xref: /openbmc/libcper/generator/sections/gen-section-generic.c (revision fedd457d)

/**
 * Functions for generating pseudo-random CPER generic processor sections.
 *
 * Author: Lawrence.Tang@arm.com
 **/

#include <stdlib.h>
#include "../../edk/BaseTypes.h"
#include "../gen-utils.h"
#include "gen-section.h"

//Generates a single pseudo-random generic processor section, saving the resulting address to the given
//location. Returns the size of the newly created section.
size_t generate_section_generic(void **location)
{
	//Create random bytes.
	size_t size = generate_random_section(location, 192);

	//Set reserved locations to zero.
	UINT8 *start_byte = (UINT8 *)*location;
	*((UINT64 *)start_byte) &= 0xFFF;
	*(start_byte + 12) &= 0x7;
	*((UINT16 *)(start_byte + 14)) = 0x0;

	//Ensure CPU brand string does not terminate early.
	for (int i = 0; i < 128; i++) {
		UINT8 *byte = start_byte + 24 + i;
		if (*byte == 0x0) {
			*byte = rand() % 127 + 1;
		}

		//Null terminate last byte.
		if (i == 127) {
			*byte = 0x0;
		}
	}

	return size;
}