native,ioe: add uart

am/src/native/ioe.c

@@ -7,6 +7,7 @@ static bool ioe_init_done = false;
 void __am_timer_init();
 void __am_gpu_init();
 void __am_input_init();
+void __am_uart_init();
 void __am_audio_init();
 void __am_disk_init();
 void __am_input_config(AM_INPUT_CONFIG_T *);
@@ -17,6 +18,9 @@ void __am_input_keybrd(AM_INPUT_KEYBRD_T *);
 void __am_gpu_config(AM_GPU_CONFIG_T *);
 void __am_gpu_status(AM_GPU_STATUS_T *);
 void __am_gpu_fbdraw(AM_GPU_FBDRAW_T *);
+void __am_uart_config(AM_UART_CONFIG_T *);
+void __am_uart_tx(AM_UART_TX_T *);
+void __am_uart_rx(AM_UART_RX_T *);
 void __am_audio_config(AM_AUDIO_CONFIG_T *);
 void __am_audio_ctrl(AM_AUDIO_CTRL_T *);
 void __am_audio_status(AM_AUDIO_STATUS_T *);
@@ -24,7 +28,6 @@ void __am_audio_play(AM_AUDIO_PLAY_T *);
 void __am_disk_config(AM_DISK_CONFIG_T *cfg);
 void __am_disk_status(AM_DISK_STATUS_T *stat);
 void __am_disk_blkio(AM_DISK_BLKIO_T *io);
-static void __am_uart_config(AM_UART_CONFIG_T *cfg)   { cfg->present = false; }
 static void __am_net_config (AM_NET_CONFIG_T *cfg)    { cfg->present = false; }
 
 typedef void (*handler_t)(void *buf);
@@ -38,6 +41,8 @@ static void *lut[128] = {
   [AM_GPU_FBDRAW  ] = __am_gpu_fbdraw,
   [AM_GPU_STATUS  ] = __am_gpu_status,
   [AM_UART_CONFIG ] = __am_uart_config,
+  [AM_UART_TX     ] = __am_uart_tx,
+  [AM_UART_RX     ] = __am_uart_rx,
   [AM_AUDIO_CONFIG] = __am_audio_config,
   [AM_AUDIO_CTRL  ] = __am_audio_ctrl,
   [AM_AUDIO_STATUS] = __am_audio_status,
@@ -63,6 +68,7 @@ void __am_ioe_init() {
   __am_timer_init();
   __am_gpu_init();
   __am_input_init();
+  __am_uart_init();
   __am_audio_init();
   __am_disk_init();
   ioe_init_done = true;

am/src/native/ioe/uart.c

@@ -0,0 +1,28 @@
+#include <am.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+
+void __am_uart_init() {
+  int ret = fcntl(STDIN_FILENO, F_GETFL);
+  assert(ret != -1);
+  int flag = ret | O_NONBLOCK;
+  ret = fcntl(STDIN_FILENO, F_SETFL, flag);
+  assert(ret != -1);
+}
+
+void __am_uart_config(AM_UART_CONFIG_T *cfg) {
+  cfg->present = true;
+}
+
+void __am_uart_tx(AM_UART_TX_T *uart) {
+  putchar(uart->data);
+}
+
+void __am_uart_rx(AM_UART_RX_T *uart) {
+  int ret = fgetc(stdin);
+  if (ret == EOF) ret = -1;
+  uart->data = ret;
+}

scripts/native.mk

@@ -8,6 +8,7 @@ AM_SRCS := native/trm.c \
            native/ioe/input.c \
            native/ioe/timer.c \
            native/ioe/gpu.c \
+           native/ioe/uart.c \
            native/ioe/audio.c \
            native/ioe/disk.c \