cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

bit.c (1781B)

      1/*
      2 * Copyright 2012 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Ben Skeggs
     23 */
     24#include <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26
     27int
     28bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit)
     29{
     30	if (likely(bios->bit_offset)) {
     31		u8  entries = nvbios_rd08(bios, bios->bit_offset + 10);
     32		u32 entry   = bios->bit_offset + 12;
     33		while (entries--) {
     34			if (nvbios_rd08(bios, entry + 0) == id) {
     35				bit->id      = nvbios_rd08(bios, entry + 0);
     36				bit->version = nvbios_rd08(bios, entry + 1);
     37				bit->length  = nvbios_rd16(bios, entry + 2);
     38				bit->offset  = nvbios_rd16(bios, entry + 4);
     39				return 0;
     40			}
     41
     42			entry += nvbios_rd08(bios, bios->bit_offset + 9);
     43		}
     44
     45		return -ENOENT;
     46	}
     47
     48	return -EINVAL;
     49}