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c4e582654a
It is useful to obtain the results of MSR queries as well as to update MSR registers, so add a command these tasks. Signed-off-by: Simon Glass <sjg@chromium.org>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'cpuid' command provides access to the CPU's cpuid information
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*
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* Copyright 2024 Google, LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <command.h>
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#include <vsprintf.h>
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#include <asm/msr.h>
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static int do_read(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct msr_t msr;
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ulong op;
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if (argc < 2)
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return CMD_RET_USAGE;
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op = hextoul(argv[1], NULL);
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msr = msr_read(op);
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printf("%08x %08x\n", msr.hi, msr.lo);
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return 0;
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}
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static int do_write(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct msr_t msr;
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ulong op;
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if (argc < 4)
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return CMD_RET_USAGE;
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op = hextoul(argv[1], NULL);
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msr.hi = hextoul(argv[2], NULL);
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msr.lo = hextoul(argv[3], NULL);
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msr_write(op, msr);
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return 0;
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}
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U_BOOT_LONGHELP(msr,
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"read <op> - read a machine-status register (MSR) as <hi 32-bits> <lo 32-bits>\n"
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"write <op< <hi> <lo> - write an MSR");
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U_BOOT_CMD_WITH_SUBCMDS(msr, "Machine Status Registers", msr_help_text,
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U_BOOT_CMD_MKENT(read, CONFIG_SYS_MAXARGS, 1, do_read, "", ""),
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U_BOOT_CMD_MKENT(write, CONFIG_SYS_MAXARGS, 1, do_write, "", ""));
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