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108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* QEMU MC146818 RTC emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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//#define DEBUG_CMOS
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struct RTCState {
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uint8_t cmos_data[128];
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uint8_t cmos_index;
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};
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void rtc_set_memory(RTCState *s, int addr, int val)
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{
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if (addr >= 0 && addr <= 127)
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s->cmos_data[addr] = val;
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}
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static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
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{
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RTCState *s = opaque;
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if ((addr & 1) == 0) {
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s->cmos_index = data & 0x7f;
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} else {
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#ifdef DEBUG_CMOS
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printf("cmos: write index=0x%02x val=0x%02x\n",
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s->cmos_index, data);
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#endif
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s->cmos_data[s->cmos_index] = data;
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}
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}
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static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
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{
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RTCState *s = opaque;
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int ret;
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if ((addr & 1) == 0) {
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return 0xff;
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} else {
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ret = s->cmos_data[s->cmos_index];
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#ifdef DEBUG_CMOS
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printf("cmos: read index=0x%02x val=0x%02x\n",
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s->cmos_index, ret);
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#endif
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return ret;
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}
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}
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static void rtc_save(QEMUFile *f, void *opaque)
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{
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RTCState *s = opaque;
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qemu_put_buffer(f, s->cmos_data, 128);
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qemu_put_8s(f, &s->cmos_index);
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}
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static int rtc_load(QEMUFile *f, void *opaque, int version_id)
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{
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RTCState *s = opaque;
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if (version_id != 1)
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return -EINVAL;
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qemu_get_buffer(f, s->cmos_data, 128);
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qemu_get_8s(f, &s->cmos_index);
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return 0;
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}
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RTCState *rtc_init(int base, int irq)
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{
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RTCState *s;
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s = qemu_mallocz(sizeof(RTCState));
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if (!s)
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return NULL;
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register_ioport_write(base, 2, 1, cmos_ioport_write, s);
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register_ioport_read(base, 2, 1, cmos_ioport_read, s);
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register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
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return s;
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}
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void rtc_set_date(RTCState *s, const struct tm *tm) {}
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