I'm trying to write a simple virtual hardware for QEMU. This hw must only return the value 0 every time I read at 0x6f8 address.
It looks like simple but I'm not sure... this is what I do...
I wrote a file in hw dir called hwfitt.c and implements hwfitt_ioport_read and *hwfitt_init functions.
In hwfitt_ioport_read must be a function that implements the hardware read control right?
I take for instance parallel.c code and I write hwfitt function call in files where parallel's function are called (pc.c vl.c vl.h) and modified make file. I didn't implement hwupdate_update_irq as in parallel code. Is an error?
This is my hwfitt.c code. Can you support me?
Thanks
Alessandro
#include "vl.h"
#define HW_STS_READY 0x10
#define HW_STS_BUSY 0x80
#define HW_CTR_INIT 0x01
struct HwFittState {
uint8_t data;
uint8_t status;
uint8_t control;
int irq;
int irq_pending;
CharDriverState *chr;
int hw_driver;
};
/*static void hwupdate_update_irq(ParallelState *s)
{
if (s->irq_pending)
pic_set_irq(s->irq, 1);
else
pic_set_irq(s->irq, 0);
}*/
static uint32_t hwfitt_ioport_read(void *opaque, uint32_t addr) {
HwFittState *s = opaque;
uint32_t ret= 0xff;
addr &= 7;
switch(addr) {
case 0:
if(s->hw_driver) {
s->data=""> }
ret = s->data;
break;
case 1:
if(s->hw_driver) {
ret=s->status;
}
break;
case 2:
if(s->hw_driver) {
s->control=0x10;
}
ret = s->control;
break;
}
#ifdef DEBUG_PARALLEL
printf("hwfitt: read addr=0x%02x val=0x%02x\n", addr, ret);
#endif
return ret;
}
HwFittState *hwfitt_init(int base, int irq, CharDriverState *chr){
HwFittState *s;
s=qemu_mallocz(sizeof(HwFittState));
s->chr = chr;
s->hw_driver = 1;
s->irq = irq;
s->data = ""> s->status = HW_STS_READY;
s->status |= HW_STS_BUSY;
s->control = HW_CTR_INIT;
register_ioport_read(base, 8, 1, hwfitt_ioport_read, s);
return s;
}
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