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Add initial PPC405 files - this is a work in progress not a completed port.

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Richard Barry 2008-02-24 11:42:27 +00:00
parent 8c0260568e
commit fedf9c7ba0
3 changed files with 444 additions and 0 deletions
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104
Source/portable/GCC/PPC405/portasm.s Normal file
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.extern pxCurrentTCB
.extern vTaskSwitchContext
.global vStartFirstTask
.global vPortYield
.set portCONTEXT_SIZE, 156
.set portR0_OFFSET, 152
.set portGPR_OFFSET, 32
.set portCR_OFFSET, 28
.set portXER_OFFSET, 24
.set portLR_OFFSET, 20
.set portCTR_OFFSET, 16
.set portUSPRG0_OFFSET, 12
.set portSRR0_OFFSET, 8
.set portSRR1_OFFSET, 4
.macro portRESTORE_CONTEXT
# 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 )
# Pop the special purpose registers
lwz R0, portSRR1_OFFSET( SP )
mtspr SRR1, R0
lwz R0, portSRR0_OFFSET( SP )
mtspr SRR0, R0
lwz R0, portUSPRG0_OFFSET( SP )
mtspr 256, R0 #USPRG0
lwz R0, portCTR_OFFSET( SP )
mtspr CTR, R0
lwz R0, portLR_OFFSET( SP )
mtspr LR, R0
lwz R0, portXER_OFFSET( SP )
mtspr XER, R0
lwz R0, portCR_OFFSET( SP )
mtcr R0
# Pop GPRs
lmw R2, portGPR_OFFSET( SP )
# Finally pop R0 and correct the stack pointer
lwz R0, portR0_OFFSET( SP )
addi R1, R1, portCONTEXT_SIZE
# Start the task running
rfi
.endm
.macro portSAVE_CONTEXT
# Make room on the stack.
subi R1, R1, portCONTEXT_SIZE
# Push R0, then the GPRs
stw R0, portR0_OFFSET( SP )
stm R2, portGPR_OFFSET( SP )
# Push the SFRs
mfcr R0
stw R0, portCR_OFFSET( SP )
mfspr R0, XER
stw R0, portXER_OFFSET( SP )
mfspr R0, LR
stw R0, portLR_OFFSET( SP )
mfspr R0, CTR
stw R0, portCTR_OFFSET( SP )
mfspr R0, 256 #USPRG0
stw R0, portUSPRG0_OFFSET( SP )
mfspr R0, SRR0
stw R0, portSRR0_OFFSET( SP )
mfspr R0, SRR1
stw R0, portSRR1_OFFSET( SP )
# 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
vStartFirstTask:
portRESTORE_CONTEXT
rfi
vPortYield:
portSAVE_CONTEXT
bl vTaskSwitchContext
portRESTORE_CONTEXT
NOP
NOP