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