[dpdk-dev] [PATCH 1/2] eal: mman implementation for windows

[Pallavi Kadam]

Adding sys/mman.h and mman.c on Windows for supporting
common code.
This implementation has MIT licensing.
https://github.com/witwall/mman-win32

Signed-off-by: Pallavi Kadam <pallavi.kadam at intel.com>
Reviewed-by: Ranjit Menon <ranjit.menon at intel.com>
---
 lib/librte_eal/windows/eal/include/sys/mman.h |  84 ++++++++
 lib/librte_eal/windows/eal/meson.build        |   1 +
 lib/librte_eal/windows/eal/mman.c             | 181 ++++++++++++++++++
 3 files changed, 266 insertions(+)
 create mode 100644 lib/librte_eal/windows/eal/include/sys/mman.h
 create mode 100644 lib/librte_eal/windows/eal/mman.c

diff --git a/lib/librte_eal/windows/eal/include/sys/mman.h b/lib/librte_eal/windows/eal/include/sys/mman.h
new file mode 100644
index 000000000..281302717
--- /dev/null
+++ b/lib/librte_eal/windows/eal/include/sys/mman.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: MIT
+ */
+/*
+ * sys/mman.h
+ * mman-win32
+ */
+
+#ifndef _SYS_MMAN_H_
+#define _SYS_MMAN_H_
+
+/* Allow use of features specific to Windows XP or later.
+ */
+#ifndef _WIN32_WINNT
+/* Change this to the appropriate value to target other versions of Windows.
+ */
+#define _WIN32_WINNT 0x0501
+#endif
+
+/* All the headers include this file. */
+#ifndef _MSC_VER
+#include <_mingw.h>
+#endif
+
+#if defined(MMAN_LIBRARY_DLL)
+/* Windows shared libraries (DLL) must be declared export when building the lib
+ * and import when building the application which links against the library.
+ */
+#if defined(MMAN_LIBRARY)
+#define MMANSHARED_EXPORT __declspec(dllexport)
+#else
+#define MMANSHARED_EXPORT __declspec(dllimport)
+#endif /* MMAN_LIBRARY */
+#else
+/* Static libraries do not require a __declspec attribute.*/
+#define MMANSHARED_EXPORT
+#endif /* MMAN_LIBRARY_DLL */
+
+/* Determine offset type */
+#include <stdint.h>
+#if defined(_WIN64)
+typedef int64_t OffsetType;
+#else
+typedef uint32_t OffsetType;
+#endif
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define PROT_NONE       0
+#define PROT_READ       1
+#define PROT_WRITE      2
+#define PROT_EXEC       4
+
+#define MAP_FILE        0
+#define MAP_SHARED      1
+#define MAP_PRIVATE     2
+#define MAP_TYPE        0xf
+#define MAP_FIXED       0x10
+#define MAP_ANONYMOUS   0x20
+#define MAP_ANON        MAP_ANONYMOUS
+
+#define MAP_FAILED      ((void *)-1)
+
+/* Flags for msync. */
+#define MS_ASYNC        1
+#define MS_SYNC         2
+#define MS_INVALIDATE   4
+
+MMANSHARED_EXPORT void   *mmap(void *addr, size_t len, int prot, int flags,
+				int fildes, OffsetType off);
+MMANSHARED_EXPORT int     munmap(void *addr, size_t len);
+MMANSHARED_EXPORT int     _mprotect(void *addr, size_t len, int prot);
+MMANSHARED_EXPORT int     msync(void *addr, size_t len, int flags);
+MMANSHARED_EXPORT int     mlock(const void *addr, size_t len);
+MMANSHARED_EXPORT int     munlock(const void *addr, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*  _SYS_MMAN_H_ */
diff --git a/lib/librte_eal/windows/eal/meson.build b/lib/librte_eal/windows/eal/meson.build
index 2a062c365..634b689c8 100644
--- a/lib/librte_eal/windows/eal/meson.build
+++ b/lib/librte_eal/windows/eal/meson.build
@@ -24,4 +24,5 @@ env_sources = files('eal.c',
 	'eal_lcore.c',
 	'eal_thread.c',
 	'getopt.c',
+	'mman.c',
 )
diff --git a/lib/librte_eal/windows/eal/mman.c b/lib/librte_eal/windows/eal/mman.c
new file mode 100644
index 000000000..c1f60d4df
--- /dev/null
+++ b/lib/librte_eal/windows/eal/mman.c
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: MIT
+ */
+
+#include <windows.h>
+#include <errno.h>
+#include <io.h>
+
+#include "sys/mman.h"
+
+#ifndef FILE_MAP_EXECUTE
+#define FILE_MAP_EXECUTE    0x0020
