diff options
author | Eric Biederman <ebiederm@xmission.com> | 2003-04-22 18:44:01 +0000 |
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committer | Eric Biederman <ebiederm@xmission.com> | 2003-04-22 18:44:01 +0000 |
commit | b138ac83b53da9abf3dc9a87a1cd4b3d3a8150bd (patch) | |
tree | c8b0e50e84a57a24e5dbce070a959f465985b445 /util/romcc/tests/hello_world.c | |
parent | 77d1a8311f29e65f68351719c5b0b223299ef8a9 (diff) |
- Checking latest version of romcc
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@783 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util/romcc/tests/hello_world.c')
-rw-r--r-- | util/romcc/tests/hello_world.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/util/romcc/tests/hello_world.c b/util/romcc/tests/hello_world.c new file mode 100644 index 0000000000..6dd80d89b8 --- /dev/null +++ b/util/romcc/tests/hello_world.c @@ -0,0 +1,128 @@ +void outb(unsigned char value, unsigned short port) +{ + __builtin_outb(value, port); +} + +unsigned char inb(unsigned short port) +{ + return __builtin_inb(port); +} + +/* Base Address */ +#ifndef TTYS0_BASE +#define TTYS0_BASE 0x3f8 +#endif + +#ifndef TTYS0_BAUD +#define TTYS0_BAUD 115200 +#endif + +#if ((115200%TTYS0_BAUD) != 0) +#error Bad ttys0 baud rate +#endif + +#if TTYS0_BAUD == 115200 +#define TTYS0_DIV (1) +#else +#define TTYS0_DIV (115200/TTYS0_BAUD) +#endif + +/* Line Control Settings */ +#ifndef TTYS0_LCS +/* Set 8bit, 1 stop bit, no parity */ +#define TTYS0_LCS 0x3 +#endif + +#define UART_LCS TTYS0_LCS + +/* Data */ +#define UART_RBR 0x00 +#define UART_TBR 0x00 + +/* Control */ +#define UART_IER 0x01 +#define UART_IIR 0x02 +#define UART_FCR 0x02 +#define UART_LCR 0x03 +#define UART_MCR 0x04 +#define UART_DLL 0x00 +#define UART_DLM 0x01 + +/* Status */ +#define UART_LSR 0x05 +#define UART_MSR 0x06 +#define UART_SCR 0x07 + +int uart_can_tx_byte(void) +{ + return inb(TTYS0_BASE + UART_LSR) & 0x20; +} + +void uart_wait_to_tx_byte(void) +{ + while(!uart_can_tx_byte()) + ; +} + +void uart_wait_until_sent(void) +{ + while(!(inb(TTYS0_BASE + UART_LSR) & 0x40)) + ; +} + +static void uart_tx_byte(unsigned char data) +{ + uart_wait_to_tx_byte(); + outb(data, TTYS0_BASE + UART_TBR); + /* Make certain the data clears the fifos */ + uart_wait_until_sent(); +} + + +void uart_init(void) +{ + /* disable interrupts */ + outb(0x0, TTYS0_BASE + UART_IER); + /* enable fifo's */ + outb(0x01, TTYS0_BASE + UART_FCR); + /* Set Baud Rate Divisor to 12 ==> 115200 Baud */ + outb(0x80 | UART_LCS, TTYS0_BASE + UART_LCR); + outb(TTYS0_DIV & 0xFF, TTYS0_BASE + UART_DLL); + outb((TTYS0_DIV >> 8) & 0xFF, TTYS0_BASE + UART_DLM); + outb(UART_LCS, TTYS0_BASE + UART_LCR); +} + + +void __console_tx_char(unsigned char byte) +{ + uart_tx_byte(byte); + +} + +void __console_tx_string(char *str) +{ + unsigned char ch; + while((ch = *str++) != '\0') { + __console_tx_char(ch); + } +} + + +void print_debug_char(unsigned char byte) { __console_tx_char(byte); } +void print_debug(char *str) { __console_tx_string(str); } + +void main(void) +{ + static const char msg[] = "hello world\r\n"; + uart_init(); +#if 0 + print_debug(msg); +#endif +#if 1 + print_debug("hello world\r\n"); + print_debug("how are you today\r\n"); +#endif + while(1) { + ; + } +} |