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Work in progress, for backup purposes only.

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This commit is contained in:
Richard Barry 2008-02-25 09:56:56 +00:00
parent fedf9c7ba0
commit 3c2306ed72
2 changed files with 128 additions and 21 deletions
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111
Source/portable/GCC/PPC405/portasm.s
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@ -1,3 +1,5 @@
#include "xreg405.h"
.extern pxCurrentTCB
.extern vTaskSwitchContext
@ -15,6 +17,22 @@
.set portSRR0_OFFSET, 8
.set portSRR1_OFFSET, 4
.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 portRESTORE_CONTEXT
# Get the address of the TCB.
@ -88,17 +106,104 @@
.endm
.macro int_epilogue
# Get the address of the TCB.
xor R0, R0, R0
addis SP, R0, pxCurrentTCB@ha
lwz 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
.endm
.macro portENTER_SWITCHING_ISR
# Get the address of the TCB.
xor R0, R0, R0
addis R2, R0, pxCurrentTCB@ha
lwz R2, pxCurrentTCB@l( R2 )
# Store the stack pointer into the TCB
stw SP, 0( R2 )
.endm
.macro portEXIT_SWITCHING_ISR
# Get the address of the TCB.
xor R0, R0, R0
addis SP, R0, pxCurrentTCB@ha
lwz SP, pxCurrentTCB@l( R1 )
# Get the task stack pointer from the TCB.
lwz SP, 0( SP )
# Load up the LR for the correct return.
lwz R0,LRField(R1)
mtlr R0
.endm
vStartFirstTask:
portRESTORE_CONTEXT
int_epilogue
rfi
#vStartFirstTask:
# portRESTORE_CONTEXT
# rfi
vPortYield:
portSAVE_CONTEXT
portENTER_SWITCHING_ISR
bl vTaskSwitchContext
portRESTORE_CONTEXT
portEXIT_SWITCHING_ISR
blr
NOP
NOP