generator/sections/gen-section-pci-bus.c

/**
 * Functions for generating pseudo-random CPER PCI/PCI-X bus error 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 PCI/PCI-X bus error section, saving the resulting address to the given
//location. Returns the size of the newly created section.
size_t generate_section_pci_bus(void** location)
{
    //Create random bytes.
    int size = 72;
    UINT8* bytes = generate_random_bytes(size);
    
    //Set reserved areas to zero.
    UINT64* validation = (UINT64*)bytes;
    *validation &= 0x1FF; //Validation 9-63
    UINT32* reserved = (UINT32*)(bytes + 20);
    *reserved = 0;
    UINT64* bus_command = (UINT64*)(bytes + 40);
    *bus_command &= ((UINT64)0b1 << 56); //Bus command bytes bar bit 56.

    //Fix values that could be above range.
    UINT16* error_type = (UINT16*)(bytes + 16);
    *error_type = rand() % 8;

    //Fix error status.
    create_valid_error_section(bytes + 8);

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