
mbedAustin 11:cada08fc8a70 432 #pragma pop
mbedAustin 11:cada08fc8a70 433
mbedAustin 11:cada08fc8a70 434
mbedAustin 11:cada08fc8a70 435 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 436 * end of file
mbedAustin 11:cada08fc8a70 437 *---------------------------------------------------------------------------*/