cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

optrom_fw_cfg.h (2622B)

      1/*
      2 * Common Option ROM Functions for fw_cfg
      3 *
      4 * This program is free software; you can redistribute it and/or modify
      5 * it under the terms of the GNU General Public License as published by
      6 * the Free Software Foundation; either version 2 of the License, or
      7 * (at your option) any later version.
      8 *
      9 * This program is distributed in the hope that it will be useful,
     10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     12 * GNU General Public License for more details.
     13 *
     14 * You should have received a copy of the GNU General Public License
     15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
     16 *
     17 * Copyright (c) 2015-2019 Red Hat Inc.
     18 *   Authors:
     19 *     Marc Marí <marc.mari.barcelo@gmail.com>
     20 *     Richard W.M. Jones <rjones@redhat.com>
     21 *     Stefano Garzarella <sgarzare@redhat.com>
     22 */
     23
     24#ifndef OPTROM_FW_CFG_H
     25#define OPTROM_FW_CFG_H
     26
     27#include "../../include/standard-headers/linux/qemu_fw_cfg.h"
     28
     29#define BIOS_CFG_IOPORT_CFG     0x510
     30#define BIOS_CFG_IOPORT_DATA    0x511
     31#define BIOS_CFG_DMA_ADDR_HIGH  0x514
     32#define BIOS_CFG_DMA_ADDR_LOW   0x518
     33
     34static __attribute__((unused))
     35void bios_cfg_select(uint16_t key)
     36{
     37    outw(key, BIOS_CFG_IOPORT_CFG);
     38}
     39
     40static __attribute__((unused))
     41void bios_cfg_read_entry_io(void *buf, uint16_t entry, uint32_t len)
     42{
     43    bios_cfg_select(entry);
     44    insb(BIOS_CFG_IOPORT_DATA, buf, len);
     45}
     46
     47/*
     48 * clang is happy to inline this function, and bloats the
     49 * ROM.
     50 */
     51static __attribute__((__noinline__)) __attribute__((unused))
     52void bios_cfg_read_entry_dma(void *buf, uint16_t entry, uint32_t len)
     53{
     54    struct fw_cfg_dma_access access;
     55    uint32_t control = (entry << 16) | FW_CFG_DMA_CTL_SELECT
     56                        | FW_CFG_DMA_CTL_READ;
     57
     58    access.address = cpu_to_be64((uint64_t)(uint32_t)buf);
     59    access.length = cpu_to_be32(len);
     60    access.control = cpu_to_be32(control);
     61
     62    barrier();
     63
     64    outl(cpu_to_be32((uint32_t)&access), BIOS_CFG_DMA_ADDR_LOW);
     65
     66    while (be32_to_cpu(access.control) & ~FW_CFG_DMA_CTL_ERROR) {
     67        barrier();
     68    }
     69}
     70
     71static __attribute__((unused))
     72void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len,
     73                         uint32_t version)
     74{
     75    if (version & FW_CFG_VERSION_DMA) {
     76        bios_cfg_read_entry_dma(buf, entry, len);
     77    } else {
     78        bios_cfg_read_entry_io(buf, entry, len);
     79    }
     80}
     81
     82static __attribute__((unused))
     83uint32_t bios_cfg_version(void)
     84{
     85    uint32_t version;
     86
     87    bios_cfg_read_entry_io(&version, FW_CFG_ID, sizeof(version));
     88
     89    return version;
     90}
     91
     92#endif /* OPTROM_FW_CFG_H */