mirror of
https://github.com/memtest86plus/memtest86plus.git
synced 2024-11-27 01:50:20 -06:00
e92f488753
Use a more efficient algorithm that can be in-lined, and keep the generator state in a local variable.
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef TEST_HELPER_H
|
|
#define TEST_HELPER_H
|
|
/**
|
|
* \file
|
|
*
|
|
* Provides some common definitions and helper functions for the memory
|
|
* tests.
|
|
*
|
|
*//*
|
|
* Copyright (C) 2020-2022 Martin Whitaker.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "test.h"
|
|
|
|
/**
|
|
* Test word atomic read and write functions.
|
|
*/
|
|
#ifdef __x86_64__
|
|
#include "memrw64.h"
|
|
#define read_word read64
|
|
#define write_word write64
|
|
#else
|
|
#include "memrw32.h"
|
|
#define read_word read32
|
|
#define write_word write32
|
|
#endif
|
|
|
|
/**
|
|
* A wrapper for guiding branch prediction.
|
|
*/
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
|
|
|
/**
|
|
* The block size processed between each update of the progress bars and
|
|
* spinners. This also affects how quickly the program will respond to the
|
|
* keyboard.
|
|
*/
|
|
#define SPIN_SIZE (1 << 27) // in testwords
|
|
|
|
/**
|
|
* A macro to perform test bailout when requested.
|
|
*/
|
|
#define BAILOUT if (bail) return ticks
|
|
|
|
/**
|
|
* Returns value rounded down to the nearest multiple of align_size.
|
|
*/
|
|
static inline uintptr_t round_down(uintptr_t value, size_t align_size)
|
|
{
|
|
return value & ~(align_size - 1);
|
|
}
|
|
|
|
/**
|
|
* Returns value rounded up to the nearest multiple of align_size.
|
|
*/
|
|
static inline uintptr_t round_up(uintptr_t value, size_t align_size)
|
|
{
|
|
return (value + (align_size - 1)) & ~(align_size - 1);
|
|
}
|
|
|
|
/**
|
|
* Returns the next word in a pseudo-random sequence where state was the
|
|
* previous word in that sequence.
|
|
*/
|
|
static inline testword_t prsg(testword_t state)
|
|
{
|
|
// This uses the algorithms described at https://en.wikipedia.org/wiki/Xorshift
|
|
#ifdef __x86_64__
|
|
state ^= state << 13;
|
|
state ^= state >> 7;
|
|
state ^= state << 17;
|
|
#else
|
|
state ^= state << 13;
|
|
state ^= state >> 17;
|
|
state ^= state << 5;
|
|
#endif
|
|
return state;
|
|
}
|
|
|
|
/**
|
|
* Calculates the start and end word address for the chunk of segment that is
|
|
* to be tested by my_cpu. The chunk start will be aligned to a multiple of
|
|
* chunk_align.
|
|
*/
|
|
void calculate_chunk(testword_t **start, testword_t **end, int my_cpu, int segment, size_t chunk_align);
|
|
|
|
/**
|
|
* Flushes the CPU caches. If SMP is enabled, synchronises the threads before
|
|
* and after issuing the cache flush instruction.
|
|
*/
|
|
void flush_caches(int my_cpu);
|
|
|
|
#endif // TEST_HELPER_H
|