84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/* wrmsr.c - Write CPU model-specific registers. */
|
|
/*
|
|
* VAS_EBOOT -- GRand Unified Bootloader
|
|
* Copyright (C) 2019 Free Software Foundation, Inc.
|
|
* Based on gcc/gcc/config/i386/driver-i386.c
|
|
*
|
|
* VAS_EBOOT 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.
|
|
*
|
|
* VAS_EBOOT 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 VAS_EBOOT. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <VasEBoot/dl.h>
|
|
#include <VasEBoot/misc.h>
|
|
#include <VasEBoot/mm.h>
|
|
#include <VasEBoot/env.h>
|
|
#include <VasEBoot/command.h>
|
|
#include <VasEBoot/extcmd.h>
|
|
#include <VasEBoot/lockdown.h>
|
|
#include <VasEBoot/i18n.h>
|
|
#include <VasEBoot/i386/cpuid.h>
|
|
#include <VasEBoot/i386/msr.h>
|
|
|
|
VAS_EBOOT_MOD_LICENSE("GPLv3+");
|
|
|
|
static VasEBoot_command_t cmd_write;
|
|
|
|
static VasEBoot_err_t
|
|
VasEBoot_cmd_msr_write (VasEBoot_command_t cmd __attribute__ ((unused)), int argc, char **argv)
|
|
{
|
|
VasEBoot_err_t err;
|
|
VasEBoot_uint32_t addr;
|
|
VasEBoot_uint64_t value;
|
|
const char *ptr;
|
|
|
|
err = VasEBoot_cpu_is_msr_supported ();
|
|
|
|
if (err != VAS_EBOOT_ERR_NONE)
|
|
return VasEBoot_error (err, N_("WRMSR is unsupported"));
|
|
|
|
if (argc != 2)
|
|
return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("two arguments expected"));
|
|
|
|
VasEBoot_errno = VAS_EBOOT_ERR_NONE;
|
|
ptr = argv[0];
|
|
addr = VasEBoot_strtoul (ptr, &ptr, 0);
|
|
|
|
if (VasEBoot_errno != VAS_EBOOT_ERR_NONE)
|
|
return VasEBoot_errno;
|
|
if (*ptr != '\0')
|
|
return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("invalid argument"));
|
|
|
|
ptr = argv[1];
|
|
value = VasEBoot_strtoull (ptr, &ptr, 0);
|
|
|
|
if (VasEBoot_errno != VAS_EBOOT_ERR_NONE)
|
|
return VasEBoot_errno;
|
|
if (*ptr != '\0')
|
|
return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("invalid argument"));
|
|
|
|
VasEBoot_wrmsr (addr, value);
|
|
|
|
return VAS_EBOOT_ERR_NONE;
|
|
}
|
|
|
|
VAS_EBOOT_MOD_INIT(wrmsr)
|
|
{
|
|
cmd_write = VasEBoot_register_command_lockdown ("wrmsr", VasEBoot_cmd_msr_write, N_("ADDR VALUE"),
|
|
N_("Write a value to a CPU model specific register."));
|
|
}
|
|
|
|
VAS_EBOOT_MOD_FINI(wrmsr)
|
|
{
|
|
VasEBoot_unregister_command (cmd_write);
|
|
}
|