l4/pkg/l4sys/include/thread.h

   1 /**
   2  * \file
   3  * \brief Common thread related definitions.
   4  */
   5 /*
   6  * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
   7  *               Alexander Warg <warg@os.inf.tu-dresden.de>,
   8  *               Björn Döbel <doebel@os.inf.tu-dresden.de>,
   9  *               Torsten Frenzel <frenzel@os.inf.tu-dresden.de>
  10  *     economic rights: Technische Universität Dresden (Germany)
  11  *
  12  * This file is part of TUD:OS and distributed under the terms of the
  13  * GNU General Public License 2.
  14  * Please see the COPYING-GPL-2 file for details.
  15  *
  16  * As a special exception, you may use this file as part of a free software
  17  * library without restriction.  Specifically, if other files instantiate
  18  * templates or use macros or inline functions from this file, or you compile
  19  * this file and link it with other files to produce an executable, this
  20  * file does not by itself cause the resulting executable to be covered by
  21  * the GNU General Public License.  This exception does not however
  22  * invalidate any other reasons why the executable file might be covered by
  23  * the GNU General Public License.
  24  */
  25 #pragma once
  26
  27 #include <l4/sys/types.h>
  28 #include <l4/sys/utcb.h>
  29 #include <l4/sys/ipc.h>
  30
  31 /**
  32  * \defgroup l4_thread_api Thread
  33  * \ingroup  l4_kernel_object_api
  34  * \brief Thread object.
  35  *
  36  * <c>\#include <l4/sys/thread.h></c>
  37  *
  38  * The thread class defines a thread of execution in the L4 context.
  39  * Usually user-level and kernel threads are mapped 1:1 to each other.
  40  * Thread kernel object are created using a Factory, see \ref l4_factory_api
  41  * (l4_factory_create_thread()).
  42  *
  43  * An L4 thread encapsulates:
  44  * - CPU state
  45  *   - General-purpose registers
  46  *   - Program counter
  47  *   - Stack pointer
  48  * - FPU state
  49  * - Scheduling parameters
  50  *   - CPU-set
  51  *   - Priority (0-255)
  52  *   - Time slice length
  53  * - Execution state
  54  *   - Blocked, Runnable, Running
  55  *
  56  * Thread objects provide an API for
  57  * - Thread configuration and manipulation
  58  * - Thread switching.
  59  *
  60  * The thread control functions are used to control various aspects of a
  61  * thread. See l4_thread_control_start() for more information.
  62  */
  63
  64
  65 /**
  66  * \brief Exchange basic thread registers.
  67  * \ingroup l4_thread_api
  68  *
  69  * \param thread Thread to manipulate
  70  * \param ip     New instruction pointer, use ~0UL to leave the
  71  *               instruction pointer unchanged
  72  * \param sp     New stack pointer, use ~0UL to leave the stack
  73  *               pointer unchanged
  74  * \param flags  Ex-regs flags, see #L4_thread_ex_regs_flags
  75  *
  76  * \return System call return tag
  77  *
  78  * This method allows to manipulate and start a thread. The basic
  79  * functionality is to set the instruction pointer and the stack pointer of a
  80  * thread. Additionally, this method allows also to cancel ongoing IPC
  81  * operations and to force the thread to raise an artificial exception (see \a
  82  * flags).
  83  *
  84  */
  85 L4_INLINE l4_msgtag_t
  86 l4_thread_ex_regs(l4_cap_idx_t thread, l4_addr_t ip, l4_addr_t sp,
  87                   l4_umword_t flags) L4_NOTHROW;
  88
  89 /**
  90  * \internal
  91  * \ingroup l4_thread_api
  92  */
  93 L4_INLINE l4_msgtag_t
  94 l4_thread_ex_regs_u(l4_cap_idx_t thread, l4_addr_t ip, l4_addr_t sp,
  95                     l4_umword_t flags, l4_utcb_t *utcb) L4_NOTHROW;
  96
  97 /**
  98  * \brief Exchange basic thread registers and return previous values.
  99  * \ingroup l4_thread_api
 100  *
 101  * \param  thread Thread to manipulate
 102  * \retval ip     New instruction pointer, use ~0UL to leave the
 103  *                instruction pointer unchanged, return previous instruction
 104  *                pointer
 105  * \retval sp     New stack pointer, use ~0UL to leave the stack
 106  *                pointer unchanged, returns previous stack pointer
 107  * \retval flags  Ex-regs flags, see #L4_thread_ex_regs_flags, return
 108  *                previous CPU flags of the thread.
 109  *
 110  * \return System call return tag
 111  *
 112  * This method allows to manipulate and start a thread. The basic
 113  * functionality is to set the instruction pointer and the stack pointer of a
 114  * thread. Additionally, this method allows also to cancel ongoing IPC
 115  * operations and to force the thread to raise an artificial exception (see \a
 116  * flags).
 117  *
 118  * Returned values are valid only if function returns successfully.
 119  */
 120 L4_INLINE l4_msgtag_t
 121 l4_thread_ex_regs_ret(l4_cap_idx_t thread, l4_addr_t *ip, l4_addr_t *sp,
 122                       l4_umword_t *flags) L4_NOTHROW;
 123
 124 /**
 125  * \internal
 126  * \ingroup l4_thread_api
 127  */
 128 L4_INLINE l4_msgtag_t
 129 l4_thread_ex_regs_ret_u(l4_cap_idx_t thread, l4_addr_t *ip, l4_addr_t *sp,
 130                         l4_umword_t *flags, l4_utcb_t *utcb) L4_NOTHROW;
 131
 132
 133
 134 /**
 135  * \defgroup l4_thread_control_api Thread control
 136  * \ingroup l4_thread_api
 137  *
 138  * \brief API for Thread Control method.
