Merge branch 'dummy' into 'master'

dummy: add dummy devices

See merge request projectn/nexus-am!48

am/src/dummy/input.c

+#include <am.h>
+#include <amdev.h>
+
+size_t __am_input_read(uintptr_t reg, void *buf, size_t size) {
+  switch (reg) {
+    case _DEVREG_INPUT_KBD: {
+      _DEV_INPUT_KBD_t *kbd = (_DEV_INPUT_KBD_t *)buf;
+      kbd->keydown = 0;
+      kbd->keycode = KEY_NONE;
+      return sizeof(_DEV_INPUT_KBD_t);
+    }
+  }
+  return 0;
+}

am/src/dummy/timer.c

+#include <am.h>
+#include <amdev.h>
+
+size_t __am_timer_read(uintptr_t reg, void *buf, size_t size) {
+  switch (reg) {
+    case _DEVREG_TIMER_UPTIME: {
+      _DEV_TIMER_UPTIME_t *uptime = (_DEV_TIMER_UPTIME_t *)buf;
+      uptime->hi = 0;
+      uptime->lo = 0;
+      return sizeof(_DEV_TIMER_UPTIME_t);
+    }
+    case _DEVREG_TIMER_DATE: {
+      _DEV_TIMER_DATE_t *rtc = (_DEV_TIMER_DATE_t *)buf;
+      rtc->second = 0;
+      rtc->minute = 0;
+      rtc->hour   = 0;
+      rtc->day    = 0;
+      rtc->month  = 0;
+      rtc->year   = 0;
+      return sizeof(_DEV_TIMER_DATE_t);
+    }
+  }
+  return 0;
+}
+
+void __am_timer_init() {
+}

am/src/dummy/video.c

+#include <am.h>
+#include <amdev.h>
+
+#define W 320
+#define H 240
+
+size_t __am_video_read(uintptr_t reg, void *buf, size_t size) {
+  switch (reg) {
+    case _DEVREG_VIDEO_INFO: {
+      _DEV_VIDEO_INFO_t *info = (_DEV_VIDEO_INFO_t *)buf;
+      info->width = W;
+      info->height = H;
+      return sizeof(_DEV_VIDEO_INFO_t);
+    }
+  }
+  return 0;
+}
+
+size_t __am_video_write(uintptr_t reg, void *buf, size_t size) {
+  return 0;
+}
+
+void __am_vga_init() {
+}