author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 21:31:10 +0200 | |
changeset 45 | 329ab0095843 |
parent 43 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32/include/nkernsmp/arm/entry.h |
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// |
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// |
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#include <arm_gic.h> |
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#include <arm_tmr.h> |
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extern "C" { |
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extern void __ArmVectorReset(); |
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extern void __ArmVectorUndef(); |
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extern void __ArmVectorSwi(); |
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extern void __ArmVectorAbortPrefetch(); |
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extern void __ArmVectorAbortData(); |
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extern void __ArmVectorReserved(); |
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extern void __ArmVectorIrq(); |
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extern void __ArmVectorFiq(); |
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#define __DECLARE_UNDEFINED_INSTRUCTION_HANDLER asm(".word __ArmVectorUndef ") |
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#define __DECLARE_PREFETCH_ABORT_HANDLER asm(".word __ArmVectorAbortPrefetch ") |
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#define __DECLARE_DATA_ABORT_HANDLER asm(".word __ArmVectorAbortData ") |
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#ifdef BTRACE_CPU_USAGE |
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extern void btrace_irq_entry(TInt); |
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extern void btrace_fiq_entry(); |
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#endif |
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extern void handle_crash_ipi(); |
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#ifdef _DEBUG |
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extern void __DebugMsgIrq(TUint aIrqNumber); |
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#endif |
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/* NOTE: We must ensure that this code goes at the beginning of the kernel image. |
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*/ |
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__NAKED__ void __this_must_go_at_the_beginning_of_the_kernel_image() |
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{ |
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asm("ldr pc, __reset_vector "); // 00 = Reset vector |
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asm("ldr pc, __undef_vector "); // 04 = Undefined instruction vector |
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asm("ldr pc, __swi_vector "); // 08 = SWI vector |
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asm("ldr pc, __pabt_vector "); // 0C = Prefetch abort vector |
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asm("ldr pc, __dabt_vector "); // 10 = Data abort vector |
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asm("ldr pc, __unused_vector "); // 14 = unused |
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asm("b HandleIrq "); // 18 = IRQ vector |
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// 1C = FIQ vector, code in situ |
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/*** FIQ entry point ******************************************************/ |
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asm("ldr r12, __ArmInterrupt "); |
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#ifdef BTRACE_CPU_USAGE |
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asm("ldr r11, __BTraceCpuUsageFilter "); |
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#endif |
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asm("sub lr, lr, #4 "); |
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asm("ldr r10, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iFiqHandler)); // r10 points to FIQ handler |
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asm("str lr, [sp, #-4]! "); |
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// we assume FIQ handler preserves r0-r7 but not r8-r12 |
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// hence must be assembler, so stack misalignment OK |
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#if defined(__CPU_ARM_HAS_WORKING_CLREX) |
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CLREX |
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#elif defined(__CPU_ARM_HAS_LDREX_STREX) |
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STREX(8,14,13); // dummy STREX to reset exclusivity monitor |
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#endif |
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#ifdef __USER_MEMORY_GUARDS_ENABLED__ |
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USER_MEMORY_GUARD_ON(,lr,r8); |
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asm("str lr, [sp, #-4]! "); |
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#endif |
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#ifdef BTRACE_CPU_USAGE |
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asm("ldrb r8, [r11] "); |
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asm("ldr lr, _ArmVectorFiq "); |
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asm("cmp r8, #0 "); |
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asm("bne btrace_fiq"); |
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__JUMP(, r10); // jump to FIQ handler |
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asm("btrace_fiq: "); // call trace handler before fiq handler... |
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asm("stmfd sp!, {r0-r3,r12,lr} "); |
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asm("adr lr, btrace_fiq_return "); |
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asm("ldr pc, __btrace_fiq_entry "); |
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asm("btrace_fiq_return: "); |
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asm("ldmfd sp!, {r0-r3,r12,lr} "); |
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__JUMP(, r10); // jump to FIQ handler |
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#endif |
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asm("ldr lr, _ArmVectorFiq "); |
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__JUMP(,r10); // jump to FIQ handler |
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/*** Nested IRQ register save *********************************************/ |
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asm("nested_irq: "); |
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100 |
SRSDBW(MODE_SYS); // save return address and return CPSR to interrupt stack |
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101 |
CPSCHM(MODE_SYS); // mode_sys, IRQs off |
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102 |
asm("stmfd sp!, {r0-r12,lr} "); // save R0-R12,R14 from system mode |
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103 |
GET_RWNO_TID(,r4); |
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104 |
