101 lines
3 KiB
C
101 lines
3 KiB
C
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/* 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/command.h>
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static grub_command_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 grub_err_t
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grub_cmd_read (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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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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if (cmd->name[5] == 'd')
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value = *((grub_uint32_t *) addr);
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else if (cmd->name[5] == 'w')
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value = *((grub_uint16_t *) addr);
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else
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value = *((grub_uint8_t *) addr);
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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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if (argc != 2)
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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 (cmd->name[6] == 'd')
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*((grub_uint32_t *) addr) = value;
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else if (cmd->name[6] == 'w')
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*((grub_uint16_t *) addr) = (grub_uint16_t) value;
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else
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*((grub_uint8_t *) addr) = (grub_uint8_t) value;
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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_command ("read_byte", grub_cmd_read,
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"read_byte ADDR", "read byte.");
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cmd_read_word =
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grub_register_command ("read_word", grub_cmd_read,
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"read_word ADDR", "read word.");
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cmd_read_dword =
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grub_register_command ("read_dword", grub_cmd_read,
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"read_dword ADDR", "read dword.");
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cmd_write_byte =
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grub_register_command ("write_byte", grub_cmd_write,
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"write_byte ADDR VALUE", "write byte.");
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cmd_write_word =
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grub_register_command ("write_word", grub_cmd_write,
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"write_word ADDR VALUE", "write word.");
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cmd_write_dword =
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grub_register_command ("write_dword", grub_cmd_write,
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"write_dword ADDR VALUE", "write dword.");
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}
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GRUB_MOD_FINI(memrw)
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{
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grub_unregister_command (cmd_read_byte);
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grub_unregister_command (cmd_read_word);
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grub_unregister_command (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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