92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* rdmsr.c - Read CPU model-specific registers. */
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/*
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* VAS_EBOOT -- GRand Unified Bootloader
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* Copyright (C) 2019 Free Software Foundation, Inc.
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* Based on gcc/gcc/config/i386/driver-i386.c
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*
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* VAS_EBOOT 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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* VAS_EBOOT 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 VAS_EBOOT. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <VasEBoot/dl.h>
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#include <VasEBoot/misc.h>
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#include <VasEBoot/mm.h>
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#include <VasEBoot/env.h>
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#include <VasEBoot/command.h>
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#include <VasEBoot/extcmd.h>
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#include <VasEBoot/i18n.h>
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#include <VasEBoot/i386/cpuid.h>
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#include <VasEBoot/i386/msr.h>
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VAS_EBOOT_MOD_LICENSE("GPLv3+");
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static VasEBoot_extcmd_t cmd_read;
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static const struct VasEBoot_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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N_("VARNAME"), ARG_TYPE_STRING},
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{0, 0, 0, 0, 0, 0}
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};
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static VasEBoot_err_t
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VasEBoot_cmd_msr_read (VasEBoot_extcmd_context_t ctxt, int argc, char **argv)
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{
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VasEBoot_err_t err;
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VasEBoot_uint32_t addr;
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VasEBoot_uint64_t value;
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const char *ptr;
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char buf[sizeof("1122334455667788")];
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err = VasEBoot_cpu_is_msr_supported ();
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if (err != VAS_EBOOT_ERR_NONE)
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return VasEBoot_error (err, N_("RDMSR is unsupported"));
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if (argc != 1)
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return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("one argument expected"));
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VasEBoot_errno = VAS_EBOOT_ERR_NONE;
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ptr = argv[0];
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addr = VasEBoot_strtoul (ptr, &ptr, 0);
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if (VasEBoot_errno != VAS_EBOOT_ERR_NONE)
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return VasEBoot_errno;
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if (*ptr != '\0')
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return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("invalid argument"));
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value = VasEBoot_rdmsr (addr);
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if (ctxt->state[0].set)
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{
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VasEBoot_snprintf (buf, sizeof(buf), "%llx", (unsigned long long) value);
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VasEBoot_env_set (ctxt->state[0].arg, buf);
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}
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else
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VasEBoot_printf ("0x%llx\n", (unsigned long long) value);
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return VAS_EBOOT_ERR_NONE;
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}
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VAS_EBOOT_MOD_INIT(rdmsr)
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{
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cmd_read = VasEBoot_register_extcmd ("rdmsr", VasEBoot_cmd_msr_read, 0, N_("ADDR"),
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N_("Read a CPU model specific register."),
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options);
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}
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VAS_EBOOT_MOD_FINI(rdmsr)
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{
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VasEBoot_unregister_extcmd (cmd_read);
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}
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