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|
;
; ======== vectors.asm ========
; Plug in the entry point at RESET in the interrupt vector table
;
;
; ======== unused ========
; plug inifinite loop -- with nested branches to
; disable interrupts -- for all undefined vectors
;
unused .macro id
.global unused:id:
unused:id:
b unused:id: ; nested branches to block interrupts
nop 4
b unused:id:
nop
nop
nop
nop
nop
.endm
.sect ".vectors"
.ref _c_int00 ; C entry point
.align 32*8*4 ; must be aligned on 256 word boundary
RESET: ; reset vector
mvkl _c_int00,b0 ; load destination function address to b0
mvkh _c_int00,b0
b b0 ; start branch to destination function
mvc PCE1,b0 ; address of interrupt vectors
mvc b0,ISTP ; set table to point here
nop 3 ; fill delay slot
nop
nop
;
; plug unused interrupts with infinite loops to
; catch stray interrupts
;
unused 1
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|
