/*-
 * Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Default mode for VESA frame buffer.
 * This mode is selected when there is no EDID inormation and
 * mode is not provided by user.
 * To provide consistent look with UEFI GOP, we use 800x600 here,
 * and if this mode is not available, we fall back to text mode and
 * VESA disabled.
 */

#define VBE_DEFAULT_MODE        "800x600"

struct vbeinfoblock {
        char VbeSignature[4];
        uint16_t VbeVersion;
        uint32_t OemStringPtr;
        uint32_t Capabilities;
#define VBE_CAP_DAC8    (1 << 0)        /* Can switch DAC */
#define VBE_CAP_NONVGA  (1 << 1)        /* Controller is not VGA comp. */
#define VBE_CAP_SNOW    (1 << 2)        /* Set data during Vertical Reterace */
        uint32_t VideoModePtr;
        uint16_t TotalMemory;
        uint16_t OemSoftwareRev;
        uint32_t OemVendorNamePtr, OemProductNamePtr, OemProductRevPtr;
        /* data area, in total max 512 bytes for VBE 2.0 */
        uint8_t Reserved[222];
        uint8_t OemData[256];
} __packed;

struct modeinfoblock {
        /* Mandatory information for all VBE revisions */
        uint16_t ModeAttributes;
        uint8_t WinAAttributes, WinBAttributes;
        uint16_t WinGranularity, WinSize, WinASegment, WinBSegment;
        uint32_t WinFuncPtr;
        uint16_t BytesPerScanLine;
        /* Mandatory information for VBE 1.2 and above */
        uint16_t XResolution, YResolution;
        uint8_t XCharSize, YCharSize, NumberOfPlanes, BitsPerPixel;
        uint8_t NumberOfBanks, MemoryModel, BankSize, NumberOfImagePages;
        uint8_t Reserved1;
        /* Direct Color fields
           (required for direct/6 and YUV/7 memory models) */
        uint8_t RedMaskSize, RedFieldPosition;
        uint8_t GreenMaskSize, GreenFieldPosition;
        uint8_t BlueMaskSize, BlueFieldPosition;
        uint8_t RsvdMaskSize, RsvdFieldPosition;
        uint8_t DirectColorModeInfo;
        /* Mandatory information for VBE 2.0 and above */
        uint32_t PhysBasePtr;
        uint32_t OffScreenMemOffset;    /* reserved in VBE 3.0 and above */
        uint16_t OffScreenMemSize;      /* reserved in VBE 3.0 and above */

        /* Mandatory information for VBE 3.0 and above */
        uint16_t LinBytesPerScanLine;
        uint8_t BnkNumberOfImagePages;
        uint8_t LinNumberOfImagePages;
        uint8_t LinRedMaskSize, LinRedFieldPosition;
        uint8_t LinGreenMaskSize, LinGreenFieldPosition;
        uint8_t LinBlueMaskSize, LinBlueFieldPosition;
        uint8_t LinRsvdMaskSize, LinRsvdFieldPosition;
        uint32_t MaxPixelClock;
        /* + 1 will fix the size to 256 bytes */
        uint8_t Reserved4[189 + 1];
} __packed;

struct crtciinfoblock {
        uint16_t HorizontalTotal;
        uint16_t HorizontalSyncStart;
        uint16_t HorizontalSyncEnd;
        uint16_t VerticalTotal;
        uint16_t VerticalSyncStart;
        uint16_t VerticalSyncEnd;
        uint8_t Flags;
        uint32_t PixelClock;
        uint16_t RefreshRate;
        uint8_t Reserved[40];
} __packed;

struct paletteentry {
        uint8_t Blue;
        uint8_t Green;
        uint8_t Red;
        uint8_t Reserved;
} __packed;

struct flatpanelinfo
{
        uint16_t HorizontalSize;
        uint16_t VerticalSize;
        uint16_t PanelType;
        uint8_t RedBPP;
        uint8_t GreenBPP;
        uint8_t BlueBPP;
        uint8_t ReservedBPP;
        uint32_t ReservedOffScreenMemSize;
        uint32_t ReservedOffScreenMemPtr;

        uint8_t Reserved[14];
} __packed;

#define VBE_BASE_MODE           (0x100)         /* VBE 3.0 page 18 */
#define VBE_VALID_MODE(a)       ((a) >= VBE_BASE_MODE)
#define VBE_ERROR(a)            (((a) & 0xFF) != 0x4F || ((a) & 0xFF00) != 0)
#define VBE_SUCCESS             (0x004F)
#define VBE_FAILED              (0x014F)
#define VBE_NOTSUP              (0x024F)
#define VBE_INVALID             (0x034F)

#define VGA_TEXT_MODE           (3)             /* 80x25 text mode */
#define TEXT_ROWS               (25)            /* VGATEXT rows */
#define TEXT_COLS               (80)            /* VGATEXT columns */

extern struct paletteentry *pe8;
extern int palette_format;

int vga_get_reg(int, int);
int vga_get_atr(int, int);
void vga_set_atr(int, int, int);
void vga_set_indexed(int, int, int, uint8_t, uint8_t);
int vga_get_indexed(int, int, int, uint8_t);
int vga_get_crtc(int, int);
void vga_set_crtc(int, int, int);
int vga_get_seq(int, int);
void vga_set_seq(int, int, int);
int vga_get_grc(int, int);
void vga_set_grc(int, int, int);

/* high-level VBE helpers, from vbe.c */
bool vbe_is_vga(void);
void bios_set_text_mode(int);
int biosvbe_palette_format(int *);
void vbe_init(void);
bool vbe_available(void);
int vbe_default_mode(void);
int vbe_set_mode(int);
int vbe_get_mode(void);
int vbe_set_palette(const struct paletteentry *, size_t);
void vbe_modelist(int);