kernel_zp.s

; KrisOS Zeropage globals for Kernel
;
; Copyright 2020 Kris Foster
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in all
; copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; SOFTWARE.

.ifndef _KERNEL_ZP_
_KERNEL_ZP_ = 1

    .exportzp uptime

    .zeropage
uptime:     .res 2              ; Uptime of the K64, zeroed out

    .exportzp nmi_ptr
    .exportzp irq_ptr

    .segment "USERVECTORS": zeropage
nmi_ptr:    .res 2              ; Location of NMI routine
irq_ptr:    .res 2              ; Location of IRQ routine

.endif