mirror of
https://github.com/memtest86plus/memtest86plus.git
synced 2024-11-27 10:00:17 -06:00
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#ifndef CPULOCAL_H
|
||
|
|
#define CPULOCAL_H
|
||
|
|
/**
|
||
|
|
* \file
|
||
|
|
*
|
||
|
|
* Provides functions to allocate and access thread-local flags.
|
||
|
|
*
|
||
|
|
*//*
|
||
|
|
* Copyright (C) 2022 Martin Whitaker.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "boot.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A single thread-local flag. These are spaced out in memory to ensure each
|
||
|
|
* flag occupies a different cache line.
|
||
|
|
*/
|
||
|
|
typedef struct __attribute__((packed)) {
|
||
|
|
bool flag;
|
||
|
|
uint8_t spacing[AP_STACK_SIZE - sizeof(bool)];
|
||
|
|
} local_flag_t;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Allocates an array of thread-local flags, one per CPU core, and returns
|
||
|
|
* a ID number that identifies the allocated array. Returns -1 if there is
|
||
|
|
* insufficient thread local storage remaining to allocate a new array of
|
||
|
|
* flags.
|
||
|
|
*/
|
||
|
|
int allocate_local_flag(void);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns a pointer to the previously allocated array of thread-local flags
|
||
|
|
* identified by flag_num.
|
||
|
|
*/
|
||
|
|
static inline local_flag_t *local_flags(int flag_num)
|
||
|
|
{
|
||
|
|
// The number returned by allocate_local_flag is the byte offset of the
|
||
|
|
// flag from the start of the thread-local storage.
|
||
|
|
return (local_flag_t *)(_stacks + BSP_STACK_SIZE - LOCALS_SIZE + flag_num);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // CPULOCAL_H
|