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

M0203.c (3563B)

      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
     23 */
     24#include <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26#include <subdev/bios/M0203.h>
     27
     28u32
     29nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     30{
     31	struct bit_entry bit_M;
     32	u32 data = 0x00000000;
     33
     34	if (!bit_entry(bios, 'M', &bit_M)) {
     35		if (bit_M.version == 2 && bit_M.length > 0x04)
     36			data = nvbios_rd16(bios, bit_M.offset + 0x03);
     37		if (data) {
     38			*ver = nvbios_rd08(bios, data + 0x00);
     39			switch (*ver) {
     40			case 0x10:
     41				*hdr = nvbios_rd08(bios, data + 0x01);
     42				*len = nvbios_rd08(bios, data + 0x02);
     43				*cnt = nvbios_rd08(bios, data + 0x03);
     44				return data;
     45			default:
     46				break;
     47			}
     48		}
     49	}
     50
     51	return 0x00000000;
     52}
     53
     54u32
     55nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
     56	       struct nvbios_M0203T *info)
     57{
     58	u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
     59	memset(info, 0x00, sizeof(*info));
     60	switch (!!data * *ver) {
     61	case 0x10:
     62		info->type    = nvbios_rd08(bios, data + 0x04);
     63		info->pointer = nvbios_rd16(bios, data + 0x05);
     64		break;
     65	default:
     66		break;
     67	}
     68	return data;
     69}
     70
     71u32
     72nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
     73{
     74	u8  cnt, len;
     75	u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
     76	if (data && idx < cnt) {
     77		data = data + *hdr + idx * len;
     78		*hdr = len;
     79		return data;
     80	}
     81	return 0x00000000;
     82}
     83
     84u32
     85nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
     86	       struct nvbios_M0203E *info)
     87{
     88	u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
     89	memset(info, 0x00, sizeof(*info));
     90	switch (!!data * *ver) {
     91	case 0x10:
     92		info->type  = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
     93		info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
     94		info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
     95		return data;
     96	default:
     97		break;
     98	}
     99	return 0x00000000;
    100}
    101
    102u32
    103nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
    104	       struct nvbios_M0203E *info)
    105{
    106	struct nvkm_subdev *subdev = &bios->subdev;
    107	struct nvbios_M0203T M0203T;
    108	u8  cnt, len, idx = 0xff;
    109	u32 data;
    110
    111	if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
    112		nvkm_warn(subdev, "M0203T not found\n");
    113		return 0x00000000;
    114	}
    115
    116	while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
    117		switch (M0203T.type) {
    118		case M0203T_TYPE_RAMCFG:
    119			if (info->strap != ramcfg)
    120				continue;
    121			return data;
    122		default:
    123			nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
    124			return 0x00000000;
    125		}
    126	}
    127
    128	return data;
    129}