Archipelago » qemu

/*

 * QEMU TCX Frame buffer

 *

 * Copyright (c) 2003-2005 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "ui/console.h"

#include "ui/pixel_ops.h"

#include "hw/sysbus.h"

#define MAXX 1024

#define MAXY 768

#define TCX_DAC_NREGS 16

#define TCX_THC_NREGS_8  0x081c

#define TCX_THC_NREGS_24 0x1000

#define TCX_TEC_NREGS    0x1000

typedef struct TCXState {

    SysBusDevice busdev;

    QemuConsole *con;

    uint8_t *vram;

    uint32_t *vram24, *cplane;

    MemoryRegion vram_mem;

    MemoryRegion vram_8bit;

    MemoryRegion vram_24bit;

    MemoryRegion vram_cplane;

    MemoryRegion dac;

    MemoryRegion tec;

    MemoryRegion thc24;

    MemoryRegion thc8;

    ram_addr_t vram24_offset, cplane_offset;

    uint32_t vram_size;

    uint32_t palette[256];

    uint8_t r[256], g[256], b[256];

    uint16_t width, height, depth;

    uint8_t dac_index, dac_state;

} TCXState;

static void tcx_set_dirty(TCXState *s)

{

    memory_region_set_dirty(&s->vram_mem, 0, MAXX * MAXY);

}

static void tcx24_set_dirty(TCXState *s)

{

    memory_region_set_dirty(&s->vram_mem, s->vram24_offset, MAXX * MAXY * 4);

    memory_region_set_dirty(&s->vram_mem, s->cplane_offset, MAXX * MAXY * 4);

}

static void update_palette_entries(TCXState *s, int start, int end)

{

    DisplaySurface *surface = qemu_console_surface(s->con);

    int i;

    for (i = start; i < end; i++) {

        switch (surface_bits_per_pixel(surface)) {

        default:

        case 8:

            s->palette[i] = rgb_to_pixel8(s->r[i], s->g[i], s->b[i]);

            break;

        case 15:

            s->palette[i] = rgb_to_pixel15(s->r[i], s->g[i], s->b[i]);

            break;

        case 16:

            s->palette[i] = rgb_to_pixel16(s->r[i], s->g[i], s->b[i]);

            break;

        case 32:

            if (is_surface_bgr(surface)) {

                s->palette[i] = rgb_to_pixel32bgr(s->r[i], s->g[i], s->b[i]);

            } else {

                s->palette[i] = rgb_to_pixel32(s->r[i], s->g[i], s->b[i]);

            }

            break;

        }

    }

    if (s->depth == 24) {

        tcx24_set_dirty(s);

    } else {

        tcx_set_dirty(s);

    }

}

static void tcx_draw_line32(TCXState *s1, uint8_t *d,

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    uint32_t *p = (uint32_t *)d;

    for(x = 0; x < width; x++) {

        val = *s++;

        *p++ = s1->palette[val];

    }

}

static void tcx_draw_line16(TCXState *s1, uint8_t *d,

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    uint16_t *p = (uint16_t *)d;

    for(x = 0; x < width; x++) {

        val = *s++;

        *p++ = s1->palette[val];

    }

}

static void tcx_draw_line8(TCXState *s1, uint8_t *d,

                           const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    for(x = 0; x < width; x++) {

        val = *s++;

        *d++ = s1->palette[val];

    }

}

/*

  XXX Could be much more optimal:

  * detect if line/page/whole screen is in 24 bit mode

  * if destination is also BGR, use memcpy

  */

static inline void tcx24_draw_line32(TCXState *s1, uint8_t *d,

                                     const uint8_t *s, int width,

                                     const uint32_t *cplane,

                                     const uint32_t *s24)

{

    DisplaySurface *surface = qemu_console_surface(s1->con);

    int x, bgr, r, g, b;

    uint8_t val, *p8;

    uint32_t *p = (uint32_t *)d;

    uint32_t dval;

    bgr = is_surface_bgr(surface);

    for(x = 0; x < width; x++, s++, s24++) {

        if ((be32_to_cpu(*cplane++) & 0xff000000) == 0x03000000) {

            // 24-bit direct, BGR order

            p8 = (uint8_t *)s24;

            p8++;

            b = *p8++;

            g = *p8++;

            r = *p8;

            if (bgr)

                dval = rgb_to_pixel32bgr(r, g, b);

            else

                dval = rgb_to_pixel32(r, g, b);

