74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* Serial Port Driver
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*/
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#include <system.h>
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#include <logging.h>
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#if 0
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void serial_handler_a(struct regs *r) {
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char serial = serial_recv(SERIAL_PORT_A);
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irq_ack(SERIAL_IRQ);
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if (serial == 13) serial = '\n';
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kprintf("%c", serial);
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serial_send(SERIAL_PORT_B, serial);
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}
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void serial_handler_b(struct regs *r) {
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char serial = serial_recv(SERIAL_PORT_B);
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irq_ack(SERIAL_IRQ - 1);
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serial_send(SERIAL_PORT_A, serial);
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}
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#endif
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void serial_enable(int device) {
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outportb(device + 1, 0x00);
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outportb(device + 3, 0x80); /* Enable divisor mode */
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outportb(device + 0, 0x01); /* Div Low: 01 Set the port to 115200 bps */
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outportb(device + 1, 0x00); /* Div High: 00 */
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outportb(device + 3, 0x03);
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outportb(device + 2, 0xC7);
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outportb(device + 4, 0x0B);
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}
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void serial_install(void) {
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debug_print(NOTICE, "Installing serial communication driver");
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serial_enable(SERIAL_PORT_A);
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serial_enable(SERIAL_PORT_B);
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#if 0
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irq_install_handler(SERIAL_IRQ, serial_handler_a); /* Install the serial input handler */
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irq_install_handler(SERIAL_IRQ - 1, serial_handler_b); /* Install the serial input handler */
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outportb(SERIAL_PORT_A + 1, 0x01); /* Enable interrupts on receive */
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outportb(SERIAL_PORT_B + 1, 0x01); /* Enable interrupts on receive */
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#endif
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}
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int serial_rcvd(int device) {
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return inportb(device + 5) & 1;
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}
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char serial_recv(int device) {
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while (serial_rcvd(device) == 0) ;
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return inportb(device);
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}
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char serial_recv_async(int device) {
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return inportb(device);
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}
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int serial_transmit_empty(int device) {
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return inportb(device + 5) & 0x20;
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}
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void serial_send(int device, char out) {
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while (serial_transmit_empty(device) == 0);
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outportb(device, out);
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}
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void serial_string(int device, char * out) {
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for (uint32_t i = 0; i < strlen(out); ++i) {
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serial_send(device, out[i]);
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}
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}
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