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qemu/hw/display/g364fb.c
Mark Cave-Ayland d5bfbaca39 g364fb: use RAM memory region for framebuffer 
Since the migration stream is already broken, we can use this opportunity to
change the framebuffer so that it is migrated as a RAM memory region rather
than as an array of bytes.

In particular this helps the output of the analyze-migration.py tool which
no longer contains a huge array representing the framebuffer contents.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210625163554.14879-2-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2021-07-02 17:35:08 +02:00

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/*
* QEMU G364 framebuffer Emulator.
*
* Copyright (c) 2007-2011 Herve Poussineau
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "hw/hw.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "ui/console.h"
#include "ui/pixel_ops.h"
#include "trace.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qom/object.h"
typedef struct G364State {
/* hardware */
uint32_t vram_size;
qemu_irq irq;
MemoryRegion mem_vram;
MemoryRegion mem_ctrl;
/* registers */
uint8_t color_palette[256][3];
uint8_t cursor_palette[3][3];
uint16_t cursor[512];
uint32_t cursor_position;
uint32_t ctla;
uint32_t top_of_screen;
uint32_t width, height; /* in pixels */
/* display refresh support */
QemuConsole *con;
int depth;
int blanked;
} G364State;
#define REG_BOOT 0x000000
#define REG_DISPLAY 0x000118
#define REG_VDISPLAY 0x000150
#define REG_CTLA 0x000300
#define REG_TOP 0x000400
#define REG_CURS_PAL 0x000508
#define REG_CURS_POS 0x000638
#define REG_CLR_PAL 0x000800
#define REG_CURS_PAT 0x001000
#define REG_RESET 0x100000
#define CTLA_FORCE_BLANK 0x00000400
#define CTLA_NO_CURSOR 0x00800000
#define G364_PAGE_SIZE 4096
static inline int check_dirty(G364State *s, DirtyBitmapSnapshot *snap, ram_addr_t page)
{
return memory_region_snapshot_get_dirty(&s->mem_vram, snap, page, G364_PAGE_SIZE);
}
static void g364fb_draw_graphic8(G364State *s)
{
DisplaySurface *surface = qemu_console_surface(s->con);
DirtyBitmapSnapshot *snap;
int i, w;
uint8_t *vram;
uint8_t *data_display, *dd;
ram_addr_t page;
int x, y;
int xmin, xmax;
int ymin, ymax;
int xcursor, ycursor;
unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
switch (surface_bits_per_pixel(surface)) {
case 8:
rgb_to_pixel = rgb_to_pixel8;
w = 1;
break;
case 15:
rgb_to_pixel = rgb_to_pixel15;
w = 2;
break;
case 16:
rgb_to_pixel = rgb_to_pixel16;
w = 2;
break;
case 32:
rgb_to_pixel = rgb_to_pixel32;
w = 4;
break;
default:
hw_error("g364: unknown host depth %d",
surface_bits_per_pixel(surface));
return;
}
page = 0;
x = y = 0;
xmin = s->width;
xmax = 0;
ymin = s->height;
ymax = 0;
if (!(s->ctla & CTLA_NO_CURSOR)) {
xcursor = s->cursor_position >> 12;
ycursor = s->cursor_position & 0xfff;
} else {
xcursor = ycursor = -65;
}
vram = memory_region_get_ram_ptr(&s->mem_vram) + s->top_of_screen;
/* XXX: out of range in vram? */
data_display = dd = surface_data(surface);
snap = memory_region_snapshot_and_clear_dirty(&s->mem_vram, 0, s->vram_size,
DIRTY_MEMORY_VGA);
while (y < s->height) {
if (check_dirty(s, snap, page)) {
if (y < ymin)
ymin = ymax = y;
if (x < xmin)
xmin = x;
for (i = 0; i < G364_PAGE_SIZE; i++) {
uint8_t index;
unsigned int color;
if (unlikely((y >= ycursor && y < ycursor + 64) &&
(x >= xcursor && x < xcursor + 64))) {
/* pointer area */
int xdiff = x - xcursor;
uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
int op = (curs >> ((xdiff & 7) * 2)) & 3;
if (likely(op == 0)) {
/* transparent */
index = *vram;
color = (*rgb_to_pixel)(
s->color_palette[index][0],
s->color_palette[index][1],
s->color_palette[index][2]);
} else {
/* get cursor color */
index = op - 1;
color = (*rgb_to_pixel)(
s->cursor_palette[index][0],
s->cursor_palette[index][1],
s->cursor_palette[index][2]);
}
} else {
/* normal area */
index = *vram;
color = (*rgb_to_pixel)(
s->color_palette[index][0],
s->color_palette[index][1],
s->color_palette[index][2]);
}
memcpy(dd, &color, w);
dd += w;
x++;
vram++;
if (x == s->width) {
xmax = s->width - 1;
y++;
if (y == s->height) {
ymax = s->height - 1;
