* Move UART code into its own file

* Set up vectored interrupt controller
* Set up timer interrupt

uart.c

@@ -0,0 +1,79 @@
+#include "uart.h"
+
+#define UARTBASE 0xE000C000
+
+#define RBR 0x00
+#define THR 0x00
+#define DLL 0x00
+#define DLM 0x04
+#define IER 0x04
+#define IIR 0x08
+#define FCR 0x08
+
+#define LCR 0x0c
+#define LSR 0x14
+#define SCR 0x1c
+#define ACR 0x20
+#define FDR 0x28
+#define TER 0x30
+
+#define UREG(x) (((volatile unsigned char *)UARTBASE)[x])
+
+#define U0THRE ((UREG(LSR) & (1<<5))) /* UART0 transmitter holding register is empty */
+#define U0DR ((UREG(LSR) & (1<<0))) /* UART0 data ready */
+
+void init_uart(void)
+{
+	UREG(FDR) = 0x10; /* DivAddVal = 0, MulVal = 1 */
+
+	UREG(LCR) = 0x80;
+	UREG(DLM) = 0x00;
+	UREG(DLL) = 0x08; /* 14745600 / (16*115200) */
+	UREG(LCR) = 0x13;
+	UREG(FCR) = 0x07;
+}
+
+void putch(char c) {
+	while (!U0THRE);
+	UREG(THR) = c;
+}
+
+void putstr(char *s) {
+	while (*s) putch(*s++);
+}
+
+void putint(unsigned int n) {
+	char s[11];
+	int i;
+
+	i = 10;
+	s[i] = '\0';
+
+	do {
+		s[--i] = n % 10 + '0';
+	} while ((n /= 10) > 0);
+
+	putstr(s+i);
+}
+
+void puthex(unsigned int n) {
+	char s[9];
+	int i;
+
+	i = 8;
+	s[i] = '\0';
+
+	do {
+		int x = n % 16;
+		if (x > 9)
+			x += 'A' - '0' - 10;
+		s[--i] = x + '0';
+	} while ((n /= 16) > 0);
+
+	putstr(s+i);
+}
+
+char getch(void) {
+	while (!U0DR);
+	return UREG(RBR);
+}