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[fs/lustre-release.git] / libcfs / include / libcfs / winnt / winnt-mem.h

diff --git a/libcfs/include/libcfs/winnt/winnt-mem.h b/libcfs/include/libcfs/winnt/winnt-mem.h
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=4:tabstop=4:
+ *
+ *  Copyright (C) 2001 Cluster File Systems, Inc. <braam@clusterfs.com>
+ *
+ *   This file is part of Lustre, http://www.lustre.org.
+ *
+ *   Lustre is free software; you can redistribute it and/or
+ *   modify it under the terms of version 2 of the GNU General Public
+ *   License as published by the Free Software Foundation.
+ *
+ *   Lustre 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.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Lustre; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Basic library routines of memory manipulation routines .
+ *
+ */
+
+#ifndef __LIBCFS_WINNT_CFS_MEM_H__
+#define __LIBCFS_WINNT_CFS_MEM_H__
+
+#ifndef __LIBCFS_LIBCFS_H__
+#error Do not #include this file directly. #include <libcfs/libcfs.h> instead
+#endif
+
+#ifdef __KERNEL__
+
+#define CFS_PAGE_SIZE                   PAGE_SIZE
+#define CFS_PAGE_SHIFT                  PAGE_SHIFT
+#define CFS_PAGE_MASK                   (~(PAGE_SIZE - 1))
+
+typedef struct cfs_page {
+    void *      addr;
+    atomic_t    count;
+} cfs_page_t;
+
+
+cfs_page_t *cfs_alloc_page(int flags);
+void cfs_free_page(cfs_page_t *pg);
+
+static inline void *cfs_page_address(cfs_page_t *page)
+{
+    return page->addr;
+}
+
+static inline void *cfs_kmap(cfs_page_t *page)
+{
+    return page->addr;
+}
+
+static inline void cfs_kunmap(cfs_page_t *page)
+{
+    return;
+}
+
+static inline void cfs_get_page(cfs_page_t *page)
+{
+    atomic_inc(&page->count);
+}
+
+static inline void cfs_put_page(cfs_page_t *page)
+{
+    atomic_dec(&page->count);
+}
+
+static inline int cfs_page_count(cfs_page_t *page)
+{
+    return atomic_read(&page->count);
+}
+
+/*
+ * Memory allocator
+ */
+
+#define CFS_ALLOC_ATOMIC_TRY   (0)
+
+extern void *cfs_alloc(size_t nr_bytes, u_int32_t flags);
+extern void  cfs_free(void *addr);
+
+extern void *cfs_alloc_large(size_t nr_bytes);
+extern void  cfs_free_large(void *addr);
+
+/*
+ * SLAB allocator
+ */
+
+#define SLAB_HWCACHE_ALIGN             0
+
+/* The cache name is limited to 20 chars */
+
+typedef struct cfs_mem_cache {
+
+    char                    name[20];
+    ulong_ptr           flags;
+    NPAGED_LOOKASIDE_LIST   npll;
+
+} cfs_mem_cache_t;
+
+
+extern cfs_mem_cache_t * cfs_mem_cache_create (const char *, size_t, size_t, ulong_ptr);
+extern int cfs_mem_cache_destroy ( cfs_mem_cache_t * );
+extern void *cfs_mem_cache_alloc ( cfs_mem_cache_t *, int);
+extern void cfs_mem_cache_free ( cfs_mem_cache_t *, void *);
+
+
+/*
+ * Page allocator slabs 
+ */
+
+extern cfs_mem_cache_t *cfs_page_t_slab;
+extern cfs_mem_cache_t *cfs_page_p_slab;
+
+
+#define CFS_DECL_MMSPACE
+#define CFS_MMSPACE_OPEN    do {} while(0)
+#define CFS_MMSPACE_CLOSE   do {} while(0)
+
+
+#define mb()    do {} while(0)
+#define rmb()   mb()
+#define wmb()   mb()
+
+
+/* __KERNEL__ */
+#endif
+
+#endif /* __WINNT_CFS_MEM_H__ */