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Tidy up and comment.

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This commit is contained in:
Richard Barry 2009-02-04 16:53:52 +00:00
parent bfd67da1e7
commit c1a2e601a6
3 changed files with 64 additions and 72 deletions
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40
Source/portable/IAR/78K0R/ISR_Support.h
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@ -39,29 +39,28 @@
;------------------------------------------------------------------------------
; portSAVE_CONTEXT MACRO
; Saves the context of the remaining general purpose registers, CS and ES
; (only in far memory mode) registers
; the usCriticalNesting Value and the Stack Pointer
; Saves the context of the general purpose registers, CS and ES (only in far
; memory mode) registers the usCriticalNesting Value and the Stack Pointer
; of the active Task onto the task stack
;------------------------------------------------------------------------------
portSAVE_CONTEXT MACRO
PUSH AX ; save AX Register to stack
PUSH AX ; Save AX Register to stack.
PUSH HL
#if configMEMORY_MODE == 1
MOV A, CS ; save CS register
MOV A, CS ; Save CS register.
XCH A, X
MOV A, ES ; save ES register
MOV A, ES ; Save ES register.
PUSH AX
#else
MOV A, CS ; save CS register
MOV A, CS ; Save CS register.
PUSH AX
#endif
PUSH DE ; save the remaining general purpose registers
PUSH DE ; Save the remaining general purpose registers.
PUSH BC
MOVW AX, usCriticalNesting ; save the usCriticalNesting value
MOVW AX, usCriticalNesting ; Save the usCriticalNesting value.
PUSH AX
MOVW AX, pxCurrentTCB ; save the Stack pointer
MOVW AX, pxCurrentTCB ; Save the Stack pointer.
MOVW HL, AX
MOVW AX, SP
MOVW [HL], AX
@ -70,30 +69,29 @@ portSAVE_CONTEXT MACRO
;------------------------------------------------------------------------------
; portRESTORE_CONTEXT MACRO
; Restores the context of the Stack Pointer, usCriticalNesting
; value, general purpose registers and the CS and ES (only in far memory mode)
; Restores the task Stack Pointer then use this to restore usCriticalNesting,
; general purpose registers and the CS and ES (only in far memory mode)
; of the selected task from the task stack
;------------------------------------------------------------------------------
portRESTORE_CONTEXT MACRO
MOVW AX, pxCurrentTCB ; restore the Stack pointer
MOVW AX, pxCurrentTCB ; Restore the Stack pointer.
MOVW HL, AX
MOVW AX, [HL]
MOVW SP, AX
POP AX ; restore usCriticalNesting value
POP AX ; Restore usCriticalNesting value.
MOVW usCriticalNesting, AX
POP BC ; restore the necessary general purpose registers
POP BC ; Restore the necessary general purpose registers.
POP DE
#if configMEMORY_MODE == 1
POP AX ; restore the ES register
POP AX ; Restore the ES register.
MOV ES, A
XCH A, X ; restore the CS register
XCH A, X ; Restore the CS register.
MOV CS, A
#else
POP AX
MOV CS, A ; restore CS register
MOV CS, A ; Restore CS register.
#endif
POP HL ; restore general purpose register HL
POP AX ; restore AX
POP HL ; Restore general purpose register HL.
POP AX ; Restore AX.
ENDM
;------------------------------------------------------------------------------