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

xpio.c (2521B)

      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/gpio.h>
     26#include <subdev/bios/xpio.h>
     27
     28static u16
     29dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     30{
     31	u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
     32	if (data && *ver >= 0x40 && *hdr >= 0x06) {
     33		u16 xpio = nvbios_rd16(bios, data + 0x04);
     34		if (xpio) {
     35			*ver = nvbios_rd08(bios, data + 0x00);
     36			*hdr = nvbios_rd08(bios, data + 0x01);
     37			*cnt = nvbios_rd08(bios, data + 0x02);
     38			*len = nvbios_rd08(bios, data + 0x03);
     39			return xpio;
     40		}
     41	}
     42	return 0x0000;
     43}
     44
     45u16
     46dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
     47	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     48{
     49	u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
     50	if (data && idx < *cnt) {
     51		u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len));
     52		if (xpio) {
     53			*ver = nvbios_rd08(bios, data + 0x00);
     54			*hdr = nvbios_rd08(bios, data + 0x01);
     55			*cnt = nvbios_rd08(bios, data + 0x02);
     56			*len = nvbios_rd08(bios, data + 0x03);
     57			return xpio;
     58		}
     59	}
     60	return 0x0000;
     61}
     62
     63u16
     64dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
     65	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
     66{
     67	u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
     68	if (data && *len >= 6) {
     69		info->type = nvbios_rd08(bios, data + 0x04);
     70		info->addr = nvbios_rd08(bios, data + 0x05);
     71		info->flags = nvbios_rd08(bios, data + 0x06);
     72	}
     73	return 0x0000;
     74}