X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=z80comp2;a=blobdiff_plain;f=emu%2Fsrc%2Femu.c;fp=emu%2Fsrc%2Femu.c;h=01f798a56ccb41cb9b0a13d5adeab590dadb559a;hp=0000000000000000000000000000000000000000;hb=a0a85eb847ff3bb5da13e78618efdcd1b9f588cf;hpb=b55f31d1ac4a1991f2ad7b2d17be06969ea25e47

diff --git a/emu/src/emu.c b/emu/src/emu.c
new file mode 100644
index 0000000..01f798a
--- /dev/null
+++ b/emu/src/emu.c
@@ -0,0 +1,74 @@
+#include <stdlib.h>
+#include "emu.h"
+#include "cpu.h"
+#include "duart.h"
+
+#define RAM_SIZE	0x8000
+static uint8_t ram[RAM_SIZE];
+static uint8_t *rom;
+static int rom_size;
+
+int emu_init(void *romimg, int romsz)
+{
+	rom = romimg;
+	rom_size = romsz;
+
+	emu_reset();
+	return 0;
+}
+
+void emu_reset(void)
+{
+	cpu_reset();
+	duart_reset();
+}
+
+void emu_cleanup(void)
+{
+}
+
+void emu_step(void)
+{
+	cpu_step();
+}
+
+uint8_t emu_mem_read(uint16_t addr)
+{
+	if(addr & 0x8000) {	/* RAM */
+		return ram[addr & 0x7fff];
+	} else { /* ROM */
+		if((int)addr < rom_size) {
+			return rom[addr];
+		}
+	}
+	return 0;
+}
+
+void emu_mem_write(uint16_t addr, uint8_t data)
+{
+	if(addr & 0x8000) {
+		ram[addr & 0x7fff] = data;
+	}
+}
+
+uint8_t emu_io_read(uint16_t addr)
+{
+	if((addr & 0xf0) == 0) {
+		return duart_read(addr & 0xf);
+	}
+
+	/* nothing is enabled, the bus floats, return random bits */
+	return rand();
+}
+
+void emu_io_write(uint16_t addr, uint8_t data)
+{
+	if((addr & 0xf0) == 0) {
+		duart_write(addr & 0xf, data);
+	}
+}
+
+void emu_serin(int port, int c)
+{
+	duart_serin(port, c);
+}