Implement virtio-input devices

Author: shengwen-tw

Makefile

@@ -116,6 +116,16 @@ LDFLAGS += -lm
 # after git submodule.
 .DEFAULT_GOAL := all
 
+# virtio-input
+ENABLE_VIRTIOINPUT ?= 1
+ifneq ($(UNAME_S),Linux)
+    ENABLE_VIRTIOINPUT := 0
+endif
+$(call set-feature, VIRTIOINPUT)
+ifeq ($(call has, VIRTIOINPUT), 1)
+    OBJS_EXTRA += virtio-input.o
+endif
+
 # virtio-gpu
 ENABLE_VIRTIOGPU ?= 1
 ifneq ($(UNAME_S),Linux)

common.h

@@ -2,6 +2,9 @@
 
 #include "feature.h"
 
+#define BITS_PER_CHAR 8
+#define BITS_PER_LONG (BITS_PER_CHAR * sizeof(long))
+
 #define unlikely(x) __builtin_expect((x), 0)
 #define likely(x) __builtin_expect((x), 1)
 
@@ -17,6 +20,16 @@ static inline int ilog2(int x)
     return 31 - __builtin_clz(x | 1);
 }
 
+static inline void set_bit(unsigned long bit, unsigned long *word)
+{
+    *word |= (1 << bit);
+}
+
+static inline void bitmap_set_bit(unsigned long *map, unsigned long bit)
+{
+    set_bit(bit % BITS_PER_LONG, &map[bit / BITS_PER_LONG]);
+}
+
 /* Range check
  * For any variable range checking:
  *     if (x >= minx && x <= maxx) ...

device.h

@@ -12,6 +12,9 @@
 #define DTB_SIZE (1 * 1024 * 1024)
 #define INITRD_SIZE (8 * 1024 * 1024)
 
+#define SCREEN_WIDTH 1024
+#define SCREEN_HEIGHT 768
+
 void ram_read(hart_t *core,
               uint32_t *mem,
               const uint32_t addr,
@@ -275,6 +278,64 @@ void virtio_gpu_add_scanout(virtio_gpu_state_t *vgpu,
                             uint32_t height);
 #endif /* SEMU_HAS(VIRTIOGPU) */
 
+/* VirtIO Input */
+
+#if SEMU_HAS(VIRTIOINPUT)
+
+#define IRQ_VINPUT_KEYBOARD 7
+#define IRQ_VINPUT_KEYBOARD_BIT (1 << IRQ_VINPUT_KEYBOARD)
+
+#define IRQ_VINPUT_MOUSE 8
+#define IRQ_VINPUT_MOUSE_BIT (1 << IRQ_VINPUT_MOUSE)
+
+typedef struct {
+    uint32_t QueueNum;
+    uint32_t QueueDesc;
+    uint32_t QueueAvail;
+    uint32_t QueueUsed;
+    uint16_t last_avail;
+    bool ready;
+} virtio_input_queue_t;
+
+typedef struct {
+    /* feature negotiation */
+    uint32_t DeviceFeaturesSel;
+    uint32_t DriverFeatures;
+    uint32_t DriverFeaturesSel;
+    /* queue config */
+    uint32_t QueueSel;
+    virtio_input_queue_t queues[2];
+    /* status */
+    uint32_t Status;
+    uint32_t InterruptStatus;
+    /* supplied by environment */
+    uint32_t *ram;
+    /* implementation-specific */
+    int id;  // FIXME
+    void *priv;
+} virtio_input_state_t;
+
+void virtio_input_read(hart_t *vm,
+                       virtio_input_state_t *vinput,
+                       uint32_t addr,
+                       uint8_t width,
+                       uint32_t *value);
+
+void virtio_input_write(hart_t *vm,
+                        virtio_input_state_t *vinput,
+                        uint32_t addr,
+                        uint8_t width,
+                        uint32_t value);
+
+void virtio_input_init(virtio_input_state_t *vinput);
+
+void virtio_input_update_key(uint32_t key, uint32_t state);
+
+void virtio_input_update_mouse_button_state(uint32_t button, bool pressed);
+
+void virtio_input_update_cursor(uint32_t x, uint32_t y);
+#endif /* SEMU_HAS(VIRTIOINPUT) */
+
 /* ACLINT MTIMER */
 typedef struct {
     /* A MTIMER device has two separate base addresses: one for the MTIME
@@ -430,6 +491,10 @@ typedef struct {
 #endif
 #if SEMU_HAS(VIRTIOGPU)
     virtio_gpu_state_t vgpu;
+#endif
+#if SEMU_HAS(VIRTIOINPUT)
+    virtio_input_state_t vkeyboard;
+    virtio_input_state_t vmouse;
 #endif
     /* ACLINT */
     mtimer_state_t mtimer;

feature.h

@@ -22,5 +22,10 @@
 #define SEMU_FEATURE_VIRTIOGPU 1
 #endif
 
+/* virtio-input */
+#ifndef SEMU_FEATURE_VIRTIOINPUT
+#define SEMU_FEATURE_VIRTIOINPUT 1
+#endif
+
 /* Feature test macro */
 #define SEMU_HAS(x) SEMU_FEATURE_##x