        } else {

            val = *s;

            dval = s1->palette[val];

        }

        *p++ = dval;

    }

}

static inline int check_dirty(TCXState *s, ram_addr_t page, ram_addr_t page24,

                              ram_addr_t cpage)

{

    int ret;

    ret = memory_region_get_dirty(&s->vram_mem, page, TARGET_PAGE_SIZE,

                                  DIRTY_MEMORY_VGA);

    ret |= memory_region_get_dirty(&s->vram_mem, page24, TARGET_PAGE_SIZE * 4,

                                   DIRTY_MEMORY_VGA);

    ret |= memory_region_get_dirty(&s->vram_mem, cpage, TARGET_PAGE_SIZE * 4,

                                   DIRTY_MEMORY_VGA);

    return ret;

}

static inline void reset_dirty(TCXState *ts, ram_addr_t page_min,

                               ram_addr_t page_max, ram_addr_t page24,

                              ram_addr_t cpage)

{

    memory_region_reset_dirty(&ts->vram_mem,

                              page_min,

                              (page_max - page_min) + TARGET_PAGE_SIZE,

                              DIRTY_MEMORY_VGA);

    memory_region_reset_dirty(&ts->vram_mem,

                              page24 + page_min * 4,

                              (page_max - page_min) * 4 + TARGET_PAGE_SIZE,

                              DIRTY_MEMORY_VGA);

    memory_region_reset_dirty(&ts->vram_mem,

                              cpage + page_min * 4,

                              (page_max - page_min) * 4 + TARGET_PAGE_SIZE,

                              DIRTY_MEMORY_VGA);

}

/* Fixed line length 1024 allows us to do nice tricks not possible on

   VGA... */

static void tcx_update_display(void *opaque)

{

    TCXState *ts = opaque;

    DisplaySurface *surface = qemu_console_surface(ts->con);

    ram_addr_t page, page_min, page_max;

    int y, y_start, dd, ds;

    uint8_t *d, *s;

    void (*f)(TCXState *s1, uint8_t *dst, const uint8_t *src, int width);

    if (surface_bits_per_pixel(surface) == 0) {

        return;

    }

    page = 0;

    y_start = -1;

    page_min = -1;

    page_max = 0;

    d = surface_data(surface);

    s = ts->vram;

    dd = surface_stride(surface);

    ds = 1024;

    switch (surface_bits_per_pixel(surface)) {

    case 32:

        f = tcx_draw_line32;

        break;

    case 15:

    case 16:

        f = tcx_draw_line16;

        break;

    default:

    case 8:

        f = tcx_draw_line8;

        break;

    case 0:

        return;

    }

    for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE) {

        if (memory_region_get_dirty(&ts->vram_mem, page, TARGET_PAGE_SIZE,

                                    DIRTY_MEMORY_VGA)) {

            if (y_start < 0)

                y_start = y;

            if (page < page_min)

                page_min = page;

            if (page > page_max)

                page_max = page;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

        } else {

            if (y_start >= 0) {

                /* flush to display */

                dpy_gfx_update(ts->con, 0, y_start,

                               ts->width, y - y_start);

                y_start = -1;

            }

            d += dd * 4;

            s += ds * 4;

        }

    }

    if (y_start >= 0) {

        /* flush to display */

        dpy_gfx_update(ts->con, 0, y_start,

                       ts->width, y - y_start);

    }

    /* reset modified pages */

    if (page_max >= page_min) {

        memory_region_reset_dirty(&ts->vram_mem,

                                  page_min,

                                  (page_max - page_min) + TARGET_PAGE_SIZE,

                                  DIRTY_MEMORY_VGA);

    }

}

static void tcx24_update_display(void *opaque)

{

    TCXState *ts = opaque;

    DisplaySurface *surface = qemu_console_surface(ts->con);

    ram_addr_t page, page_min, page_max, cpage, page24;

    int y, y_start, dd, ds;

    uint8_t *d, *s;

    uint32_t *cptr, *s24;

    if (surface_bits_per_pixel(surface) != 32) {

            return;

