Rewrite PS2KB using the new devctl interface

kernel/dev/ps2kbdev.c

@@ -0,0 +1,35 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "kprintf.h"
+#include "hal/hal.h"
+#include "ps2kbdev.h"
+#include "dev.h"
+#include "errors.h"
+#include "dlmalloc/malloc.h"
+
+Dev PS2KBDEV;
+Ps2KbFastBuf PS2KB_BUF;
+
+int32_t ps2kbdev_readch(uint8_t *buffer, size_t len, void *extra) {
+  (void)buffer; (void)len; (void)extra;
+  uint8_t b = 0;
+  spinlock_acquire(&PS2KB_BUF.spinlock);
+  int32_t r = rbuf_pop(&PS2KB_BUF.rbuf, &b);
+  spinlock_release(&PS2KB_BUF.spinlock);
+
+  if (r == 0) {
+    return b;
+  } else {
+    return E_NOTYET;
+  }
+}
+
+void ps2kbdev_init(void) {
+  hal_memset(&PS2KBDEV, 0, sizeof(PS2KBDEV));
+  PS2KBDEV.fns[0] = &ps2kbdev_readch;
+
+  const int bufsz = 0x1000;
+  uint8_t *buf = dlmalloc(bufsz);
+  rbuf_init(&PS2KB_BUF.rbuf, buf, bufsz);
+  PS2KB_BUF.init = true;
+}

kernel/dev/ps2kbdev.h

@@ -0,0 +1,22 @@
+#ifndef DEV_PS2KBDEV_H_
+#define DEV_PS2KBDEV_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include "dev.h"
+#include "rbuf/rbuf.h"
+#include "spinlock/spinlock.h"
+
+typedef struct {
+  RBuf rbuf;
+  SpinLock spinlock;
+  bool init;
+} Ps2KbFastBuf;
+
+void ps2kbdev_init(void);
+
+extern Dev PS2KBDEV;
+
+extern Ps2KbFastBuf PS2KB_BUF;
+
+#endif // DEV_PS2KBDEV_H_