mirror of
https://review.coreboot.org/flashrom.git
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30d1b5a107
Recently Android Bionic LibC got sys/io.h. Use this header to access ioperm(). Use Assembly for I/O, as Bionic does not have inb(), outb(), etc. Tested on Android 14 by adding flashrom and pciutils as external repositories, adding Android.bp blueprints (Android specialized build system - Soong), building, running and accessing (read, erase, write) SPI flash on x86 device. Change-Id: Id80b83c2718679c925ed6ddfe33cbe837eea0429 Signed-off-by: Jakub Czapiga <czapiga@google.com> Reviewed-on: https://review.coreboot.org/c/flashrom/+/83133 Reviewed-by: Peter Marheine <pmarheine@chromium.org> Reviewed-by: Hsuan-ting Chen <roccochen@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
430 lines
8.9 KiB
C
430 lines
8.9 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
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* Copyright (C) 2022 secunet Security Networks AG
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* (Written by Thomas Heijligen <thomas.heijligen@secunet.com)
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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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/*
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* This file implements x86 I/O port permission and access handling.
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*
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* The first part of the file defines the platform dependend implementations to
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* use on each platform. For getting I/O permissions set IO_PORT_PERMISSION to
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* one of:
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* - USE_DUMMY
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* - USE_SUN
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* - USE_DEVICE
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* - USE_IOPERM
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* - USE_IOPL
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* For the IN[B/W/L] and OUT[B/W/L] functions set IO_PORT_FUNCTION to one of:
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* - USE_LIBC_TARGET_LAST
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* - USE_LIBC_TARGET_FIRST
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* - USE_DOS
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* - USE_ASM
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*
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* The platform specific code for getting I/O permissions consists of two
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* functions. `platform_get_io_perms()` is called to get
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* permissions and `platform_release_io_perms()` is called for releasing those.
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*/
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#include <errno.h>
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#include <string.h>
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#include "flash.h"
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#include "hwaccess_x86_io.h"
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/* IO_PORT_FUNCTION */
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#define USE_LIBC_TARGET_LAST 1
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#define USE_LIBC_TARGET_FIRST 2
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#define USE_ASM 3
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#define USE_DOS 4
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/* IO_PORT_PERMISSION */
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#define USE_IOPL 5
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#define USE_DEVICE 6
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#define USE_DUMMY 7
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#define USE_SUN 8
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#define USE_IOPERM 9
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#if defined(__ANDROID__)
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#include <sys/io.h>
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#include <unistd.h>
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#define IO_PORT_PERMISSION USE_IOPERM
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#define IO_PORT_FUNCTION USE_ASM
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#endif
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#if defined(__linux__) && !defined(__ANDROID__)
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#include <sys/io.h>
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#include <unistd.h>
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#define IO_PORT_PERMISSION USE_IOPL
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_LAST
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#endif
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#if defined(__FreeBSD_kernel) && defined(__GLIBC__)
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#include <sys/io.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define IO_PORT_PERMISSION USE_DEVICE
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_LAST
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#endif
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#if defined(__FreeBSD__) || defined(__DragonFly__)
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define IO_PORT_PERMISSION USE_DEVICE
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_FIRST
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#endif
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#if defined(__NetBSD__)
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#include <sys/types.h>
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#include <machine/sysarch.h>
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#if defined(__i386__)
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#define iopl i386_iopl
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#elif defined(__x86_64__)
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#define iopl x86_64_iopl
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#endif
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#define IO_PORT_PERMISSION USE_IOPL
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#define IO_PORT_FUNCTION USE_ASM
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#endif
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#if defined(__OpenBSD__)
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#include <sys/types.h>
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#include <machine/sysarch.h>
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#if defined(__i386__)
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#define iopl i386_iopl
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#elif defined(__amd64__)
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#define iopl amd64_iopl
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#endif
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#define IO_PORT_PERMISSION USE_IOPL
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#define IO_PORT_FUNCTION USE_ASM
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#endif
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#if defined(__MACH__) && defined(__APPLE__)
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#include <DirectHW/DirectHW.h>
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#define IO_PORT_PERMISSION USE_IOPL
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_LAST
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#endif
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#if defined(__DJGPP__)
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#include <pc.h>
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#define IO_PORT_PERMISSION USE_DUMMY
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#define IO_PORT_FUNCTION USE_DOS
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#endif
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#if defined(__LIBPAYLOAD__)
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#include <arch/io.h>
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#define IO_PORT_PERMISSION USE_DUMMY
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_LAST
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#endif
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#if defined(__sun)
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#include <sys/sysi86.h>
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#include <sys/psw.h>
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#include <asm/sunddi.h>
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#define IO_PORT_PERMISSION USE_SUN
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_FIRST
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#endif
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#if defined(__gnu_hurd__)
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#include <sys/io.h>
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#define IO_PORT_PERMISSION USE_IOPERM
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#define IO_PORT_FUNCTION USE_LIBC_TARGET_LAST
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#endif
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/* Make sure IO_PORT_PERMISSION and IO_PORT_FUNCTION are set */
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#if IO_PORT_PERMISSION == 0 || IO_PORT_FUNCTION == 0
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#error Unsupported or misconfigured platform.
