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ps2: use the whole ps2 buffer but keep queue size

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Extend the used ps2 buffer size to the available buffer size but
keep the maximum ps2 queue size.

The next patch needs a few bytes of the larger buffer size.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20210810133258.8231-1-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2021-08-10 15:32:56 +02:00 committed by Gerd Hoffmann
parent bd662023e6
commit 47db243233
1 changed files with 20 additions and 49 deletions
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69
hw/input/ps2.c
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@ -74,7 +74,12 @@
#define MOUSE_STATUS_ENABLED 0x20
#define MOUSE_STATUS_SCALE21 0x10
#define PS2_QUEUE_SIZE 16 /* Buffer size required by PS/2 protocol */
/*
* PS/2 buffer size. Keep 256 bytes for compatibility with
* older QEMU versions.
*/
#define PS2_BUFFER_SIZE 256
#define PS2_QUEUE_SIZE 16 /* Queue size required by PS/2 protocol */
/* Bits for 'modifiers' field in PS2KbdState */
#define MOD_CTRL_L (1 << 0)
@ -85,9 +90,7 @@
#define MOD_ALT_R (1 << 5)
typedef struct {
/* Keep the data array 256 bytes long, which compatibility
with older qemu versions. */
uint8_t data[256];
uint8_t data[PS2_BUFFER_SIZE];
int rptr, wptr, count;
} PS2Queue;
@ -200,8 +203,9 @@ void ps2_queue_noirq(PS2State *s, int b)
}
q->data[q->wptr] = b;
if (++q->wptr == PS2_QUEUE_SIZE)
if (++q->wptr == PS2_BUFFER_SIZE) {
q->wptr = 0;
}
q->count++;
}
@ -509,13 +513,15 @@ uint32_t ps2_read_data(PS2State *s)
(needed for EMM386) */
/* XXX: need a timer to do things correctly */
index = q->rptr - 1;
if (index < 0)
index = PS2_QUEUE_SIZE - 1;
if (index < 0) {
index = PS2_BUFFER_SIZE - 1;
}
val = q->data[index];
} else {
val = q->data[q->rptr];
if (++q->rptr == PS2_QUEUE_SIZE)
if (++q->rptr == PS2_BUFFER_SIZE) {
q->rptr = 0;
}
q->count--;
/* reading deasserts IRQ */
s->update_irq(s->update_arg, 0);
@ -926,30 +932,17 @@ static void ps2_common_reset(PS2State *s)
static void ps2_common_post_load(PS2State *s)
{
PS2Queue *q = &s->queue;
uint8_t i, size;
uint8_t tmp_data[PS2_QUEUE_SIZE];
/* set the useful data buffer queue size, < PS2_QUEUE_SIZE */
size = q->count;
/* set the useful data buffer queue size <= PS2_QUEUE_SIZE */
if (q->count < 0) {
size = 0;
q->count = 0;
} else if (q->count > PS2_QUEUE_SIZE) {
size = PS2_QUEUE_SIZE;
q->count = PS2_QUEUE_SIZE;
}
/* move the queue elements to the start of data array */
for (i = 0; i < size; i++) {
if (q->rptr < 0 || q->rptr >= sizeof(q->data)) {
q->rptr = 0;
}
tmp_data[i] = q->data[q->rptr++];
}
memcpy(q->data, tmp_data, size);
/* reset rptr/wptr/count */
q->rptr = 0;
q->wptr = (size == PS2_QUEUE_SIZE) ? 0 : size;
q->count = size;
/* sanitize rptr and recalculate wptr */
q->rptr = q->rptr & (PS2_BUFFER_SIZE - 1);
q->wptr = (q->rptr + q->count) & (PS2_BUFFER_SIZE - 1);
}
static void ps2_kbd_reset(void *opaque)
@ -1053,22 +1046,11 @@ static int ps2_kbd_post_load(void* opaque, int version_id)
return 0;
}
static int ps2_kbd_pre_save(void *opaque)
{
PS2KbdState *s = (PS2KbdState *)opaque;
PS2State *ps2 = &s->common;
ps2_common_post_load(ps2);
return 0;
}
static const VMStateDescription vmstate_ps2_keyboard = {
.name = "ps2kbd",
.version_id = 3,
.minimum_version_id = 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),
@ -1093,22 +1075,11 @@ static int ps2_mouse_post_load(void *opaque, int version_id)
return 0;
}
static int ps2_mouse_pre_save(void *opaque)
{
PS2MouseState *s = (PS2MouseState *)opaque;
PS2State *ps2 = &s->common;
ps2_common_post_load(ps2);
return 0;
}
static const VMStateDescription vmstate_ps2_mouse = {
.name = "ps2mouse",
.version_id = 2,
.minimum_version_id = 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),