    }

    page = 0;

    page24 = ts->vram24_offset;

    cpage = ts->cplane_offset;

    y_start = -1;

    page_min = -1;

    page_max = 0;

    d = surface_data(surface);

    s = ts->vram;

    s24 = ts->vram24;

    cptr = ts->cplane;

    dd = surface_stride(surface);

    ds = 1024;

    for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE,

            page24 += TARGET_PAGE_SIZE, cpage += TARGET_PAGE_SIZE) {

        if (check_dirty(ts, page, page24, cpage)) {

            if (y_start < 0)

                y_start = y;

            if (page < page_min)

                page_min = page;

            if (page > page_max)

                page_max = page;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

            tcx24_draw_line32(ts, d, s, ts->width, cptr, s24);

            d += dd;

            s += ds;

            cptr += ds;

            s24 += ds;

        } else {

            if (y_start >= 0) {

                /* flush to display */

                dpy_gfx_update(ts->con, 0, y_start,

                               ts->width, y - y_start);

                y_start = -1;

            }

            d += dd * 4;

            s += ds * 4;

            cptr += ds * 4;

            s24 += ds * 4;

        }

    }

    if (y_start >= 0) {

        /* flush to display */

        dpy_gfx_update(ts->con, 0, y_start,

                       ts->width, y - y_start);

    }

    /* reset modified pages */

    if (page_max >= page_min) {

        reset_dirty(ts, page_min, page_max, page24, cpage);

    }

}

static void tcx_invalidate_display(void *opaque)

{

    TCXState *s = opaque;

    tcx_set_dirty(s);

    qemu_console_resize(s->con, s->width, s->height);

}

static void tcx24_invalidate_display(void *opaque)

{

    TCXState *s = opaque;

    tcx_set_dirty(s);

    tcx24_set_dirty(s);

    qemu_console_resize(s->con, s->width, s->height);

}

static int vmstate_tcx_post_load(void *opaque, int version_id)

{

    TCXState *s = opaque;

    update_palette_entries(s, 0, 256);

    if (s->depth == 24) {

        tcx24_set_dirty(s);

    } else {

        tcx_set_dirty(s);

    }

    return 0;

}

static const VMStateDescription vmstate_tcx = {

    .name ="tcx",

    .version_id = 4,

    .minimum_version_id = 4,

    .minimum_version_id_old = 4,

    .post_load = vmstate_tcx_post_load,

    .fields      = (VMStateField []) {

        VMSTATE_UINT16(height, TCXState),

        VMSTATE_UINT16(width, TCXState),

        VMSTATE_UINT16(depth, TCXState),

        VMSTATE_BUFFER(r, TCXState),

        VMSTATE_BUFFER(g, TCXState),

        VMSTATE_BUFFER(b, TCXState),

        VMSTATE_UINT8(dac_index, TCXState),

        VMSTATE_UINT8(dac_state, TCXState),

        VMSTATE_END_OF_LIST()

    }

};

static void tcx_reset(DeviceState *d)

{

    TCXState *s = container_of(d, TCXState, busdev.qdev);

    /* Initialize palette */

    memset(s->r, 0, 256);

    memset(s->g, 0, 256);

    memset(s->b, 0, 256);

    s->r[255] = s->g[255] = s->b[255] = 255;

    update_palette_entries(s, 0, 256);

    memset(s->vram, 0, MAXX*MAXY);

    memory_region_reset_dirty(&s->vram_mem, 0, MAXX * MAXY * (1 + 4 + 4),

                              DIRTY_MEMORY_VGA);

    s->dac_index = 0;

    s->dac_state = 0;

}

static uint64_t tcx_dac_readl(void *opaque, hwaddr addr,

                              unsigned size)

{

    return 0;

}

static void tcx_dac_writel(void *opaque, hwaddr addr, uint64_t val,

                           unsigned size)

{

    TCXState *s = opaque;

    switch (addr) {

    case 0:

        s->dac_index = val >> 24;

        s->dac_state = 0;

        break;

    case 4:

        switch (s->dac_state) {

        case 0:

            s->r[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_state++;

            break;

        case 1:

            s->g[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_state++;

            break;

        case 2:

            s->b[s->dac_index] = val >> 24;

            update_palette_entries(s, s->dac_index, s->dac_index + 1);

            s->dac_index = (s->dac_index + 1) & 255; // Index autoincrement

        default:

            s->dac_state = 0;

            break;

        }

        break;

    default:

        break;

    }

}

static const MemoryRegionOps tcx_dac_ops = {

    .read = tcx_dac_readl,

    .write = tcx_dac_writel,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static uint64_t dummy_readl(void *opaque, hwaddr addr,

