150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* memrw.c - command to read / write physical memory */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/extcmd.h>
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#include <grub/env.h>
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#include <grub/i18n.h>
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static grub_extcmd_t cmd_read_byte, cmd_read_word, cmd_read_dword;
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static grub_command_t cmd_write_byte, cmd_write_word, cmd_write_dword;
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static const struct grub_arg_option options[] =
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{
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{0, 'v', 0, N_("Save read value into variable VARNAME."),
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"VARNAME", ARG_TYPE_STRING},
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{0, 0, 0, 0, 0, 0}
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};
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static grub_err_t
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grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv)
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{
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grub_target_addr_t addr;
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grub_uint32_t value = 0;
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char buf[sizeof ("XXXXXXXX")];
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid number of arguments");
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addr = grub_strtoul (argv[0], 0, 0);
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switch (cmd->cmd->name[sizeof ("read_") - 1])
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{
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case 'd':
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value = *((volatile grub_uint32_t *) addr);
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break;
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case 'w':
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value = *((volatile grub_uint16_t *) addr);
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break;
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case 'b':
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value = *((volatile grub_uint8_t *) addr);
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break;
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}
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if (cmd->state[0].set)
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{
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grub_snprintf (buf, sizeof (buf), "%x", value);
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grub_env_set (cmd->state[0].arg, buf);
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}
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else
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grub_printf ("0x%x\n", value);
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return 0;
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}
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static grub_err_t
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grub_cmd_write (grub_command_t cmd, int argc, char **argv)
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{
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grub_target_addr_t addr;
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grub_uint32_t value;
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grub_uint32_t mask = 0xffffffff;
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if (argc != 2 && argc != 3)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid number of arguments");
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addr = grub_strtoul (argv[0], 0, 0);
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value = grub_strtoul (argv[1], 0, 0);
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if (argc == 3)
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mask = grub_strtoul (argv[2], 0, 0);
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value &= mask;
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switch (cmd->name[sizeof ("write_") - 1])
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{
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case 'd':
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if (mask != 0xffffffff)
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*((volatile grub_uint32_t *) addr)
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= (*((volatile grub_uint32_t *) addr) & ~mask) | value;
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else
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*((volatile grub_uint32_t *) addr) = value;
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break;
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case 'w':
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if ((mask & 0xffff) != 0xffff)
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*((volatile grub_uint16_t *) addr)
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= (*((volatile grub_uint16_t *) addr) & ~mask) | value;
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else
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*((volatile grub_uint16_t *) addr) = value;
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break;
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case 'b':
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if ((mask & 0xff) != 0xff)
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*((volatile grub_uint8_t *) addr)
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= (*((volatile grub_uint8_t *) addr) & ~mask) | value;
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else
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*((volatile grub_uint8_t *) addr) = value;
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break;
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}
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return 0;
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}
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GRUB_MOD_INIT(memrw)
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{
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cmd_read_byte =
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grub_register_extcmd ("read_byte", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
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N_("ADDR"), N_("Read byte from ADDR."), options);
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cmd_read_word =
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grub_register_extcmd ("read_word", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
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N_("ADDR"), N_("Read word from ADDR."), options);
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cmd_read_dword =
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grub_register_extcmd ("read_dword", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
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N_("ADDR"), N_("Read dword from ADDR."), options);
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cmd_write_byte =
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grub_register_command ("write_byte", grub_cmd_write,
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N_("ADDR VALUE [MASK]"), N_("Write byte VALUE to ADDR."));
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cmd_write_word =
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grub_register_command ("write_word", grub_cmd_write,
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N_("ADDR VALUE [MASK]"), N_("Write word VALUE to ADDR."));
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cmd_write_dword =
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grub_register_command ("write_dword", grub_cmd_write,
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N_("ADDR VALUE [MASK]"), N_("Write dword VALUE to ADDR."));
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}
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GRUB_MOD_FINI(memrw)
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{
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grub_unregister_extcmd (cmd_read_byte);
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grub_unregister_extcmd (cmd_read_word);
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grub_unregister_extcmd (cmd_read_dword);
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grub_unregister_command (cmd_write_byte);
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grub_unregister_command (cmd_write_word);
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grub_unregister_command (cmd_write_dword);
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}
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