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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [GCC/] [PPC440_Xilinx/] [portasm.S] - Rev 835
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/*FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.**************************************************************************** ** If you are: ** ** + New to FreeRTOS, ** + Wanting to learn FreeRTOS or multitasking in general quickly ** + Looking for basic training, ** + Wanting to improve your FreeRTOS skills and productivity ** ** then take a look at the FreeRTOS books - available as PDF or paperback ** ** "Using the FreeRTOS Real Time Kernel - a Practical Guide" ** http://www.FreeRTOS.org/Documentation ** ** A pdf reference manual is also available. Both are usually delivered ** to your inbox within 20 minutes to two hours when purchased between 8am ** and 8pm GMT (although please allow up to 24 hours in case of ** exceptional circumstances). Thank you for your support! ** ****************************************************************************This file is part of the FreeRTOS distribution.FreeRTOS is free software; you can redistribute it and/or modify it underthe terms of the GNU General Public License (version 2) as published by theFree Software Foundation AND MODIFIED BY the FreeRTOS exception.***NOTE*** The exception to the GPL is included to allow you to distributea combined work that includes FreeRTOS without being obliged to provide thesource code for proprietary components outside of the FreeRTOS kernel.FreeRTOS is distributed in the hope that it will be useful, but WITHOUTANY WARRANTY; without even the implied warranty of MERCHANTABILITY orFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License formore details. You should have received a copy of the GNU General PublicLicense and the FreeRTOS license exception along with FreeRTOS; if not itcan be viewed here: http://www.freertos.org/a00114.html and also obtainedby writing to Richard Barry, contact details for whom are available on theFreeRTOS WEB site.1 tab == 4 spaces!http://www.FreeRTOS.org - Documentation, latest information, license andcontact details.http://www.SafeRTOS.com - A version that is certified for use in safetycritical systems.http://www.OpenRTOS.com - Commercial support, development, porting,licensing and training services.*/#include "FreeRTOSConfig.h".extern pxCurrentTCB.extern vTaskSwitchContext.extern vTaskIncrementTick.extern vPortISRHandler.global vPortStartFirstTask.global vPortYield.global vPortTickISR.global vPortISRWrapper.global vPortSaveFPURegisters.global vPortRestoreFPURegisters.set BChainField, 0.set NextLRField, BChainField + 4.set MSRField, NextLRField + 4.set PCField, MSRField + 4.set LRField, PCField + 4.set CTRField, LRField + 4.set XERField, CTRField + 4.set CRField, XERField + 4.set USPRG0Field, CRField + 4.set r0Field, USPRG0Field + 4.set r2Field, r0Field + 4.set r3r31Field, r2Field + 4.set IFrameSize, r3r31Field + ( ( 31 - 3 ) + 1 ) * 4.macro portSAVE_STACK_POINTER_AND_LR/* Get the address of the TCB. */xor R0, R0, R0addis R2, R0, pxCurrentTCB@halwz R2, pxCurrentTCB@l( R2 )/* Store the stack pointer into the TCB */stw SP, 0( R2 )/* Save the link register */stwu R1, -24( R1 )mflr R0stw R31, 20( R1 )stw R0, 28( R1 )mr R31, r1.endm.macro portRESTORE_STACK_POINTER_AND_LR/* Restore the link register */lwz R11, 0( R1 )lwz R0, 4( R11 )mtlr R0lwz R31, -4( R11 )mr R1, R11/* Get the address of the TCB. */xor R0, R0, R0addis SP, R0, pxCurrentTCB@halwz SP, pxCurrentTCB@l( R1 )/* Get the task stack pointer from the TCB. */lwz SP, 0( SP ).endmvPortStartFirstTask:/* Get the address of the TCB. */xor R0, R0, R0addis SP, R0, pxCurrentTCB@halwz SP, pxCurrentTCB@l( SP )/* Get the task stack pointer from the TCB. */lwz SP, 0( SP )/* Restore MSR register to SRR1. */lwz R0, MSRField(R1)mtsrr1 R0/* Restore current PC location to SRR0. */lwz R0, PCField(R1)mtsrr0 R0/* Save