bertos/cpu/irq.h

   1 /**
   2  * \file
   3  * <!--
   4  * This file is part of BeRTOS.
   5  *
   6  * Bertos is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * As a special exception, you may use this file as part of a free software
  21  * library without restriction.  Specifically, if other files instantiate
  22  * templates or use macros or inline functions from this file, or you compile
  23  * this file and link it with other files to produce an executable, this
  24  * file does not by itself cause the resulting executable to be covered by
  25  * the GNU General Public License.  This exception does not however
  26  * invalidate any other reasons why the executable file might be covered by
  27  * the GNU General Public License.
  28  *
  29  * Copyright 2004, 2005, 2006, 2007 Develer S.r.l. (http://www.develer.com/)
  30  * Copyright 2004 Giovanni Bajo
  31  *
  32  * -->
  33  *
  34  * \brief CPU-specific IRQ definitions.
  35  *
  36  * \author Giovanni Bajo <rasky@develer.com>
  37  * \author Bernie Innocenti <bernie@codewiz.org>
  38  * \author Stefano Fedrigo <aleph@develer.com>
  39  * \author Francesco Sacchi <batt@develer.com>
  40  */
  41 #ifndef CPU_IRQ_H
  42 #define CPU_IRQ_H
  43
  44 #include "detect.h"
  45 #include "types.h"
  46
  47 #include <kern/proc.h> /* proc_needPreempt() / proc_preempt() */
  48
  49 #include <cfg/compiler.h> /* for uintXX_t */
  50 #include "cfg/cfg_proc.h" /* CONFIG_KERN_PREEMPT */
  51
  52 #if CPU_I196
  53         #define IRQ_DISABLE             disable_interrupt()
  54         #define IRQ_ENABLE              enable_interrupt()
  55 #elif CPU_X86
  56
  57         /* Get IRQ_* definitions from the hosting environment. */
  58         #include <cfg/os.h>
  59         #if OS_EMBEDDED
  60                 #define IRQ_DISABLE             FIXME
  61                 #define IRQ_ENABLE              FIXME
  62                 #define IRQ_SAVE_DISABLE(x)     FIXME
  63                 #define IRQ_RESTORE(x)          FIXME
  64         #endif /* OS_EMBEDDED */
  65
  66 #elif CPU_CM3
  67         /* Cortex-M3 */
  68
  69         /*
  70          * Interrupt priority.
  71          *
  72          * NOTE: 0 means that an interrupt is not affected by the global IRQ
  73          * priority settings.
  74          */
  75         #define IRQ_PRIO                    0x80
  76         #define IRQ_PRIO_MIN            0xf0
  77         #define IRQ_PRIO_MAX            0
  78         /*
  79          * To disable interrupts we just raise the system base priority to a
  80          * number lower than the default IRQ priority. In this way, all the
  81          * "normal" interrupt can't be triggered. High-priority interrupt can
  82          * still happen (at the moment only the soft-interrupt svcall uses a
  83          * priority greater than the default IRQ priority).
  84          *
  85          * To enable interrupts we set the system base priority to 0, that
  86          * means IRQ priority mechanism is disabled, and any interrupt can
  87          * happen.
  88          */
  89         #define IRQ_PRIO_DISABLED       0x40
  90         #define IRQ_PRIO_ENABLED        0
  91
  92         #ifdef __IAR_SYSTEMS_ICC__
  93                 INLINE cpu_flags_t CPU_READ_FLAGS(void)
  94                 {
  95                         return __get_BASEPRI();
  96                 }
  97
  98                 INLINE void CPU_WRITE_FLAGS(cpu_flags_t flags)
  99                 {
 100                         __set_BASEPRI(flags);
 101                 }
 102
 103                 extern uint32_t CPU_READ_IPSR(void);
 104                 extern bool irq_running(void);
 105
 106                 #define IRQ_DISABLE     CPU_WRITE_FLAGS(IRQ_PRIO_DISABLED)
 107
 108                 #define IRQ_ENABLE      CPU_WRITE_FLAGS(IRQ_PRIO_ENABLED)
 109
 110                 #define IRQ_SAVE_DISABLE(x)                                     \
 111                 do {                                                            \
 112                         x = CPU_READ_FLAGS();                                   \
 113                         IRQ_DISABLE;                                            \
 114                 } while (0)
 115
 116                 #define IRQ_RESTORE(x)                                          \
 117                 do {                                                            \
 118                         CPU_WRITE_FLAGS(x);                                     \
 119                 } while (0)
 120         #else /* !__IAR_SYSTEMS_ICC__ */
 121                 #define IRQ_DISABLE                                             \
 122                 ({                                                              \
 123                         register cpu_flags_t reg = IRQ_PRIO_DISABLED;           \
 124                         asm volatile (                                          \
 125                                 "msr basepri, %0"                               \
 126                                 : : "r"(reg) : "memory", "cc");                 \
 127                 })
 128
 129                 #define IRQ_ENABLE                                              \
 130                 ({                                                              \
 131                         register cpu_flags_t reg = IRQ_PRIO_ENABLED;            \
 132                         asm volatile (                                          \
 133                                 "msr basepri, %0"                               \
 134                                 : : "r"(reg) : "memory", "cc");                 \
 135                 })
 136
 137                 #define CPU_READ_FLAGS()                                        \
 138                 ({                                                              \
 139                         register cpu_flags_t reg;                               \
 140                         asm volatile (                                          \
 141                                 "mrs %0, basepri"                               \
 142                                  : "=r"(reg) : : "memory", "cc");               \
 143                         reg;                                                    \
 144                 })
 145
 146                 #define IRQ_SAVE_DISABLE(x)                                     \
 147                 ({                                                              \
 148                         x = CPU_READ_FLAGS();                                   \
 149                         IRQ_DISABLE;                                            \
 150                 })
 151
 152                 #define IRQ_RESTORE(x)                                          \
 153                 ({                                                              \
 154                         asm volatile (                                          \
 155                                 "msr basepri, %0"                               \
 156                                 : : "r"(x) : "memory", "cc");                   \
 157                 })
 158
 159                 INLINE bool irq_running(void)
 160                 {
 161                         register uint32_t ret;
 162
 163                         /*
 164                          * Check if the current stack pointer is the main stack or
 165                          * process stack: we use the main stack only in Handler mode,
 166                          * so this means we're running inside an ISR.
 167                          */
 168                         asm volatile (
 169                                 "mrs %0, msp\n\t"
 170                                 "cmp sp, %0\n\t"
 171                                 "ite ne\n\t"
 172                                 "movne %0, #0\n\t"
 173                                 "moveq %0, #1\n\t" : "=r"(ret) : : "cc");
 174                         return ret;
 175                 }
 176         #endif /* __IAR_SYSTEMS_ICC__ */
 177
 178         #define IRQ_ENABLED() (CPU_READ_FLAGS() == IRQ_PRIO_ENABLED)
 179
 180         #define IRQ_RUNNING() irq_running()
 181
 182         #if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
 183
 184                 #define DECLARE_ISR_CONTEXT_SWITCH(func)                \
 185                 void func(void);                                        \
 186                 INLINE void __isr_##func(void);                         \
 187                 void func(void)                                         \
 188                 {                                                       \
 189                         __isr_##func();                                 \
 190                         if (!proc_needPreempt())                        \
 191                                 return;                                 \
 192                         /*
 193                          * Set a PendSV request.
 194                          *
 195                          * The preemption handler will be called immediately
 196                          * after this ISR in tail-chaining mode (without the
 197                          * overhead of hardware state saving and restoration
 198                          * between interrupts).
 199                          */                                             \
 200                         HWREG(NVIC_INT_CTRL) = NVIC_INT_CTRL_PEND_SV;   \
 201                 }                                                       \
 202                 INLINE void __isr_##func(void)
 203
 204                 /**
 205                  * With task priorities enabled each ISR is used a point to
 206                  * check if we need to perform a context switch.
 207                  *
 208                  * Instead, without priorities a context switch can occur only
 209                  * when the running task expires its time quantum. In this last
 210                  * case, the context switch can only occur in the timer ISR,
 211                  * that must be always declared with the
 212                  * DECLARE_ISR_CONTEXT_SWITCH() macro.
 213                  */
 214                 #if CONFIG_KERN_PRI
 215                         #define DECLARE_ISR(func) \
 216                                 DECLARE_ISR_CONTEXT_SWITCH(func)
 217                         /**
 218                          * Interrupt service routine prototype: can be used for
 219                          * forward declarations.
