From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- include/grub/i386/wrmsr.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 include/grub/i386/wrmsr.h (limited to 'include/grub/i386/wrmsr.h') diff --git a/include/grub/i386/wrmsr.h b/include/grub/i386/wrmsr.h new file mode 100644 index 0000000..dea60ae --- /dev/null +++ b/include/grub/i386/wrmsr.h @@ -0,0 +1,35 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2019 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 . + */ + +#ifndef GRUB_WRMSR_H +#define GRUB_WRMSR_H 1 + +/* + * TODO: Add a general protection exception handler. + * Accessing a reserved or unimplemented MSR address results in a GP#. + */ + +static inline void +grub_msr_write(grub_uint32_t msr_id, grub_uint64_t msr_value) +{ + grub_uint32_t low = msr_value, high = msr_value >> 32; + + asm volatile ("wrmsr" : : "c" (msr_id), "a" (low), "d" (high)); +} + +#endif /* GRUB_WRMSR_H */ -- cgit v1.2.3