generator/sections/gen-section-pcie.c

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

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

#define PCIE_PORT_TYPES (int []){0, 1, 4, 5, 6, 7, 8, 9, 10}

//Generates a single pseudo-random PCIe error section, saving the resulting address to the given
//location. Returns the size of the newly created section.
size_t generate_section_pcie(void** location)
{
    //Create random bytes.
    int size = 208;
    UINT8* bytes = generate_random_bytes(size);
    
    //Set reserved areas to zero.
    UINT64* validation = (UINT64*)bytes;
    *validation &= 0xFF; //Validation 8-63
    UINT32* version = (UINT32*)(bytes + 12);
    *version &= 0xFFFF; //Version bytes 2-3
    UINT32* reserved = (UINT32*)(bytes + 20);
    *reserved = 0; //Reserved bytes 20-24
    *(bytes + 37) &= ~0b111; //Device ID byte 13 bits 0-3
    *(bytes + 39) = 0; //Device ID byte 15

    //Set expected values.
    int minor = rand() % 128;
    int major = rand() % 128;
    *version = int_to_bcd(minor);
    *version |= int_to_bcd(major) << 8;

    //Fix values that could be above range.
    UINT32* port_type = (UINT32*)(bytes + 8);
    *port_type = PCIE_PORT_TYPES[rand() % (sizeof(PCIE_PORT_TYPES) / sizeof(int))];

    //Set return values, exit.
    *location = bytes;
    return size;
}