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

base.c (5302B)


      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 "priv.h"
     25
     26#include <subdev/bios.h>
     27#include <subdev/bios/bmp.h>
     28#include <subdev/bios/bit.h>
     29#include <subdev/bios/image.h>
     30
     31static bool
     32nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size)
     33{
     34	u32 p = *addr;
     35
     36	if (*addr > bios->image0_size && bios->imaged_addr) {
     37		*addr -= bios->image0_size;
     38		*addr += bios->imaged_addr;
     39	}
     40
     41	if (unlikely(*addr + size > bios->size)) {
     42		nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr);
     43		return false;
     44	}
     45
     46	return true;
     47}
     48
     49u8
     50nvbios_rd08(struct nvkm_bios *bios, u32 addr)
     51{
     52	if (likely(nvbios_addr(bios, &addr, 1)))
     53		return bios->data[addr];
     54	return 0x00;
     55}
     56
     57u16
     58nvbios_rd16(struct nvkm_bios *bios, u32 addr)
     59{
     60	if (likely(nvbios_addr(bios, &addr, 2)))
     61		return get_unaligned_le16(&bios->data[addr]);
     62	return 0x0000;
     63}
     64
     65u32
     66nvbios_rd32(struct nvkm_bios *bios, u32 addr)
     67{
     68	if (likely(nvbios_addr(bios, &addr, 4)))
     69		return get_unaligned_le32(&bios->data[addr]);
     70	return 0x00000000;
     71}
     72
     73u8
     74nvbios_checksum(const u8 *data, int size)
     75{
     76	u8 sum = 0;
     77	while (size--)
     78		sum += *data++;
     79	return sum;
     80}
     81
     82u16
     83nvbios_findstr(const u8 *data, int size, const char *str, int len)
     84{
     85	int i, j;
     86
     87	for (i = 0; i <= (size - len); i++) {
     88		for (j = 0; j < len; j++)
     89			if ((char)data[i + j] != str[j])
     90				break;
     91		if (j == len)
     92			return i;
     93	}
     94
     95	return 0;
     96}
     97
     98int
     99nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len)
    100{
    101	unsigned char c1, c2;
    102
    103	while (len--) {
    104		c1 = nvbios_rd08(bios, addr++);
    105		c2 = *(str++);
    106		if (c1 != c2)
    107			return c1 - c2;
    108	}
    109	return 0;
    110}
    111
    112int
    113nvbios_extend(struct nvkm_bios *bios, u32 length)
    114{
    115	if (bios->size < length) {
    116		u8 *prev = bios->data;
    117		if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
    118			bios->data = prev;
    119			return -ENOMEM;
    120		}
    121		memcpy(bios->data, prev, bios->size);
    122		bios->size = length;
    123		kfree(prev);
    124		return 1;
    125	}
    126	return 0;
    127}
    128
    129static void *
    130nvkm_bios_dtor(struct nvkm_subdev *subdev)
    131{
    132	struct nvkm_bios *bios = nvkm_bios(subdev);
    133	kfree(bios->data);
    134	return bios;
    135}
    136
    137static const struct nvkm_subdev_func
    138nvkm_bios = {
    139	.dtor = nvkm_bios_dtor,
    140};
    141
    142int
    143nvkm_bios_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
    144	      struct nvkm_bios **pbios)
    145{
    146	struct nvkm_bios *bios;
    147	struct nvbios_image image;
    148	struct bit_entry bit_i;
    149	int ret, idx = 0;
    150
    151	if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL)))
    152		return -ENOMEM;
    153	nvkm_subdev_ctor(&nvkm_bios, device, type, inst, &bios->subdev);
    154
    155	ret = nvbios_shadow(bios);
    156	if (ret)
    157		return ret;
    158
    159	/* Some tables have weird pointers that need adjustment before
    160	 * they're dereferenced.  I'm not entirely sure why...
    161	 */
    162	if (nvbios_image(bios, idx++, &image)) {
    163		bios->image0_size = image.size;
    164		while (nvbios_image(bios, idx++, &image)) {
    165			if (image.type == 0xe0) {
    166				bios->imaged_addr = image.base;
    167				break;
    168			}
    169		}
    170	}
    171
    172	/* detect type of vbios we're dealing with */
    173	bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
    174					  "\xff\x7f""NV\0", 5);
    175	if (bios->bmp_offset) {
    176		nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
    177			   bmp_version(bios) >> 8,
    178			   bmp_version(bios) & 0xff);
    179	}
    180
    181	bios->bit_offset = nvbios_findstr(bios->data, bios->size,
    182					  "\xff\xb8""BIT", 5);
    183	if (bios->bit_offset)
    184		nvkm_debug(&bios->subdev, "BIT signature found\n");
    185
    186	/* determine the vbios version number */
    187	if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
    188		bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
    189		bios->version.chip  = nvbios_rd08(bios, bit_i.offset + 2);
    190		bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
    191		bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
    192		bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
    193	} else
    194	if (bmp_version(bios)) {
    195		bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
    196		bios->version.chip  = nvbios_rd08(bios, bios->bmp_offset + 12);
    197		bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
    198		bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
    199	}
    200
    201	nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
    202		  bios->version.major, bios->version.chip,
    203		  bios->version.minor, bios->version.micro, bios->version.patch);
    204	return 0;
    205}