goto done;
}
data_display = dd = data_display + surface_stride(surface);
xmin = 0;
x = 0;
}
}
if (x > xmax)
xmax = x;
if (y > ymax)
ymax = y;
} else {
int dy;
if (xmax || ymax) {
dpy_gfx_update(s->con, xmin, ymin,
xmax - xmin + 1, ymax - ymin + 1);
xmin = s->width;
xmax = 0;
ymin = s->height;
ymax = 0;
}
x += G364_PAGE_SIZE;
dy = x / s->width;
x = x % s->width;
y += dy;
vram += G364_PAGE_SIZE;
data_display += dy * surface_stride(surface);
dd = data_display + x * w;
}
page += G364_PAGE_SIZE;
}
done:
if (xmax || ymax) {
dpy_gfx_update(s->con, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
}
g_free(snap);
}
static void g364fb_draw_blank(G364State *s)
{
DisplaySurface *surface = qemu_console_surface(s->con);
int i, w;
uint8_t *d;
if (s->blanked) {
/* Screen is already blank. No need to redraw it */
return;
}
w = s->width * surface_bytes_per_pixel(surface);
d = surface_data(surface);
for (i = 0; i < s->height; i++) {
memset(d, 0, w);
d += surface_stride(surface);
}
dpy_gfx_update_full(s->con);
s->blanked = 1;
}
static void g364fb_update_display(void *opaque)
{
G364State *s = opaque;
DisplaySurface *surface = qemu_console_surface(s->con);
qemu_flush_coalesced_mmio_buffer();
if (s->width == 0 || s->height == 0)
return;
if (s->width != surface_width(surface) ||
s->height != surface_height(surface)) {
qemu_console_resize(s->con, s->width, s->height);
}
if (s->ctla & CTLA_FORCE_BLANK) {
g364fb_draw_blank(s);
} else if (s->depth == 8) {
g364fb_draw_graphic8(s);
} else {
error_report("g364: unknown guest depth %d", s->depth);
}
qemu_irq_raise(s->irq);
}
static inline void g364fb_invalidate_display(void *opaque)
{
G364State *s = opaque;
s->blanked = 0;
memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
}
static void g364fb_reset(G364State *s)
{
uint8_t *vram = memory_region_get_ram_ptr(&s->mem_vram);
qemu_irq_lower(s->irq);
memset(s->color_palette, 0, sizeof(s->color_palette));
memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
memset(s->cursor, 0, sizeof(s->cursor));
s->cursor_position = 0;
s->ctla = 0;
s->top_of_screen = 0;
s->width = s->height = 0;
memset(vram, 0, s->vram_size);
g364fb_invalidate_display(s);
}
/* called for accesses to io ports */
static uint64_t g364fb_ctrl_read(void *opaque,
hwaddr addr,
unsigned int size)
{
G364State *s = opaque;
uint32_t val;
if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
/* cursor pattern */
int idx = (addr - REG_CURS_PAT) >> 3;
val = s->cursor[idx];
} else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
/* cursor palette */
int idx = (addr - REG_CURS_PAL) >> 3;
val = ((uint32_t)s->cursor_palette[idx][0] << 16);
val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
} else {
switch (addr) {
case REG_DISPLAY:
val = s->width / 4;
break;
case REG_VDISPLAY:
val = s->height * 2;
break;
case REG_CTLA:
val = s->ctla;
break;
default:
{
error_report("g364: invalid read at [" TARGET_FMT_plx "]",
addr);
val = 0;
break;
}
}
}
trace_g364fb_read(addr, val);
return val;
}
static void g364fb_update_depth(G364State *s)
{
static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
s->depth = depths[(s->ctla & 0x00700000) >> 20];
}
static void g364_invalidate_cursor_position(G364State *s)
{
DisplaySurface *surface = qemu_console_surface(s->con);
int ymin, ymax, start, end;
/* invalidate only near the cursor */
ymin = s->cursor_position & 0xfff;
ymax = MIN(s->height, ymin + 64);
start = ymin * surface_stride(surface);
end = (ymax + 1) * surface_stride(surface);
memory_region_set_dirty(&s->mem_vram, start, end - start);
}
static void g364fb_ctrl_write(void *opaque,
hwaddr addr,
uint64_t val,
unsigned int size)
{
G364State *s = opaque;
trace_g364fb_write(addr, val);
if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
/* color palette */
int idx = (addr - REG_CLR_PAL) >> 3;
s->color_palette[idx][0] = (val >> 16) & 0xff;
s->color_palette[idx][1] = (val >> 8) & 0xff;
s->color_palette[idx][2] = val & 0xff;
g364fb_invalidate_display(s);
} else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
/* cursor pattern */
int idx = (addr - REG_CURS_PAT) >> 3;
s->cursor[idx] = val;
g364fb_invalidate_display(s);
