6502/rk65c02
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Attempt to design a semi-flexible device subsystem.

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This commit is contained in:
Radosław Kujawa 2017-02-19 21:45:15 +01:00
parent 0df6387a41
commit 7baefe9277
5 changed files with 55 additions and 21 deletions
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3
src/Makefile
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@ -11,6 +11,7 @@ CFLAGS=-Wall -fpic -ggdb
65C02ISA=65c02isa
EMULATION=emulation
DEVICE=device
# TODO: better include handling
all : $(LIB_SO) $(LIB_STATIC) $(CLI)
@ -31,7 +32,7 @@ $(EMULATION).h : $(65C02ISA).csv $(EMULATION).awk
awk -f $(EMULATION).awk $(65C02ISA).csv > $(EMULATION).h
# XXX: dependency on 65c02isa.h is only for instruction.c ?
%.o : %.c %.h $(65C02ISA).h $(EMULATION).h
%.o : %.c %.h $(65C02ISA).h $(EMULATION).h $(DEVICE).h
$(CC) $(CFLAGS) -c $<
clean :

34
src/bus.c
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@ -1,27 +1,23 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
//#include <stdbool.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <fcntl.h>
//#include <string.h>
//#include <fcntl.h>
#include <sys/types.h>
#include "bus.h"
#define RK65C02_BUS_SIZE 64*1024
struct bus_tag {
uint8_t *space;
};
typedef struct bus_tag bus_t;
uint8_t
bus_read_1(bus_t *t, uint16_t addr)
{
uint8_t val;
val = t->space[addr];
// val = t->space[addr];
/* printf("bus READ @ %x value %x\n", addr, val); */
return val;
}
@ -30,7 +26,7 @@ void
bus_write_1(bus_t *t, uint16_t addr, uint8_t val)
{
/* printf("bus WRITE @ %x value %x\n", addr, val); */
t->space[addr] = val;
// t->space[addr] = val;
}
bus_t
@ -38,15 +34,15 @@ bus_init()
{
bus_t t;
t.space = (uint8_t *) malloc(RK65C02_BUS_SIZE);
// t.space = (uint8_t *) malloc(RK65C02_BUS_SIZE);
assert(t.space != NULL);
// assert(t.space != NULL);
memset(t.space, 0, RK65C02_BUS_SIZE);
// memset(t.space, 0, RK65C02_BUS_SIZE);
return t;
}
/*
bool
bus_load_buf(bus_t *t, uint16_t addr, uint8_t *buf, uint16_t bufsize)
{
@ -54,7 +50,7 @@ bus_load_buf(bus_t *t, uint16_t addr, uint8_t *buf, uint16_t bufsize)
i = 0;
/* XXX: add sanity checks */
// XXX: add sanity checks
while (i < bufsize) {
t->space[addr+i] = buf[i]; // XXX: overflow addr
@ -84,13 +80,13 @@ bus_load_file(bus_t *t, uint16_t addr, const char *filename)
return true;
}
*/
void
bus_finish(bus_t *t)
{
assert(t != NULL);
assert(t->space != NULL);
// assert(t->space != NULL);
free(t->space);
// free(t->space);
}

4
src/bus.h
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@ -4,10 +4,12 @@
#include <stdint.h>
#include <stdbool.h>
#include "device.h"
#define RK65C02_BUS_SIZE 64*1024
struct bus_tag {
uint8_t *space;
device_t *device_head;
};
typedef struct bus_tag bus_t;

27
src/device.h Normal file
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@ -0,0 +1,27 @@
#ifndef _DEVICE_H_
#define _DEVICE_H_
//#include "bus.h"
typedef struct device_space_t {
//uint8_t id;
uint16_t address;
uint16_t size;
uint8_t (*read_1)(uint16_t addr);
void (*write_1)(uint16_t addr, uint8_t val);
void *aux; /* any additional space-specific data */
struct device_space_t *next;
} device_space_t;
typedef struct device_t {
const char *name;
device_space_t *space_head;
struct device_t *next;
} device_t;
#endif /* _DEVICE_H_ */

8
src/device_ram.c Normal file
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@ -0,0 +1,8 @@
#include "bus.h"
#include "device.h"
bool
device_ram_add(bus_t *t)
{
}