VideoModePtr

VideoModePtr：指向显示卡VBE所支持显示模式列表的指针。
每个模式号占一个字节（16）位，模式号以）0FFFFH（-1）结束。

uint16/*far*/ *VideoModePtr;              // 指向所支持显示模式列表的指针
注意：是far指针，这个数组里面都是存放的far指针。
统计模式个数
    //uint16/*far*/ *modeFarPtr = vbeInfo->VideoModePtr;
    /*uint16        *modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
    int count = 0;
    while(*modeRealPtr != (uint16)-1){
        modeFarPtr++;
        modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
        count ++;
    uint16/*far*/ *modeFarPtr = vbeInfo->VideoModePtr;
    uint16        *modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
    int count = 0;
    while(*modeRealPtr != (uint16)-1){
        modeRealPtr ++;
        count ++;
两种写法打印的效果是一样的，但是还是下面的写法在逻辑上更正确一些。
打印每个模式号，36个，每行打印6个
void testVesaSvga(){
    int startLine = 0;
    BOOTINFO *binfo = (BOOTINFO *) 0x0ff0;                          // 在boot中写入
    // 打印寄存器的值
    // sprintf(buf, "[ax: %x], [es: %x], [di: %x]", binfo->scrnx, binfo->scrny, binfo->di);
    // print_str_fix_pos((80*startLine+0)*2, buf);  
    // sprintf(buf, "return [al: %x], [ah: %x]", binfo->vmode, binfo->leds);
    // print_str_fix_pos((80*(startLine++)+0)*2, buf);  
    // 1.打印VBESignature
    VBEINFO *vbeInfo = (VBEINFO *) 0x0ffe;                          // 在boot中写入
    buf[0] = vbeInfo->VBESignature[0];  
    buf[1] = vbeInfo->VBESignature[1]; 
    buf[2] = vbeInfo->VBESignature[2]; 
    buf[3] = vbeInfo->VBESignature[3];
    buf[4] = '\0';  
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    //init_palette();                                                 // 初始化调色板
    //draw_ui(binfo->scrnx, binfo->scrny, binfo->vram);               // 绘制ui
    //putfont8(binfo->vram, binfo->scrnx, 8, 8, COL8_FFFFFF, font_A);   // 打印字符A
    // 2.打印VbeVersion
    sprintf(buf, "VbeVersion       : 0x%4.4X", vbeInfo->VBEVersion);
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 3.打印OEMStringPtr
    sprintf(buf, "OEMStringPtr     : %s", (char*)getAddrFromCharfar((uint32)(vbeInfo->OEMStringPtr)));
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 4.打印显示卡特性
    sprintf(buf, "Capabilities     : 0x%8.8lX", vbeInfo->Capabilities);
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 5.打印VideoModePtr
    //uint16/*far*/ *modeFarPtr = vbeInfo->VideoModePtr;
    /*uint16        *modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
    int count = 0;
    while(*modeRealPtr != (uint16)-1){
        modeFarPtr++;
        modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
        count ++;
    uint16/*far*/ *modeFarPtr = vbeInfo->VideoModePtr;
    uint16        *modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
    int count = 0;
    while(*modeRealPtr != (uint16)-1){
        modeRealPtr ++;
        count ++;
    sprintf(buf, "TotalVideoModeNum: %d", count);
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 36个，每行打印6个
    modeFarPtr = vbeInfo->VideoModePtr;
    modeRealPtr = (uint16 *)getAddrFromCharfar((uint32)(modeFarPtr));
    for(int i=0; i<6; i++){
        uint16 modeNum1 = *(modeFarPtr);
        uint16 modeNum2 = *(modeFarPtr+1);
        uint16 modeNum3 = *(modeFarPtr+2);
        uint16 modeNum4 = *(modeFarPtr+3);
        uint16 modeNum5 = *(modeFarPtr+4);
        uint16 modeNum6 = *(modeFarPtr+5);
        sprintf(buf, "0x%4.4X, 0x%4.4X, 0x%4.4X, 0x%4.4X, 0x%4.4X, 0x%4.4X", modeNum1, modeNum2, modeNum3, modeNum4, modeNum5, modeNum6);
        print_str_fix_pos((80*(startLine++)+0)*2, buf);
        modeFarPtr += 6;
    // 6.打印VRamMemory
    sprintf(buf, "TotalMemory      : 0x%4.4X (%ldKB)", vbeInfo->VRAMMemory, vbeInfo->VRAMMemory * (uint32)64);
    print_str_fix_pos((80*(startLine++)+0)*2, buf); 
    /* 以下为VESA VBE 2.0版本以上定义，2.0版本好像没有!
    // 7.打印OemSoftwareRev
    sprintf(buf, "OemSoftwareRev   : 0x%4.4X", vbeInfo->OemSoftwareRev);
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 8.打印OemVendorNamePtr
    sprintf(buf, "OemVendorNamePtr : %s", (char*)getAddrFromCharfar((uint32)(vbeInfo->OemVendorNamePtr)));
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 9.打印OemProductNamePtr
    sprintf(buf, "OemProductNamePtr: %s", (char*)getAddrFromCharfar((uint32)(vbeInfo->OemProductNamePtr)));
    print_str_fix_pos((80*(startLine++)+0)*2, buf);
    // 7.打印OemSoftwareRev