+#endif /* FILE_MAP_EXECUTE */
+
+static int __map_mman_error(const DWORD err, const int deferr)
+{
+	if (err == 0)
+		return 0;
+	//TODO: implement
+	return err;
+}
+
+static DWORD __map_mmap_prot_page(const int prot)
+{
+	DWORD protect = 0;
+
+	if (prot == PROT_NONE)
+		return protect;
+
+	if ((prot & PROT_EXEC) != 0) {
+		protect = ((prot & PROT_WRITE) != 0) ?
+		PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
+	} else {
+		protect = ((prot & PROT_WRITE) != 0) ?
+		PAGE_READWRITE : PAGE_READONLY;
+	}
+
+	return protect;
+}
+
+static DWORD __map_mmap_prot_file(const int prot)
+{
+	DWORD desiredAccess = 0;
+
+	if (prot == PROT_NONE)
+		return desiredAccess;
+
+	if ((prot & PROT_READ) != 0)
+		desiredAccess |= FILE_MAP_READ;
+	if ((prot & PROT_WRITE) != 0)
+		desiredAccess |= FILE_MAP_WRITE;
+	if ((prot & PROT_EXEC) != 0)
+		desiredAccess |= FILE_MAP_EXECUTE;
+
+	return desiredAccess;
+}
+
+void*
+mmap(void *addr, size_t len, int prot, int flags, int fildes, OffsetType off)
+{
+	HANDLE fm, h;
+
+	void *map = MAP_FAILED;
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4293)
+#endif
+
+	const DWORD dwFileOffsetLow = (sizeof(OffsetType) <= sizeof(DWORD)) ?
+		(DWORD)off : (DWORD)(off & 0xFFFFFFFFL);
+	const DWORD dwFileOffsetHigh = (sizeof(OffsetType) <= sizeof(DWORD)) ?
+		(DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL);
+	const DWORD protect = __map_mmap_prot_page(prot);
+	const DWORD desiredAccess = __map_mmap_prot_file(prot);
+
+	const OffsetType maxSize = off + (OffsetType)len;
+
+	const DWORD dwMaxSizeLow = (sizeof(OffsetType) <= sizeof(DWORD)) ?
+		(DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL);
+	const DWORD dwMaxSizeHigh = (sizeof(OffsetType) <= sizeof(DWORD)) ?
+		(DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL);
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+	errno = 0;
+
+	if (len == 0
+		/* Usupported protection combinations */
+		|| prot == PROT_EXEC){
+		errno = EINVAL;
+		return MAP_FAILED;
+	}
+
+	h = ((flags & MAP_ANONYMOUS) == 0) ?
+		(HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE;
+
+	if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE) {
+		errno = EBADF;
+		return MAP_FAILED;
+	}
+
+	fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow,
+		NULL);
+
+	if (fm == NULL) {
+		errno = __map_mman_error(GetLastError(), EPERM);
+		return MAP_FAILED;
+	}
+
+	if ((flags & MAP_FIXED) == 0) {
+		map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh,
+			dwFileOffsetLow, len);
+	} else {
+		map = MapViewOfFileEx(fm, desiredAccess, dwFileOffsetHigh,
+			dwFileOffsetLow, len, addr);
+	}
+
+	CloseHandle(fm);
+
+	if (map == NULL) {
+		errno = __map_mman_error(GetLastError(), EPERM);
+		return MAP_FAILED;
+	}
+
+	return map;
+}
+
+int munmap(void *addr, size_t len)
+{
+	if (UnmapViewOfFile(addr))
+		return 0;
+
+	errno = __map_mman_error(GetLastError(), EPERM);
+
+	return -1;
+}
+
+int _mprotect(void *addr, size_t len, int prot)
+{
+	DWORD newProtect = __map_mmap_prot_page(prot);
+	DWORD oldProtect = 0;
+
+	if (VirtualProtect(addr, len, newProtect, &oldProtect))
+		return 0;
+
+	errno = __map_mman_error(GetLastError(), EPERM);
+
+	return -1;
+}
+
+int msync(void *addr, size_t len, int flags)
+{
+	if (FlushViewOfFile(addr, len))
+		return 0;
+
+	errno = __map_mman_error(GetLastError(), EPERM);
+
+	return -1;
+}
+
+int mlock(const void *addr, size_t len)
+{
+	if (VirtualLock((LPVOID)addr, len))
+		return 0;
+
+	errno = __map_mman_error(GetLastError(), EPERM);
+
+	return -1;
+}
+
+int munlock(const void *addr, size_t len)
+{
+	if (VirtualUnlock((LPVOID)addr, len))
+		return 0;
+
+	errno = __map_mman_error(GetLastError(), EPERM);
+
+	return -1;
+}
-- 
2.18.0.windows.1