Files
my-os-project2/kernel/proc/serialproc/serialproc.c

80 lines
1.9 KiB
C

#include <stdint.h>
#include <stddef.h>
#include "proc/proc.h"
#include "ipc/pipe/pipe.h"
#include "hal/hal.h"
#include "dlmalloc/malloc.h"
#define SERIAL_PORT 0x3f8
Proc *SERIALPROC;
void serialproc_init(Proc *proc) {
SERIALPROC = proc;
SERIALPROC->pipes[0] = dlmalloc(sizeof(IpcPipe));
ipc_pipeinit(SERIALPROC->pipes[0], SERIALPROC->pid);
SERIALPROC->pipes[1] = dlmalloc(sizeof(IpcPipe));
ipc_pipeinit(SERIALPROC->pipes[1], SERIALPROC->pid);
io_out8(SERIAL_PORT + 1, 0x00);
io_out8(SERIAL_PORT + 3, 0x80);
io_out8(SERIAL_PORT + 0, 0x03);
io_out8(SERIAL_PORT + 1, 0x00);
io_out8(SERIAL_PORT + 3, 0x03);
io_out8(SERIAL_PORT + 2, 0xc7);
io_out8(SERIAL_PORT + 4, 0x0b);
io_out8(SERIAL_PORT + 4, 0x1e);
io_out8(SERIAL_PORT + 0, 0xae);
if (io_in8(SERIAL_PORT + 0) != 0xae) {
return;
}
io_out8(SERIAL_PORT + 4, 0x0f);
}
int serialproc_received(void) {
return io_in8(SERIAL_PORT + 5) & 1;
}
uint8_t serialproc_read(void) {
while (serialproc_received() == 0);
return io_in8(SERIAL_PORT);
}
int serialproc_trans_empty(void) {
return io_in8(SERIAL_PORT + 5) & 0x20;
}
void serialproc_write(uint8_t value) {
while (!serialproc_trans_empty());
io_out8(SERIAL_PORT, value);
}
void serialproc_fn(void) {
char buf[0x100];
for (;;) {
hal_memset(buf, 0, sizeof(buf));
spinlock_acquire(&SERIALPROC->pipes_spinlock);
IpcPipe *inpipe = SERIALPROC->pipes[1];
spinlock_release(&SERIALPROC->pipes_spinlock);
int32_t read = ipc_piperead(inpipe, (uint8_t *)buf, sizeof(buf));
if (read > 0) {
for (size_t i = 0; i < sizeof(buf); i++) {
serialproc_write(buf[i]);
}
}
if (serialproc_received() == 0) {
continue;
}
uint8_t inchar = io_in8(SERIAL_PORT);
spinlock_acquire(&SERIALPROC->pipes_spinlock);
IpcPipe *outpipe = SERIALPROC->pipes[0];
spinlock_release(&SERIALPROC->pipes_spinlock);
ipc_pipewrite(outpipe, &inchar, sizeof(inchar));
}
}