busybox-devmem.patch

   1 diff -Nrup include/applets.h include/applets.h
   2 --- include/applets.h   2008-04-26 18:22:37.000000000 +0000
   3 +++ include/applets.h   2008-04-26 18:19:53.000000000 +0000
   4 @@ -121,6 +121,7 @@ USE_DEALLOCVT(APPLET(deallocvt, _BB_DIR_
   5  USE_DELGROUP(APPLET_ODDNAME(delgroup, deluser, _BB_DIR_BIN, _BB_SUID_NEVER, delgroup))
   6  USE_DELUSER(APPLET(deluser, _BB_DIR_BIN, _BB_SUID_NEVER))
   7  USE_DEVFSD(APPLET(devfsd, _BB_DIR_SBIN, _BB_SUID_NEVER))
   8 +USE_DEVMEM(APPLET(devmem, _BB_DIR_SBIN, _BB_SUID_NEVER))
   9  USE_DF(APPLET(df, _BB_DIR_BIN, _BB_SUID_NEVER))
  10  USE_APP_DHCPRELAY(APPLET(dhcprelay, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
  11  USE_DIFF(APPLET(diff, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
  12 diff -Nrup include/usage.h include/usage.h
  13 --- include/usage.h     2007-12-21 22:00:31.000000000 +0000
  14 +++ include/usage.h     2008-04-26 18:21:59.000000000 +0000
  15 @@ -630,6 +630,16 @@
  16         "\n             and processing synthetic REGISTER events," \
  17         "\n             do not poll for events")
  18
  19 +#define devmem_trivial_usage \
  20 +       "{ address } [ type [ data ] ]"
  21 +
  22 +#define devmem_full_usage \
  23 +       "Read/Write from physical addresses" \
  24 +       "\n\nUsage:  devmem { address } [ type [ data ] ]" \
  25 +       "\n     address : memory address to act upon" \
  26 +       "\n     type    : access operation type : [b]yte, [h]alfword, [w]ord" \
  27 +       "\n     data    : data to be written"
  28 +
  29  /* -k is accepted but ignored for !HUMAN_READABLE,
  30   * but we won't mention this (unimportant) */
  31  #if ENABLE_FEATURE_HUMAN_READABLE || ENABLE_FEATURE_DF_INODE
  32 diff -Nrup miscutils/Config.in miscutils/Config.in
  33 --- miscutils/Config.in 2007-12-21 22:00:31.000000000 +0000
  34 +++ miscutils/Config.in 2008-04-26 17:54:51.000000000 +0000
  35 @@ -120,6 +120,13 @@ config FEATURE_DEVFS
  36           /dev/loop0.  If your /dev directory has normal names instead of
  37           devfs names, you don't want this.
  38
  39 +config DEVMEM
  40 +       bool "devmem"
  41 +       default y
  42 +       help
  43 +       devmem is a small program that reads and writes from physical
  44 +       memory using /dev/mem.
  45 +
  46  config EJECT
  47         bool "eject"
  48         default n
  49 diff -Nrup miscutils/Kbuild miscutils/Kbuild
  50 --- miscutils/Kbuild    2007-12-21 22:00:31.000000000 +0000
  51 +++ miscutils/Kbuild    2008-04-26 17:56:36.000000000 +0000
  52 @@ -12,6 +12,7 @@ lib-$(CONFIG_CROND)       += crond.o
  53  lib-$(CONFIG_CRONTAB)     += crontab.o
  54  lib-$(CONFIG_DC)          += dc.o
  55  lib-$(CONFIG_DEVFSD)      += devfsd.o
  56 +lib-$(CONFIG_DEVMEM)      += devmem.o
  57  lib-$(CONFIG_EJECT)       += eject.o
  58  lib-$(CONFIG_HDPARM)      += hdparm.o
  59  lib-$(CONFIG_LAST)        += last.o
  60 diff -Nrup miscutils/devmem.c miscutils/devmem.c
  61 --- miscutils/devmem.c  1970-01-01 00:00:00.000000000 +0000
  62 +++ miscutils/devmem.c  2008-04-26 18:18:30.000000000 +0000
  63 @@ -0,0 +1,65 @@
  64 +/*
  65 + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  66 + *  Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
  67 + *  Copyright (C) 2008, BusyBox Team. -solar 4/26/08
  68 + */
  69 +
  70 +#include "libbb.h"
  71 +
  72 +#define DEVMEM_MAP_SIZE 4096UL
  73 +#define DEVMEM_MAP_MASK (DEVMEM_MAP_SIZE - 1)
  74 +
  75 +int devmem_main(int argc, char **argv) {
  76 +       void *map_base, *virt_addr;
  77 +       unsigned long read_result, writeval;
  78 +       off_t target;
  79 +       int fd, access_type = 'w';
  80 +
  81 +       if (argc < 2)
  82 +               bb_show_usage();
  83 +
  84 +       target = bb_strtoul(argv[1], 0, 0);
  85 +
  86 +       if (argc > 2)
  87 +               access_type = tolower(argv[2][0]);
  88 +
  89 +       fd = xopen("/dev/mem", O_RDWR | O_SYNC);
  90 +
  91 +       if ((map_base = mmap(0, DEVMEM_MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~DEVMEM_MAP_MASK)) == MAP_FAILED)
  92 +               bb_perror_msg_and_die("mmap");
  93 +
  94 +       printf("Memory mapped at address %p.\n", map_base);
  95 +
  96 +       virt_addr = map_base + (target & DEVMEM_MAP_MASK);
  97 +       if (access_type == 'b')
  98 +               read_result = *((unsigned char *) virt_addr);
  99 +       else if (access_type == 'h')
 100 +               read_result = *((unsigned short *) virt_addr);
 101 +       else if (access_type == 'w')
 102 +               read_result = *((unsigned long *) virt_addr);
 103 +       else {
 104 +               fprintf(stderr, "Illegal data type '%c'\n", access_type);
 105 +               exit(EXIT_FAILURE);
 106 +       }
 107 +       printf("Value at address 0x%X (%p): 0x%X\n", target, virt_addr, read_result);
 108 +
 109 +       if (argc > 3) {
 110 +               writeval = bb_strtoul(argv[3], 0, 0);
 111 +               if (access_type == 'b') {
 112 +                       *((unsigned char *) virt_addr) = writeval;
 113 +                       read_result = *((unsigned char *) virt_addr);
 114 +               } else if (access_type == 'h') {
 115 +                       *((unsigned short *) virt_addr) = writeval;
 116 +                       read_result = *((unsigned short *) virt_addr);
 117 +               } else if (access_type == 'w') {
 118 +                       *((unsigned long *) virt_addr) = writeval;
 119 +                       read_result = *((unsigned long *) virt_addr);
 120 +               }
 121 +               printf("Written 0x%X; readback 0x%X\n", writeval, read_result);
 122 +       }
 123 +
 124 +       if (munmap(map_base, DEVMEM_MAP_SIZE) == -1)
 125 +               bb_perror_msg_and_die("munmap");
 126 +       close(fd);
 127 +       fflush_stdout_and_exit(EXIT_SUCCESS);
 128 +}