diff options
| -rw-r--r-- | hw/input/ps2.c | 74 |
1 files changed, 68 insertions, 6 deletions
diff --git a/hw/input/ps2.c b/hw/input/ps2.c index 34120796b1..9a016eb843 100644 --- a/hw/input/ps2.c +++ b/hw/input/ps2.c @@ -71,10 +71,12 @@ #define MOUSE_STATUS_ENABLED 0x20 #define MOUSE_STATUS_SCALE21 0x10 -#define PS2_QUEUE_SIZE 256 +#define PS2_QUEUE_SIZE 16 /* Buffer size required by PS/2 protocol */ typedef struct { - uint8_t data[PS2_QUEUE_SIZE]; + /* Keep the data array 256 bytes long, which compatibility + with older qemu versions. */ + uint8_t data[256]; int rptr, wptr, count; } PS2Queue; @@ -137,7 +139,7 @@ void ps2_queue(void *opaque, int b) PS2State *s = (PS2State *)opaque; PS2Queue *q = &s->queue; - if (q->count >= PS2_QUEUE_SIZE) + if (q->count >= PS2_QUEUE_SIZE - 1) return; q->data[q->wptr] = b; if (++q->wptr == PS2_QUEUE_SIZE) @@ -374,9 +376,8 @@ static void ps2_mouse_event(void *opaque, qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); } - if (!(s->mouse_status & MOUSE_STATUS_REMOTE) && - (s->common.queue.count < (PS2_QUEUE_SIZE - 16))) { - for(;;) { + if (!(s->mouse_status & MOUSE_STATUS_REMOTE)) { + while (s->common.queue.count < PS2_QUEUE_SIZE - 4) { /* if not remote, send event. Multiple events are sent if too big deltas */ ps2_mouse_send_packet(s); @@ -528,6 +529,34 @@ static void ps2_common_reset(PS2State *s) s->update_irq(s->update_arg, 0); } +static void ps2_common_post_load(PS2State *s) +{ + PS2Queue *q = &s->queue; + int size; + int i; + int tmp_data[PS2_QUEUE_SIZE]; + + /* set the useful data buffer queue size, < PS2_QUEUE_SIZE */ + size = q->count > PS2_QUEUE_SIZE ? 0 : q->count; + + /* move the queue elements to the start of data array */ + if (size > 0) { + for (i = 0; i < size; i++) { + /* move the queue elements to the temporary buffer */ + tmp_data[i] = q->data[q->rptr]; + if (++q->rptr == 256) { + q->rptr = 0; + } + } + memcpy(q->data, tmp_data, size); + } + /* reset rptr/wptr/count */ + q->rptr = 0; + q->wptr = size; + q->count = size; + s->update_irq(s->update_arg, q->count != 0); +} + static void ps2_kbd_reset(void *opaque) { PS2KbdState *s = (PS2KbdState *) opaque; @@ -600,18 +629,31 @@ static const VMStateDescription vmstate_ps2_keyboard_ledstate = { static int ps2_kbd_post_load(void* opaque, int version_id) { PS2KbdState *s = (PS2KbdState*)opaque; + PS2State *ps2 = &s->common; if (version_id == 2) s->scancode_set=2; + + ps2_common_post_load(ps2); + return 0; } +static void ps2_kbd_pre_save(void *opaque) +{ + PS2KbdState *s = (PS2KbdState *)opaque; + PS2State *ps2 = &s->common; + + ps2_common_post_load(ps2); +} + static const VMStateDescription vmstate_ps2_keyboard = { .name = "ps2kbd", .version_id = 3, .minimum_version_id = 2, .minimum_version_id_old = 2, .post_load = ps2_kbd_post_load, + .pre_save = ps2_kbd_pre_save, .fields = (VMStateField []) { VMSTATE_STRUCT(common, PS2KbdState, 0, vmstate_ps2_common, PS2State), VMSTATE_INT32(scan_enabled, PS2KbdState), @@ -629,11 +671,31 @@ static const VMStateDescription vmstate_ps2_keyboard = { } }; +static int ps2_mouse_post_load(void *opaque, int version_id) +{ + PS2MouseState *s = (PS2MouseState *)opaque; + PS2State *ps2 = &s->common; + + ps2_common_post_load(ps2); + + return 0; +} + +static void ps2_mouse_pre_save(void *opaque) +{ + PS2MouseState *s = (PS2MouseState *)opaque; + PS2State *ps2 = &s->common; + + ps2_common_post_load(ps2); +} + static const VMStateDescription vmstate_ps2_mouse = { .name = "ps2mouse", .version_id = 2, .minimum_version_id = 2, .minimum_version_id_old = 2, + .post_load = ps2_mouse_post_load, + .pre_save = ps2_mouse_pre_save, .fields = (VMStateField []) { VMSTATE_STRUCT(common, PS2MouseState, 0, vmstate_ps2_common, PS2State), VMSTATE_UINT8(mouse_status, PS2MouseState), |