asm("b nested_irq_rejoin "); |
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|
105 |
|
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106 |
/*** IRQ entry point ******************************************************/ |
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asm("HandleIrq: "); |
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asm("mrs r13, spsr "); |
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asm("sub lr, lr, #4 "); |
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110 |
asm("and r13, r13, #0x1f "); |
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111 |
asm("cmp r13, #0x1f "); // interrupted mode_sys? |
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asm("beq nested_irq "); // yes -> nested interrupt |
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113 |
SRSDBW(MODE_SVC); // save return address and return CPSR to supervisor stack |
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__ASM_CLI_MODE(MODE_SVC); // mode_svc, IRQs and FIQs off |
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asm("sub sp, sp, #%a0" : : "i" _FOFF(SThreadExcStack,iR15)); |
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asm("stmia sp, {r0-r14}^ "); // save R0-R12, R13_usr, R14_usr |
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asm("mov r1, #%a0" : : "i" ((TInt)SThreadExcStack::EIrq)); |
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#if defined(__CPU_ARM_HAS_WORKING_CLREX) |
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CLREX |
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#elif defined(__CPU_ARM_HAS_LDREX_STREX) |
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STREX(12, 0, 13); // dummy STREX to reset exclusivity monitor |
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122 |
#endif |
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GET_RWNO_TID(,r4); |
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asm("mov r5, sp "); |
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asm("str r1, [sp, #%a0]" : : "i" _FOFF(SThreadExcStack,iExcCode)); // word describing exception type |
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__ASM_STI2_MODE(MODE_SYS); // mode_sys, IRQs off, FIQs on |
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asm("ldr sp, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_IrqStackTop)); |
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128 |
USER_MEMORY_GUARD_ON(,r8,r0); // r8 = original DACR if user memory guards in use |
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129 |
|
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asm("nested_irq_rejoin: "); |
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asm("ldr r0, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_IrqCount)); |
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asm("ldr r7, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_IrqNestCount)); |
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asm("ldr r12, __ArmInterrupt "); |
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asm("ldr r10, _ArmVectorIrq "); |
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asm("add r0, r0, #1 "); |
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136 |
asm("add r7, r7, #1 "); |
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__DATA_MEMORY_BARRIER_Z__(r2); // ensure memory accesses in interrupted code are observed before |
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138 |
// the writes to i_IrqCount, i_IrqNestCount |
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139 |
asm("str r0, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_IrqCount)); // increment i_IrqCount |
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asm("ldr r11, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iIrqHandler)); // address of IRQ handler |
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asm("ldr r6, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_GicCpuIfcAddr)); |
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asm("str r7, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_IrqNestCount)); // increment i_IrqNestCount |
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143 |
|
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asm("1: "); |
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145 |
#ifdef BTRACE_CPU_USAGE |
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asm("ldr r2, __BTraceCpuUsageFilter "); |
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#endif |
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asm("mov r1, #%a0" : : "i" ((TInt)E_GicIntId_Spurious+1)); |
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asm("ldr r0, [r6, #%a0]" : : "i" _FOFF(GicCpuIfc, iAck)); // r0 = number of interrupt to service |
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150 |
#ifdef BTRACE_CPU_USAGE |
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151 |
asm("ldrb r2, [r2] "); |
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152 |
#endif |
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153 |
asm("sub r1, r1, #1 "); |
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154 |
asm("cmp r0, r1 "); // any more interrupts pending? |
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155 |
asm("beq 2f "); // if not, branch out |
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156 |
#ifdef BTRACE_CPU_USAGE |
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157 |
asm("cmp r2, #0 "); |
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158 |
asm("beq 9f "); |
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159 |
asm("stmfd sp!, {r0-r3} "); |
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160 |
asm("adr lr, btrace_irq_return "); |
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161 |
asm("ldr pc, __btrace_irq_entry "); |
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162 |
asm("btrace_irq_return: "); |
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163 |
asm("ldmfd sp!, {r0-r3} "); |
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164 |
asm("9: "); |
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165 |
#endif // BTRACE_CPU_USAGE |
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166 |
ASM_DEBUG1(_longjump_Irq,r0); |
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167 |
asm("adr lr, 1b "); |
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168 |
asm("tst r0, #0x3e0 "); // check for interrupt numbers 0-31 |
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169 |
asm("beq 3f "); // branch out if so |
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170 |
__JUMP(,r11); // jump to dispatcher, R0 = interrupt number, return to 1: |
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171 |
// dispatcher acknowledges interrupt |
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172 |
|
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173 |
// No more interrupts pending - jump to postamble in the kernel |
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174 |
// R4->TSubScheduler at this point, R5->saved registers on SVC stack if not nested IRQ |
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175 |
// R6->GIC CPU interface |
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176 |
asm("2: "); |
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177 |
