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

dp.c (6321B)

      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 <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26#include <subdev/bios/dp.h>
     27
     28u16
     29nvbios_dp_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     30{
     31	struct bit_entry d;
     32
     33	if (!bit_entry(bios, 'd', &d)) {
     34		if (d.version == 1 && d.length >= 2) {
     35			u16 data = nvbios_rd16(bios, d.offset);
     36			if (data) {
     37				*ver = nvbios_rd08(bios, data + 0x00);
     38				switch (*ver) {
     39				case 0x20:
     40				case 0x21:
     41				case 0x30:
     42				case 0x40:
     43				case 0x41:
     44				case 0x42:
     45					*hdr = nvbios_rd08(bios, data + 0x01);
     46					*len = nvbios_rd08(bios, data + 0x02);
     47					*cnt = nvbios_rd08(bios, data + 0x03);
     48					return data;
     49				default:
     50					break;
     51				}
     52			}
     53		}
     54	}
     55
     56	return 0x0000;
     57}
     58
     59static u16
     60nvbios_dpout_entry(struct nvkm_bios *bios, u8 idx,
     61		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     62{
     63	u16 data = nvbios_dp_table(bios, ver, hdr, cnt, len);
     64	if (data && idx < *cnt) {
     65		u16 outp = nvbios_rd16(bios, data + *hdr + idx * *len);
     66		switch (*ver * !!outp) {
     67		case 0x20:
     68		case 0x21:
     69		case 0x30:
     70			*hdr = nvbios_rd08(bios, data + 0x04);
     71			*len = nvbios_rd08(bios, data + 0x05);
     72			*cnt = nvbios_rd08(bios, outp + 0x04);
     73			break;
     74		case 0x40:
     75		case 0x41:
     76		case 0x42:
     77			*hdr = nvbios_rd08(bios, data + 0x04);
     78			*cnt = 0;
     79			*len = 0;
     80			break;
     81		default:
     82			break;
     83		}
     84		return outp;
     85	}
     86	*ver = 0x00;
     87	return 0x0000;
     88}
     89
     90u16
     91nvbios_dpout_parse(struct nvkm_bios *bios, u8 idx,
     92		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
     93		   struct nvbios_dpout *info)
     94{
     95	u16 data = nvbios_dpout_entry(bios, idx, ver, hdr, cnt, len);
     96	memset(info, 0x00, sizeof(*info));
     97	if (data && *ver) {
     98		info->type = nvbios_rd16(bios, data + 0x00);
     99		info->mask = nvbios_rd16(bios, data + 0x02);
    100		switch (*ver) {
    101		case 0x20:
    102			info->mask |= 0x00c0; /* match any link */
    103			fallthrough;
    104		case 0x21:
    105		case 0x30:
    106			info->flags     = nvbios_rd08(bios, data + 0x05);
    107			info->script[0] = nvbios_rd16(bios, data + 0x06);
    108			info->script[1] = nvbios_rd16(bios, data + 0x08);
    109			if (*len >= 0x0c)
    110				info->lnkcmp    = nvbios_rd16(bios, data + 0x0a);
    111			if (*len >= 0x0f) {
    112				info->script[2] = nvbios_rd16(bios, data + 0x0c);
    113				info->script[3] = nvbios_rd16(bios, data + 0x0e);
    114			}
    115			if (*len >= 0x11)
    116				info->script[4] = nvbios_rd16(bios, data + 0x10);
    117			break;
    118		case 0x40:
    119		case 0x41:
    120		case 0x42:
    121			info->flags     = nvbios_rd08(bios, data + 0x04);
    122			info->script[0] = nvbios_rd16(bios, data + 0x05);
    123			info->script[1] = nvbios_rd16(bios, data + 0x07);
    124			info->lnkcmp    = nvbios_rd16(bios, data + 0x09);
    125			info->script[2] = nvbios_rd16(bios, data + 0x0b);
