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#include <ll/i386/hw-data.h>
#include <ll/i386/mem.h>
#include <ll/i386/string.h>
#include <ll/i386/x-dos.h>
#include <ll/i386/x-dosmem.h>
#include <ll/i386/cons.h>
#include <ll/sys/ll/ll-func.h>

#include "vesa.h"

VbeInfoBlock  VbeInfo;                 /* VBE 2.0 Informations */
DWORD vbe_screen;             /* Frame Linear Buffer Address */

char VideoModeNames [96][40] = {
   "100 - 640x400      256 colors", "101 - 640x480      256 colors",  "102 - 800x600       16 colors",
   "103 - 800x600      256 colors", "104 - 1024x768      16 colors",  "105 - 1024x768     256 colors",
   "106 - 1280x1024     16 colors", "107 - 1280x1024    256 colors",  "108 - 80x60         Text Mode",
   "109 - 132x25        Text Mode", "10A - 132x43        Text Mode",  "10B - 132x50        Text Mode",
   "10C - 132x60        Text Mode", "10D - 320x200   32,768 colors",  "10E - 320x200   65,536 colors",
   "10F - 320x200      16m colors", "110 - 640x480   32,768 colors",  "111 - 640x480   65,536 colors",
   "112 - 640x480      16m colors", "113 - 800x600   32,768 colors",  "114 - 800x600   65,536 colors",
   "115 - 800x600      16m colors", "116 - 1024x768  32,768 colors",  "117 - 1024x768  65,536 colors",
   "118 - 1024x768     16m colors", "119 - 1280x1024 32,768 colors",  "11A - 1280x1024 65,536 colors",
   "11B - 1280x1024    16m colors", "11C - 640x350      256 colors",  "11D - 640x350   32,768 colors",
   "11E - 640x400   32,768 colors", "11F - 640x350   65,536 colors",  "120 - 640x400   65,536 colors",
   "121 - 640x350      16m colors", "122 - 640x400      16m colors",  "123 - 1600x1200     16 colors",
   "124 - 1600x1200    256 colors", "125 - 1600x1200 32,768 colors",  "126 - 1600x1200 65,536 colors",
   "127 - 1600x1200    16m colors", "128 - 640x480   16m colors(*)",  "129 - 800x600   16m colors(*)",
   "12A - 1024x768  16m colors(*)", "12B - 1280x1024 16m colors(*)",  "12C - 1600x1200 16m colors(*)",
   "12D - 320x240   32,768 colors", "12E - 320x400   32,768 colors",  "12F - 360x200   32,768 colors",
   "130 - 360x240   32,768 colors", "131 - 360x400   32,768 colors",  "132 - 320x240   65,536 colors",
   "133 - 320x400   65,536 colors", "134 - 360x200   65,536 colors",  "135 - 360x240   65,536 colors",
   "136 - 360x400   65,536 colors", "137 - 320x240      16m colors",  "138 - 320x400      16m colors",
   "139 - name n/a",                "13A - name n/a",                 "13B - name n/a",
   "13C - name n/a",                "13D - name n/a",                 "13E - name n/a",
   "13F - name n/a",                "140 - name n/a",                 "141 - name n/a",
   "142 - 640x350   16m colors(*)", "143 - 640x400   16m colors(*)",  "144 - name n/a",
   "145 - name n/a",                "146 - name n/a",                 "147 - name n/a",
   "148 - name n/a",                "149 - name n/a",                 "14A - name n/a",
   "14B - name n/a",                "14C - name n/a",                 "14D - name n/a",
   "14E - name n/a",                "14F - name n/a",                 "150 - 640x350       16 colors",
   "151 - 640x400       16 colors", "152 - 640x480       16 colors",  "153 - 320x200      256 colors",
   "154 - 320x240      256 colors", "155 - 320x400      256 colors",  "156 - 360x200      256 colors",
   "157 - 360x240      256 colors", "158 - 360x400      256 colors",  "159 - name n/a",
   "15A - name n/a",                "15B - name n/a",                 "15C - name n/a",
   "15D - name n/a",                "15E - name n/a",                 "15F - name n/a"
};

