102 lines
3 KiB
C
102 lines
3 KiB
C
|
/* memrw.c - command to read / write physical memory */
|
||
|
|
/*
|
||
|
|
* GRUB -- GRand Unified Bootloader
|
||
|
|
* Copyright (C) 2009 Free Software Foundation, Inc.
|
||
|
|
*
|
||
|
|
* GRUB 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 3 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <grub/dl.h>
|
||
|
|
#include <grub/misc.h>
|
||
|
|
#include <grub/command.h>
|
||
|
|
|
||
|
|
static grub_command_t cmd_read_byte, cmd_read_word, cmd_read_dword;
|
||
|
|
static grub_command_t cmd_write_byte, cmd_write_word, cmd_write_dword;
|
||
|
|
|
||
|
|
static grub_err_t
|
||
|
|
grub_cmd_read (grub_command_t cmd, int argc, char **argv)
|
||
|
|
{
|
||
|
|
grub_target_addr_t addr;
|
||
|
|
grub_uint32_t value;
|
||
|
|
|
||
|
|
if (argc != 1)
|
||
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments");
|
||
|
|
|
||
|
|
addr = grub_strtoul (argv[0], 0, 0);
|
||
|
|
if (cmd->name[5] == 'd')
|
||
|
|
value = *((grub_uint32_t *) addr);
|
||
|
|
else if (cmd->name[5] == 'w')
|
||
|
|
value = *((grub_uint16_t *) addr);
|
||
|
|
else
|
||
|
|
value = *((grub_uint8_t *) addr);
|
||
|
|
|
||
|
|
grub_printf ("0x%x\n", value);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static grub_err_t
|
||
|
|
grub_cmd_write (grub_command_t cmd, int argc, char **argv)
|
||
|
|
{
|
||
|
|
grub_target_addr_t addr;
|
||
|
|
grub_uint32_t value;
|
||
|
|
|
||
|
|
if (argc != 2)
|
||
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments");
|
||
|
|
|
||
|
|
addr = grub_strtoul (argv[0], 0, 0);
|
||
|
|
value = grub_strtoul (argv[1], 0, 0);
|
||
|
|
if (cmd->name[6] == 'd')
|
||
|
|
*((grub_uint32_t *) addr) = value;
|
||
|
|
else if (cmd->name[6] == 'w')
|
||
|
|
*((grub_uint16_t *) addr) = (grub_uint16_t) value;
|
||
|
|
else
|
||
|
|
*((grub_uint8_t *) addr) = (grub_uint8_t) value;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
GRUB_MOD_INIT(memrw)
|
||
|
|
{
|
||
|
|
(void) mod; /* To stop warning. */
|
||
|
|
cmd_read_byte =
|
||
|
|
grub_register_command ("read_byte", grub_cmd_read,
|
||
|
|
"read_byte ADDR", "read byte.");
|
||
|
|
cmd_read_word =
|
||
|
|
grub_register_command ("read_word", grub_cmd_read,
|
||
|
|
"read_word ADDR", "read word.");
|
||
|
|
cmd_read_dword =
|
||
|
|
grub_register_command ("read_dword", grub_cmd_read,
|
||
|
|
"read_dword ADDR", "read dword.");
|
||
|
|
cmd_write_byte =
|
||
|
|
grub_register_command ("write_byte", grub_cmd_write,
|
||
|
|
"write_byte ADDR VALUE", "write byte.");
|
||
|
|
cmd_write_word =
|
||
|
|
grub_register_command ("write_word", grub_cmd_write,
|
||
|
|
"write_word ADDR VALUE", "write word.");
|
||
|
|
cmd_write_dword =
|
||
|
|
grub_register_command ("write_dword", grub_cmd_write,
|
||
|
|
"write_dword ADDR VALUE", "write dword.");
|
||
|
|
}
|
||
|
|
|
||
|
|
GRUB_MOD_FINI(memrw)
|
||
|
|
{
|
||
|
|
grub_unregister_command (cmd_read_byte);
|
||
|
|
grub_unregister_command (cmd_read_word);
|
||
|
|
grub_unregister_command (cmd_read_dword);
|
||
|
|
grub_unregister_command (cmd_write_byte);
|
||
|
|
grub_unregister_command (cmd_write_word);
|
||
|
|
grub_unregister_command (cmd_write_dword);
|
||
|
|
}
|