qemu/hw/syborg_rtc.c
Alexander Graf 2507c12ab0 Add endianness as io mem parameter
As stated before, devices can be little, big or native endian. The
target endianness is not of their concern, so we need to push things
down a level.

This patch adds a parameter to cpu_register_io_memory that allows a
device to choose its endianness. For now, all devices simply choose
native endian, because that's the same behavior as before.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-12-11 15:24:25 +00:00

151 lines
4.1 KiB
C

/*
* Syborg RTC
*
* Copyright (c) 2008 CodeSourcery
*
* 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysbus.h"
#include "qemu-timer.h"
#include "syborg.h"
enum {
RTC_ID = 0,
RTC_LATCH = 1,
RTC_DATA_LOW = 2,
RTC_DATA_HIGH = 3
};
typedef struct {
SysBusDevice busdev;
int64_t offset;
int64_t data;
qemu_irq irq;
} SyborgRTCState;
static uint32_t syborg_rtc_read(void *opaque, target_phys_addr_t offset)
{
SyborgRTCState *s = (SyborgRTCState *)opaque;
offset &= 0xfff;
switch (offset >> 2) {
case RTC_ID:
return SYBORG_ID_RTC;
case RTC_DATA_LOW:
return (uint32_t)s->data;
case RTC_DATA_HIGH:
return (uint32_t)(s->data >> 32);
default:
cpu_abort(cpu_single_env, "syborg_rtc_read: Bad offset %x\n",
(int)offset);
return 0;
}
}
static void syborg_rtc_write(void *opaque, target_phys_addr_t offset, uint32_t value)
{
SyborgRTCState *s = (SyborgRTCState *)opaque;
uint64_t now;
offset &= 0xfff;
switch (offset >> 2) {
case RTC_LATCH:
now = qemu_get_clock(vm_clock);
if (value >= 4) {
s->offset = s->data - now;
} else {
s->data = now + s->offset;
while (value) {
s->data /= 1000;
value--;
}
}
break;
case RTC_DATA_LOW:
s->data = (s->data & ~(uint64_t)0xffffffffu) | value;
break;
case RTC_DATA_HIGH:
s->data = (s->data & 0xffffffffu) | ((uint64_t)value << 32);
break;
default:
cpu_abort(cpu_single_env, "syborg_rtc_write: Bad offset %x\n",
(int)offset);
break;
}
}
static CPUReadMemoryFunc * const syborg_rtc_readfn[] = {
syborg_rtc_read,
syborg_rtc_read,
syborg_rtc_read
};
static CPUWriteMemoryFunc * const syborg_rtc_writefn[] = {
syborg_rtc_write,
syborg_rtc_write,
syborg_rtc_write
};
static void syborg_rtc_save(QEMUFile *f, void *opaque)
{
SyborgRTCState *s = opaque;
qemu_put_be64(f, s->offset);
qemu_put_be64(f, s->data);
}
static int syborg_rtc_load(QEMUFile *f, void *opaque, int version_id)
{
SyborgRTCState *s = opaque;
if (version_id != 1)
return -EINVAL;
s->offset = qemu_get_be64(f);
s->data = qemu_get_be64(f);
return 0;
}
static int syborg_rtc_init(SysBusDevice *dev)
{
SyborgRTCState *s = FROM_SYSBUS(SyborgRTCState, dev);
struct tm tm;
int iomemtype;
iomemtype = cpu_register_io_memory(syborg_rtc_readfn,
syborg_rtc_writefn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, 0x1000, iomemtype);
qemu_get_timedate(&tm, 0);
s->offset = (uint64_t)mktime(&tm) * 1000000000;
register_savevm(&dev->qdev, "syborg_rtc", -1, 1,
syborg_rtc_save, syborg_rtc_load, s);
return 0;
}
static void syborg_rtc_register_devices(void)
{
sysbus_register_dev("syborg,rtc", sizeof(SyborgRTCState), syborg_rtc_init);
}
device_init(syborg_rtc_register_devices)