diff options
| -rw-r--r-- | arch/arm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/arm/cpu/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/mmuinfo.c | 111 |
3 files changed, 121 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 3eada5b80f..af4cb59496 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -135,7 +135,15 @@ config CMD_ARM_CPUINFO default y help Say yes here to get a cpuinfo command to show some - information about the cp15 registers + CPU information using the cp15 registers + +config CMD_ARM_MMUINFO + bool "mmuinfo command" + depends on CPU_V7 + default n + help + Say yes here to get a mmuinfo command to show some + MMU and cache information using the cp15 registers config CPU_V7_DCACHE_SKIP bool "Skip DCache Invalidate" diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile index e30ae1cc1f..93a34a9ff1 100644 --- a/arch/arm/cpu/Makefile +++ b/arch/arm/cpu/Makefile @@ -7,6 +7,7 @@ obj-y += start.o # Any variants can be called as start-armxyz.S # obj-$(CONFIG_CMD_ARM_CPUINFO) += cpuinfo.o +obj-$(CONFIG_CMD_ARM_MMUINFO) += mmuinfo.o obj-$(CONFIG_MMU) += mmu.o obj-$(CONFIG_CPU_32v4T) += cache-armv4.o obj-$(CONFIG_CPU_32v5) += cache-armv5.o diff --git a/arch/arm/cpu/mmuinfo.c b/arch/arm/cpu/mmuinfo.c new file mode 100644 index 0000000000..6bea34ed50 --- /dev/null +++ b/arch/arm/cpu/mmuinfo.c @@ -0,0 +1,111 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#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_HELP_START(mmuinfo) +BAREBOX_CMD_HELP_USAGE("mmuinfo <address>\n") +BAREBOX_CMD_HELP_SHORT("Show MMU/cache information for an address.\n") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(mmuinfo) + .cmd = do_mmuinfo, + .usage = "mmuinfo <address>", + BAREBOX_CMD_HELP(cmd_mmuinfo_help) +BAREBOX_CMD_END |