* Implemented mprotect(). A vm_area does now have an optional array

specifying the protection of each page (4 bits per page).
* Added no-op implementation of posix_madvise().
* Replaced a few "addr_t size" parameters by "size_t size".


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26871 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/sys/mman.h

@@ -9,7 +9,8 @@
 #include <sys/types.h>
 
 
-/* memory protection for mmap() and others */
+/* memory protection for mmap() and others; assignment compatible with
+   B_{READ,WRITE,EXECUTE}_AREA */
 #define PROT_READ		0x01
 #define PROT_WRITE		0x02
 #define PROT_EXEC		0x04
@@ -30,6 +31,13 @@
 #define MS_SYNC			0x02
 #define MS_INVALIDATE	0x04
 
+/* posix_madvise() values */
+#define POSIX_MADV_NORMAL		1
+#define POSIX_MADV_SEQUENTIAL	2
+#define POSIX_MADV_RANDOM		3
+#define POSIX_MADV_WILLNEED		4
+#define POSIX_MADV_DONTNEED		5
+
 
 __BEGIN_DECLS
 
@@ -37,8 +45,11 @@ void*	mmap(void* address, size_t length, int protection, int flags,
 			int fd, off_t offset);
 int		munmap(void* address, size_t length);
 
+int		mprotect(void* address, size_t length, int protection);
 int		msync(void* address, size_t length, int flags);
 
+int		posix_madvise(void* address, size_t length, int advice);
+
 int		shm_open(const char* name, int openMode, mode_t permissions);
 int		shm_unlink(const char* name);
 

headers/private/kernel/vm.h

@@ -93,10 +93,15 @@ off_t vm_available_not_needed_memory(void);
 area_id _user_create_area(const char *name, void **address, uint32 addressSpec,
 			size_t size, uint32 lock, uint32 protection);
 status_t _user_delete_area(area_id area);
+
 area_id _user_map_file(const char *uname, void **uaddress, int addressSpec,
-			addr_t size, int protection, int mapping, int fd, off_t offset);
-status_t _user_unmap_memory(void *address, addr_t size);
-status_t _user_sync_memory(void *address, addr_t size, int flags);
+			size_t size, int protection, int mapping, int fd, off_t offset);
+status_t _user_unmap_memory(void *address, size_t size);
+status_t _user_set_memory_protection(void* address, size_t size,
+			int protection);
+status_t _user_sync_memory(void *address, size_t size, int flags);
+status_t _user_memory_advice(void* address, size_t size, int advice);
+
 area_id _user_area_for(void *address);
 area_id _user_find_area(const char *name);
 status_t _user_get_area_info(area_id area, area_info *info);

headers/private/kernel/vm_types.h

@@ -301,6 +301,7 @@ struct vm_area {
 	off_t				cache_offset;
 	uint32				cache_type;
 	vm_area_mappings	mappings;
+	uint8				*page_protections;
 
 	struct vm_address_space *address_space;
 	struct vm_area		*address_space_next;

headers/private/system/syscalls.h

@@ -327,10 +327,14 @@ extern status_t		_kern_reserve_heap_address_range(addr_t* _address, uint32 addre
 						addr_t size);
 
 extern area_id		_kern_map_file(const char *name, void **address,
-						int addressSpec, addr_t size, int protection,
+						int addressSpec, size_t size, int protection,
 						int mapping, int fd, off_t offset);
-extern status_t		_kern_unmap_memory(void *address, addr_t size);
-extern status_t		_kern_sync_memory(void *address, addr_t size, int flags);
+extern status_t		_kern_unmap_memory(void *address, size_t size);
+extern status_t		_kern_set_memory_protection(void *address, size_t size,
+						int protection);
+extern status_t		_kern_sync_memory(void *address, size_t size, int flags);
+extern status_t		_kern_memory_advice(void *address, size_t size,
+						int advice);
 
 /* kernel port functions */
 extern port_id		_kern_create_port(int32 queue_length, const char *name);