/*
 * QEMU Sun4m System Emulator
 * 
 * Copyright (c) 2003-2004 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 "vl.h"

#define PHYS_JJ_TCX_FB	0x50800000	/* Start address, frame buffer body */
#define PHYS_JJ_TCX_0E	0x5E000000	/* Top address, one byte used. */

#define MAXX 1024
#define MAXY 768
#define XSZ (8*80)
#define YSZ (24*11)
#define XOFF (MAXX-XSZ)
#define YOFF (MAXY-YSZ)

#define DEBUG_VGA_MEM

typedef struct TCXState {
    uint8_t *vram_ptr;
    unsigned long vram_offset;
    unsigned int vram_size;
    DisplayState *ds;
} TCXState;

static TCXState *ts;

static int tcx_io_memory;

void vga_update_display()
{
    dpy_update(ts->ds, 0, 0, XSZ, YSZ);
}

static uint32_t tcx_mem_readb(void *opaque, target_phys_addr_t addr)
{
    TCXState *s = opaque;
    uint32_t saddr;
    unsigned int x, y;
    char *sptr;

    saddr = addr - PHYS_JJ_TCX_FB - YOFF*MAXX - XOFF;
    y = saddr / MAXX;
    x = saddr - y * MAXX;
    if (x < MAXX && y < MAXY) {
	sptr = 	s->ds->data;
	if (sptr)
	    return sptr[y * s->ds->linesize + x*4];
    }
    return 0;
}

static uint32_t tcx_mem_readw(void *opaque, target_phys_addr_t addr)
{
    uint32_t v;
#ifdef TARGET_WORDS_BIGENDIAN
    v = tcx_mem_readb(opaque, addr) << 8;
    v |= tcx_mem_readb(opaque, addr + 1);
#else
    v = tcx_mem_readb(opaque, addr);
    v |= tcx_mem_readb(opaque, addr + 1) << 8;
#endif
    return v;
}

static uint32_t tcx_mem_readl(void *opaque, target_phys_addr_t addr)
{
    uint32_t v;
#ifdef TARGET_WORDS_BIGENDIAN
    v = tcx_mem_readb(opaque, addr) << 24;
    v |= tcx_mem_readb(opaque, addr + 1) << 16;
    v |= tcx_mem_readb(opaque, addr + 2) << 8;
    v |= tcx_mem_readb(opaque, addr + 3);
#else
    v = tcx_mem_readb(opaque, addr);
    v |= tcx_mem_readb(opaque, addr + 1) << 8;
    v |= tcx_mem_readb(opaque, addr + 2) << 16;
    v |= tcx_mem_readb(opaque, addr + 3) << 24;
#endif
    return v;
}

/* called for accesses between 0xa0000 and 0xc0000 */
static void tcx_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
{
    TCXState *s = opaque;
    uint32_t saddr;
    unsigned int x, y;
    char *sptr;

    saddr = addr - PHYS_JJ_TCX_FB - YOFF*MAXX - XOFF;
    y = saddr / MAXX;
    x = saddr - y * MAXX;
    if (x < MAXX && y < MAXY) {
	sptr = 	s->ds->data;
	if (sptr) {
	    sptr[y * s->ds->linesize + x*4] = val;
	    sptr[y * s->ds->linesize + x*4+1] = val;
	    sptr[y * s->ds->linesize + x*4+2] = val;
	    cpu_physical_memory_set_dirty(addr);
	}
    }
}

static void tcx_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
{
#ifdef TARGET_WORDS_BIGENDIAN
    tcx_mem_writeb(opaque, addr, (val >> 8) & 0xff);
    tcx_mem_writeb(opaque, addr + 1, val & 0xff);
#else
    tcx_mem_writeb(opaque, addr, val & 0xff);
    tcx_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
#endif
}

static void tcx_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
#ifdef TARGET_WORDS_BIGENDIAN
    tcx_mem_writeb(opaque, addr, (val >> 24) & 0xff);
    tcx_mem_writeb(opaque, addr + 1, (val >> 16) & 0xff);
    tcx_mem_writeb(opaque, addr + 2, (val >> 8) & 0xff);
    tcx_mem_writeb(opaque, addr + 3, val & 0xff);
#else
    tcx_mem_writeb(opaque, addr, val & 0xff);
    tcx_mem_writeb(opaque, addr + 1, (val >> 8) & 0xff);
    tcx_mem_writeb(opaque, addr + 2, (val >> 16) & 0xff);
    tcx_mem_writeb(opaque, addr + 3, (val >> 24) & 0xff);
#endif
}

static CPUReadMemoryFunc *tcx_mem_read[3] = {
    tcx_mem_readb,
    tcx_mem_readw,
    tcx_mem_readl,
};

static CPUWriteMemoryFunc *tcx_mem_write[3] = {
    tcx_mem_writeb,
    tcx_mem_writew,
    tcx_mem_writel,
};

void tcx_init(DisplayState *ds)
{
    TCXState *s;

    s = qemu_mallocz(sizeof(TCXState));
    if (!s)
        return;
    s->ds = ds;
    ts = s;
    tcx_io_memory = cpu_register_io_memory(0, tcx_mem_read, tcx_mem_write, s);
    cpu_register_physical_memory(PHYS_JJ_TCX_FB, 0x100000, 
                                 tcx_io_memory);
    dpy_resize(s->ds, XSZ, YSZ);
}