 139  *
 140  *
 141  * The thread control API provides access to almost any parameter of a thread
 142  * object. The API is based on a single invocation of the thread object.
 143  * However, because of the huge amount of parameters, the API provides a set
 144  * of functions to set specific parameters of a thread and a commit function
 145  * to commit the thread control call (see l4_thread_control_commit()).
 146  *
 147  * A thread control operation must always start with l4_thread_control_start()
 148  * and be committed with l4_thread_control_commit().  All other thread control
 149  * parameter setter functions must be called between these two functions.
 150  *
 151  * An example for a sequence of thread control API calls can be found below.
 152  *
 153  *  l4_utcb_t *u = l4_utcb(); <br>
 154  *  \link l4_thread_control_start() l4_thread_control_start(u)\endlink; <br>
 155  *  \link l4_thread_control_pager() l4_thread_control_pager(u, pager_cap)\endlink; <br>
 156  *  \link l4_thread_control_bind() l4_thread_control_bind (u, thread_utcb, task)\endlink; <br>
 157  *  \link l4_thread_control_commit() l4_thread_control_commit(u, thread_cap)\endlink; <br>
 158  *
 159  */
 160
 161 /**
 162  * \brief Start a thread control API sequence.
 163  * \ingroup l4_thread_control_api
 164  *
 165  * This function starts a sequence of thread control API functions.
 166  * After this functions any of following functions may be called in any order.
 167  * - l4_thread_control_pager()
 168  * - l4_thread_control_exc_handler()
 169  * - l4_thread_control_scheduler()
 170  * - l4_thread_control_bind()
 171  * - l4_thread_control_alien()
 172  * - l4_thread_control_ux_host_syscall() (Fiasco-UX only)
 173  *
 174  * To commit the changes to the thread l4_thread_control_commit() must be
 175  * called in the end.
 176  *
 177  * \note The thread control API calls store the parameters for the thread in
 178  *       the UTCB of the caller, this means between l4_thread_control_start()
 179  *       and l4_thread_control_commit() no functions that modify the UTCB
 180  *       contents must be called.
 181  */
 182 L4_INLINE void
 183 l4_thread_control_start(void) L4_NOTHROW;
 184
 185 /**
 186  * \internal
 187  * \ingroup l4_thread_control_api
 188  */
 189 L4_INLINE void
 190 l4_thread_control_start_u(l4_utcb_t *utcb) L4_NOTHROW;
 191
 192 /**
 193  * \brief Set the pager.
 194  * \ingroup l4_thread_control_api
 195  *
 196  * \param pager     Capability selector invoked to send a page-fault IPC.
 197  *
 198  * \note The pager capability selector is interpreted in the task the thread
 199  *       is bound to (executes in).
 200  */
 201 L4_INLINE void
 202 l4_thread_control_pager(l4_cap_idx_t pager) L4_NOTHROW;
 203
 204 /**
 205  * \internal
 206  * \ingroup l4_thread_control_api
 207  */
 208 L4_INLINE void
 209 l4_thread_control_pager_u(l4_cap_idx_t pager, l4_utcb_t *utcb) L4_NOTHROW;
 210
 211 /**
 212  * \brief Set the exception handler.
 213  * \ingroup l4_thread_control_api
 214  *
 215  * \param exc_handler  Capability selector invoked to send an exception IPC.
 216  *
 217  * \note The exception-handler capability selector is interpreted in the task
 218  *       the thread is bound to (executes in).
 219  */
 220 L4_INLINE void
 221 l4_thread_control_exc_handler(l4_cap_idx_t exc_handler) L4_NOTHROW;
 222
 223 /**
 224  * \internal
 225  * \ingroup l4_thread_control_api
 226  */
 227 L4_INLINE void
 228 l4_thread_control_exc_handler_u(l4_cap_idx_t exc_handler,
 229                                 l4_utcb_t *utcb) L4_NOTHROW;
 230
 231 /**
 232  * \brief Set the scheduler.
 233  * \ingroup l4_thread_control_api
 234  *
 235  * \param scheduler Capability selector invoked to send a scheduling IPC.
 236  *
 237  * \note The scheduler capability selector is interpreted in the task the
 238  *       thread is bound to (executes in).
 239  */
 240 L4_INLINE void
 241 l4_thread_control_scheduler(l4_cap_idx_t scheduler) L4_NOTHROW;
 242
 243 /**
 244  * \internal
 245  * \ingroup l4_thread_control_api
 246  */
 247 L4_INLINE void
 248 l4_thread_control_scheduler_u(l4_cap_idx_t scheduler, l4_utcb_t *utcb) L4_NOTHROW;
 249
 250 /**
 251  * \brief Bind the thread to a task.
 252  * \ingroup l4_thread_control_api
 253  *
 254  * \param thread_utcb The address of the UTCB in the target task.
 255  * \param task        The target task of the thread.
 256  *
 257  * Binding a thread to a task has the effect that the thread
 258  * afterwards executes code within that task and has access to the
 259  * resources visible within that task.
 260  *
 261  * \note There should not be more than one thread use a UTCB to prevent
 262  *       data corruption.
 263  *
 264  */
 265 L4_INLINE void
 266 l4_thread_control_bind(l4_utcb_t *thread_utcb,
 267                        l4_cap_idx_t task) L4_NOTHROW;
 268
 269 /**
 270  * \internal
 271  * \ingroup l4_thread_control_api
 272  */
 273 L4_INLINE void
 274 l4_thread_control_bind_u(l4_utcb_t *thread_utcb,
 275                          l4_cap_idx_t task, l4_utcb_t *utcb) L4_NOTHROW;
 276
 277 /**
 278  * \brief Enable alien mode.
