Serial comm kernel process

kernel/proc/proc.c

@@ -16,6 +16,7 @@
 #include "kproc/kproc.h"
 #include "ps2kbproc/ps2kbproc.h"
 #include "termproc/termproc.h"
+#include "serialproc/serialproc.h"
 
 #define PROC_REAPER_FREQ 30
 
@@ -298,6 +299,9 @@ void proc_init(void) {
   termproc_init(proc_spawnkern(&termproc_fn, "termproc"));
   proc_register(TERMPROC);
 
+  serialproc_init(proc_spawnkern(&serialproc_fn, "serialproc"));
+  proc_register(SERIALPROC);
+
   Proc *init = proc_spawnuser("base", "/bin/init");
   init->pipes[0] = TERMPROC->pipes[1];
   proc_register(init);

kernel/proc/serialproc/serialproc.c

@@ -0,0 +1,73 @@
+#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->pipes[1] = dlmalloc(sizeof(IpcPipe));
+  ipc_pipeinit(SERIALPROC->pipes[1]);
+  
+  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));
+    int32_t read = ipc_piperead(SERIALPROC->pipes[1], (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);
+    ipc_pipewrite(SERIALPROC->pipes[0], &inchar, sizeof(inchar));
+  }
+}

kernel/proc/serialproc/serialproc.h

@@ -0,0 +1,11 @@
+#ifndef PROC_SERIALPROC_SERIALPROC_H_
+#define PROC_SERIALPROC_SERIALPROC_H_
+
+#include "proc/proc.h"
+
+extern Proc *SERIALPROC;
+
+void serialproc_init(Proc *proc);
+void serialproc_fn(void);
+
+#endif // PROC_SERIALPROC_SERIALPROC_H_