} else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
/* cursor palette */
int idx = (addr - REG_CURS_PAL) >> 3;
s->cursor_palette[idx][0] = (val >> 16) & 0xff;
s->cursor_palette[idx][1] = (val >> 8) & 0xff;
s->cursor_palette[idx][2] = val & 0xff;
g364fb_invalidate_display(s);
} else {
switch (addr) {
case REG_BOOT: /* Boot timing */
case 0x00108: /* Line timing: half sync */
case 0x00110: /* Line timing: back porch */
case 0x00120: /* Line timing: short display */
case 0x00128: /* Frame timing: broad pulse */
case 0x00130: /* Frame timing: v sync */
case 0x00138: /* Frame timing: v preequalise */
case 0x00140: /* Frame timing: v postequalise */
case 0x00148: /* Frame timing: v blank */
case 0x00158: /* Line timing: line time */
case 0x00160: /* Frame store: line start */
case 0x00168: /* vram cycle: mem init */
case 0x00170: /* vram cycle: transfer delay */
case 0x00200: /* vram cycle: mask register */
/* ignore */
break;
case REG_TOP:
s->top_of_screen = val;
g364fb_invalidate_display(s);
break;
case REG_DISPLAY:
s->width = val * 4;
break;
case REG_VDISPLAY:
s->height = val / 2;
break;
case REG_CTLA:
s->ctla = val;
g364fb_update_depth(s);
g364fb_invalidate_display(s);
break;
case REG_CURS_POS:
g364_invalidate_cursor_position(s);
s->cursor_position = val;
g364_invalidate_cursor_position(s);
break;
case REG_RESET:
g364fb_reset(s);
break;
default:
error_report("g364: invalid write of 0x%" PRIx64
" at [" TARGET_FMT_plx "]", val, addr);
break;
}
}
qemu_irq_lower(s->irq);
}
static const MemoryRegionOps g364fb_ctrl_ops = {
.read = g364fb_ctrl_read,
.write = g364fb_ctrl_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl.min_access_size = 4,
.impl.max_access_size = 4,
};
static int g364fb_post_load(void *opaque, int version_id)
{
G364State *s = opaque;
/* force refresh */
g364fb_update_depth(s);
g364fb_invalidate_display(s);
return 0;
}
static const VMStateDescription vmstate_g364fb = {
.name = "g364fb",
.version_id = 2,
.minimum_version_id = 2,
.post_load = g364fb_post_load,
.fields = (VMStateField[]) {
VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
VMSTATE_UINT32(cursor_position, G364State),
VMSTATE_UINT32(ctla, G364State),
VMSTATE_UINT32(top_of_screen, G364State),
VMSTATE_UINT32(width, G364State),
VMSTATE_UINT32(height, G364State),
VMSTATE_END_OF_LIST()
}
};
static const GraphicHwOps g364fb_ops = {
.invalidate = g364fb_invalidate_display,
.gfx_update = g364fb_update_display,
};
static void g364fb_init(DeviceState *dev, G364State *s)
{
s->con = graphic_console_init(dev, 0, &g364fb_ops, s);
memory_region_init_io(&s->mem_ctrl, OBJECT(dev), &g364fb_ctrl_ops, s,
"ctrl", 0x180000);
memory_region_init_ram(&s->mem_vram, NULL, "g364fb.vram", s->vram_size,
&error_fatal);
memory_region_set_log(&s->mem_vram, true, DIRTY_MEMORY_VGA);
}
#define TYPE_G364 "sysbus-g364"
OBJECT_DECLARE_SIMPLE_TYPE(G364SysBusState, G364)
struct G364SysBusState {
SysBusDevice parent_obj;
G364State g364;
};
static void g364fb_sysbus_realize(DeviceState *dev, Error **errp)
{
G364SysBusState *sbs = G364(dev);
G364State *s = &sbs->g364;
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
g364fb_init(dev, s);
sysbus_init_irq(sbd, &s->irq);
sysbus_init_mmio(sbd, &s->mem_ctrl);
sysbus_init_mmio(sbd, &s->mem_vram);
}
static void g364fb_sysbus_reset(DeviceState *d)
{
G364SysBusState *s = G364(d);
g364fb_reset(&s->g364);
}
static Property g364fb_sysbus_properties[] = {
DEFINE_PROP_UINT32("vram_size", G364SysBusState, g364.vram_size, 8 * MiB),
DEFINE_PROP_END_OF_LIST(),
};
static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = g364fb_sysbus_realize;
set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
dc->desc = "G364 framebuffer";
dc->reset = g364fb_sysbus_reset;
dc->vmsd = &vmstate_g364fb;
device_class_set_props(dc, g364fb_sysbus_properties);
}
static const TypeInfo g364fb_sysbus_info = {
.name = TYPE_G364,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(G364SysBusState),
.class_init = g364fb_sysbus_class_init,
};
static void g364fb_register_types(void)
{
type_register_static(&g364fb_sysbus_info);
}
type_init(g364fb_register_types)
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