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#endif
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/*
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* USE_DUMMY
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* This is for platforms which have no privilege levels.
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*/
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#if IO_PORT_PERMISSION == USE_DUMMY
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static int platform_get_io_perms(void)
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{
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return 0;
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}
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static int platform_release_io_perms(void *p)
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{
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return 0;
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}
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#endif
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/*
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* USE_SUN
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* This implementation uses SunOS system call sysi86 to handle I/O port permissions.
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*/
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#if IO_PORT_PERMISSION == USE_SUN
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static int platform_get_io_perms(void)
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{
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return sysi86(SI86V86, V86SC_IOPL, PS_IOPL);
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}
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static int platform_release_io_perms(void *p)
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{
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sysi86(SI86V86, V86SC_IOPL, 0);
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return 0;
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}
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#endif
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/*
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* USE_DEVICE
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* This implementation uses the virtual /dev/io file to handle I/O Port permissions.
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*/
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#if IO_PORT_PERMISSION == USE_DEVICE
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int io_fd;
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static int platform_get_io_perms(void)
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{
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io_fd = open("/dev/io", O_RDWR);
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return (io_fd >= 0 ? 0 : -1);
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}
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static int platform_release_io_perms(void *p)
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{
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close(io_fd);
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return 0;
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}
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#endif
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/*
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* USE_IOPERM
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* This implementation uses the ioperm system call to handle I/O port permissions.
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*/
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#if IO_PORT_PERMISSION == USE_IOPERM
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static int platform_get_io_perms(void)
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{
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return ioperm(0, 65536, 1);
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}
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static int platform_release_io_perms(void *p)
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{
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ioperm(0, 65536, 0);
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return 0;
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}
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#endif
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/*
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* USE_IOPL
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* This implementation uses the iopl system call to handle I/O port permissions.
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*/
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#if IO_PORT_PERMISSION == USE_IOPL
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static int platform_get_io_perms(void)
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{
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return iopl(3);
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}
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static int platform_release_io_perms(void *p)
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{
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iopl(0);
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return 0;
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}
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#endif
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/**
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* @brief Get access to the x86 I/O ports
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*
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* This function abstracts the platform dependent function to get access to the
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* x86 I/O ports and musst be called before using IN[B/W/L] or OUT[B/W/L].
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* It registers a shutdown function to release those privileges.
