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+/*
+ *------------------------------------------------------------------
+ * svm.h - shared VM allocation, mmap(...MAP_FIXED...)
+ * brain police
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#ifndef __included_svm_h__
+#define __included_svm_h__
+
+#include <pthread.h>
+#include <vppinfra/clib.h>
+#include <vppinfra/mem.h>
+
+#define MMAP_PAGESIZE (4<<10)
+
+#define SVM_VERSION ((1<<16) | 1) /* set to declare region ready. */
+
+#define SVM_FLAGS_MHEAP (1<<0) /* region contains an mheap */
+#define SVM_FLAGS_FILE (1<<1) /* region backed by one or more files */
+#define SVM_FLAGS_NODATA (1<<2) /* region will be further subdivided */
+#define SVM_FLAGS_NEED_DATA_INIT (1<<3)
+
+#define SVM_PVT_MHEAP_SIZE (32<<10) /* region's private mheap (32k) */
+
+typedef struct svm_region_ {
+ volatile uword version;
+ pthread_mutex_t mutex;
+ pthread_cond_t condvar;
+ int mutex_owner_pid; /* in case of trouble */
+ int mutex_owner_tag;
+ uword flags;
+ uword virtual_base; /* base of the region object */
+ uword virtual_size;
+ void *region_heap;
+ void *data_base; /* data portion base address */
+ void *data_heap; /* data heap, if any */
+ volatile void *user_ctx; /* user context pointer */
+ /* stuff allocated in the region's heap */
+ uword bitmap_size; /* nbits in virtual alloc bitmap */
+ uword *bitmap; /* the bitmap */
+ char *region_name;
+ char *backing_file;
+ char **filenames;
+ uword *client_pids;
+ /* pad */
+
+ /* next page:
+ * (64K) clib heap for the region itself
+ *
+ * data_base -> whatever is in this region
+ */
+
+} svm_region_t;
+
+typedef struct svm_map_region_args_ {
+ char *root_path; /* NULL means use the truly global arena */
+ char *name;
+ uword baseva;
+ uword size;
+ uword flags;
+ char *backing_file;
+ uword backing_mmap_size;
+} svm_map_region_args_t;
+
+
+/*
+ * Memory shared across all router instances. Packet buffers, etc
+ * Base should be "out of the way," and size should be big enough to
+ * cover everything we plan to put here.
+ */
+#define SVM_GLOBAL_REGION_BASEVA 0x30000000
+#define SVM_GLOBAL_REGION_SIZE (64<<20)
+#define SVM_GLOBAL_REGION_NAME "/global_vm"
+
+/*
+ * Memory shared across individual router instances.
+ */
+#define SVM_OVERLAY_REGION_BASEVA \
+ (SVM_GLOBAL_REGION_BASEVA + SVM_GLOBAL_REGION_SIZE)
+#define SVM_OVERLAY_REGION_SIZE (1<<20)
+#define SVM_OVERLAY_REGION_BASENAME "/overlay_vm"
+
+typedef struct {
+ u8 *subregion_name;
+} svm_subregion_t;
+
+typedef struct {
+ svm_subregion_t *subregions; /* subregion pool */
+ uword *name_hash;
+ u8 *root_path;
+} svm_main_region_t;
+
+
+void *svm_region_find_or_create (svm_map_region_args_t *a);
+void svm_region_init(void);
+void svm_region_init_chroot(char *root_path);
+void svm_region_exit (void);
+void svm_region_unmap(void *rp_arg);
+void svm_client_scan (char *root_path);
+void svm_client_scan_this_region_nolock (svm_region_t *rp);
+u8 *shm_name_from_svm_map_region_args (svm_map_region_args_t *a);
+
+static inline void *svm_mem_alloc (svm_region_t *rp, uword size)
+{
+ u8 *oldheap;
+ ASSERT(rp->flags & SVM_FLAGS_MHEAP);
+ u8 *rv;
+
+ pthread_mutex_lock(&rp->mutex);
+ oldheap = clib_mem_set_heap(rp->data_heap);
+ rv = clib_mem_alloc (size);
+ clib_mem_set_heap(oldheap);
+ pthread_mutex_unlock(&rp->mutex);
+ return (rv);
+}
+
+static inline void *svm_mem_alloc_aligned_at_offset (svm_region_t *rp,
+ uword size,
+ uword align,
+ uword offset)
+{
+ u8 *oldheap;
+ ASSERT(rp->flags & SVM_FLAGS_MHEAP);
+ u8 *rv;
+
+ pthread_mutex_lock(&rp->mutex);
+ oldheap = clib_mem_set_heap(rp->data_heap);
+ rv = clib_mem_alloc_aligned_at_offset (size, align, offset);
+ clib_mem_set_heap(oldheap);
+ pthread_mutex_unlock(&rp->mutex);
+ return (rv);
+}
+
+static inline void svm_mem_free (svm_region_t *rp, void *ptr)
+{
+ u8 *oldheap;
+ ASSERT(rp->flags & SVM_FLAGS_MHEAP);
+
+ pthread_mutex_lock(&rp->mutex);
+ oldheap = clib_mem_set_heap(rp->data_heap);
+ clib_mem_free (ptr);
+ clib_mem_set_heap(oldheap);
+ pthread_mutex_unlock(&rp->mutex);
+
+}
+
+static inline void *svm_push_pvt_heap (svm_region_t *rp)
+{
+ u8 *oldheap;
+ oldheap = clib_mem_set_heap(rp->region_heap);
+ return ((void *) oldheap);
+}
+
+static inline void *svm_push_data_heap (svm_region_t *rp)
+{
+ u8 *oldheap;
+ oldheap = clib_mem_set_heap(rp->data_heap);
+ return ((void *) oldheap);
+}
+
+static inline void svm_pop_heap (void *oldheap)
+{
+ clib_mem_set_heap(oldheap);
+}
+
+u8 * format_svm_region (u8 * s, va_list * args);
+
+svm_region_t *svm_get_root_rp (void);
+
+#endif /* __included_svm_h__ */