Archipelago » qemu

/*

 * QEMU G364 framebuffer Emulator.

 *

 * Copyright (c) 2007-2009 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, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include "hw.h"

#include "mips.h"

#include "console.h"

#include "pixel_ops.h"

//#define DEBUG_G364

#ifdef DEBUG_G364

#define DPRINTF(fmt, args...) \

do { printf("g364: " fmt , ##args); } while (0)

#else

#define DPRINTF(fmt, args...) do {} while (0)

#endif

#define BADF(fmt, args...) \

do { fprintf(stderr, "g364 ERROR: " fmt , ##args);} while (0)

typedef struct G364State {

    /* hardware */

    uint8_t *vram;

    ram_addr_t vram_offset;

    int vram_size;

    qemu_irq irq;

    /* 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_ID       0x000000

#define REG_BOOT     0x080000

#define REG_DISPLAY  0x080118

#define REG_VDISPLAY 0x080150

#define REG_CTLA     0x080300

#define REG_TOP      0x080400

#define REG_CURS_PAL 0x080508

#define REG_CURS_POS 0x080638

#define REG_CLR_PAL  0x080800

#define REG_CURS_PAT 0x081000

#define REG_RESET    0x180000

#define CTLA_FORCE_BLANK 0x00000400

#define CTLA_NO_CURSOR   0x00800000

static inline int check_dirty(ram_addr_t page)

{

    return cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG);

}

static inline void reset_dirty(G364State *s,

                               ram_addr_t page_min, ram_addr_t page_max)

{

    cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE - 1,

                                    VGA_DIRTY_FLAG);

}

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:

            BADF("unknown host depth %d\n", ds_get_bits_per_pixel(s->ds));

            return;

    }

    page = s->vram_offset;

    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(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 < TARGET_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 += TARGET_PAGE_SIZE;

            dy = x / s->width;

            x = x % s->width;

            y += dy;

            vram += TARGET_PAGE_SIZE;

            data_display += dy * ds_get_linesize(s->ds);

            dd = data_display + x * w;

        }

        page += TARGET_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;

    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 {

        BADF("unknown guest depth %d\n", s->depth);

    }

    qemu_irq_raise(s->irq);

}

static void inline g364fb_invalidate_display(void *opaque)

{

    G364State *s = opaque;

    int i;

    s->blanked = 0;

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

        cpu_physical_memory_set_dirty(s->vram_offset + i);

    }

}

static void g364fb_reset(void *opaque)

{

    G364State *s = opaque;

    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(opaque);

}

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;

    if (s->depth != 8) {

        BADF("unknown guest depth %d\n", 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 uint32_t g364fb_ctrl_readl(void *opaque, target_phys_addr_t addr)

{

    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_ID:

                val = 0x10; /* Mips G364 */

                break;

            case REG_DISPLAY:

                val = s->width / 4;

                break;

            case REG_VDISPLAY:

                val = s->height * 2;

                break;

            case REG_CTLA:

                val = s->ctla;

                break;

            default:

            {

                BADF("invalid read at [" TARGET_FMT_plx "]\n", addr);

                val = 0;

                break;

            }

        }

    }

    DPRINTF("read 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);

    return val;

}

static uint32_t g364fb_ctrl_readw(void *opaque, target_phys_addr_t addr)

{

    uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);

    if (addr & 0x2)

        return v >> 16;

    else

        return v & 0xffff;

}

static uint32_t g364fb_ctrl_readb(void *opaque, target_phys_addr_t addr)

{

    uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);

    return (v >> (8 * (addr & 0x3))) & 0xff;

}

static void g364fb_update_depth(G364State *s)

{

    const static 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, i;

    /* 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);

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

        cpu_physical_memory_set_dirty(s->vram_offset + i);

    }

}

static void g364fb_ctrl_writel(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    G364State *s = opaque;

    DPRINTF("write 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);

    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_ID: /* Card identifier; read-only */

            case REG_BOOT: /* Boot timing */

            case 0x80108: /* Line timing: half sync */

            case 0x80110: /* Line timing: back porch */

            case 0x80120: /* Line timing: short display */

            case 0x80128: /* Frame timing: broad pulse */

            case 0x80130: /* Frame timing: v sync */

            case 0x80138: /* Frame timing: v preequalise */

            case 0x80140: /* Frame timing: v postequalise */

            case 0x80148: /* Frame timing: v blank */

            case 0x80158: /* Line timing: line time */

            case 0x80160: /* Frame store: line start */

            case 0x80168: /* vram cycle: mem init */

            case 0x80170: /* vram cycle: transfer delay */

            case 0x80200: /* 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:

                BADF("invalid write of 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);

                break;

        }

    }

    qemu_irq_lower(s->irq);

}

static void g364fb_ctrl_writew(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);

    if (addr & 0x2)

        val = (val << 16) | (old_val & 0x0000ffff);

    else

        val = val | (old_val & 0xffff0000);

    g364fb_ctrl_writel(opaque, addr & ~0x3, val);

}

static void g364fb_ctrl_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);

    switch (addr & 3) {

    case 0:

        val = val | (old_val & 0xffffff00);

        break;

    case 1:

        val = (val << 8) | (old_val & 0xffff00ff);

        break;

    case 2:

        val = (val << 16) | (old_val & 0xff00ffff);

        break;

    case 3:

        val = (val << 24) | (old_val & 0x00ffffff);

        break;

    }

    g364fb_ctrl_writel(opaque, addr & ~0x3, val);

}

static CPUReadMemoryFunc *g364fb_ctrl_read[3] = {

    g364fb_ctrl_readb,

    g364fb_ctrl_readw,

    g364fb_ctrl_readl,

};

static CPUWriteMemoryFunc *g364fb_ctrl_write[3] = {

    g364fb_ctrl_writeb,

    g364fb_ctrl_writew,

    g364fb_ctrl_writel,

};

static int g364fb_load(QEMUFile *f, void *opaque, int version_id)

{

    G364State *s = opaque;

    unsigned int i, vram_size;

    if (version_id != 1)

        return -EINVAL;

    vram_size = qemu_get_be32(f);

    if (vram_size < s->vram_size)

        return -EINVAL;

    qemu_get_buffer(f, s->vram, s->vram_size);

    for (i = 0; i < 256; i++)

        qemu_get_buffer(f, s->color_palette[i], 3);

    for (i = 0; i < 3; i++)

        qemu_get_buffer(f, s->cursor_palette[i], 3);

    qemu_get_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));

    s->cursor_position = qemu_get_be32(f);

    s->ctla = qemu_get_be32(f);

    s->top_of_screen = qemu_get_be32(f);

    s->width = qemu_get_be32(f);

    s->height = qemu_get_be32(f);

    /* force refresh */

    g364fb_update_depth(s);

    g364fb_invalidate_display(s);

    return 0;

}

static void g364fb_save(QEMUFile *f, void *opaque)

{

    G364State *s = opaque;

    int i;

    qemu_put_be32(f, s->vram_size);

    qemu_put_buffer(f, s->vram, s->vram_size);

    for (i = 0; i < 256; i++)

        qemu_put_buffer(f, s->color_palette[i], 3);

    for (i = 0; i < 3; i++)

        qemu_put_buffer(f, s->cursor_palette[i], 3);

    qemu_put_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));

    qemu_put_be32(f, s->cursor_position);

    qemu_put_be32(f, s->ctla);

    qemu_put_be32(f, s->top_of_screen);

    qemu_put_be32(f, s->width);

    qemu_put_be32(f, s->height);

}

int g364fb_mm_init(int vram_size, target_phys_addr_t vram_base,

                   target_phys_addr_t ctrl_base, int it_shift,

                   qemu_irq irq)

{

    G364State *s;

    int io_ctrl;

    s = qemu_mallocz(sizeof(G364State));

    s->vram_offset = qemu_ram_alloc(vram_size);

    s->vram = qemu_get_ram_ptr(s->vram_offset);

    s->vram_size = vram_size;

    s->irq = irq;

    qemu_register_reset(g364fb_reset, s);

    register_savevm("g364fb", 0, 1, g364fb_save, g364fb_load, s);

    g364fb_reset(s);

    s->ds = graphic_console_init(g364fb_update_display,

                                 g364fb_invalidate_display,

                                 g364fb_screen_dump, NULL, s);

    cpu_register_physical_memory(vram_base, s->vram_size, s->vram_offset);

    io_ctrl = cpu_register_io_memory(0, g364fb_ctrl_read, g364fb_ctrl_write, s);

    cpu_register_physical_memory(ctrl_base, 0x200000, io_ctrl);

    return 0;

}