/*
 * QEMU internal VGA defines.
 * 
 * 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.
 */
#define MSR_COLOR_EMULATION 0x01
#define MSR_PAGE_SELECT     0x20

#define ST01_V_RETRACE      0x08
#define ST01_DISP_ENABLE    0x01

/* bochs VBE support */
#define CONFIG_BOCHS_VBE

#define VBE_DISPI_MAX_XRES              1024
#define VBE_DISPI_MAX_YRES              768

#define VBE_DISPI_INDEX_ID              0x0
#define VBE_DISPI_INDEX_XRES            0x1
#define VBE_DISPI_INDEX_YRES            0x2
#define VBE_DISPI_INDEX_BPP             0x3
#define VBE_DISPI_INDEX_ENABLE          0x4
#define VBE_DISPI_INDEX_BANK            0x5
#define VBE_DISPI_INDEX_VIRT_WIDTH      0x6
#define VBE_DISPI_INDEX_VIRT_HEIGHT     0x7
#define VBE_DISPI_INDEX_X_OFFSET        0x8
#define VBE_DISPI_INDEX_Y_OFFSET        0x9
#define VBE_DISPI_INDEX_NB              0xa
      
#define VBE_DISPI_ID0                   0xB0C0
#define VBE_DISPI_ID1                   0xB0C1
#define VBE_DISPI_ID2                   0xB0C2
  
#define VBE_DISPI_DISABLED              0x00
#define VBE_DISPI_ENABLED               0x01
#define VBE_DISPI_LFB_ENABLED           0x40
#define VBE_DISPI_NOCLEARMEM            0x80
  
#define VBE_DISPI_LFB_PHYSICAL_ADDRESS  0xE0000000

typedef struct VGAState {
    uint8_t *vram_ptr;
    unsigned long vram_offset;
    unsigned int vram_size;
    uint32_t latch;
    uint8_t sr_index;
    uint8_t sr[256];
    uint8_t gr_index;
    uint8_t gr[256];
    uint8_t ar_index;
    uint8_t ar[21];
    int ar_flip_flop;
    uint8_t cr_index;
    uint8_t cr[256]; /* CRT registers */
    uint8_t msr; /* Misc Output Register */
    uint8_t fcr; /* Feature Control Register */
    uint8_t st00; /* status 0 */
    uint8_t st01; /* status 1 */
    uint8_t dac_state;
    uint8_t dac_sub_index;
    uint8_t dac_read_index;
    uint8_t dac_write_index;
    uint8_t dac_cache[3]; /* used when writing */
    uint8_t palette[768];
    int32_t bank_offset;
    int (*get_bpp)(struct VGAState *s);
    void (*get_offsets)(struct VGAState *s, 
                        uint32_t *pline_offset, 
                        uint32_t *pstart_addr);
#ifdef CONFIG_BOCHS_VBE
    uint16_t vbe_index;
    uint16_t vbe_regs[VBE_DISPI_INDEX_NB];
    uint32_t vbe_start_addr;
    uint32_t vbe_line_offset;
    uint32_t vbe_bank_mask;
#endif
    /* display refresh support */
    DisplayState *ds;
    uint32_t font_offsets[2];
    int graphic_mode;
    uint8_t shift_control;
    uint8_t double_scan;
    uint32_t line_offset;
    uint32_t line_compare;
    uint32_t start_addr;
    uint8_t last_cw, last_ch;
    uint32_t last_width, last_height; /* in chars or pixels */
    uint32_t last_scr_width, last_scr_height; /* in pixels */
    uint8_t cursor_start, cursor_end;
    uint32_t cursor_offset;
    unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned b);
    /* tell for each page if it has been updated since the last time */
    uint32_t last_palette[256];
#define CH_ATTR_SIZE (160 * 100)
    uint32_t last_ch_attr[CH_ATTR_SIZE]; /* XXX: make it dynamic */
} VGAState;

void vga_common_init(VGAState *s, DisplayState *ds, uint8_t *vga_ram_base, 
                     unsigned long vga_ram_offset, int vga_ram_size);
uint32_t vga_mem_readb(void *opaque, target_phys_addr_t addr);
void vga_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val);

extern const uint8_t sr_mask[8];
extern const uint8_t gr_mask[16];