thadwarf88
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Fresh Osdever
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Karma: 0
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VBE 3.0 - 2005/02/12 05:41
Hello,
I was programming my OS, but when I want to find the Protected Mode entrypoint for vbe 3.0 I can't find the signature  Here is my source code:
<div class='indent'>
#include "include/vbe.h"
#include "include/types.h"
#include "include/gdt.h"
#include "include/console.h"
#include "include/x86.h"
#include "include/gdt.h"
#include "include/error.h"
#include "include/libc/cstring.h"
extern con console;
extern GDTManager gdt_mgr;
#define VBE_BIOS_SIZE 0x8000 // 32 Kb
char bios[VBE_BIOS_SIZE]; // this holds our bios
typedef struct __PMInfoBlock
{
byte Signature[4];
word EntryPoint;
word PMInitialize;
word BIOSDataSel;
word A0000Sel;
word B0000Sel;
word B8000Sel;
word CodeSegSel;
byte InProtectMode;
byte Cheksum;
} PMInfoBlock, *lpPMInfoBlock;
void init_vbe()
{
console.write("Loading VBE 3.0 Module...");
// copy BIOS into buffer
memcpy(bios, (char*)0xc0000, VBE_BIOS_SIZE);
char* bios_search_ptr = (char*)&bios; // pointer to our BIOS buffer
PMInfoBlock pmode_block; // our info block
char pmid[] = "PMID"; // Signature to look for
// lookup the buffer:
for(int i = 0; i < (VBE_BIOS_SIZE - sizeof(PMInfoBlock)) - 1; i++)
{
// fill pmode_block
memcpy((char*)&pmode_block, bios_search_ptr, sizeof(PMInfoBlock));
// if they are the same we have found the block
if(memcmp((char*)pmid, (char*)&pmode_block.Signature, 4) == 0)
{
console.write(" block found");
}
// increase the pointer to scan the next PMInfoBlock
bios_search_ptr++;
}
console.write(" done\n");
}
</div>
I hope someone can help me.
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