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Patch [2696648] Z80: interrupt flag stored in parity bit

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1640 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-03-22 19:52:48 +00:00
parent d37d164ac3
commit 7b0eee9849
1 changed files with 6 additions and 6 deletions
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12
configs/xtrs/src/xtrs_head.asm
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@ -1,7 +1,7 @@
;**************************************************************************
; configs/xtrs/src/xtrs_head.asm
;
; Copyright (C) 2008 Gregory Nutt. All rights reserved.
; Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
; Author: Gregory Nutt <spudmonkey@racsa.co.cr>
;
; Redistribution and use in source and binary forms, with or without
@ -42,7 +42,7 @@
; Register save area layout
XCPT_I == 0 ; Offset 0: Saved I w/interrupt state in carry
XCPT_I == 0 ; Offset 0: Saved I w/interrupt state in parity
XCPT_BC == 2 ; Offset 1: Saved BC register
XCPT_DE == 4 ; Offset 2: Saved DE register
XCPT_IX == 6 ; Offset 3: Saved IX register
@ -198,8 +198,8 @@ _up_rstcommon:
push bc ; Offset 1: BC
ld b, a ; Save the reset number in B
ld a, i ; Carry bit holds interrupt state
push af ; Offset 0: I with interrupt state in carry
ld a, i ; Parity bit holds interrupt state
push af ; Offset 0: I with interrupt state in parity
di
; Call the interrupt decode logic. SP points to the beggining of the reg structure
@ -221,7 +221,7 @@ _up_rstcommon:
; Restore registers. HL points to the beginning of the reg structure to restore
ex af, af' ; Select alternate AF
pop af ; Offset 0: AF' = I with interrupt state in carry
pop af ; Offset 0: AF' = I with interrupt state in parity
ex af, af' ; Restore original AF
pop bc ; Offset 1: BC
pop de ; Offset 2: DE
@ -244,7 +244,7 @@ _up_rstcommon:
; Restore interrupt state
ex af, af' ; Recover interrupt state
jr nc, nointenable ; No carry, IFF2=0, means disabled
jp po, nointenable ; Odd parity, IFF2=0, means disabled
ex af, af' ; Restore AF (before enabling interrupts)
ei ; yes
reti