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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [RX600/] [port_asm.s] - Rev 624
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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 under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation AND MODIFIED BY the FreeRTOS exception. ***NOTE*** The exception to the GPL is included to allow you to distribute a combined work that includes FreeRTOS without being obliged to provide the source code for proprietary components outside of the FreeRTOS kernel. FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License and the FreeRTOS license exception along with FreeRTOS; if not it can be viewed here: http://www.freertos.org/a00114.html and also obtained by writing to Richard Barry, contact details for whom are available on the FreeRTOS WEB site. 1 tab == 4 spaces! http://www.FreeRTOS.org - Documentation, latest information, license and contact details. http://www.SafeRTOS.com - A version that is certified for use in safety critical systems. http://www.OpenRTOS.com - Commercial support, development, porting, licensing and training services. */ #include "PriorityDefinitions.h" PUBLIC _prvStartFirstTask PUBLIC ___interrupt_27 EXTERN _pxCurrentTCB EXTERN _vTaskSwitchContext RSEG CODE:CODE(4) _prvStartFirstTask: /* When starting the scheduler there is nothing that needs moving to the interrupt stack because the function is not called from an interrupt. Just ensure the current stack is the user stack. */ SETPSW U /* Obtain the location of the stack associated with which ever task pxCurrentTCB is currently pointing to. */ MOV.L #_pxCurrentTCB, R15 MOV.L [R15], R15 MOV.L [R15], R0 /* Restore the registers from the stack of the task pointed to by pxCurrentTCB. */ POP R15 /* Accumulator low 32 bits. */ MVTACLO R15 POP R15 /* Accumulator high 32 bits. */ MVTACHI R15 POP R15 /* Floating point status word. */ MVTC R15, FPSW /* R1 to R15 - R0 is not included as it is the SP. */ POPM R1-R15 /* This pops the remaining registers. */ RTE NOP NOP /*-----------------------------------------------------------*/ /* The software interrupt - overwrite the default 'weak' definition. */ ___interrupt_27: /* Re-enable interrupts. */ SETPSW I /* Move the data that was automatically pushed onto the interrupt stack when the interrupt occurred from the interrupt stack to the user stack. R15 is saved before it is clobbered. */ PUSH.L R15 /* Read the user stack pointer. */ MVFC USP, R15 /* Move the address down to the data being moved. */ SUB #12, R15 MVTC R15, USP /* Copy the data across, R15, then PC, then PSW. */ MOV.L [ R0 ], [ R15 ] MOV.L 4[ R0 ], 4[ R15 ] MOV.L 8[ R0 ], 8[ R15 ] /* Move the interrupt stack pointer to its new correct position. */ ADD #12, R0 /* All the rest of the registers are saved directly to the user stack. */ SETPSW U /* Save the rest of the general registers (R15 has been saved already). */ PUSHM R1-R14 /* Save the FPSW and accumulator. */ MVFC FPSW, R15 PUSH.L R15 MVFACHI R15 PUSH.L R15 /* Middle word. */ MVFACMI R15 /* Shifted left as it is restored to the low order word. */ SHLL #16, R15 PUSH.L R15 /* Save the stack pointer to the TCB. */ MOV.L #_pxCurrentTCB, R15 MOV.L [ R15 ], R15 MOV.L R0, [ R15 ] /* Ensure the interrupt mask is set to the syscall priority while the kernel structures are being accessed. */ MVTIPL #configMAX_SYSCALL_INTERRUPT_PRIORITY /* Select the next task to run. */ BSR.A _vTaskSwitchContext /* Reset the interrupt mask as no more data structure access is required. */ MVTIPL #configKERNEL_INTERRUPT_PRIORITY /* Load the stack pointer of the task that is now selected as the Running state task from its TCB. */ MOV.L #_pxCurrentTCB,R15 MOV.L [ R15 ], R15 MOV.L [ R15 ], R0 /* Restore the context of the new task. The PSW (Program Status Word) and PC will be popped by the RTE instruction. */ POP R15 MVTACLO R15 POP R15 MVTACHI R15 POP R15 MVTC R15, FPSW POPM R1-R15 RTE NOP NOP /*-----------------------------------------------------------*/ END
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