                            unsigned size)

{

    return 0;

}

static void dummy_writel(void *opaque, hwaddr addr,

                         uint64_t val, unsigned size)

{

}

static const MemoryRegionOps dummy_ops = {

    .read = dummy_readl,

    .write = dummy_writel,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static const GraphicHwOps tcx_ops = {

    .invalidate = tcx_invalidate_display,

    .gfx_update = tcx_update_display,

};

static const GraphicHwOps tcx24_ops = {

    .invalidate = tcx24_invalidate_display,

    .gfx_update = tcx24_update_display,

};

static int tcx_init1(SysBusDevice *dev)

{

    TCXState *s = FROM_SYSBUS(TCXState, dev);

    ram_addr_t vram_offset = 0;

    int size;

    uint8_t *vram_base;

    memory_region_init_ram(&s->vram_mem, NULL, "tcx.vram",

                           s->vram_size * (1 + 4 + 4));

    vmstate_register_ram_global(&s->vram_mem);

    vram_base = memory_region_get_ram_ptr(&s->vram_mem);

    /* 8-bit plane */

    s->vram = vram_base;

    size = s->vram_size;

    memory_region_init_alias(&s->vram_8bit, NULL, "tcx.vram.8bit",

                             &s->vram_mem, vram_offset, size);

    sysbus_init_mmio(dev, &s->vram_8bit);

    vram_offset += size;

    vram_base += size;

    /* DAC */

    memory_region_init_io(&s->dac, NULL, &tcx_dac_ops, s, "tcx.dac", TCX_DAC_NREGS);

    sysbus_init_mmio(dev, &s->dac);

    /* TEC (dummy) */

    memory_region_init_io(&s->tec, NULL, &dummy_ops, s, "tcx.tec", TCX_TEC_NREGS);

    sysbus_init_mmio(dev, &s->tec);

    /* THC: NetBSD writes here even with 8-bit display: dummy */

    memory_region_init_io(&s->thc24, NULL, &dummy_ops, s, "tcx.thc24",

                          TCX_THC_NREGS_24);

    sysbus_init_mmio(dev, &s->thc24);

    if (s->depth == 24) {

        /* 24-bit plane */

        size = s->vram_size * 4;

        s->vram24 = (uint32_t *)vram_base;

        s->vram24_offset = vram_offset;

        memory_region_init_alias(&s->vram_24bit, NULL, "tcx.vram.24bit",

                                 &s->vram_mem, vram_offset, size);

        sysbus_init_mmio(dev, &s->vram_24bit);

        vram_offset += size;

        vram_base += size;

        /* Control plane */

        size = s->vram_size * 4;

        s->cplane = (uint32_t *)vram_base;

        s->cplane_offset = vram_offset;

        memory_region_init_alias(&s->vram_cplane, NULL, "tcx.vram.cplane",

                                 &s->vram_mem, vram_offset, size);

        sysbus_init_mmio(dev, &s->vram_cplane);

        s->con = graphic_console_init(DEVICE(dev), &tcx24_ops, s);

    } else {

        /* THC 8 bit (dummy) */

        memory_region_init_io(&s->thc8, NULL, &dummy_ops, s, "tcx.thc8",

                              TCX_THC_NREGS_8);

        sysbus_init_mmio(dev, &s->thc8);

        s->con = graphic_console_init(DEVICE(dev), &tcx_ops, s);

    }

    qemu_console_resize(s->con, s->width, s->height);

    return 0;

}

static Property tcx_properties[] = {

    DEFINE_PROP_HEX32("vram_size", TCXState, vram_size, -1),

    DEFINE_PROP_UINT16("width",    TCXState, width,     -1),

    DEFINE_PROP_UINT16("height",   TCXState, height,    -1),

    DEFINE_PROP_UINT16("depth",    TCXState, depth,     -1),

    DEFINE_PROP_END_OF_LIST(),

};

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

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = tcx_init1;

    dc->reset = tcx_reset;

    dc->vmsd = &vmstate_tcx;

    dc->props = tcx_properties;

}

static const TypeInfo tcx_info = {

    .name          = "SUNW,tcx",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(TCXState),

    .class_init    = tcx_class_init,

};

static void tcx_register_types(void)

{

    type_register_static(&tcx_info);

}

type_init(tcx_register_types)