int vbe_check_status (WORD vbe_function_result)
{
    if (vbe_function_result != 0x004f) {
        switch (vbe_function_result) {
            case 0x014f : return -1;    /* VBE Generic error */
            case 0x024f : return -2;    /* Hardware incompatibility error */
            case 0x034f : return -3;    /* Unvalid function requested */
            default     : return -4;    /* Unknown error */
        }
    }
    return 1;
}

void vbe_restore_vga(void) {

  X_REGS16 inregs, outregs;
  X_SREGS16 sregs;

#ifndef VM86
  BYTE p1,p2;
#endif
                                                                                                                             
  inregs.x.ax = 0x03;
#ifndef VM86
  p1 = inp(0x21);
  p2 = inp(0xA1);
  outp(0x21,0xFF);
  outp(0xA1,0xFF);
  X_callBIOS(0x10, &inregs, &outregs, &sregs);
  outp(0x21,p1);
  outp(0xA1,p2);
#else
  vm86_callBIOS(0x10, &inregs, &outregs, &sregs);
#endif

}

int vbe_getinfo(void)
{
    X_REGS16  inregs, outregs;              /* registri normali */
    X_SREGS16 sregs;             /* registri estesi */
    LIN_ADDR DOSaddr;
    DWORD linearaddr;
#ifndef VM86
    BYTE p1, p2;
#endif

    /* Allochiamo mem per il nostro blocco */
    if ((DOSaddr = DOS_alloc(sizeof(VbeInfoBlock))) == 0) {
        /*    set_text_mode ();*/
        return -1;
    } else {
/*      linearaddr = appl2linear(DOSaddr);*/
        linearaddr = (DWORD) DOSaddr;

        /* 0x00 = Get Vbe2.0 Info */
        inregs.x.ax = 0x4f00;
        /* Indirizzo reale del nostro blocco */
        inregs.x.di = linearaddr & 0x000F;
        sregs.es = ((linearaddr & 0xFFFF0) >> 4);
        sregs.ds = ((linearaddr & 0xFFFF0) >> 4);

        /* Settiamo il VbeSignature correttamente */
        VbeInfo.VbeSignature[0] = 'V';
        VbeInfo.VbeSignature[1] = 'B';
        VbeInfo.VbeSignature[2] = 'E';
        VbeInfo.VbeSignature[3] = '2';

        memcpy((void *)linearaddr, &VbeInfo, sizeof(VbeInfo));
#ifndef VM86
        p1 = inp(0x21);
        p2 = inp(0xA1);
        outp(0x21,0xFF);
        outp(0xA1,0xFF);
        X_callBIOS(0x10, &inregs, &outregs, &sregs);
        outp(0x21,p1);
        outp(0xA1,p2);
#else
        vm86_callBIOS(0x10, &inregs, &outregs, &sregs);
#endif
        if (vbe_check_status(outregs.x.ax) < 0)
            return -1;
        memcpy(&VbeInfo, (void *)linearaddr, sizeof(VbeInfo));
        return 0;
    }
}

void vbe_showmodes(void)
{
    short int modec;
    WORD list;
    LIN_ADDR VideoModeaddr;

    list=0;
    VideoModeaddr = (LIN_ADDR)((VbeInfo.SupportedModesSegment<<4) + VbeInfo.SupportedModesOffset);

    cprintf ("\nList of modes supported:\n");
    do {
        memcpy(&modec, VideoModeaddr, 2);
        VideoModeaddr += 2;
        if (modec != -1) cprintf ("    %s   ", VideoModeNames[modec - 0x100]);
        list++;
        if (list % 2 == 0) cprintf ("\n");
    } while ((modec != -1) && (list < 40));

    cprintf ("\nToal modes supported: %d", list);
}

DWORD vbe_getmodeinfo(ModeInfoBlock *ModeInfo, WORD Vbe_Mode)
{
    X_REGS16  inregs, outregs;
    X_SREGS16 sregs;
    LIN_ADDR dosaddr;
#ifndef VM86
    BYTE p1, p2;
#endif

    if ((dosaddr = DOS_alloc(sizeof(ModeInfoBlock))) == 0) {
        return(-1);
    }

