tools/testing/selftests/powerpc/pmu/ebb/reg_access_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/powerpc/pmu/ebb/reg_access_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/powerpc/pmu/ebb/reg_access_test.c
Extension
.c
Size
673 bytes
Lines
41
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2014, Michael Ellerman, IBM Corp.
 */

#include <stdio.h>
#include <stdlib.h>

#include "ebb.h"


/*
 * Test basic access to the EBB regs, they should be user accessible with no
 * kernel interaction required.
 */
int reg_access(void)
{
	uint64_t val, expected;

	SKIP_IF(!ebb_is_supported());

	expected = 0x8000000100000000ull;
	mtspr(SPRN_BESCR, expected);
	val = mfspr(SPRN_BESCR);

	FAIL_IF(val != expected);

	expected = 0x0000000001000000ull;
	mtspr(SPRN_EBBHR, expected);
	val = mfspr(SPRN_EBBHR);

	FAIL_IF(val != expected);

	return 0;
}

int main(void)
{
	return test_harness(reg_access, "reg_access");
}

Annotation

Implementation Notes