USPRG0 register */lwz R0, USPRG0Field(R1)mtspr 0x100,R0/* Restore Condition register */lwz R0, CRField(R1)mtcr R0/* Restore Fixed Point Exception register */lwz R0, XERField(R1)mtxer R0/* Restore Counter register */lwz R0, CTRField(R1)mtctr R0/* Restore Link register */lwz R0, LRField(R1)mtlr R0/* Restore remaining GPR registers. */lmw R3,r3r31Field(R1)/* Restore r0 and r2. */lwz R0, r0Field(R1)lwz R2, r2Field(R1)/* Remove frame from stack */addi R1,R1,IFrameSize/* Return into the first task */rfivPortYield:portSAVE_STACK_POINTER_AND_LRbl vTaskSwitchContextportRESTORE_STACK_POINTER_AND_LRblrvPortTickISR:portSAVE_STACK_POINTER_AND_LRbl vTaskIncrementTick#if configUSE_PREEMPTION == 1bl vTaskSwitchContext#endif/* Clear the interrupt */lis R0, 2048mttsr R0portRESTORE_STACK_POINTER_AND_LRblrvPortISRWrapper:portSAVE_STACK_POINTER_AND_LRbl vPortISRHandlerportRESTORE_STACK_POINTER_AND_LRblr#if configUSE_FPU == 1vPortSaveFPURegisters:/* Enable APU and mark FPU as present. */mfmsr r0xor r30, r30, r30oris r30, r30, 512ori r30, r30, 8192or r0, r0, r30mtmsr r0#ifdef USE_DP_FPU/* Buffer address is in r3. Save each flop register into an offset fromthis buffer address. */stfd f0, 0(r3)stfd f1, 8(r3)stfd f2, 16(r3)stfd f3, 24(r3)stfd f4, 32(r3)stfd f5, 40(r3)stfd f6, 48(r3)stfd f7, 56(r3)stfd f8, 64(r3)stfd f9, 72(r3)stfd f10, 80(r3)stfd f11, 88(r3)stfd f12, 96(r3)stfd f13, 104(r3)stfd f14, 112(r3)stfd f15, 120(r3)stfd f16, 128(r3)stfd f17, 136(r3)stfd f18, 144(r3)stfd f19, 152(r3)stfd f20, 160(r3)stfd f21, 168(r3)stfd f22, 176(r3)stfd f23, 184(r3)stfd f24, 192(r3)stfd f25, 200(r3)stfd f26, 208(r3)stfd f27, 216(r3)stfd f28, 224(r3)stfd f29, 232(r3)stfd f30, 240(r3)stfd f31, 248(r3)/* Also save the FPSCR. */mffs f31stfs f31, 256(r3)#else/* Buffer address is in r3. Save each flop register into an offset fromthis buffer address. */stfs f0, 0(r3)stfs f1, 4(r3)stfs f2, 8(r3)stfs f3, 12(r3)stfs f4, 16(r3)stfs f5, 20(r3)stfs f6, 24(r3)stfs f7, 28(r3)stfs f8, 32(r3)stfs f9, 36(r3)stfs f10, 40(r3)stfs f11, 44(r3)stfs f12, 48(r3)stfs f13, 52(r3)stfs f14, 56(r3)stfs f15, 60(r3)stfs f16, 64(r3)stfs f17, 68(r3)stfs f18, 72(r3)stfs f19, 76(r3)stfs f20, 80(r3)stfs f21, 84(r3)stfs f22, 88(r3)stfs f23, 92(r3)stfs f24, 96(r3)stfs f25, 100(r3)stfs f26, 104(r3)stfs f27, 108(r3)stfs f28, 112(r3)stfs f29, 116(r3)stfs f30, 120(r3)stfs f31, 124(r3)/* Also save the FPSCR. */mffs f31stfs f31, 128(r3)#endifblr#endif /* configUSE_FPU. */#if configUSE_FPU == 1vPortRestoreFPURegisters:/* Enable APU and mark FPU as present. */mfmsr r0xor r30, r30, r30oris r30, r30, 512ori r30, r30, 8192or r0, r0, r30mtmsr r0#ifdef USE_DP_FPU/* Buffer address is in r3. Restore each flop register from an offsetinto this buffer.First the FPSCR. */lfs f31, 256(r3)mtfsf f31, 7lfd f0, 0(r3)lfd f1, 8(r3)lfd f2, 16(r3)lfd f3, 24(r3)lfd f4, 32(r3)lfd f5, 40(r3)lfd f6, 48(r3)lfd f7, 56(r3)lfd f8, 64(r3)lfd f9, 72(r3)lfd f10, 80(r3)lfd f11, 88(r3)lfd f12, 96(r3)lfd f13, 104(r3)lfd f14, 112(r3)lfd f15, 120(r3)lfd f16, 128(r3)lfd f17, 136(r3)lfd f18, 144(r3)lfd f19, 152(r3)lfd f20, 160(r3)lfd f21, 168(r3)lfd f22, 176(r3)lfd f23, 184(r3)lfd f24, 192(r3)lfd f25, 200(r3)lfd f26, 208(r3)lfd f27, 216(r3)lfd f28, 224(r3)lfd f29, 232(r3)lfd f30, 240(r3)lfd f31, 248(r3)#else/* Buffer address is in r3. Restore each flop register from an offsetinto this buffer.First the FPSCR. */lfs f31, 128(r3)mtfsf f31, 7lfs f0, 0(r3)lfs f1, 4(r3)lfs f2, 8(r3)lfs f3, 12(r3)lfs f4, 16(r3)lfs f5, 20(r3)lfs f6, 24(r3)lfs f7, 28(r3)lfs f8, 32(r3)lfs f9, 36(r3)lfs f10, 40(r3)lfs f11, 44(r3)lfs f12, 48(r3)lfs f13, 52(r3)lfs f14, 56(r3)lfs f15, 60(r3)lfs f16, 64(r3)lfs f17, 68(r3)lfs f18, 72(r3)lfs f19, 76(r3)lfs f20, 80(r3)lfs f21, 84(r3)lfs f22, 88(r3)lfs f23, 92(r3)lfs f24, 96(r3)lfs f25, 100(r3)lfs f26, 104(r3)lfs f27, 108(r3)lfs f28, 112(r3)lfs f29, 116(r3)lfs f30, 120(r3)lfs f31, 124(r3)#endifblr#endif /* configUSE_FPU. */
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