Example #1
0
void*
sigsearch(char* signature)
{
	uintptr p;
	uchar *bda;
	void *r;

	/*
	 * Search for the data structure:
	 * 1) within the first KiB of the Extended BIOS Data Area (EBDA), or
	 * 2) within the last KiB of system base memory if the EBDA segment
	 *    is undefined, or
	 * 3) within the BIOS ROM address space between 0xf0000 and 0xfffff
	 *    (but will actually check 0xe0000 to 0xfffff).
	 */
	bda = BIOSSEG(0x40);
	if(memcmp(KADDR(0xfffd9), "EISA", 4) == 0){
		if((p = (bda[0x0f]<<8)|bda[0x0e]) != 0){
			if((r = sigscan(BIOSSEG(p), 1024, signature)) != nil)
				return r;
		}
	}

	if((p = ((bda[0x14]<<8)|bda[0x13])*1024) != 0){
		if((r = sigscan(KADDR(p-1024), 1024, signature)) != nil)
			return r;
	}
	/* hack for virtualbox: look in KiB below 0xa0000 */
	if((r = sigscan(KADDR(0xa0000-1024), 1024, signature)) != nil)
		return r;

	return sigscan(BIOSSEG(0xe000), 0x20000, signature);
}
Example #2
0
static void*
rsdsearch(char* signature)
{
	uintptr_t p;
	uint8_t *bda;
	void *rsd;

	/*
	 * Search for the data structure signature:
	 * 1) in the first KB of the EBDA;
	 * 2) in the BIOS ROM between 0xE0000 and 0xFFFFF.
	 */
	if(strncmp((char*)KADDR(0xFFFD9), "EISA", 4) == 0){
		bda = BIOSSEG(0x40);
		if((p = (bda[0x0F]<<8)|bda[0x0E])){
			if(rsd = rsdscan(KADDR(p), 1024, signature))
				return rsd;
		}
	}
	return rsdscan(BIOSSEG(0xE000), 0x20000, signature);
}