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/*
* mmuinfo.c - Show MMU/cache information from cp15 registers
*
* Copyright (c) Jan Luebbe <j.luebbe@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <command.h>
static char *inner_attr[] = {
"0b000 Non-cacheable",
"0b001 Strongly-ordered",
"0b010 (reserved)",
"0b011 Device",
"0b100 (reserved)",
"0b101 Write-Back, Write-Allocate",
"0b110 Write-Through",
"0b111 Write-Back, no Write-Allocate",
};
static char *outer_attr[] = {
"0b00 Non-cacheable",
"0b01 Write-Back, Write-Allocate",
"0b10 Write-Through, no Write-Allocate",
"0b11 Write-Back, no Write-Allocate",
};
static void decode_par(unsigned long par)
{
printf(" Physical Address [31:12]: 0x%08lx\n", par & 0xFFFFF000);
printf(" Reserved [11]: 0x%lx\n", (par >> 11) & 0x1);
printf(" Not Outer Shareable [10]: 0x%lx\n", (par >> 10) & 0x1);
printf(" Non-Secure [9]: 0x%lx\n", (par >> 9) & 0x1);
printf(" Impl. def. [8]: 0x%lx\n", (par >> 8) & 0x1);
printf(" Shareable [7]: 0x%lx\n", (par >> 7) & 0x1);
printf(" Inner mem. attr. [6:4]: 0x%lx (%s)\n", (par >> 4) & 0x7,
inner_attr[(par >> 4) & 0x7]);
printf(" Outer mem. attr. [3:2]: 0x%lx (%s)\n", (par >> 2) & 0x3,
outer_attr[(par >> 2) & 0x3]);
printf(" SuperSection [1]: 0x%lx\n", (par >> 1) & 0x1);
printf(" Failure [0]: 0x%lx\n", (par >> 0) & 0x1);
}
static int do_mmuinfo(int argc, char *argv[])
{
unsigned long addr = 0, priv_read, priv_write;
if (argc < 2)
return COMMAND_ERROR_USAGE;
addr = strtoul_suffix(argv[1], NULL, 0);
__asm__ __volatile__(
"mcr p15, 0, %0, c7, c8, 0 @ write VA to PA translation (priv read)\n"
:
: "r" (addr)
: "memory");
__asm__ __volatile__(
"mrc p15, 0, %0, c7, c4, 0 @ read PAR\n"
: "=r" (priv_read)
:
: "memory");
__asm__ __volatile__(
"mcr p15, 0, %0, c7, c8, 1 @ write VA to PA translation (priv write)\n"
:
: "r" (addr)
: "memory");
__asm__ __volatile__(
"mrc p15, 0, %0, c7, c4, 0 @ read PAR\n"
: "=r" (priv_write)
:
: "memory");
printf("PAR result for 0x%08lx: \n", addr);
printf(" privileged read: 0x%08lx\n", priv_read);
decode_par(priv_read);
printf(" privileged write: 0x%08lx\n", priv_write);
decode_par(priv_write);
return 0;
}
BAREBOX_CMD_START(mmuinfo)
.cmd = do_mmuinfo,
BAREBOX_CMD_DESC("show MMU/cache information of an address")
BAREBOX_CMD_OPTS("ADDRESS")
BAREBOX_CMD_GROUP(CMD_GRP_INFO)
BAREBOX_CMD_END
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