From: Claudio Mignanti Date: Fri, 23 Jul 2010 13:53:05 +0000 (+0000) Subject: [packages] add devmem2 X-Git-Url: http://git.openwrt.org/?p=openwrt%2Fsvn-archive%2Farchive.git;a=commitdiff_plain;hb=bb70ed0a54c5db0e594591d5eacff3ebb70d5974 [packages] add devmem2 SVN-Revision: 22369 --- diff --git a/utils/devmem2/Makefile b/utils/devmem2/Makefile new file mode 100644 index 0000000000..baa1337167 --- /dev/null +++ b/utils/devmem2/Makefile @@ -0,0 +1,37 @@ +# +# Copyright (C) 2010 OpenWrt.org +# +# This is free software, licensed under the GNU General Public License v2. +# See /LICENSE for more information. +# + +include $(TOPDIR)/rules.mk + +PKG_NAME:=devmem2 +PKG_RELEASE:=1 + +PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME) + +include $(INCLUDE_DIR)/package.mk + +define Package/devmem2 + SECTION:=utils + CATEGORY:=Utilities + TITLE:=Simple program to read/write from memory. +endef + +define Package/devmem2/description + Simple program to read/write from/to any location in memory. +endef + +define Build/Prepare + mkdir -p $(PKG_BUILD_DIR) + $(CP) ./src/* $(PKG_BUILD_DIR)/ +endef + +define Package/devmem2/install + $(INSTALL_DIR) $(1)/usr/sbin + $(INSTALL_BIN) $(PKG_BUILD_DIR)/devmem2 $(1)/usr/sbin/devmem2 +endef + +$(eval $(call BuildPackage,devmem2)) diff --git a/utils/devmem2/src/Makefile b/utils/devmem2/src/Makefile new file mode 100644 index 0000000000..1db49ca058 --- /dev/null +++ b/utils/devmem2/src/Makefile @@ -0,0 +1,13 @@ +OBJ = devmem2.o + +all: compile + +%.o: %.c + $(CC) $(CFLAGS) -c -o $@ $< + +compile: $(OBJ) + $(CC) -o devmem2 $(LDFLAGS) $(OBJ) + +clean: + rm -f *.o *.so devmem2 + diff --git a/utils/devmem2/src/devmem2.c b/utils/devmem2/src/devmem2.c new file mode 100644 index 0000000000..0c1b5b3521 --- /dev/null +++ b/utils/devmem2/src/devmem2.c @@ -0,0 +1,132 @@ +/* + * devmem2.c: Simple program to read/write from/to any location in memory. + * + * Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl) + * + * + * This software has been developed for the LART computing board + * (http://www.lart.tudelft.nl/). The development has been sponsored by + * the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/) + * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/) + * projects. + * + * The author can be reached at: + * + * Jan-Derk Bakker + * Information and Communication Theory Group + * Faculty of Information Technology and Systems + * Delft University of Technology + * P.O. Box 5031 + * 2600 GA Delft + * The Netherlands + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \ + __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0) + +#define MAP_SIZE 4096UL +#define MAP_MASK (MAP_SIZE - 1) + +int main(int argc, char **argv) { + int fd; + void *map_base, *virt_addr; + unsigned long read_result, writeval; + off_t target; + int access_type = 'w'; + + if(argc < 2) { + fprintf(stderr, "\nUsage:\t%s { address } [ type [ data ] ]\n" + "\taddress : memory address to act upon\n" + "\ttype : access operation type : [b]yte, [h]alfword, [w]ord\n" + "\tdata : data to be written\n\n", + argv[0]); + exit(1); + } + target = strtoul(argv[1], 0, 0); + + if(argc > 2) + access_type = tolower(argv[2][0]); + + + if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL; + printf("/dev/mem opened.\n"); + fflush(stdout); + + /* Map one page */ + map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~MAP_MASK); + if(map_base == (void *) -1) FATAL; + printf("Memory mapped at address %p.\n", map_base); + fflush(stdout); + + virt_addr = map_base + (target & MAP_MASK); + switch(access_type) { + case 'b': + read_result = *((unsigned char *) virt_addr); + break; + case 'h': + read_result = *((unsigned short *) virt_addr); + break; + case 'w': + read_result = *((unsigned long *) virt_addr); + break; + default: + fprintf(stderr, "Illegal data type '%c'.\n", access_type); + exit(2); + } + printf("Value at address 0x%lX (%p): 0x%lX\n", target, virt_addr, read_result); + fflush(stdout); + + if(argc > 3) { + writeval = strtoul(argv[3], 0, 0); + switch(access_type) { + case 'b': + *((unsigned char *) virt_addr) = writeval; + read_result = *((unsigned char *) virt_addr); + break; + case 'h': + *((unsigned short *) virt_addr) = writeval; + read_result = *((unsigned short *) virt_addr); + break; + case 'w': + *((unsigned long *) virt_addr) = writeval; + read_result = *((unsigned long *) virt_addr); + break; + } + printf("Written 0x%lX; readback 0x%lX\n", writeval, read_result); + fflush(stdout); + } + + if(munmap(map_base, MAP_SIZE) == -1) FATAL; + close(fd); + return 0; +} + +