b138ac83b5
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@783 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
48 lines
822 B
C
48 lines
822 B
C
static void outb(unsigned char value, unsigned short port)
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{
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__builtin_outb(value, port);
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}
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static unsigned char inb(unsigned short port)
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{
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return __builtin_inb(port);
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}
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static int uart_can_tx_byte(void)
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{
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return inb(0x3f8 + 0x05) & 0x20;
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}
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static void uart_wait_to_tx_byte(void)
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{
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while(!uart_can_tx_byte())
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;
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}
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static void uart_wait_until_sent(void)
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{
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while(!(inb(0x3f8 + 0x05) & 0x40))
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;
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}
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static void uart_tx_byte(unsigned char data)
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{
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uart_wait_to_tx_byte();
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outb(data, 0x3f8 + 0x00);
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uart_wait_until_sent();
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}
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static void print_debug(const char *str)
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{
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unsigned char ch;
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while((ch = *str++) != '\0') {
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uart_tx_byte(ch);
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}
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}
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static void main(void)
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{
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print_debug("one\r\n");
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print_debug("two\r\n");
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}
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