Get LCD info的方法--- 續

Dos下的方法 (沒試過，手頭上的dos沒debug指令 = =a)
【轉貼】Here
開機後，先進入dos:

C:\>Debug
-A100(開始逐行編輯)
1375:0100 mov ax, 4F15
1375:0103 mox bx, 01
1375:0106 int 10
1375:0108 int 3
1375:0109(退出編輯)
-g（執行）
ax=004F(int10 成功）
-d 0（顯示讀出內容）

前戲：

• 先看，EDID
• 重點： ax=0x4F15，bx=0x01，int=0x10，cx=0~2 ( 好像都可以?! )
• libx86 - a hardware-independent library for executing real-mode x86 code
• 安裝：libx86-dev

程式：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <libx86.h>

int read_edid(void)
{
    struct LRMI_regs regs;
    unsigned char *edid = NULL;

    if (!LRMI_init())
        return -1;

    if ((edid = LRMI_alloc_real(128)) == NULL)
        return -1;

    memset(edid, 0x30, 128);
    memset(&regs, 0, sizeof(regs));

    regs.es = (unsigned int)edid >> 4;
    regs.edi = 0;

    regs.eax = 0x4f15;
    regs.ebx = 0x01;

    ioperm(0,0x400,1); // 需root權限
    iopl(3);

    /*
    printf("edi=0x%x\n", regs.edi);
    printf("esi=0x%x\n", regs.esi);
    printf("ebp=0x%x\n", regs.ebp);
    printf("reserved=0x%x\n", regs.reserved);
    printf("ebx=0x%x\n", regs.ebx);
    printf("edx=0x%x\n", regs.edx);
    printf("ecx=0x%x\n", regs.ecx);
    printf("eax=0x%x\n", regs.eax);
    printf("flags=0x%x\n", regs.flags);
    printf("es=0x%x\n", regs.es);
    printf("ds=0x%x\n", regs.ds);
    printf("fs=0x%x\n", regs.fs);
    printf("gs=0x%x\n", regs.gs);
    printf("ip=0x%x\n", regs.ip);
    printf("cs=0x%x\n", regs.cs);
    printf("sp=0x%x\n", regs.sp);
    printf("ss=0x%x\n", regs.ss);
    */
    LRMI_int( 0x10, &regs );
    /*
    printf("---After LRMI_int---\n");
    printf("edi=0x%x\n", regs.edi);
    printf("esi=0x%x\n", regs.esi);
    printf("ebp=0x%x\n", regs.ebp);
    printf("reserved=0x%x\n", regs.reserved);
    printf("ebx=0x%x\n", regs.ebx);
    printf("edx=0x%x\n", regs.edx);
    printf("ecx=0x%x\n", regs.ecx);
    printf("eax=0x%x\n", regs.eax);  //值會改變   
    printf("flags=0x%x\n", regs.flags);  //值會改變
    printf("es=0x%x\n", regs.es);
    printf("ds=0x%x\n", regs.ds);
    printf("fs=0x%x\n", regs.fs);
    printf("gs=0x%x\n", regs.gs);
    printf("ip=0x%x\n", regs.ip);
    printf("cs=0x%x\n", regs.cs);
    printf("sp=0x%x\n", regs.sp);
    printf("ss=0x%x\n", regs.ss);
    */
    fwrite(edid,128,1,stdout);

    return 0;
}

int main ( int argc, char *argv[])
{
    read_edid();
    return 0;
}


Compile:  gcc test.c -o test -lx86

run: ./test > edid.dat

ref:
1. Here
2. Here