hwaccess.h: Split hwaccess.h and extract hwaccess_x86_io.h out of it

The change makes it possible to mock functions from hwaccess_x86_io.h
in tests by replacing this header with a different one when built
for a test environment. The rest of hwaccess.h is fine and works
for the test environment.

BUG=b:181803212
TEST=make clean && make CONFIG_EVERYTHING=yes VERSION=none
Build flashrom before and after this patch, flashrom binary
is the same (diff flashrom_before flashrom_after shows no diffs)

Change-Id: Idd04c7b36b24e9da339348a015df4f43a03744f7
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/52499
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/hwaccess_x86_io.h b/hwaccess_x86_io.h
new file mode 100644
index 0000000..63692b8
--- /dev/null
+++ b/hwaccess_x86_io.h
@@ -0,0 +1,156 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2009 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef __HWACCESS_X86_IO_H__
+#define __HWACCESS_X86_IO_H__ 1
+
+/* sys/io.h provides iopl(2) and x86 I/O port access functions (inb, outb etc).
+ * It is included in glibc (thus available also on debian/kFreeBSD) but also in other libcs that mimic glibc,
+ * e.g. musl and uclibc. Because we cannot detect the libc or existence of the header or of the instructions
+ * themselves safely in here we use some heuristic below:
+ * On Android we don't have the header file and no way for I/O port access at all. However, sys/glibc-syscalls.h
+ * refers to an iopl implementation and we therefore include at least that one for now. On non-Android we assume
+ * that a Linux system's libc has a suitable sys/io.h or (on non-Linux) we depend on glibc to offer it. */
+#if defined(__ANDROID__)
+#include <sys/glibc-syscalls.h>
+#elif defined(__linux__) || defined(__GLIBC__)
+#include <sys/io.h>
+#endif
+
+#define __FLASHROM_HAVE_OUTB__ 1
+
+/* for iopl and outb under Solaris */
+#if defined (__sun)
+#include <sys/sysi86.h>
+#include <sys/psw.h>
+#include <asm/sunddi.h>
+#endif
+
+/* Clarification about OUTB/OUTW/OUTL argument order:
+ * OUT[BWL](val, port)
+ */
+
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+  /* Note that Debian/kFreeBSD (FreeBSD kernel with glibc) has conflicting
+   * out[bwl] definitions in machine/cpufunc.h and sys/io.h at least in some
+   * versions. Use machine/cpufunc.h only for plain FreeBSD/DragonFlyBSD.
+   */
+  #include <sys/types.h>
+  #include <machine/cpufunc.h>
+  #define OUTB(x, y) do { u_int outb_tmp = (y); outb(outb_tmp, (x)); } while (0)
+  #define OUTW(x, y) do { u_int outw_tmp = (y); outw(outw_tmp, (x)); } while (0)
+  #define OUTL(x, y) do { u_int outl_tmp = (y); outl(outl_tmp, (x)); } while (0)
+  #define INB(x) __extension__ ({ u_int inb_tmp = (x); inb(inb_tmp); })
+  #define INW(x) __extension__ ({ u_int inw_tmp = (x); inw(inw_tmp); })
+  #define INL(x) __extension__ ({ u_int inl_tmp = (x); inl(inl_tmp); })
+#else
+
+#if defined (__sun)
+  /* Note different order for outb */
+  #define OUTB(x,y) outb(y, x)
+  #define OUTW(x,y) outw(y, x)
+  #define OUTL(x,y) outl(y, x)
+  #define INB  inb
+  #define INW  inw
+  #define INL  inl
+#else
+
+#ifdef __DJGPP__
+
+#include <pc.h>
+
+  #define OUTB(x,y) outportb(y, x)
+  #define OUTW(x,y) outportw(y, x)
+  #define OUTL(x,y) outportl(y, x)
+
+  #define INB  inportb
+  #define INW  inportw
+  #define INL  inportl
+
+#else
+
+#if defined(__MACH__) && defined(__APPLE__)
+    /* Header is part of the DirectHW library. */
+    #include <DirectHW/DirectHW.h>
+#endif
+
+  /* This is the usual glibc interface. */
+  #define OUTB outb
+  #define OUTW outw
+  #define OUTL outl
+  #define INB  inb
+  #define INW  inw
+  #define INL  inl
+#endif
+#endif
+#endif
+
+#if defined(__NetBSD__) || defined (__OpenBSD__)
+  #if defined(__i386__) || defined(__x86_64__)
+    #include <sys/types.h>
+    #include <machine/sysarch.h>
+    #if defined(__NetBSD__)
+      #if defined(__i386__)
+        #define iopl i386_iopl
+      #elif defined(__x86_64__)
+        #define iopl x86_64_iopl
+      #endif
+    #elif defined (__OpenBSD__)
+      #if defined(__i386__)
+        #define iopl i386_iopl
+      #elif defined(__amd64__)
+        #define iopl amd64_iopl
+      #endif
+    #endif
+
+static inline void outb(uint8_t value, uint16_t port)
+{
+	__asm__ volatile ("outb %b0,%w1": :"a" (value), "Nd" (port));
+}
+
+static inline uint8_t inb(uint16_t port)
+{
+	uint8_t value;
+	__asm__ volatile ("inb %w1,%0":"=a" (value):"Nd" (port));
+	return value;
+}
+
+static inline void outw(uint16_t value, uint16_t port)
+{
+	__asm__ volatile ("outw %w0,%w1": :"a" (value), "Nd" (port));
+}
+
+static inline uint16_t inw(uint16_t port)
+{
+	uint16_t value;
+	__asm__ volatile ("inw %w1,%0":"=a" (value):"Nd" (port));
+	return value;
+}
+
+static inline void outl(uint32_t value, uint16_t port)
+{
+	__asm__ volatile ("outl %0,%w1": :"a" (value), "Nd" (port));
+}
+
+static inline uint32_t inl(uint16_t port)
+{
+	uint32_t value;
+	__asm__ volatile ("inl %1,%0":"=a" (value):"Nd" (port));
+	return value;
+}
+  #endif
+#endif
+
+#endif /* __HWACCESS_X86_IO_H__ */