 279  * \ingroup l4_thread_control_api
 280  * \param   on    Boolean value defining the state of the feature.
 281  *
 282  * Alien mode means the thread is not allowed to invoke L4 kernel objects
 283  * directly and it is also not allowed to allocate FPU state. All those
 284  * operations result in an exception IPC that gets sent through the pager
 285  * capability. The responsible pager can then selectively allow an object
 286  * invocation or allocate FPU state for the thread.
 287  *
 288  * This feature can be used to attach a debugger to a thread and trace all
 289  * object invocations.
 290  */
 291 L4_INLINE void
 292 l4_thread_control_alien(int on) L4_NOTHROW;
 293
 294 /**
 295  * \internal
 296  * \ingroup l4_thread_control_api
 297  */
 298 L4_INLINE void
 299 l4_thread_control_alien_u(l4_utcb_t *utcb, int on) L4_NOTHROW;
 300
 301 /**
 302  * \brief Enable pass through of native host (Linux) system calls.
 303  * \ingroup l4_thread_control_api
 304  * \param   on    Boolean value defining the state of the feature.
 305  *
 306  * \pre Running on Fiasco-UX
 307  *
 308  * This enables the thread to do host system calls. This feature is only
 309  * available in Fiasco-UX and ignored in other environments.
 310  */
 311 L4_INLINE void
 312 l4_thread_control_ux_host_syscall(int on) L4_NOTHROW;
 313
 314 /**
 315  * \internal
 316  * \ingroup l4_thread_control_api
 317  */
 318 L4_INLINE void
 319 l4_thread_control_ux_host_syscall_u(l4_utcb_t *utcb, int on) L4_NOTHROW;
 320
 321
 322
 323 /**
 324  * \brief Commit the thread control parameters.
 325  * \ingroup l4_thread_control_api
 326  *
 327  * \param thread  Capability selector of target thread to commit to.
 328  * \return system call return tag
 329  */
 330 L4_INLINE l4_msgtag_t
 331 l4_thread_control_commit(l4_cap_idx_t thread) L4_NOTHROW;
 332
 333 /**
 334  * \internal
 335  * \ingroup l4_thread_control_api
 336  */
 337 L4_INLINE l4_msgtag_t
 338 l4_thread_control_commit_u(l4_cap_idx_t thread, l4_utcb_t *utcb) L4_NOTHROW;
 339
 340 /**
 341  * \brief Yield current time slice.
 342  * \ingroup l4_thread_api
 343  *
 344  * \return system call return tag
 345  */
 346 L4_INLINE l4_msgtag_t
 347 l4_thread_yield(void) L4_NOTHROW;
 348
 349 /**
 350  * \brief Switch to another thread (and donate the remaining time slice).
 351  * \ingroup l4_thread_api
 352  *
 353  * \param to_thread   The thread to switch to.
 354  *
 355  * \return system call return tag
 356  */
 357 L4_INLINE l4_msgtag_t
 358 l4_thread_switch(l4_cap_idx_t to_thread) L4_NOTHROW;
 359
 360 /**
 361  * \internal
 362  * \ingroup l4_thread_api
 363  */
 364 L4_INLINE l4_msgtag_t
 365 l4_thread_switch_u(l4_cap_idx_t to_thread, l4_utcb_t *utcb) L4_NOTHROW;
 366
 367
 368
 369 /**
 370  * \brief Get consumed timed of thread in µs.
 371  * \ingroup l4_thread_api
 372  * \param thread Thread to get the consumed time from.
 373  *
 374  * The consumed time is returned as l4_kernel_clock_t at UTCB message
 375  * register 0.
 376  */
 377 L4_INLINE l4_msgtag_t
 378 l4_thread_stats_time(l4_cap_idx_t thread) L4_NOTHROW;
 379
 380 /**
 381  * \internal
 382  * \ingroup l4_thread_api
 383  */
 384 L4_INLINE l4_msgtag_t
 385 l4_thread_stats_time_u(l4_cap_idx_t thread, l4_utcb_t *utcb) L4_NOTHROW;
 386
 387
 388 /**
 389  * \brief vCPU return from event handler.
 390  * \ingroup l4_thread_api
 391  *
 392  * \return Message tag to be used for l4_sndfpage_add() and
 393  *         l4_thread_vcpu_commit()
 394  *
 395  * The vCPU resume functionality is split in multiple functions to allow the
 396  * specification of additional send-flex-pages using l4_sndfpage_add().
 397  */
 398 L4_INLINE l4_msgtag_t
 399 l4_thread_vcpu_resume_start(void) L4_NOTHROW;
 400
 401 /**
 402  * \internal
 403  * \ingroup l4_thread_api
 404  */
 405 L4_INLINE l4_msgtag_t
 406 l4_thread_vcpu_resume_start_u(l4_utcb_t *utcb) L4_NOTHROW;
 407
 408 /**
 409  * \brief Commit vCPU resume.
 410  * \ingroup l4_thread_api
 411  *
 412  * \param thread    Thread to be resumed, using the invalid cap can be used
 413  *                  for the current thread.
 414  * \param tag       Tag to use, returned by l4_thread_vcpu_resume_start()
 415  *
 416  * \return System call result message tag.
 417  *
 418  * To resume into another address space the capability to the target task
 419  * must be set in the vCPU-state (\see l4_vcpu_state_t). The task needs
 420  * to be set only once, consecutive resumes to the same address space should
 421  * use an invalid capability. The kernel resets the field to
 422  * #L4_INVALID_CAP. To release a task use a different task or use an invalid
 423  * capability with the #L4_SYSF_REPLY flag set.
 424  */
 425 L4_INLINE l4_msgtag_t
 426 l4_thread_vcpu_resume_commit(l4_cap_idx_t thread,
 427                              l4_msgtag_t tag) L4_NOTHROW;
 428
 429 /**
 430  * \internal
 431  * \ingroup l4_thread_api
 432  */
 433 L4_INLINE l4_msgtag_t
 434 l4_thread_vcpu_resume_commit_u(l4_cap_idx_t thread,
 435                                l4_msgtag_t tag, l4_utcb_t *utcb) L4_NOTHROW;
 436
 437
 438 /**
 439  * \brief Enable or disable the vCPU feature for the thread.
 440  * \ingroup l4_thread_api
 441  *
 442  * \param thread The thread for which the vCPU feature shall be enabled or
 443  *               disabled.
 444  * \param vcpu_state The virtual address where the kernel shall store the vCPU
 445  *                   state in case of vCPU exits. The address must be a valid
 446  *                   kernel-user-memory address.
 447  * \return Systemcall result message tag.
 448  *
 449  * This function enables the vCPU feature of the \a thread if \a vcpu_state
 450  * is set to a valid kernel-user-memory address, or disables the vCPU feature
 451  * if \a vcpu_state is 0.
 452  *
 453  */
 454 L4_INLINE l4_msgtag_t
 455 l4_thread_vcpu_control(l4_cap_idx_t thread, l4_addr_t vcpu_state) L4_NOTHROW;
 456
 457 /**
 458  * \internal
 459  * \ingroup l4_thread_api
 460  */
 461 L4_INLINE l4_msgtag_t
 462 l4_thread_vcpu_control_u(l4_cap_idx_t thread, l4_addr_t vcpu_state,
 463                          l4_utcb_t *utcb) L4_NOTHROW;
 464
 465 /**
 466  * \brief Enable or disable the extended vCPU feature for the thread.
 467  * \ingroup l4_thread_api
 468  *
 469  * \param thread The thread for which the extended vCPU feature shall be
 470  *               enabled or disabled.
 471  * \param vcpu_state The virtual address where the kernel shall store the vCPU
 472  *                   state in case of vCPU exits. The address must be a valid
 473  *                   kernel-user-memory address.
 474  * \return Systemcall result message tag.
 475  *
 476  * The extended vCPU feature allows the use of hardware-virtualization
 477  * features such as Intel's VT os AMD's SVM.
 478  *
 479  * This function enables the extended vCPU feature of the \a thread
 480  * if \a vcpu_state is set to a valid kernel-user-memory address, or disables
 481  * the vCPU feature if \a vcpu_state is 0.
 482  *
 483  */
 484 L4_INLINE l4_msgtag_t
 485 l4_thread_vcpu_control_ext(l4_cap_idx_t thread, l4_addr_t ext_vcpu_state) L4_NOTHROW;
 486
 487 /**
 488  * \internal
 489  * \ingroup l4_thread_api
 490  */
 491 L4_INLINE l4_msgtag_t
 492 l4_thread_vcpu_control_ext_u(l4_cap_idx_t thread, l4_addr_t ext_vcpu_state,
 493                              l4_utcb_t *utcb) L4_NOTHROW;
 494
 495
 496 /**
 497  * \brief Register an IRQ that will trigger upon deletion events.
 498  * \ingroup l4_thread_api
 499  *
 500  * \param thread    Thread to register IRQ for.
 501  * \param irq       Irq to register.
 502  *
 503  * \return System call result message tag.
 504  */
 505 L4_INLINE l4_msgtag_t
 506 l4_thread_register_del_irq(l4_cap_idx_t thread, l4_cap_idx_t irq) L4_NOTHROW;
 507
 508 /**
 509  * \internal
 510  * \ingroup l4_thread_api
 511  */
 512 L4_INLINE l4_msgtag_t
 513 l4_thread_register_del_irq_u(l4_cap_idx_t thread, l4_cap_idx_t irq,
 514                              l4_utcb_t *utcb) L4_NOTHROW;
 515
 516 /**
 517  * \brief Start a thread sender modifiction sequence.
 518  * \ingroup l4_thread_api
 519  *
 520  * Add modification rules with l4_thread_modify_sender_add() and commit with
 521  * l4_thread_modify_sender_commit(). Do not touch the UTCB between
 522  * l4_thread_modify_sender_start() and l4_thread_modify_sender_commit().
 523  *
 524  * \see l4_thread_modify_sender_add
 525  * \see l4_thread_modify_sender_commit
 526  */
 527 L4_INLINE l4_msgtag_t
 528 l4_thread_modify_sender_start(void) L4_NOTHROW;
 529
 530 /**
 531  * \internal
 532  * \ingroup l4_thread_api
 533  */
 534 L4_INLINE l4_msgtag_t
 535 l4_thread_modify_sender_start_u(l4_utcb_t *u) L4_NOTHROW;
 536
 537 /**
 538  * \brief Add a modification pattern to a sender modification sequence.
 539  * \ingroup l4_thread_api
 540  *
 541  * \param tag        Tag received from l4_thread_modify_sender_start() or
 542  *                   previous l4_thread_modify_sender_add() calls from
 543  *                   the same sequence.
 544  * \param match_mask Bitmask of bits to match the label.
 545  * \param match      Bitmask that must be equal to the label after applying
 546  *                   match_mask.
 547  * \param del_bits   Bits to be deleted from the label.
 548  * \param add_bits   Bits to be added to the label.
 549  *
 550  * \return 0 on sucess, <0 on error
 551  *
 552  * In pseudo code:
 553  *   if ((sender_label & match_mask) == match)
 554  *     { label = (label & ~del_bits) | add_bits; }
 555  *
 556  * Only the first match is applied.
 557  *
 558  * \see l4_thread_modify_sender_start
 559  * \see l4_thread_modify_sender_commit
 560  */
 561 L4_INLINE int
 562 l4_thread_modify_sender_add(l4_umword_t match_mask,
 563                             l4_umword_t match,
 564                             l4_umword_t del_bits,
 565                             l4_umword_t add_bits,
 566                             l4_msgtag_t *tag) L4_NOTHROW;
 567
 568 /**
 569  * \internal
 570  * \ingroup l4_thread_api
 571  */
 572 L4_INLINE int
 573 l4_thread_modify_sender_add_u(l4_umword_t match_mask,
 574                               l4_umword_t match,
 575                               l4_umword_t del_bits,
 576                               l4_umword_t add_bits,
 577                               l4_msgtag_t *tag, l4_utcb_t *u) L4_NOTHROW;
 578
 579 /**
 580  * \brief Apply (commit) a sender modification sequence.
 581  * \ingroup l4_thread_api
 582  *
 583  * \see l4_thread_modify_sender_start
 584  * \see l4_thread_modify_sender_add
 585  */
 586 L4_INLINE l4_msgtag_t
 587 l4_thread_modify_sender_commit(l4_cap_idx_t thread, l4_msgtag_t tag) L4_NOTHROW;
 588
 589 /**
 590  * \internal
 591  * \ingroup l4_thread_api
 592  */
 593 L4_INLINE l4_msgtag_t
 594 l4_thread_modify_sender_commit_u(l4_cap_idx_t thread, l4_msgtag_t tag,
 595                                  l4_utcb_t *u) L4_NOTHROW;
 596
 597 /**
 598  * \brief Operations on thread objects.
 599  * \ingroup l4_thread_api
 600  * \hideinitializer
 601  * \internal
 602  */
 603 enum L4_thread_ops
 604 {
 605   L4_THREAD_CONTROL_OP            = 0UL,    /**< Control operation */
 606   L4_THREAD_EX_REGS_OP            = 1UL,    /**< Exchange registers operation */
 607   L4_THREAD_SWITCH_OP             = 2UL,    /**< Do a thread switch */
 608   L4_THREAD_STATS_OP              = 3UL,    /**< Thread statistics */
 609   L4_THREAD_VCPU_RESUME_OP        = 4UL,    /**< VCPU resume */
 610   L4_THREAD_REGISTER_DELETE_IRQ   = 5UL,    /**< Register an IPC-gate deletion IRQ */
 611   L4_THREAD_MODIFY_SENDER         = 6UL,    /**< Modify all senders IDs that match the given pattern */
 612   L4_THREAD_VCPU_CONTROL          = 7UL,    /**< Enable / disable VCPU feature */
 613   L4_THREAD_VCPU_CONTROL_EXT      = L4_THREAD_VCPU_CONTROL | 0x10000,
 614   L4_THREAD_GDT_X86_OP            = 0x10UL, /**< Gdt */
 615   L4_THREAD_OPCODE_MASK           = 0xffff, /**< Mask for opcodes */
 616 };
 617
 618 /**
 619  * \brief Flags for the thread control operation.
 620  * \ingroup l4_thread_api
 621  * \hideinitializer
 622  * \internal
 623  *
 624  * Values for the enabled flags need to be given in their appropriate field
 625  * in the UTCB,
 626  * \see l4_thread_control
 627  */
 628 enum L4_thread_control_flags
 629 {
 630   /** The pager will be given. */
 631   L4_THREAD_CONTROL_SET_PAGER       = 0x0010000,
 632   /** The scheduler will be given. */
 633   L4_THREAD_CONTROL_SET_SCHEDULER   = 0x0020000,
 634   /** The task to bind the thread to will be given. */
 635   L4_THREAD_CONTROL_BIND_TASK       = 0x0200000,
 636   /** Alien state of the thread is set. */
 637   L4_THREAD_CONTROL_ALIEN           = 0x0400000,
 638   /** Fiasco-UX only: pass-through of host system calls is set. */
 639   L4_THREAD_CONTROL_UX_NATIVE       = 0x0800000,
 640   /** The exception handler of the thread will be given. */
 641   L4_THREAD_CONTROL_SET_EXC_HANDLER = 0x1000000,
 642 };
 643
 644 /**
 645  * \brief Indices for the values in the message register for thread control.
 646  * \ingroup l4_thread_api
 647  * \hideinitializer
 648  * \internal
 649  *
 650  * The values indicate the index in the message registers during
 651  * thread-control operation.
 652  */
 653 enum L4_thread_control_mr_indices
 654 {
 655   L4_THREAD_CONTROL_MR_IDX_FLAGS       = 0, /**< \see #L4_thread_control_flags. */
 656   L4_THREAD_CONTROL_MR_IDX_PAGER       = 1, /**< Index for pager cap */
 657   L4_THREAD_CONTROL_MR_IDX_EXC_HANDLER = 2, /**< Index for exception handler */
 658   L4_THREAD_CONTROL_MR_IDX_SCHEDULER   = 3, /**< Index for scheduler */
 659   L4_THREAD_CONTROL_MR_IDX_FLAG_VALS   = 4, /**< Index for feature values */
 660   L4_THREAD_CONTROL_MR_IDX_BIND_UTCB   = 5, /**< Index for UTCB address for bind */
 661   L4_THREAD_CONTROL_MR_IDX_BIND_TASK   = 6, /**< Index for task flex-page for bind */
 662 };
 663
 664 /**
 665  * \brief Flags for the thread ex-regs operation.
 666  * \ingroup l4_thread_api
 667  * \hideinitializer
 668  */
 669 enum L4_thread_ex_regs_flags
 670 {
 671   L4_THREAD_EX_REGS_CANCEL            = 0x10000UL, /**< Cancel ongoing IPC in the thread. */
 672   L4_THREAD_EX_REGS_TRIGGER_EXCEPTION = 0x20000UL, /**< Trigger artificial exception in thread. */
 673 };
 674
 675
 676 /* IMPLEMENTATION -----------------------------------------------------------*/
 677
 678 #include <l4/sys/ipc.h>
 679 #include <l4/sys/types.h>
 680
 681 L4_INLINE l4_msgtag_t
 682 l4_thread_ex_regs_u(l4_cap_idx_t thread, l4_addr_t ip, l4_addr_t sp,
 683                     l4_umword_t flags, l4_utcb_t *utcb) L4_NOTHROW
 684 {
 685   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 686   v->mr[0] = L4_THREAD_EX_REGS_OP | flags;
 687   v->mr[1] = ip;
 688   v->mr[2] = sp;
 689   return l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 3, 0, 0), L4_IPC_NEVER);
 690 }
 691
 692 L4_INLINE l4_msgtag_t
 693 l4_thread_ex_regs_ret_u(l4_cap_idx_t thread, l4_addr_t *ip, l4_addr_t *sp,
 694                         l4_umword_t *flags, l4_utcb_t *utcb) L4_NOTHROW
 695 {
 696   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 697   l4_msgtag_t ret = l4_thread_ex_regs_u(thread, *ip, *sp, *flags, utcb);
 698   if (l4_error_u(ret, utcb))
 699     return ret;
 700
 701   *flags = v->mr[0];
 702   *ip    = v->mr[1];
 703   *sp    = v->mr[2];
 704   return ret;
 705 }
 706
 707 L4_INLINE void
 708 l4_thread_control_start_u(l4_utcb_t *utcb) L4_NOTHROW
 709 {
 710   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 711   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS] = L4_THREAD_CONTROL_OP;
 712 }
 713
 714 L4_INLINE void
 715 l4_thread_control_pager_u(l4_cap_idx_t pager, l4_utcb_t *utcb) L4_NOTHROW
 716 {
 717   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 718   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS] |= L4_THREAD_CONTROL_SET_PAGER;
 719   v->mr[L4_THREAD_CONTROL_MR_IDX_PAGER]  = pager;
 720 }
 721
 722 L4_INLINE void
 723 l4_thread_control_exc_handler_u(l4_cap_idx_t exc_handler,
 724                                 l4_utcb_t *utcb) L4_NOTHROW
 725 {
 726   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 727   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS]       |= L4_THREAD_CONTROL_SET_EXC_HANDLER;
 728   v->mr[L4_THREAD_CONTROL_MR_IDX_EXC_HANDLER]  = exc_handler;
 729 }
 730
 731 L4_INLINE void
 732 l4_thread_control_scheduler_u(l4_cap_idx_t scheduler, l4_utcb_t *utcb) L4_NOTHROW
 733 {
 734   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 735   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS]     |= L4_THREAD_CONTROL_SET_SCHEDULER;
 736   v->mr[L4_THREAD_CONTROL_MR_IDX_SCHEDULER]  = scheduler;
 737 }
 738
 739 L4_INLINE void
 740 l4_thread_control_bind_u(l4_utcb_t *thread_utcb, l4_cap_idx_t task,
 741                          l4_utcb_t *utcb) L4_NOTHROW
 742 {
 743   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 744   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS]         |= L4_THREAD_CONTROL_BIND_TASK;
 745   v->mr[L4_THREAD_CONTROL_MR_IDX_BIND_UTCB]      = (l4_addr_t)thread_utcb;
 746   v->mr[L4_THREAD_CONTROL_MR_IDX_BIND_TASK]      = L4_ITEM_MAP;
 747   v->mr[L4_THREAD_CONTROL_MR_IDX_BIND_TASK + 1]  = l4_obj_fpage(task, 0, L4_FPAGE_RWX).raw;
 748 }
 749
 750 L4_INLINE void
 751 l4_thread_control_alien_u(l4_utcb_t *utcb, int on) L4_NOTHROW
 752 {
 753   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 754   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS]     |= L4_THREAD_CONTROL_ALIEN;
 755   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAG_VALS] |= on ? L4_THREAD_CONTROL_ALIEN : 0;
 756 }
 757
 758 L4_INLINE void
 759 l4_thread_control_ux_host_syscall_u(l4_utcb_t *utcb, int on) L4_NOTHROW
 760 {
 761   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 762   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS]     |= L4_THREAD_CONTROL_UX_NATIVE;
 763   v->mr[L4_THREAD_CONTROL_MR_IDX_FLAG_VALS] |= on ? L4_THREAD_CONTROL_UX_NATIVE : 0;
 764 }
 765
 766 L4_INLINE l4_msgtag_t
 767 l4_thread_control_commit_u(l4_cap_idx_t thread, l4_utcb_t *utcb) L4_NOTHROW
 768 {
 769   int items = 0;
 770   if (l4_utcb_mr_u(utcb)->mr[L4_THREAD_CONTROL_MR_IDX_FLAGS] & L4_THREAD_CONTROL_BIND_TASK)
 771     items = 1;
 772   return l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 6, items, 0), L4_IPC_NEVER);
 773 }
 774
 775
 776 L4_INLINE l4_msgtag_t
 777 l4_thread_yield(void) L4_NOTHROW
 778 {
 779   l4_ipc_receive(L4_INVALID_CAP, NULL, L4_IPC_BOTH_TIMEOUT_0);
 780   return l4_msgtag(0, 0, 0, 0);
 781 }
 782
 783 /* Preliminary, to be changed */
 784 L4_INLINE l4_msgtag_t
 785 l4_thread_switch_u(l4_cap_idx_t to_thread, l4_utcb_t *utcb) L4_NOTHROW
 786 {
 787   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 788   v->mr[0] = L4_THREAD_SWITCH_OP;
 789   return l4_ipc_call(to_thread, utcb, l4_msgtag(L4_PROTO_THREAD, 1, 0, 0), L4_IPC_NEVER);
 790 }
 791
 792
 793 L4_INLINE l4_msgtag_t
 794 l4_thread_stats_time_u(l4_cap_idx_t thread, l4_utcb_t *utcb) L4_NOTHROW
 795 {
 796   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 797   v->mr[0] = L4_THREAD_STATS_OP;
 798   return l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 1, 0, 0), L4_IPC_NEVER);
 799 }
 800
 801 L4_INLINE l4_msgtag_t
 802 l4_thread_vcpu_resume_start_u(l4_utcb_t *utcb) L4_NOTHROW
 803 {
 804   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 805   v->mr[0] = L4_THREAD_VCPU_RESUME_OP;
 806   return l4_msgtag(L4_PROTO_THREAD, 1, 0, 0);
 807 }
 808
 809 L4_INLINE l4_msgtag_t
 810 l4_thread_vcpu_resume_commit_u(l4_cap_idx_t thread,
 811                                l4_msgtag_t tag, l4_utcb_t *utcb) L4_NOTHROW
 812 {
 813   return l4_ipc_call(thread, utcb, tag, L4_IPC_NEVER);
 814 }
 815
 816 L4_INLINE l4_msgtag_t
 817 l4_thread_ex_regs(l4_cap_idx_t thread, l4_addr_t ip, l4_addr_t sp,
 818                     l4_umword_t flags) L4_NOTHROW
 819 {
 820   return l4_thread_ex_regs_u(thread, ip, sp, flags, l4_utcb());
 821 }
 822
 823 L4_INLINE l4_msgtag_t
 824 l4_thread_ex_regs_ret(l4_cap_idx_t thread, l4_addr_t *ip, l4_addr_t *sp,
 825                       l4_umword_t *flags) L4_NOTHROW
 826 {
 827   return l4_thread_ex_regs_ret_u(thread, ip, sp, flags, l4_utcb());
 828 }
 829
 830 L4_INLINE void
 831 l4_thread_control_start(void) L4_NOTHROW
 832 {
 833   l4_thread_control_start_u(l4_utcb());
 834 }
 835
 836 L4_INLINE void
 837 l4_thread_control_pager(l4_cap_idx_t pager) L4_NOTHROW
 838 {
 839   l4_thread_control_pager_u(pager, l4_utcb());
 840 }
 841
 842 L4_INLINE void
 843 l4_thread_control_exc_handler(l4_cap_idx_t exc_handler) L4_NOTHROW
 844 {
 845   l4_thread_control_exc_handler_u(exc_handler, l4_utcb());
 846 }
 847
 848 L4_INLINE void
 849 l4_thread_control_scheduler(l4_cap_idx_t scheduler) L4_NOTHROW
 850 {
 851   l4_thread_control_scheduler_u(scheduler, l4_utcb());
 852 }
 853
 854
 855 L4_INLINE void
 856 l4_thread_control_bind(l4_utcb_t *thread_utcb, l4_cap_idx_t task) L4_NOTHROW
 857 {
 858   l4_thread_control_bind_u(thread_utcb, task, l4_utcb());
 859 }
 860
 861 L4_INLINE void
 862 l4_thread_control_alien(int on) L4_NOTHROW
 863 {
 864   l4_thread_control_alien_u(l4_utcb(), on);
 865 }
 866
 867 L4_INLINE void
 868 l4_thread_control_ux_host_syscall(int on) L4_NOTHROW
 869 {
 870   l4_thread_control_ux_host_syscall_u(l4_utcb(), on);
 871 }
 872
 873 L4_INLINE l4_msgtag_t
 874 l4_thread_control_commit(l4_cap_idx_t thread) L4_NOTHROW
 875 {
 876   return l4_thread_control_commit_u(thread, l4_utcb());
 877 }
 878
 879
 880
 881
 882 L4_INLINE l4_msgtag_t
 883 l4_thread_switch(l4_cap_idx_t to_thread) L4_NOTHROW
 884 {
 885   return l4_thread_switch_u(to_thread, l4_utcb());
 886 }
 887
 888
 889
 890
 891 L4_INLINE l4_msgtag_t
 892 l4_thread_stats_time(l4_cap_idx_t thread) L4_NOTHROW
 893 {
 894   return l4_thread_stats_time_u(thread, l4_utcb());
 895 }
 896
 897 L4_INLINE l4_msgtag_t
 898 l4_thread_vcpu_resume_start(void) L4_NOTHROW
 899 {
 900   return l4_thread_vcpu_resume_start_u(l4_utcb());
 901 }
 902
 903 L4_INLINE l4_msgtag_t
 904 l4_thread_vcpu_resume_commit(l4_cap_idx_t thread,