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*
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* @return 0 on success, platform specific number on failure
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*/
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int rget_io_perms(void)
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{
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if (platform_get_io_perms() == 0) {
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register_shutdown(platform_release_io_perms, NULL);
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return 0;
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}
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msg_perr("ERROR: Could not get I/O privileges (%s).\n", strerror(errno));
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#if defined(__linux__) && !defined(__ANDROID__)
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if (getuid() != 0) {
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msg_perr("Make sure you are running flashrom with root privileges.\n");
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} else {
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msg_perr("Your kernel may prevent access based on security policies.\n"
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"Issue a 'dmesg | grep flashrom' for further information\n");
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}
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#elif defined(__OpenBSD__)
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msg_perr("On OpenBSD set securelevel=-1 in /etc/rc.securelevel and\n"
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"reboot, or reboot into single user mode.\n");
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#elif defined(__NetBSD__)
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msg_perr("On NetBSD reboot into single user mode or make sure\n"
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"that your kernel configuration has the option INSECURE enabled.\n");
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#else
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msg_perr("Make sure you are running flashrom with root privileges.\n");
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#endif
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return 1;
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}
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/*
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* USE_LIBC_LAST
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* This implementation wraps the glibc functions with the port as 2nd argument.
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*/
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#if IO_PORT_FUNCTION == USE_LIBC_TARGET_LAST
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void OUTB(uint8_t value, uint16_t port)
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{
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outb(value, port);
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}
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void OUTW(uint16_t value, uint16_t port)
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{
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outw(value, port);
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}
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void OUTL(uint32_t value, uint16_t port)
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{
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outl(value, port);
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}
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#endif
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/*
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* USE_LIBC_FIRST
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* This implementation uses libc based functions with the port as first argument
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* like on BSDs.
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*/
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#if IO_PORT_FUNCTION == USE_LIBC_TARGET_FIRST
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void OUTB(uint8_t value, uint16_t port)
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{
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outb(port, value);
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}
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void OUTW(uint16_t value, uint16_t port)
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{
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outw(port, value);
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}
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void OUTL(uint32_t value, uint16_t port)
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{
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outl(port, value);
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}
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#endif
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/*
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* LIBC_xxx
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* INx functions can be shared between _LAST and _FIRST
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*/
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#if IO_PORT_FUNCTION == USE_LIBC_TARGET_LAST || IO_PORT_FUNCTION == USE_LIBC_TARGET_FIRST
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uint8_t INB(uint16_t port)
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{
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return inb(port);
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}
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uint16_t INW(uint16_t port)
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{
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return inw(port);
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}
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uint32_t INL(uint16_t port)
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{
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return inl(port);
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}
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#endif
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/*
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* USE_DOS
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* DOS provides the functions under a differnt name.
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*/
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#if IO_PORT_FUNCTION == USE_DOS
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void OUTB(uint8_t value, uint16_t port)
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{
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outportb(port, value);
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}
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void OUTW(uint16_t value, uint16_t port)
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{
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outportw(port, value);
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}
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void OUTL(uint32_t value, uint16_t port)
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{
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outportl(port, value);
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}
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uint8_t INB(uint16_t port)
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{
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return inportb(port);
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}
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uint16_t INW(uint16_t port)
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{
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return inportw(port);
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}
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uint32_t INL(uint16_t port)
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{
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return inportl(port);
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}
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#endif
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/*
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* USE_ASM
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* Pure assembly implementation.
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*/
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#if IO_PORT_FUNCTION == USE_ASM
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void OUTB(uint8_t value, uint16_t port)
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{
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__asm__ volatile ("outb %b0,%w1": :"a" (value), "Nd" (port));
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}
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void OUTW(uint16_t value, uint16_t port)
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{
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__asm__ volatile ("outw %w0,%w1": :"a" (value), "Nd" (port));
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}
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void OUTL(uint32_t value, uint16_t port)
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{
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__asm__ volatile ("outl %0,%w1": :"a" (value), "Nd" (port));
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}
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uint8_t INB(uint16_t port)
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{
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uint8_t value;
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__asm__ volatile ("inb %w1,%0":"=a" (value):"Nd" (port));
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return value;
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}
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uint16_t INW(uint16_t port)
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{
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uint16_t value;
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__asm__ volatile ("inw %w1,%0":"=a" (value):"Nd" (port));
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return value;
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}
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uint32_t INL(uint16_t port)
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{
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uint32_t value;
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__asm__ volatile ("inl %1,%0":"=a" (value):"Nd" (port));
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return value;
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}
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#endif
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