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hwaccess: move x86 port I/O related code into own files

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Allow port I/O related code to be compiled independent from memory
mapping functionality. This enables for a better selection of needed
hardware access types.

Change-Id: I372b4a409f036da766c42bc406b596bc41b0f75a
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/60110
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Thomas Heijligen
2021-12-14 16:36:05 +01:00
committed by Nico Huber
parent 88c871e74c
commit 49d758698a
31 changed files with 122 additions and 82 deletions
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87
hwaccess_x86_io.c Normal file
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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <errno.h>
#include <string.h>
#if !defined (__DJGPP__) && !defined(__LIBPAYLOAD__)
/* No file access needed/possible to get hardware access permissions. */
#include <unistd.h>
#include <fcntl.h>
#endif
#include "hwaccess_x86_io.h"
#include "flash.h"
#if USE_IOPERM
#include <sys/io.h>
#endif
#if USE_DEV_IO
int io_fd;
#endif
#if !(defined(__DJGPP__) || defined(__LIBPAYLOAD__))
static int release_io_perms(void *p)
{
#if defined (__sun)
sysi86(SI86V86, V86SC_IOPL, 0);
#elif USE_DEV_IO
close(io_fd);
#elif USE_IOPERM
ioperm(0, 65536, 0);
#elif USE_IOPL
iopl(0);
#endif
return 0;
}
/* Get I/O permissions with automatic permission release on shutdown. */
int rget_io_perms(void)
{
#if defined (__sun)
if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) != 0) {
#elif USE_DEV_IO
if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
#elif USE_IOPERM
if (ioperm(0, 65536, 1) != 0) {
#elif USE_IOPL
if (iopl(3) != 0) {
#endif
msg_perr("ERROR: Could not get I/O privileges (%s).\n", strerror(errno));
msg_perr("You need to be root.\n");
#if defined (__OpenBSD__)
msg_perr("If you are root already please set securelevel=-1 in /etc/rc.securelevel and\n"
"reboot, or reboot into single user mode.\n");
#elif defined(__NetBSD__)
msg_perr("If you are root already please reboot into single user mode or make sure\n"
"that your kernel configuration has the option INSECURE enabled.\n");
#endif
return 1;
} else {
register_shutdown(release_io_perms, NULL);
}
return 0;
}
#else
/* DJGPP and libpayload environments have full PCI port I/O permissions by default. */
/* PCI port I/O support is unimplemented on PPC/MIPS and unavailable on ARM. */
int rget_io_perms(void)
{
return 0;
}
#endif