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

npde.c (2024B)

      1/*
      2 * Copyright 2014 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/npde.h>
     26#include <subdev/bios/pcir.h>
     27
     28u32
     29nvbios_npdeTe(struct nvkm_bios *bios, u32 base)
     30{
     31	struct nvbios_pcirT pcir;
     32	u8  ver; u16 hdr;
     33	u32 data = nvbios_pcirTp(bios, base, &ver, &hdr, &pcir);
     34	if (data = (data + hdr + 0x0f) & ~0x0f, data) {
     35		switch (nvbios_rd32(bios, data + 0x00)) {
     36		case 0x4544504e: /* NPDE */
     37			break;
     38		default:
     39			nvkm_debug(&bios->subdev,
     40				   "%08x: NPDE signature (%08x) unknown\n",
     41				   data, nvbios_rd32(bios, data + 0x00));
     42			data = 0;
     43			break;
     44		}
     45	}
     46	return data;
     47}
     48
     49u32
     50nvbios_npdeTp(struct nvkm_bios *bios, u32 base, struct nvbios_npdeT *info)
     51{
     52	u32 data = nvbios_npdeTe(bios, base);
     53	memset(info, 0x00, sizeof(*info));
     54	if (data) {
     55		info->image_size = nvbios_rd16(bios, data + 0x08) * 512;
     56		info->last = nvbios_rd08(bios, data + 0x0a) & 0x80;
     57	}
     58	return data;
     59}