/*
 * 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.
 */

#include <hw/hw.h>

#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              1600
#define VBE_DISPI_MAX_YRES              1200
#define VBE_DISPI_MAX_BPP               32

#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 /* size of vbe_regs[] */
#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa /* read-only, not in vbe_regs */

#define VBE_DISPI_ID0                   0xB0C0
#define VBE_DISPI_ID1                   0xB0C1
#define VBE_DISPI_ID2                   0xB0C2
#define VBE_DISPI_ID3                   0xB0C3
#define VBE_DISPI_ID4                   0xB0C4
#define VBE_DISPI_ID5                   0xB0C5

#define VBE_DISPI_DISABLED              0x00
#define VBE_DISPI_ENABLED               0x01
#define VBE_DISPI_GETCAPS               0x02
#define VBE_DISPI_8BIT_DAC              0x20
#define VBE_DISPI_LFB_ENABLED           0x40
#define VBE_DISPI_NOCLEARMEM            0x80

#define VBE_DISPI_LFB_PHYSICAL_ADDRESS  0xE0000000

#ifdef CONFIG_BOCHS_VBE

#define VGA_STATE_COMMON_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;			\
    int vbe_mapped;
#else

#define VGA_STATE_COMMON_BOCHS_VBE

#endif /* !CONFIG_BOCHS_VBE */

#define CH_ATTR_SIZE (160 * 100)
#define VGA_MAX_HEIGHT 2048

struct vga_precise_retrace {
    int64_t ticks_per_char;
    int64_t total_chars;
    int htotal;
    int hstart;
    int hend;
    int vstart;
    int vend;
    int freq;
};

union vga_retrace {
    struct vga_precise_retrace precise;
};

struct VGACommonState;
typedef uint8_t (* vga_retrace_fn)(struct VGACommonState *s);
typedef void (* vga_update_retrace_info_fn)(struct VGACommonState *s);

typedef struct VGACommonState {
    uint8_t *vram_ptr;
    ram_addr_t vram_offset;
    target_phys_addr_t lfb_addr;
    target_phys_addr_t lfb_end;
    target_phys_addr_t map_addr;
    target_phys_addr_t map_end;
    uint32_t vram_size;
    uint32_t latch;
    uint32_t lfb_vram_mapped; /* whether 0xa0000 is mapped as ram */
    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 */
    int dac_8bit;
    uint8_t palette[768];
    int32_t bank_offset;
    int vga_io_memory;
    int (*get_bpp)(struct VGACommonState *s);
    void (*get_offsets)(struct VGACommonState *s,
                        uint32_t *pline_offset,
                        uint32_t *pstart_addr,
                        uint32_t *pline_compare);
    void (*get_resolution)(struct VGACommonState *s,
                        int *pwidth,
                        int *pheight);
    VGA_STATE_COMMON_BOCHS_VBE
    /* 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;
    uint32_t plane_updated;
    uint32_t last_line_offset;
    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 */
    uint32_t last_depth; /* in bits */
    uint8_t cursor_start, cursor_end;
    uint32_t cursor_offset;
    unsigned int (*rgb_to_pixel)(unsigned int r,
                                 unsigned int g, unsigned b);
    vga_hw_update_ptr update;
    vga_hw_invalidate_ptr invalidate;
    vga_hw_screen_dump_ptr screen_dump;
    vga_hw_text_update_ptr text_update;
    /* hardware mouse cursor support */
    uint32_t invalidated_y_table[VGA_MAX_HEIGHT / 32];
    void (*cursor_invalidate)(struct VGACommonState *s);
    void (*cursor_draw_line)(struct VGACommonState *s, uint8_t *d, int y);
    /* tell for each page if it has been updated since the last time */
    uint32_t last_palette[256];
    uint32_t last_ch_attr[CH_ATTR_SIZE]; /* XXX: make it dynamic */
    /* retrace */
    vga_retrace_fn retrace;
    vga_update_retrace_info_fn update_retrace_info;
    union vga_retrace retrace_info;
    uint8_t is_vbe_vmstate;
} VGACommonState;

static inline int c6_to_8(int v)
{
    int b;
    v &= 0x3f;
    b = v & 1;
    return (v << 2) | (b << 1) | b;
}

void vga_common_init(VGACommonState *s, int vga_ram_size);
void vga_init(VGACommonState *s);
int vga_init_io(VGACommonState *s);
void vga_common_reset(VGACommonState *s);

void vga_dirty_log_start(VGACommonState *s);
void vga_dirty_log_stop(VGACommonState *s);
void vga_dirty_log_restart(VGACommonState *s);

extern const VMStateDescription vmstate_vga_common;
uint32_t vga_ioport_read(void *opaque, uint32_t addr);
void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val);
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);
void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2);
int ppm_save(const char *filename, struct DisplaySurface *ds);

void vga_draw_cursor_line_8(uint8_t *d1, const uint8_t *src1,
                            int poffset, int w,
                            unsigned int color0, unsigned int color1,
                            unsigned int color_xor);
void vga_draw_cursor_line_16(uint8_t *d1, const uint8_t *src1,
                             int poffset, int w,
                             unsigned int color0, unsigned int color1,
                             unsigned int color_xor);
void vga_draw_cursor_line_32(uint8_t *d1, const uint8_t *src1,
                             int poffset, int w,
                             unsigned int color0, unsigned int color1,
                             unsigned int color_xor);

int vga_ioport_invalid(VGACommonState *s, uint32_t addr);
void vga_init_vbe(VGACommonState *s);

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

#define VGA_RAM_SIZE (8192 * 1024)
#define VGABIOS_FILENAME "vgabios.bin"
#define VGABIOS_CIRRUS_FILENAME "vgabios-cirrus.bin"

extern CPUReadMemoryFunc * const vga_mem_read[3];
extern CPUWriteMemoryFunc * const vga_mem_write[3];