Archipelago » qemu

/*

 * 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 "hw.h"

#include "console.h"

#include "pixel_ops.h"

#include "trace.h"

#include "sysbus.h"

typedef struct G364State {

    /* hardware */

    uint8_t *vram;

    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 */

    DisplayState *ds;

    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, ram_addr_t page)

{

    return memory_region_get_dirty(&s->mem_vram, page, G364_PAGE_SIZE,

                                   DIRTY_MEMORY_VGA);

}

static inline void reset_dirty(G364State *s,

                               ram_addr_t page_min, ram_addr_t page_max)

{

    memory_region_reset_dirty(&s->mem_vram,

                              page_min,

                              page_max + G364_PAGE_SIZE - page_min - 1,

                              DIRTY_MEMORY_VGA);

}

static void g364fb_draw_graphic8(G364State *s)

{

    int i, w;

    uint8_t *vram;

    uint8_t *data_display, *dd;

    ram_addr_t page, page_min, page_max;

    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 (ds_get_bits_per_pixel(s->ds)) {

        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",

                     ds_get_bits_per_pixel(s->ds));

            return;

    }

    page = 0;

    page_min = (ram_addr_t)-1;

    page_max = 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 = s->vram + s->top_of_screen;

    /* XXX: out of range in vram? */

    data_display = dd = ds_get_data(s->ds);

    while (y < s->height) {

        if (check_dirty(s, page)) {

            if (y < ymin)

                ymin = ymax = y;

            if (page_min == (ram_addr_t)-1)

                page_min = page;

            page_max = page;

            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 + ds_get_linesize(s->ds);

                    xmin = 0;

                    x = 0;

                }

            }

            if (x > xmax)

                xmax = x;

            if (y > ymax)

                ymax = y;

        } else {

            int dy;

            if (page_min != (ram_addr_t)-1) {

                reset_dirty(s, page_min, page_max);

                page_min = (ram_addr_t)-1;

                page_max = 0;

                dpy_update(s->ds, 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 * ds_get_linesize(s->ds);

            dd = data_display + x * w;

        }

        page += G364_PAGE_SIZE;

    }

done:

    if (page_min != (ram_addr_t)-1) {

        dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);

        reset_dirty(s, page_min, page_max);

    }

}

static void g364fb_draw_blank(G364State *s)

{

    int i, w;

    uint8_t *d;

    if (s->blanked) {

        /* Screen is already blank. No need to redraw it */

        return;

    }

    w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);

    d = ds_get_data(s->ds);

    for (i = 0; i < s->height; i++) {

        memset(d, 0, w);

        d += ds_get_linesize(s->ds);

    }

    dpy_update(s->ds, 0, 0, s->width, s->height);

    s->blanked = 1;

}

static void g364fb_update_display(void *opaque)

{

    G364State *s = opaque;

    qemu_flush_coalesced_mmio_buffer();

    if (s->width == 0 || s->height == 0)

        return;

    if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {

        qemu_console_resize(s->ds, 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)

{

    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(s->vram, 0, s->vram_size);

    g364fb_invalidate_display(s);

}

static void g364fb_screen_dump(void *opaque, const char *filename)

{

    G364State *s = opaque;

    int y, x;

    uint8_t index;

    uint8_t *data_buffer;

    FILE *f;

    qemu_flush_coalesced_mmio_buffer();

    if (s->depth != 8) {

        error_report("g364: unknown guest depth %d", s->depth);

        return;

    }

    f = fopen(filename, "wb");

    if (!f)

        return;

    if (s->ctla & CTLA_FORCE_BLANK) {

        /* blank screen */

        fprintf(f, "P4\n%d %d\n",

            s->width, s->height);

        for (y = 0; y < s->height; y++)

            for (x = 0; x < s->width; x++)

                fputc(0, f);

    } else {

        data_buffer = s->vram + s->top_of_screen;

        fprintf(f, "P6\n%d %d\n%d\n",

            s->width, s->height, 255);

        for (y = 0; y < s->height; y++)

            for (x = 0; x < s->width; x++, data_buffer++) {

                index = *data_buffer;

                fputc(s->color_palette[index][0], f);

                fputc(s->color_palette[index][1], f);

                fputc(s->color_palette[index][2], f);

        }

    }

    fclose(f);

}

/* called for accesses to io ports */

static uint64_t g364fb_ctrl_read(void *opaque,

                                 target_phys_addr_t 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)

{

    int ymin, ymax, start, end;

    /* invalidate only near the cursor */

    ymin = s->cursor_position & 0xfff;

    ymax = MIN(s->height, ymin + 64);

    start = ymin * ds_get_linesize(s->ds);

    end = (ymax + 1) * ds_get_linesize(s->ds);

    memory_region_set_dirty(&s->mem_vram, start, end - start);

}

static void g364fb_ctrl_write(void *opaque,

                              target_phys_addr_t 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 = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .post_load = g364fb_post_load,

    .fields = (VMStateField[]) {

        VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),

        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 void g364fb_init(DeviceState *dev, G364State *s)

{

    s->vram = g_malloc0(s->vram_size);

    s->ds = graphic_console_init(g364fb_update_display,

                                 g364fb_invalidate_display,

                                 g364fb_screen_dump, NULL, s);

    memory_region_init_io(&s->mem_ctrl, &g364fb_ctrl_ops, s, "ctrl", 0x180000);

    memory_region_init_ram_ptr(&s->mem_vram, "vram",

                               s->vram_size, s->vram);

    vmstate_register_ram(&s->mem_vram, dev);

    memory_region_set_coalescing(&s->mem_vram);

}

typedef struct {

    SysBusDevice busdev;

    G364State g364;

} G364SysBusState;

static int g364fb_sysbus_init(SysBusDevice *dev)

{

    G364State *s = &FROM_SYSBUS(G364SysBusState, dev)->g364;

    g364fb_init(&dev->qdev, s);

    sysbus_init_irq(dev, &s->irq);

    sysbus_init_mmio(dev, &s->mem_ctrl);

    sysbus_init_mmio(dev, &s->mem_vram);

    return 0;

}

static void g364fb_sysbus_reset(DeviceState *d)

{

    G364SysBusState *s = DO_UPCAST(G364SysBusState, busdev.qdev, d);

    g364fb_reset(&s->g364);

}

static Property g364fb_sysbus_properties[] = {

    DEFINE_PROP_HEX32("vram_size", G364SysBusState, g364.vram_size,

    8 * 1024 * 1024),

    DEFINE_PROP_END_OF_LIST(),

};

static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = g364fb_sysbus_init;

    dc->desc = "G364 framebuffer";

    dc->reset = g364fb_sysbus_reset;

    dc->vmsd = &vmstate_g364fb;

    dc->props = g364fb_sysbus_properties;

}

static TypeInfo g364fb_sysbus_info = {

    .name          = "sysbus-g364",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(G364SysBusState),

    .class_init    = g364fb_sysbus_class_init,

};

static void g364fb_register(void)

{

    type_register_static(&g364fb_sysbus_info);

}

device_init(g364fb_register);