diff options
Diffstat (limited to 'arch/arm/cpu/mmuinfo.c')
| -rw-r--r-- | arch/arm/cpu/mmuinfo.c | 139 |
1 files changed, 60 insertions, 79 deletions
diff --git a/arch/arm/cpu/mmuinfo.c b/arch/arm/cpu/mmuinfo.c index c7ec76cf7a..44d6980a75 100644 --- a/arch/arm/cpu/mmuinfo.c +++ b/arch/arm/cpu/mmuinfo.c @@ -1,104 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: 2012 Jan Luebbe <j.luebbe@pengutronix.de>, Pengutronix /* - * 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. - * + * mmuinfo.c - Show MMU/cache information */ #include <common.h> #include <command.h> +#include <getopt.h> +#include <asm/mmuinfo.h> +#include <asm/system_info.h> +#include <zero_page.h> +#include <mmu.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) +int mmuinfo(void *addr) { - 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); + if (IS_ENABLED(CONFIG_CPU_V8)) + return mmuinfo_v8(addr); + if (IS_ENABLED(CONFIG_CPU_V7) && cpu_architecture() == CPU_ARCH_ARMv7) + return mmuinfo_v7(addr); + + return -ENOSYS; } -static int do_mmuinfo(int argc, char *argv[]) +static __maybe_unused int do_mmuinfo(int argc, char *argv[]) { - unsigned long addr = 0, priv_read, priv_write; + unsigned long addr; + int access_zero_page = -1; + int opt; - if (argc < 2) - return COMMAND_ERROR_USAGE; + while ((opt = getopt(argc, argv, "zZ")) > 0) { + switch (opt) { + case 'z': + access_zero_page = true; + break; + case 'Z': + access_zero_page = false; + break; + default: + return COMMAND_ERROR_USAGE; + } + } - addr = strtoul_suffix(argv[1], NULL, 0); + if (access_zero_page >= 0) { + if (argc - optind != 0) + return COMMAND_ERROR_USAGE; - __asm__ __volatile__( - "mcr p15, 0, %0, c7, c8, 0 @ write VA to PA translation (priv read)\n" - : - : "r" (addr) - : "memory"); + if (!zero_page_remappable()) { + pr_warn("No architecture support for zero page remap\n"); + return -ENOSYS; + } - __asm__ __volatile__( - "mrc p15, 0, %0, c7, c4, 0 @ read PAR\n" - : "=r" (priv_read) - : - : "memory"); + if (access_zero_page) + zero_page_access(); + else + zero_page_faulting(); - __asm__ __volatile__( - "mcr p15, 0, %0, c7, c8, 1 @ write VA to PA translation (priv write)\n" - : - : "r" (addr) - : "memory"); + return 0; + } - __asm__ __volatile__( - "mrc p15, 0, %0, c7, c4, 0 @ read PAR\n" - : "=r" (priv_write) - : - : "memory"); + if (argc - optind != 1) + return COMMAND_ERROR_USAGE; - 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); + addr = strtoul_suffix(argv[1], NULL, 0); - return 0; + return mmuinfo((void *)addr); } +BAREBOX_CMD_HELP_START(mmuinfo) +BAREBOX_CMD_HELP_TEXT("Show MMU/cache information using the cp15/model-specific registers.") +BAREBOX_CMD_HELP_TEXT("") +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT ("-z", "enable access to zero page") +BAREBOX_CMD_HELP_OPT ("-Z", "disable access to zero page") +BAREBOX_CMD_HELP_END + +#ifdef CONFIG_COMMAND_SUPPORT BAREBOX_CMD_START(mmuinfo) .cmd = do_mmuinfo, BAREBOX_CMD_DESC("show MMU/cache information of an address") - BAREBOX_CMD_OPTS("ADDRESS") + BAREBOX_CMD_OPTS("[-zZ | ADDRESS]") BAREBOX_CMD_GROUP(CMD_GRP_INFO) + BAREBOX_CMD_HELP(cmd_mmuinfo_help) BAREBOX_CMD_END +#endif |