 905                              l4_msgtag_t tag) L4_NOTHROW
 906 {
 907   return l4_thread_vcpu_resume_commit_u(thread, tag, l4_utcb());
 908 }
 909
 910
 911 L4_INLINE l4_msgtag_t
 912 l4_thread_register_del_irq_u(l4_cap_idx_t thread, l4_cap_idx_t irq,
 913                              l4_utcb_t *u) L4_NOTHROW
 914 {
 915   l4_msg_regs_t *m = l4_utcb_mr_u(u);
 916   m->mr[0] = L4_THREAD_REGISTER_DELETE_IRQ;
 917   m->mr[1] = l4_map_obj_control(0,0);
 918   m->mr[2] = l4_obj_fpage(irq, 0, L4_CAP_FPAGE_RWS).raw;
 919   return l4_ipc_call(thread, u, l4_msgtag(L4_PROTO_THREAD, 1, 1, 0), L4_IPC_NEVER);
 920
 921 }
 922
 923 L4_INLINE l4_msgtag_t
 924 l4_thread_register_del_irq(l4_cap_idx_t thread, l4_cap_idx_t irq) L4_NOTHROW
 925 {
 926   return l4_thread_register_del_irq_u(thread, irq, l4_utcb());
 927 }
 928
 929
 930 L4_INLINE l4_msgtag_t
 931 l4_thread_vcpu_control_u(l4_cap_idx_t thread, l4_addr_t vcpu_state,
 932                          l4_utcb_t *utcb) L4_NOTHROW
 933 {
 934   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 935   v->mr[0] = L4_THREAD_VCPU_CONTROL;
 936   v->mr[1] = vcpu_state;
 937   return l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 2, 0, 0), L4_IPC_NEVER);
 938 }
 939
 940 L4_INLINE l4_msgtag_t
 941 l4_thread_vcpu_control(l4_cap_idx_t thread, l4_addr_t vcpu_state) L4_NOTHROW
 942 { return l4_thread_vcpu_control_u(thread, vcpu_state, l4_utcb()); }
 943
 944
 945 L4_INLINE l4_msgtag_t
 946 l4_thread_vcpu_control_ext_u(l4_cap_idx_t thread, l4_addr_t ext_vcpu_state,
 947                              l4_utcb_t *utcb) L4_NOTHROW
 948 {
 949   l4_msg_regs_t *v = l4_utcb_mr_u(utcb);
 950   v->mr[0] = L4_THREAD_VCPU_CONTROL_EXT;
 951   v->mr[1] = ext_vcpu_state;
 952   return l4_ipc_call(thread, utcb, l4_msgtag(L4_PROTO_THREAD, 2, 0, 0), L4_IPC_NEVER);
 953 }
 954
 955 L4_INLINE l4_msgtag_t
 956 l4_thread_vcpu_control_ext(l4_cap_idx_t thread, l4_addr_t ext_vcpu_state) L4_NOTHROW
 957 { return l4_thread_vcpu_control_ext_u(thread, ext_vcpu_state, l4_utcb()); }
 958
 959 L4_INLINE l4_msgtag_t
 960 l4_thread_modify_sender_start_u(l4_utcb_t *u) L4_NOTHROW
 961 {
 962   l4_msg_regs_t *m = l4_utcb_mr_u(u);
 963   m->mr[0] = L4_THREAD_MODIFY_SENDER;
 964   return l4_msgtag(L4_PROTO_THREAD, 1, 0, 0);
 965 }
 966
 967 L4_INLINE int
 968 l4_thread_modify_sender_add_u(l4_umword_t match_mask,
 969                               l4_umword_t match,
 970                               l4_umword_t del_bits,
 971                               l4_umword_t add_bits,
 972                               l4_msgtag_t *tag, l4_utcb_t *u) L4_NOTHROW
 973 {
 974   l4_msg_regs_t *m = l4_utcb_mr_u(u);
 975   unsigned w = l4_msgtag_words(*tag);
 976   if (w >= L4_UTCB_GENERIC_DATA_SIZE - 4)
 977     return -L4_ENOMEM;
 978
 979   m->mr[w]   = match_mask;
 980   m->mr[w+1] = match;
 981   m->mr[w+2] = del_bits;
 982   m->mr[w+3] = add_bits;
 983
 984   *tag = l4_msgtag(l4_msgtag_label(*tag), w + 4, 0, 0);
 985
 986   return 0;
 987 }
 988
 989 L4_INLINE l4_msgtag_t
 990 l4_thread_modify_sender_commit_u(l4_cap_idx_t thread, l4_msgtag_t tag,
 991                                  l4_utcb_t *u) L4_NOTHROW
 992 {
 993   return l4_ipc_call(thread, u, tag, L4_IPC_NEVER);
 994 }
 995
 996 L4_INLINE l4_msgtag_t
 997 l4_thread_modify_sender_start(void) L4_NOTHROW
 998 {
 999   return l4_thread_modify_sender_start_u(l4_utcb());
1000 }
1001
1002 L4_INLINE int
1003 l4_thread_modify_sender_add(l4_umword_t match_mask,
1004                             l4_umword_t match,
1005                             l4_umword_t del_bits,
1006                             l4_umword_t add_bits,
1007                             l4_msgtag_t *tag) L4_NOTHROW
1008 {
1009   return l4_thread_modify_sender_add_u(match_mask, match,
1010                                        del_bits, add_bits, tag, l4_utcb());
1011 }
1012
1013 L4_INLINE l4_msgtag_t
1014 l4_thread_modify_sender_commit(l4_cap_idx_t thread, l4_msgtag_t tag) L4_NOTHROW
1015 {
1016   return l4_thread_modify_sender_commit_u(thread, tag, l4_utcb());
1017 }