148 lines
2.8 KiB
ArmAsm
148 lines
2.8 KiB
ArmAsm
#include "xreg405.h"
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.extern pxCurrentTCB
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.extern vTaskSwitchContext
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.extern vTaskIncrementTick
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.extern vPortISRHandler
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.global vPortStartFirstTask
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.global vPortYield
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.global vPortTickISR
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.global vPortISRWrapper
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.set BChainField, 0
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.set NextLRField, BChainField + 4
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.set MSRField, NextLRField + 4
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.set PCField, MSRField + 4
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.set LRField, PCField + 4
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.set CTRField, LRField + 4
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.set XERField, CTRField + 4
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.set CRField, XERField + 4
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.set USPRG0Field, CRField + 4
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.set r0Field, USPRG0Field + 4
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.set r2Field, r0Field + 4
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.set r3r31Field, r2Field + 4
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.set IFrameSize, r3r31Field + ( ( 31 - 3 ) + 1 ) * 4
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.macro portSAVE_STACK_POINTER_AND_LR
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# Get the address of the TCB.
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xor R0, R0, R0
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addis R2, R0, pxCurrentTCB@ha
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lwz R2, pxCurrentTCB@l( R2 )
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# Store the stack pointer into the TCB
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stw SP, 0( R2 )
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# Save the link register
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stwu R1, -24( R1 )
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mflr R0
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stw R31, 20( R1 )
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stw R0, 28( R1 )
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mr R31, r1
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.endm
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.macro portRESTORE_STACK_POINTER_AND_LR
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# Restore the link register
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lwz R11, 0( R1 )
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lwz R0, 4( R11 )
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mtlr R0
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lwz R31, -4( R11 )
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mr R1, R11
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# Get the address of the TCB.
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xor R0, R0, R0
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addis SP, R0, pxCurrentTCB@ha
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lwz SP, pxCurrentTCB@l( R1 )
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# Get the task stack pointer from the TCB.
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lwz SP, 0( SP )
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.endm
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vPortStartFirstTask:
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# Get the address of the TCB.
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xor R0, R0, R0
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addis SP, R0, pxCurrentTCB@ha
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lwz SP, pxCurrentTCB@l( SP )
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# Get the task stack pointer from the TCB.
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lwz SP, 0( SP )
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# Restore MSR register to SRR1.
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lwz R0, MSRField(R1)
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mtsrr1 R0
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# Restore current PC location to SRR0.
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lwz R0, PCField(R1)
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mtsrr0 R0
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# Save USPRG0 register
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lwz R0, USPRG0Field(R1)
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mtspr 0x100,R0
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# Restore Condition register
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lwz R0, CRField(R1)
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mtcr R0
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# Restore Fixed Point Exception register
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lwz R0, XERField(R1)
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mtxer R0
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# Restore Counter register
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lwz R0, CTRField(R1)
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mtctr R0
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# Restore Link register
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lwz R0, LRField(R1)
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mtlr R0
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# Restore remaining GPR registers.
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lmw R3,r3r31Field(R1)
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# Restore r0 and r2.
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lwz R0, r0Field(R1)
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lwz R2, r2Field(R1)
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# Remove frame from stack
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addi R1,R1,IFrameSize
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# Return into the first task
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rfi
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vPortYield:
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portSAVE_STACK_POINTER_AND_LR
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bl vTaskSwitchContext
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portRESTORE_STACK_POINTER_AND_LR
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blr
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vPortTickISR:
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portSAVE_STACK_POINTER_AND_LR
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bl vTaskIncrementTick
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#if configUSE_PREEMPTION == 1
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bl vTaskSwitchContext
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#endif
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# Clear the interrupt
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lis R0, 2048
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mttsr R0
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portRESTORE_STACK_POINTER_AND_LR
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blr
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vPortISRWrapper:
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portSAVE_STACK_POINTER_AND_LR
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bl vPortISRHandler
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portRESTORE_STACK_POINTER_AND_LR
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blr
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