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

image.c (2511B)

      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/image.h>
     26#include <subdev/bios/pcir.h>
     27#include <subdev/bios/npde.h>
     28
     29static bool
     30nvbios_imagen(struct nvkm_bios *bios, struct nvbios_image *image)
     31{
     32	struct nvkm_subdev *subdev = &bios->subdev;
     33	struct nvbios_pcirT pcir;
     34	struct nvbios_npdeT npde;
     35	u8  ver;
     36	u16 hdr;
     37	u32 data;
     38
     39	switch ((data = nvbios_rd16(bios, image->base + 0x00))) {
     40	case 0xaa55:
     41	case 0xbb77:
     42	case 0x4e56: /* NV */
     43		break;
     44	default:
     45		nvkm_debug(subdev, "%08x: ROM signature (%04x) unknown\n",
     46			   image->base, data);
     47		return false;
     48	}
     49
     50	if (!(data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir)))
     51		return false;
     52	image->size = pcir.image_size;
     53	image->type = pcir.image_type;
     54	image->last = pcir.last;
     55
     56	if (image->type != 0x70) {
     57		if (!(data = nvbios_npdeTp(bios, image->base, &npde)))
     58			return true;
     59		image->size = npde.image_size;
     60		image->last = npde.last;
     61	} else {
     62		image->last = true;
     63	}
     64
     65	return true;
     66}
     67
     68bool
     69nvbios_image(struct nvkm_bios *bios, int idx, struct nvbios_image *image)
     70{
     71	u32 imaged_addr = bios->imaged_addr;
     72	memset(image, 0x00, sizeof(*image));
     73	bios->imaged_addr = 0;
     74	do {
     75		image->base += image->size;
     76		if (image->last || !nvbios_imagen(bios, image)) {
     77			bios->imaged_addr = imaged_addr;
     78			return false;
     79		}
     80	} while(idx--);
     81	bios->imaged_addr = imaged_addr;
     82	return true;
     83}