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

ramcfg.c (2502B)

      1/*
      2 * Copyright 2013 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 <bskeggs@redhat.com>
     23 */
     24#include <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26#include <subdev/bios/ramcfg.h>
     27#include <subdev/bios/M0203.h>
     28
     29static u8
     30nvbios_ramcfg_strap(struct nvkm_subdev *subdev)
     31{
     32	return (nvkm_rd32(subdev->device, 0x101000) & 0x0000003c) >> 2;
     33}
     34
     35u8
     36nvbios_ramcfg_count(struct nvkm_bios *bios)
     37{
     38	struct bit_entry bit_M;
     39
     40	if (!bit_entry(bios, 'M', &bit_M)) {
     41		if (bit_M.version == 1 && bit_M.length >= 5)
     42			return nvbios_rd08(bios, bit_M.offset + 2);
     43		if (bit_M.version == 2 && bit_M.length >= 3)
     44			return nvbios_rd08(bios, bit_M.offset + 0);
     45	}
     46
     47	return 0x00;
     48}
     49
     50u8
     51nvbios_ramcfg_index(struct nvkm_subdev *subdev)
     52{
     53	struct nvkm_bios *bios = subdev->device->bios;
     54	u8 strap = nvbios_ramcfg_strap(subdev);
     55	u32 xlat = 0x00000000;
     56	struct bit_entry bit_M;
     57	struct nvbios_M0203E M0203E;
     58	u8 ver, hdr;
     59
     60	if (!bit_entry(bios, 'M', &bit_M)) {
     61		if (bit_M.version == 1 && bit_M.length >= 5)
     62			xlat = nvbios_rd16(bios, bit_M.offset + 3);
     63		if (bit_M.version == 2 && bit_M.length >= 3) {
     64			/*XXX: is M ever shorter than this?
     65			 *     if not - what is xlat used for now?
     66			 *     also - sigh..
     67			 */
     68			if (bit_M.length >= 7 &&
     69			    nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E))
     70				return M0203E.group;
     71			xlat = nvbios_rd16(bios, bit_M.offset + 1);
     72		}
     73	}
     74
     75	if (xlat)
     76		strap = nvbios_rd08(bios, xlat + strap);
     77	return strap;
     78}