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/*
* (C) Copyright IBM Corporation 2007
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file linux_devmem.c
* Access PCI subsystem using Linux's the old /dev/mem interface.
*
* \note
* This is currently just a skeleton. It only includes the /dev/mem based
* function for reading the device ROM.
*
* \author Ian Romanick <idr@us.ibm.com>
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <dirent.h>
#include <errno.h>
#include "pciaccess.h"
#include "pciaccess_private.h"
#include "linux_devmem.h"
/**
* Read a device's expansion ROM using /dev/mem.
*
* \note
* This function could probably be used, as-is, on other platforms that have
* a /dev/mem interface.
*
* \bugs
* Before using the VGA special case code, this function should check that
* VGA access are routed to the device. Right?
*/
_pci_hidden int
pci_device_linux_devmem_read_rom(struct pci_device *dev, void *buffer)
{
struct pci_device_private *priv = (struct pci_device_private *) dev;
int fd;
int err = 0;
uint32_t rom_base_tmp;
pciaddr_t rom_base;
pciaddr_t rom_size;
int PCI_ROM;
/* Handle some special cases of legacy devices.
*/
if (priv->base.rom_size == 0) {
/* VGA ROMs are supposed to be at 0xC0000.
*/
if ((priv->base.device_class & 0x00ffff00) == 0x000030000) {
rom_base = 0x000C0000;
rom_size = 0x00010000;
PCI_ROM = 0;
}
else {
/* "Function not implemented."
*/
return ENOSYS;
}
}
else {
rom_base = priv->rom_base;
rom_size = priv->base.rom_size;
PCI_ROM = 1;
}
/* Enable the device's ROM.
*/
if (PCI_ROM) {
err = pci_device_cfg_read_u32(& priv->base, & rom_base_tmp, 48);
if (err) {
return err;
}
if ((rom_base_tmp & 0x000000001) == 0) {
err = pci_device_cfg_write_u32(& priv->base,
rom_base_tmp | 1, 48);
if (err) {
return err;
}
}
}
/* Read the portion of /dev/mem that corresponds to the device's ROM.
*/
fd = open("/dev/mem", O_RDONLY, 0);
if (fd < 0) {
err = errno;
}
else {
size_t bytes;
for (bytes = 0; bytes < rom_size; /* empty */) {
const ssize_t got = pread(fd, buffer, rom_size - bytes,
rom_base + bytes);
if (got == -1) {
err = errno;
break;
}
bytes += got;
}
close(fd);
}
/* Disable the device's ROM.
*/
if (PCI_ROM && ((rom_base_tmp & 0x000000001) == 0)) {
const int tmp_err = pci_device_cfg_write_u32(& priv->base,
rom_base_tmp, 48);
/* Prefer to return the first error that occurred.
*/
if (err == 0) {
err = tmp_err;
}
}
return err;
}
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