u-boot/post/lib_powerpc/string.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#include <common.h>

/*
 * CPU test
 * Load/store string instructions:	lswi, stswi, lswx, stswx
 *
 * Several consecutive bytes from a source memory buffer are loaded
 * left to right into GPRs. After that, the bytes are stored
 * from the GPRs into a target memory buffer. The contents
 * of the source and target buffers are then compared.
 */

#include <post.h>
#include "cpu_asm.h"

#if CONFIG_POST & CONFIG_SYS_POST_CPU

extern void cpu_post_exec_02 (ulong *code, ulong op1, ulong op2);
extern void cpu_post_exec_04 (ulong *code, ulong op1, ulong op2, ulong op3,
    ulong op4);

#include <bedbug/regs.h>
int cpu_post_test_string (void)
{
    int ret = 0;
    unsigned int i;
    int flag = disable_interrupts();

    if (ret == 0)
    {
	char src [31], dst [31];

	ulong code[] =
	{
	    ASM_LSWI(5, 3, 31),
	    ASM_STSWI(5, 4, 31),
	    ASM_BLR,
	};

	for (i = 0; i < sizeof(src); i ++)
	{
	    src[i] = (char) i;
	    dst[i] = 0;
	}

	cpu_post_exec_02(code, (ulong)src, (ulong)dst);

	ret = memcmp(src, dst, sizeof(dst)) == 0 ? 0 : -1;
    }

    if (ret == 0)
    {
	char src [95], dst [95];

	ulong code[] =
	{
	    ASM_LSWX(8, 3, 5),
	    ASM_STSWX(8, 4, 5),
	    ASM_BLR,
	};

	for (i = 0; i < sizeof(src); i ++)
	{
	    src[i] = (char) i;
	    dst[i] = 0;
	}

	cpu_post_exec_04(code, (ulong)src, (ulong)dst, 0, sizeof(src));

	ret = memcmp(src, dst, sizeof(dst)) == 0 ? 0 : -1;
    }

    if (ret != 0)
    {
	post_log ("Error at string test !\n");
    }

    if (flag)
	enable_interrupts();

    return ret;
}

#endif