2c8d876ab8
arch/z80/src/ez80/ez80f92_init.asm: Timer control register was not being cleared and, as a result, timer interrupts may have been already enabled when the CPU was started by the debugger. This would result in spurious interrupts and Unexpected Interrupt crashes. arch/z80/src/comming/up_initialize.c: Fix a trivial typo. While we are at it, change the license headers in all relevant files in the affected directories to the Apache 2.0 license. Run all affected files through nxstyle.
90 lines
3.0 KiB
NASM
90 lines
3.0 KiB
NASM
;**************************************************************************
|
|
; arch/z80/src/ez80/ez80_irqsave.asm
|
|
;
|
|
; Licensed to the Apache Software Foundation (ASF) under one or more
|
|
; contributor license agreements. See the NOTICE file distributed with
|
|
; this work for additional information regarding copyright ownership. The
|
|
; ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
; "License"); you may not use this file except in compliance with the
|
|
; License. You may obtain a copy of the License at
|
|
;
|
|
; http://www.apache.org/licenses/LICENSE-2.0
|
|
;
|
|
; Unless required by applicable law or agreed to in writing, software
|
|
; distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
; WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
; License for the specific language governing permissions and limitations
|
|
; under the License.
|
|
;
|
|
;**************************************************************************
|
|
|
|
;**************************************************************************
|
|
; Global Symbols Imported
|
|
;**************************************************************************
|
|
|
|
;**************************************************************************
|
|
; Global Symbols Exported
|
|
;**************************************************************************
|
|
|
|
xdef _up_irq_save
|
|
xdef _up_irq_restore
|
|
xdef _up_irq_enable
|
|
|
|
;**************************************************************************
|
|
; Code
|
|
;**************************************************************************
|
|
|
|
segment CODE
|
|
.assume ADL=1
|
|
|
|
;**************************************************************************
|
|
;* Name: irqstate_t up_irq_save(void)
|
|
;*
|
|
;* Description:
|
|
;* Disable all interrupts; return previous interrupt state
|
|
;*
|
|
;**************************************************************************
|
|
|
|
_up_irq_save:
|
|
ld a, i ; AF = interrupt state
|
|
di ; Interrupts are disabled (does not affect F)
|
|
push af ; Transfer to HL via the stack
|
|
pop hl ;
|
|
ret ; And return
|
|
|
|
;**************************************************************************
|
|
;* Name: void up_irq_restore(irqstate_t flags)
|
|
;*
|
|
;* Description:
|
|
;* Restore previous interrupt state
|
|
;*
|
|
;**************************************************************************
|
|
|
|
_up_irq_restore:
|
|
di ; Assume disabled
|
|
pop hl ; HL = return address
|
|
pop af ; AF Parity bit holds interrupt state
|
|
jp po, _disabled ; Skip over re-enable if Parity odd
|
|
ei ; Re-enable interrupts
|
|
_disabled:
|
|
push af ; Restore stack
|
|
push hl ;
|
|
ret ; and return
|
|
|
|
;**************************************************************************
|
|
;* Name: irqstate_t up_irq_enable(void)
|
|
;*
|
|
;* Description:
|
|
;* Enable all interrupts; return previous interrupt state
|
|
;*
|
|
;**************************************************************************
|
|
|
|
_up_irq_enable:
|
|
ld a, i ; AF = interrupt state
|
|
ei ; Interrupts are enabled (does not affect F)
|
|
push af ; Transfer to HL via the stack
|
|
pop hl ;
|
|
ret ; And return
|
|
|
|
end
|