150 lines
4 KiB
C
150 lines
4 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/extcmd.h>
|
|
#include <grub/env.h>
|
|
#include <grub/cpu/io.h>
|
|
#include <grub/i18n.h>
|
|
|
|
static grub_extcmd_t cmd_read_byte, cmd_read_word, cmd_read_dword;
|
|
static grub_command_t cmd_write_byte, cmd_write_word, cmd_write_dword;
|
|
|
|
static const struct grub_arg_option options[] =
|
|
{
|
|
{0, 'v', 0, N_("Save read value into variable VARNAME."),
|
|
N_("VARNAME"), ARG_TYPE_STRING},
|
|
{0, 0, 0, 0, 0, 0}
|
|
};
|
|
|
|
|
|
static grub_err_t
|
|
grub_cmd_read (grub_extcmd_context_t ctxt, int argc, char **argv)
|
|
{
|
|
grub_target_addr_t addr;
|
|
grub_uint32_t value = 0;
|
|
|
|
if (argc != 1)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments");
|
|
|
|
addr = grub_strtoul (argv[0], 0, 0);
|
|
switch (ctxt->extcmd->cmd->name[sizeof ("in") - 1])
|
|
{
|
|
case 'l':
|
|
value = grub_inl (addr);
|
|
break;
|
|
|
|
case 'w':
|
|
value = grub_inw (addr);
|
|
break;
|
|
|
|
case 'b':
|
|
value = grub_inb (addr);
|
|
break;
|
|
}
|
|
|
|
if (ctxt->state[0].set)
|
|
{
|
|
char buf[sizeof ("XXXXXXXX")];
|
|
grub_snprintf (buf, sizeof (buf), "%x", value);
|
|
grub_env_set (ctxt->state[0].arg, buf);
|
|
}
|
|
else
|
|
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;
|
|
grub_uint32_t mask = 0xffffffff;
|
|
|
|
if (argc != 2 && argc != 3)
|
|
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 (argc == 3)
|
|
mask = grub_strtoul (argv[2], 0, 0);
|
|
value &= mask;
|
|
switch (cmd->name[sizeof ("out") - 1])
|
|
{
|
|
case 'l':
|
|
if (mask != 0xffffffff)
|
|
grub_outl ((grub_inl (addr) & ~mask) | value, addr);
|
|
else
|
|
grub_outl (value, addr);
|
|
break;
|
|
|
|
case 'w':
|
|
if ((mask & 0xffff) != 0xffff)
|
|
grub_outw ((grub_inw (addr) & ~mask) | value, addr);
|
|
else
|
|
grub_outw (value, addr);
|
|
break;
|
|
|
|
case 'b':
|
|
if ((mask & 0xff) != 0xff)
|
|
grub_outb ((grub_inb (addr) & ~mask) | value, addr);
|
|
else
|
|
grub_outb (value, addr);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
GRUB_MOD_INIT(memrw)
|
|
{
|
|
cmd_read_byte =
|
|
grub_register_extcmd ("inb", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
|
|
N_("PORT"), N_("Read byte from PORT."), options);
|
|
cmd_read_word =
|
|
grub_register_extcmd ("inw", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
|
|
N_("PORT"), N_("Read word from PORT."), options);
|
|
cmd_read_dword =
|
|
grub_register_extcmd ("inl", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH,
|
|
N_("PORT"), N_("Read dword from PORT."), options);
|
|
cmd_write_byte =
|
|
grub_register_command ("outb", grub_cmd_write,
|
|
N_("PORT VALUE [MASK]"),
|
|
N_("Write byte VALUE to PORT."));
|
|
cmd_write_word =
|
|
grub_register_command ("outw", grub_cmd_write,
|
|
N_("PORT VALUE [MASK]"),
|
|
N_("Write word VALUE to PORT."));
|
|
cmd_write_dword =
|
|
grub_register_command ("outl", grub_cmd_write,
|
|
N_("ADDR VALUE [MASK]"),
|
|
N_("Write dword VALUE to PORT."));
|
|
}
|
|
|
|
GRUB_MOD_FINI(memrw)
|
|
{
|
|
grub_unregister_extcmd (cmd_read_byte);
|
|
grub_unregister_extcmd (cmd_read_word);
|
|
grub_unregister_extcmd (cmd_read_dword);
|
|
grub_unregister_command (cmd_write_byte);
|
|
grub_unregister_command (cmd_write_word);
|
|
grub_unregister_command (cmd_write_dword);
|
|
}
|