From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from canuck.infradead.org ([2001:4978:20e::1]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1ShmQ8-0006wg-JB for barebox@lists.infradead.org; Thu, 21 Jun 2012 18:47:56 +0000 Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1ShmQ6-0000h1-Om for barebox@lists.infradead.org; Thu, 21 Jun 2012 18:47:56 +0000 Date: Thu, 21 Jun 2012 20:47:52 +0200 From: Sascha Hauer Message-ID: <20120621184752.GH28394@pengutronix.de> References: <1340294684-20457-1-git-send-email-jlu@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1340294684-20457-1-git-send-email-jlu@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH] mmuinfo: add a command do display the result of virtual to physical translation To: Jan Luebbe Cc: barebox@lists.infradead.org On Thu, Jun 21, 2012 at 06:04:44PM +0200, Jan Luebbe wrote: > Signed-off-by: Jan Luebbe > --- > arch/arm/Kconfig | 10 ++++- > arch/arm/cpu/Makefile | 1 + > arch/arm/cpu/mmuinfo.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 117 insertions(+), 1 deletion(-) > create mode 100644 arch/arm/cpu/mmuinfo.c > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index 8a4e1a2..2f35738 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -123,7 +123,15 @@ 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 e30ae1c..93a34a9 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 0000000..6177785 > --- /dev/null > +++ b/arch/arm/cpu/mmuinfo.c > @@ -0,0 +1,107 @@ > +/* > + * mmuinfo.c - Show MMU/cache information from cp15 registers > + * > + * Copyright (c) Jan Luebbe , 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 > +#include > + > +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 1; return COMMAND_ERROR_USAGE here. > + > + 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, > + .usage = "Show info about MMU", > +BAREBOX_CMD_END Some usage information would be nice, "mmuinfo
" should be sufficient. > + No newline at end of file please. Otherwise, nice debug utility :) Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox