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

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>

1 files changed, 87 insertions, 0 deletions

diff --git a/hwaccess_x86_io.c b/hwaccess_x86_io.c
new file mode 100644
index 000000000..3152bfe51
--- /dev/null
+++ b/hwaccess_x86_io.c
@@ -0,0 +1,87 @@
+/*
+ * 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