__JUMP(,r10); |
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178 |
|
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179 |
// Kernel IPI |
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180 |
asm("3: "); |
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181 |
asm("and r2, r0, #31 "); // r2 = interrupt number 0...31 |
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182 |
asm("cmp r2, #%a0" : : "i" ((TInt)TIMESLICE_VECTOR)); |
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183 |
asm("beq do_timeslice_irq "); |
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184 |
asm("cmp r2, #%a0" : : "i" ((TInt)RESCHED_IPI_VECTOR)); |
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185 |
asm("beq do_resched_ipi "); |
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186 |
asm("cmp r2, #%a0" : : "i" ((TInt)GENERIC_IPI_VECTOR)); |
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187 |
asm("beq do_generic_ipi "); |
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188 |
asm("cmp r2, #%a0" : : "i" ((TInt)TRANSFERRED_IRQ_VECTOR)); |
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189 |
asm("beq do_transferred_ipi "); |
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190 |
asm("cmp r2, #15 "); |
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191 |
__JUMP(hi, r11); // if >15 but not TIMESLICE_VECTOR, call dispatcher |
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192 |
|
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// else assume CRASH_IPI |
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asm("str r0, [r6, #%a0]" : : "i" _FOFF(GicCpuIfc, iEoi)); // acknowledge interrupt |
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__DATA_SYNC_BARRIER_Z__(r1); |
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asm("ldr r1, __HandleCrashIPI "); |
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__JUMP(, r1); // CRASH IPI, so crash |
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|
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// TIMESLICE, RESCHED or TRANSFERRED |
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asm("do_timeslice_irq: "); |
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asm("ldr r2, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, i_LocalTimerAddr)); |
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asm("mov r1, #1 "); |
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asm("str r1, [r2, #%a0]" : : "i" _FOFF(ArmLocalTimer, iTimerIntStatus)); // clear timer event flag |
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asm("do_resched_ipi: "); |
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asm("mov r1, #1 "); |
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asm("strb r1, [r4, #%a0]" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag)); |
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asm("do_transferred_ipi: "); |
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asm("str r0, [r6, #%a0]" : : "i" _FOFF(GicCpuIfc, iEoi)); // acknowledge interrupt |
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__DATA_SYNC_BARRIER_Z__(r1); // ensure writes to i_IrqCount, i_IrqNestCount, iRescheduleNeededFlag complete before SEV |
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// also ensure EOI is written before we return from the interrupt |
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ARM_SEV; // kick any CPUs waiting for us to enter the ISR |
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asm("b 1b "); |
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|
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// GENERIC_IPI |
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asm("do_generic_ipi: "); |
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asm("ldr r2, _GenericIPIIsr "); |
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asm("str r0, [r6, #%a0]" : : "i" _FOFF(GicCpuIfc, iEoi)); // acknowledge interrupt |
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asm("mov r0, r4 "); // r0->SubScheduler |
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__DATA_SYNC_BARRIER_Z__(r1); |
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__JUMP(, r2); |
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221 |
|
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asm("__DebugMsg_longjump_Irq: "); |
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asm("ldr pc, _dmIrq "); |
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|
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asm("__reset_vector:"); |
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asm(".word __ArmVectorReset "); |
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asm("__undef_vector:"); |
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__DECLARE_UNDEFINED_INSTRUCTION_HANDLER; |
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asm("__swi_vector:"); |
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asm(".word __ArmVectorSwi "); |
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asm("__pabt_vector:"); |
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__DECLARE_PREFETCH_ABORT_HANDLER; |
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asm("__dabt_vector:"); |
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__DECLARE_DATA_ABORT_HANDLER; |
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asm("__unused_vector:"); |
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asm(".word __ArmVectorReserved "); |
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|
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asm("__ArmInterrupt: "); |
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asm(".word ArmInterruptInfo "); |
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asm("_ArmVectorIrq: "); |
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asm(".word __ArmVectorIrq "); |
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asm("_GenericIPIIsr: "); |
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asm(".word generic_ipi_isr "); |
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asm("_ArmVectorFiq: "); |
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asm(".word __ArmVectorFiq "); |
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asm("__HandleCrashIPI: "); |
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asm(".word handle_crash_ipi "); |
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#ifdef BTRACE_CPU_USAGE |
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asm("__BTraceCpuUsageFilter: "); |
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asm(".word %a0" : : "i" ((TInt)&BTraceData.iFilter[BTrace::ECpuUsage])); |
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asm("__btrace_irq_entry: "); |
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asm(".word btrace_irq_entry "); |
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asm("__btrace_fiq_entry: "); |
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asm(".word btrace_fiq_entry "); |
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#endif |
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asm("_dmIrq: "); |
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asm(".word __DebugMsgIrq "); |
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} |
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} |
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260 |