Archipelago » qemu

/*

 * QEMU ISA MM VGA Emulator.

 *

 * Copyright (c) 2003 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 "hw.h"

#include "console.h"

#include "pc.h"

#include "vga_int.h"

#include "pixel_ops.h"

#include "qemu-timer.h"

#define VGA_RAM_SIZE (8192 * 1024)

typedef struct ISAVGAMMState {

    VGACommonState vga;

    int it_shift;

} ISAVGAMMState;

/* Memory mapped interface */

static uint32_t vga_mm_readb (void *opaque, hwaddr addr)

{

    ISAVGAMMState *s = opaque;

    return vga_ioport_read(&s->vga, addr >> s->it_shift) & 0xff;

}

static void vga_mm_writeb (void *opaque,

                           hwaddr addr, uint32_t value)

{

    ISAVGAMMState *s = opaque;

    vga_ioport_write(&s->vga, addr >> s->it_shift, value & 0xff);

}

static uint32_t vga_mm_readw (void *opaque, hwaddr addr)

{

    ISAVGAMMState *s = opaque;

    return vga_ioport_read(&s->vga, addr >> s->it_shift) & 0xffff;

}

static void vga_mm_writew (void *opaque,

                           hwaddr addr, uint32_t value)

{

    ISAVGAMMState *s = opaque;

    vga_ioport_write(&s->vga, addr >> s->it_shift, value & 0xffff);

}

static uint32_t vga_mm_readl (void *opaque, hwaddr addr)

{

    ISAVGAMMState *s = opaque;

    return vga_ioport_read(&s->vga, addr >> s->it_shift);

}

static void vga_mm_writel (void *opaque,

                           hwaddr addr, uint32_t value)

{

    ISAVGAMMState *s = opaque;

    vga_ioport_write(&s->vga, addr >> s->it_shift, value);

}

static const MemoryRegionOps vga_mm_ctrl_ops = {

    .old_mmio = {

        .read = {

            vga_mm_readb,

            vga_mm_readw,

            vga_mm_readl,

        },

        .write = {

            vga_mm_writeb,

            vga_mm_writew,

            vga_mm_writel,

        },

    },

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static void vga_mm_init(ISAVGAMMState *s, hwaddr vram_base,

                        hwaddr ctrl_base, int it_shift,

                        MemoryRegion *address_space)

{

    MemoryRegion *s_ioport_ctrl, *vga_io_memory;

    s->it_shift = it_shift;

    s_ioport_ctrl = g_malloc(sizeof(*s_ioport_ctrl));

    memory_region_init_io(s_ioport_ctrl, &vga_mm_ctrl_ops, s,

                          "vga-mm-ctrl", 0x100000);

    memory_region_set_flush_coalesced(s_ioport_ctrl);

    vga_io_memory = g_malloc(sizeof(*vga_io_memory));

    /* XXX: endianness? */

    memory_region_init_io(vga_io_memory, &vga_mem_ops, &s->vga,

                          "vga-mem", 0x20000);

    vmstate_register(NULL, 0, &vmstate_vga_common, s);

    memory_region_add_subregion(address_space, ctrl_base, s_ioport_ctrl);

    s->vga.bank_offset = 0;

    memory_region_add_subregion(address_space,

                                vram_base + 0x000a0000, vga_io_memory);

    memory_region_set_coalescing(vga_io_memory);

}

int isa_vga_mm_init(hwaddr vram_base,

                    hwaddr ctrl_base, int it_shift,

                    MemoryRegion *address_space)

{

    ISAVGAMMState *s;

    s = g_malloc0(sizeof(*s));

    s->vga.vram_size_mb = VGA_RAM_SIZE >> 20;

    vga_common_init(&s->vga);

    vga_mm_init(s, vram_base, ctrl_base, it_shift, address_space);

    s->vga.ds = graphic_console_init(s->vga.update, s->vga.invalidate,

                                     s->vga.screen_dump, s->vga.text_update, s);

    vga_init_vbe(&s->vga, address_space);

    return 0;

}