    /* 0x01 = Get Vbe Mode Info */
    inregs.x.ax = 0x4f01;
    inregs.x.cx  = Vbe_Mode;

    inregs.x.di = (DWORD)dosaddr & 0x000F;
    sregs.es = (((DWORD)dosaddr & 0xFFFF0) >> 4);
    sregs.ds = (((DWORD)dosaddr & 0xFFFF0) >> 4);

#ifndef VM86
        p1 = inp(0x21);
        p2 = inp(0xA1);
        outp(0x21,0xFF);
        outp(0xA1,0xFF);
        X_callBIOS(0x10, &inregs, &outregs, &sregs);
        outp(0x21,p1);
        outp(0xA1,p2);
#else
        vm86_callBIOS(0x10, &inregs, &outregs, &sregs);
#endif
    if (vbe_check_status (outregs.x.ax) < 0) {
        return -1;
    }

    memcpy(ModeInfo, dosaddr, sizeof(ModeInfoBlock));

    vbe_screen = ModeInfo->PhysBasePtr;
    if(vbe_screen == -1) {
        return -1;
    }
    return vbe_screen;
}

DWORD vbe_getflb(void)
{
    return vbe_screen;
}

int vbe_setmode (WORD Vbe_Mode)
{
    X_REGS16 inregs, outregs;
    X_SREGS16 sregs;
#ifndef VM86
    BYTE p1, p2;
#endif

    memset (&inregs, 0, sizeof(inregs));
    /* Set Vesa Vbe mode */
    inregs.x.ax = 0x4f02;
    inregs.x.bx = Vbe_Mode;
#ifndef VM86
        p1 = inp(0x21);
        p2 = inp(0xA1);
        outp(0x21,0xFF);
        outp(0xA1,0xFF);
        X_callBIOS(0x10, &inregs, &outregs, &sregs);
        outp(0x21,p1);
        outp(0xA1,p2);
#else
        vm86_callBIOS(0x10, &inregs, &outregs, &sregs);
#endif

    return 1; //vbe_check_status (outregs.x.ax);

}

WORD vbe_getbpr(ModeInfoBlock *ModeInfo)
{
    return ModeInfo->BytesPerScanLine;
}

int vbe_setbank(ModeInfoBlock *ModeInfo, BYTE bank)
{
    X_REGS16 inregs, outregs;
    X_SREGS16 sregs;
#ifndef VM86
    BYTE p1, p2;
#endif

    memset (&inregs, 0, sizeof(inregs));
    memset (&sregs, 0, sizeof(sregs));
    /* Set Window */
    inregs.x.ax = 0x4f05;
    inregs.h.bh = 0x00;
    inregs.h.bl = 0x00;
    inregs.x.dx = (64 / ModeInfo->WinGranularity) * bank;
#ifndef VM86
        p1 = inp(0x21);
        p2 = inp(0xA1);
        outp(0x21,0xFF);
        outp(0xA1,0xFF);
        X_callBIOS(0x10, &inregs, &outregs, &sregs);
        outp(0x21,p1);
        outp(0xA1,p2);
#else
        vm86_callBIOS(0x10, &inregs, &outregs, &sregs);
#endif
    return vbe_check_status (outregs.x.ax);
}

DWORD vbe_getmem(void)
{
    return (VbeInfo.TotalMemory<<6) * 1024;
}