3 * \brief Common constants.
7 * (c) 2008-2009 Technische Universität Dresden
8 * This file is part of TUD:OS and distributed under the terms of the
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10 * Please see the COPYING-GPL-2 file for details.
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13 * library without restriction. Specifically, if other files instantiate
14 * templates or use macros or inline functions from this file, or you compile
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19 * the GNU General Public License.
21 #ifndef __L4_SYS__INCLUDE__CONSTS_H__
22 #define __L4_SYS__INCLUDE__CONSTS_H__
24 #include <l4/sys/compiler.h>
25 #include <l4/sys/l4int.h>
28 * \addtogroup l4_cap_api
30 * <c>\#include <l4/sys/consts.h></c>
34 * \brief Capability selector flags.
37 * These flags determine the concrete operation when a kernel object
40 enum l4_syscall_flags_t
43 * \brief Default flags (call to a kernel object).
46 * Using this value as flags in the capability selector for an
47 * invocation indicates a call (send and wait for a reply).
52 * \brief Send-phase flag.
55 * Setting this flag in a capability selector induces a send phase,
56 * this means a message is send to the object denoted by the capability.
57 * For receive phase see #L4_SYSF_RECV.
62 * \brief Receive-phase flag.
65 * Setting this flag in a capability selector induces a receive phase,
66 * this means the invoking thread waits for a message from the object
67 * denoted by the capability.
68 * For a send phase see #L4_SYSF_SEND.
73 * \brief Open-wait flag.
76 * This flag indicates that the receive operation (see #L4_SYSF_RECV)
77 * shall be an \em open \em wait. \em Open \em wait means that the invoking
78 * thread shall wait for a message from any possible sender and \em not from
79 * the sender denoted by the capability.
81 L4_SYSF_OPEN_WAIT = 0x04,
87 * This flag indicates that the send phase shall use the in-kernel reply
88 * capability instead of the capability denoted by the selector index.
93 * \brief Call flags (combines send and receive).
96 * Combines #L4_SYSF_SEND and L4_SYSF_RECV.
98 L4_SYSF_CALL = L4_SYSF_SEND | L4_SYSF_RECV,
101 * \brief Wait flags (combines receive and open wait).
104 * Combines #L4_SYSF_RECV and #L4_SYSF_OPEN_WAIT.
106 L4_SYSF_WAIT = L4_SYSF_OPEN_WAIT | L4_SYSF_RECV,
109 * \brief Send-and-wait flags.
112 * Combines #L4_SYSF_SEND and #L4_SYSF_WAIT.
114 L4_SYSF_SEND_AND_WAIT = L4_SYSF_OPEN_WAIT | L4_SYSF_CALL,
117 * \brief Reply-and-wait flags.
120 * Combines #L4_SYSF_SEND, #L4_SYSF_REPLY, and #L4_SYSF_WAIT.
122 L4_SYSF_REPLY_AND_WAIT = L4_SYSF_WAIT | L4_SYSF_SEND | L4_SYSF_REPLY
126 * \brief Constants related to capability selectors.
127 * \ingroup l4_cap_api
131 /** \brief Capability index shift. \hideinitializer */
133 /** \brief Offset of two consecutive capability selectors. \hideinitializer */
134 L4_CAP_SIZE = 1UL << L4_CAP_SHIFT,
135 L4_CAP_OFFSET = 1UL << L4_CAP_SHIFT,
137 * \brief Mask to get only the relevant bits of an l4_cap_idx_t.
140 L4_CAP_MASK = ~0UL << (L4_CAP_SHIFT -1),
141 /** \brief Invalid capability selector. \hideinitializer */
142 L4_INVALID_CAP = ~0UL << (L4_CAP_SHIFT -1),
144 L4_INVALID_CAP_BIT = 1UL << (L4_CAP_SHIFT -1),
147 enum l4_sched_consts_t
149 L4_SCHED_MIN_PRIO = 0,
150 L4_SCHED_MAX_PRIO = 255,
154 * \brief Flags for the unmap operation.
155 * \ingroup l4_task_api
156 * \see L4::Task::unmap() and l4_task_unmap()
158 enum l4_unmap_flags_t
161 * \brief Flag to tell the unmap operation to unmap all child mappings
162 * including the mapping in the invoked task.
164 * \see L4::Task::unmap() l4_task_unmap()
166 L4_FP_ALL_SPACES = 0x80000000UL,
169 * \brief Flag that indicates that the unmap operation on a capability
170 * shall try to delete the corresponding objects immediately.
172 * \see L4::Task::unmap() l4_task_unmap()
174 L4_FP_DELETE_OBJ = 0xc0000000UL,
177 * \brief Counterpart to #L4_FP_ALL_SPACES, unmap only child mappings.
179 * \see L4::Task::unmap() l4_task_unmap()
181 L4_FP_OTHER_SPACES = 0x0UL
185 * \brief Constants for message items.
186 * \ingroup l4_msgitem_api
188 enum l4_msg_item_consts_t
190 L4_ITEM_MAP = 8, ///< Identify a message item as \em map \em item.
193 * \brief Donote that the following item shall be put into the same receive
199 L4_MAP_ITEM_GRANT = 2, ///< Flag as \em grant instead of \em map operation.
200 L4_MAP_ITEM_MAP = 0, ///< Flag as usual \em map operation.
204 * \brief Mark the receive buffer to be a small receive item that describes
205 * a buffer for a single capability.
207 L4_RCV_ITEM_SINGLE_CAP = L4_ITEM_MAP | 2,
210 * \brief The receiver requests to receive a local ID instead of a mapping
213 L4_RCV_ITEM_LOCAL_ID = 4,
217 * \brief Constants for buffer descriptors.
