93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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/*
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* Common Option ROM Functions for fw_cfg
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (c) 2015-2019 Red Hat Inc.
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* Authors:
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* Marc Marí <marc.mari.barcelo@gmail.com>
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* Richard W.M. Jones <rjones@redhat.com>
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* Stefano Garzarella <sgarzare@redhat.com>
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*/
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#ifndef OPTROM_FW_CFG_H
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#define OPTROM_FW_CFG_H
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#include "../../include/standard-headers/linux/qemu_fw_cfg.h"
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#define BIOS_CFG_IOPORT_CFG 0x510
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#define BIOS_CFG_IOPORT_DATA 0x511
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#define BIOS_CFG_DMA_ADDR_HIGH 0x514
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#define BIOS_CFG_DMA_ADDR_LOW 0x518
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static __attribute__((unused))
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void bios_cfg_select(uint16_t key)
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{
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outw(key, BIOS_CFG_IOPORT_CFG);
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}
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static __attribute__((unused))
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void bios_cfg_read_entry_io(void *buf, uint16_t entry, uint32_t len)
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{
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bios_cfg_select(entry);
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insb(BIOS_CFG_IOPORT_DATA, buf, len);
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}
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/*
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* clang is happy to inline this function, and bloats the
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* ROM.
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*/
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static __attribute__((__noinline__)) __attribute__((unused))
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void bios_cfg_read_entry_dma(void *buf, uint16_t entry, uint32_t len)
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{
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struct fw_cfg_dma_access access;
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uint32_t control = (entry << 16) | FW_CFG_DMA_CTL_SELECT
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| FW_CFG_DMA_CTL_READ;
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access.address = cpu_to_be64((uint64_t)(uint32_t)buf);
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access.length = cpu_to_be32(len);
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access.control = cpu_to_be32(control);
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barrier();
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outl(cpu_to_be32((uint32_t)&access), BIOS_CFG_DMA_ADDR_LOW);
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while (be32_to_cpu(access.control) & ~FW_CFG_DMA_CTL_ERROR) {
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barrier();
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}
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}
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static __attribute__((unused))
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void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len,
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uint32_t version)
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{
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if (version & FW_CFG_VERSION_DMA) {
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bios_cfg_read_entry_dma(buf, entry, len);
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} else {
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bios_cfg_read_entry_io(buf, entry, len);
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}
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}
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static __attribute__((unused))
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uint32_t bios_cfg_version(void)
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{
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uint32_t version;
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bios_cfg_read_entry_io(&version, FW_CFG_ID, sizeof(version));
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return version;
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}
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#endif /* OPTROM_FW_CFG_H */
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