    126			info->script[3] = nvbios_rd16(bios, data + 0x0d);
    127			info->script[4] = nvbios_rd16(bios, data + 0x0f);
    128			break;
    129		default:
    130			data = 0x0000;
    131			break;
    132		}
    133	}
    134	return data;
    135}
    136
    137u16
    138nvbios_dpout_match(struct nvkm_bios *bios, u16 type, u16 mask,
    139		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
    140		   struct nvbios_dpout *info)
    141{
    142	u16 data, idx = 0;
    143	while ((data = nvbios_dpout_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
    144		if (data && info->type == type) {
    145			if ((info->mask & mask) == mask)
    146				break;
    147		}
    148	}
    149	return data;
    150}
    151
    152static u16
    153nvbios_dpcfg_entry(struct nvkm_bios *bios, u16 outp, u8 idx,
    154		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
    155{
    156	if (*ver >= 0x40) {
    157		outp = nvbios_dp_table(bios, ver, hdr, cnt, len);
    158		*hdr = *hdr + (*len * * cnt);
    159		*len = nvbios_rd08(bios, outp + 0x06);
    160		*cnt = nvbios_rd08(bios, outp + 0x07) *
    161		       nvbios_rd08(bios, outp + 0x05);
    162	}
    163
    164	if (idx < *cnt)
    165		return outp + *hdr + (idx * *len);
    166
    167	return 0x0000;
    168}
    169
    170u16
    171nvbios_dpcfg_parse(struct nvkm_bios *bios, u16 outp, u8 idx,
    172		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
    173		   struct nvbios_dpcfg *info)
    174{
    175	u16 data = nvbios_dpcfg_entry(bios, outp, idx, ver, hdr, cnt, len);
    176	memset(info, 0x00, sizeof(*info));
    177	if (data) {
    178		switch (*ver) {
    179		case 0x20:
    180		case 0x21:
    181			info->dc    = nvbios_rd08(bios, data + 0x02);
    182			info->pe    = nvbios_rd08(bios, data + 0x03);
    183			info->tx_pu = nvbios_rd08(bios, data + 0x04);
    184			break;
    185		case 0x30:
    186		case 0x40:
    187		case 0x41:
    188			info->pc    = nvbios_rd08(bios, data + 0x00);
    189			info->dc    = nvbios_rd08(bios, data + 0x01);
    190			info->pe    = nvbios_rd08(bios, data + 0x02);
    191			info->tx_pu = nvbios_rd08(bios, data + 0x03);
    192			break;
    193		case 0x42:
    194			info->dc    = nvbios_rd08(bios, data + 0x00);
    195			info->pe    = nvbios_rd08(bios, data + 0x01);
    196			info->tx_pu = nvbios_rd08(bios, data + 0x02);
    197			break;
    198		default:
    199			data = 0x0000;
    200			break;
    201		}
    202	}
    203	return data;
    204}
    205
    206u16
    207nvbios_dpcfg_match(struct nvkm_bios *bios, u16 outp, u8 pc, u8 vs, u8 pe,
    208		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
    209		   struct nvbios_dpcfg *info)
    210{
    211	u8 idx = 0xff;
    212	u16 data;
    213
    214	if (*ver >= 0x30) {
    215		static const u8 vsoff[] = { 0, 4, 7, 9 };
    216		idx = (pc * 10) + vsoff[vs] + pe;
    217		if (*ver >= 0x40 && *ver <= 0x41 && *hdr >= 0x12)
    218			idx += nvbios_rd08(bios, outp + 0x11) * 40;
    219		else
    220		if (*ver >= 0x42)
    221			idx += nvbios_rd08(bios, outp + 0x11) * 10;
    222	} else {
    223		while ((data = nvbios_dpcfg_entry(bios, outp, ++idx,
    224						  ver, hdr, cnt, len))) {
    225			if (nvbios_rd08(bios, data + 0x00) == vs &&
    226			    nvbios_rd08(bios, data + 0x01) == pe)
    227				break;
    228		}
    229	}
    230
    231	return nvbios_dpcfg_parse(bios, outp, idx, ver, hdr, cnt, len, info);
    232}