218 * \ingroup l4_utcb_br_api
220 enum l4_buffer_desc_consts_t
222 L4_BDR_MEM_SHIFT = 0, ///< Bit offset for the memory-buffer index
223 L4_BDR_IO_SHIFT = 5, ///< Bit offset for the IO-buffer index
224 L4_BDR_OBJ_SHIFT = 10, ///< Bit offset for the capability-buffer index
225 L4_BDR_OFFSET_MASK = (1UL << 20) - 1,
229 * \brief Default capabilities setup for the initial tasks.
230 * \ingroup l4_cap_api
232 * <c>\#include <l4/sys/consts.h></c>
234 * These capability selectors are setup per default by the micro kernel
235 * for the two initial tasks, the Root-Pager (Sigma0) and the Root-Task
238 * \attention This constants do not have any particular meaning for
239 * applications started by Moe, see \ref api_l4re_env for
240 * this kind of information.
241 * \see \ref api_l4re_env for information useful for normal user applications.
243 enum l4_default_caps_t
245 /// Capability selector for the current task. \hideinitializer
246 L4_BASE_TASK_CAP = 1UL << L4_CAP_SHIFT,
247 /// Capability selector for the factory. \hideinitializer
248 L4_BASE_FACTORY_CAP = 2UL << L4_CAP_SHIFT,
249 /// Capability selector for the first thread. \hideinitializer
250 L4_BASE_THREAD_CAP = 3UL << L4_CAP_SHIFT,
251 /// Capability selector for the pager gate. \hideinitializer
252 L4_BASE_PAGER_CAP = 4UL << L4_CAP_SHIFT,
253 /// Capability selector for the log object. \hideinitializer
254 L4_BASE_LOG_CAP = 5UL << L4_CAP_SHIFT,
255 /// Capability selector for the base icu object. \hideinitializer
256 L4_BASE_ICU_CAP = 6UL << L4_CAP_SHIFT,
257 /// Capability selector for the scheduler cap. \hideinitializer
258 L4_BASE_SCHEDULER_CAP = 7UL << L4_CAP_SHIFT,
262 * \defgroup l4_memory_api Memory related
263 * \brief Memory related constants, data types and functions.
267 * \brief Minimal page size (in bytes).
268 * \ingroup l4_memory_api
271 #define L4_PAGESIZE (1UL << L4_PAGESHIFT)
274 * \brief Mask for the page number.
275 * \ingroup l4_memory_api
278 * \note The most significant bits are set.
280 #define L4_PAGEMASK (~(L4_PAGESIZE - 1))
283 * \brief Number of bits used for page offset.
284 * \ingroup l4_memory_api
287 * Size of page in log2.
289 #define L4_LOG2_PAGESIZE L4_PAGESHIFT
292 * \brief Size of a large page.
293 * \ingroup l4_memory_api
296 * A large page is a \em super \em page on IA32 or a \em section on ARM.
298 #define L4_SUPERPAGESIZE (1UL << L4_SUPERPAGESHIFT)
301 * \brief Mask for the number of a large page.
302 * \ingroup l4_memory_api
305 * \note The most significant bits are set.
307 #define L4_SUPERPAGEMASK (~(L4_SUPERPAGESIZE - 1))
310 * \brief Number of bits used as offset for a large page.
311 * \ingroup l4_memory_api
313 * Size of large page in log2
315 #define L4_LOG2_SUPERPAGESIZE L4_SUPERPAGESHIFT
318 * \brief Round an address down to the next lower page boundary.
319 * \ingroup l4_memory_api
321 * \param address The address to round.
323 L4_INLINE l4_addr_t l4_trunc_page(l4_addr_t address) L4_NOTHROW;
324 L4_INLINE l4_addr_t l4_trunc_page(l4_addr_t x) L4_NOTHROW
325 { return x & L4_PAGEMASK; }
328 * \brief Round an address down to the next lower flex page with size \a bits.
329 * \ingroup l4_memory_api
331 * \param address The address to round.
332 * \param bits The size of the flex page (log2).
334 L4_INLINE l4_addr_t l4_trunc_size(l4_addr_t address, unsigned char bits) L4_NOTHROW;
335 L4_INLINE l4_addr_t l4_trunc_size(l4_addr_t x, unsigned char bits) L4_NOTHROW
336 { return x & (~0UL << bits); }
339 * \brief Round address up to the next page.
340 * \ingroup l4_memory_api
342 * \param address The address to round up.
344 L4_INLINE l4_addr_t l4_round_page(l4_addr_t address) L4_NOTHROW;
345 L4_INLINE l4_addr_t l4_round_page(l4_addr_t x) L4_NOTHROW
346 { return (x + L4_PAGESIZE-1) & L4_PAGEMASK; }
349 * \brief Round address up to the next flex page with \a bits size.
350 * \ingroup l4_memory_api
352 * \param address The address to round up to the next flex page.
353 * \param bits The size of the flex page (log2).
355 L4_INLINE l4_addr_t l4_round_size(l4_addr_t address, unsigned char bits) L4_NOTHROW;
356 L4_INLINE l4_addr_t l4_round_size(l4_addr_t x, unsigned char bits) L4_NOTHROW
357 { return (x + (1UL << bits) - 1) & (~0UL << bits); }
361 * \brief Address related constants.
362 * \ingroup l4_memory_api
364 enum l4_addr_consts_t {
366 L4_INVALID_ADDR = ~0UL
370 * \brief Invalid address as pointer type.
371 * \ingroup l4_memory_api
373 #define L4_INVALID_PTR ((void*)L4_INVALID_ADDR)
377 # define NULL ((void *)0) /**< \ingroup l4sys_defines
386 #endif /* ! __L4_SYS__INCLUDE__CONSTS_H__ */