 220                          */
 221                         #define ISR_PROTO(func) \
 222                                 ISR_PROTO_CONTEXT_SWITCH(func)
 223                 #endif /* !CONFIG_KERN_PRI */
 224         #endif
 225
 226         #ifndef ISR_PROTO
 227                 #define ISR_PROTO(func) void func(void)
 228         #endif
 229         #ifndef DECLARE_ISR
 230                 #define DECLARE_ISR(func) void func(void)
 231         #endif
 232         #ifndef DECLARE_ISR_CONTEXT_SWITCH
 233                 #define DECLARE_ISR_CONTEXT_SWITCH(func) void func(void)
 234         #endif
 235         #ifndef ISR_PROTO_CONTEXT_SWITCH
 236                 #define ISR_PROTO_CONTEXT_SWITCH(func) void func(void)
 237         #endif
 238
 239 #elif CPU_ARM
 240
 241         #ifdef __IAR_SYSTEMS_ICC__
 242
 243                 #include <inarm.h>
 244
 245                 #if __CPU_MODE__ == 1 /* Thumb */
 246                         /* Use stubs */
 247                         extern cpu_flags_t get_CPSR(void);
 248                         extern void set_CPSR(cpu_flags_t flags);
 249                 #else
 250                         #define get_CPSR __get_CPSR
 251                         #define set_CPSR __set_CPSR
 252                 #endif
 253
 254                 #define IRQ_DISABLE __disable_interrupt()
 255                 #define IRQ_ENABLE  __enable_interrupt()
 256
 257                 #define IRQ_SAVE_DISABLE(x) \
 258                 do { \
 259                         (x) = get_CPSR(); \
 260                         __disable_interrupt(); \
 261                 } while (0)
 262
 263                 #define IRQ_RESTORE(x) \
 264                 do { \
 265                         set_CPSR(x); \
 266                 } while (0)
 267
 268                 #define IRQ_ENABLED() \
 269                         ((bool)(get_CPSR() & 0xb0))
 270
 271         #else /* !__IAR_SYSTEMS_ICC__ */
 272
 273                 #define IRQ_DISABLE                                     \
 274                 do {                                                    \
 275                         cpu_flags_t sreg;                               \
 276                         asm volatile (                                  \
 277                                 "mrs %0, cpsr\n\t"                      \
 278                                 "orr %0, %0, #0xc0\n\t"                 \
 279                                 "msr cpsr_c, %0\n\t"                    \
 280                                 : "=r" (sreg) : : "memory", "cc");      \
 281                 } while (0)
 282
 283                 #define IRQ_ENABLE                                      \
 284                 do {                                                    \
 285                         cpu_flags_t sreg;                               \
 286                         asm volatile (                                  \
 287                                 "mrs %0, cpsr\n\t"                      \
 288                                 "bic %0, %0, #0xc0\n\t"                 \
 289                                 "msr cpsr_c, %0\n\t"                    \
 290                                 : "=r" (sreg) : : "memory", "cc");      \
 291                 } while (0)
 292
 293                 #define IRQ_SAVE_DISABLE(x)                             \
 294                 do {                                                    \
 295                         register cpu_flags_t sreg;                      \
 296                         asm volatile (                                  \
 297                                 "mrs %0, cpsr\n\t"                      \
 298                                 "orr %1, %0, #0xc0\n\t"                 \
 299                                 "msr cpsr_c, %1\n\t"                    \
 300                                 : "=r" (x), "=r" (sreg)                 \
 301                                 : : "memory", "cc");                    \
 302                 } while (0)
 303
 304                 #define IRQ_RESTORE(x)                                  \
 305                 do {                                                    \
 306                         asm volatile (                                  \
 307                                 "msr cpsr_c, %0\n\t"                    \
 308                                 : : "r" (x) : "memory", "cc");          \
 309                 } while (0)
 310
 311                 #define CPU_READ_FLAGS()                                \
 312                 ({                                                      \
 313                         cpu_flags_t sreg;                               \
 314                         asm volatile (                                  \
 315                                 "mrs %0, cpsr\n\t"                      \
 316                                 : "=r" (sreg) : : "memory", "cc");      \
 317                         sreg;                                           \
 318                 })
 319
 320                 #define IRQ_ENABLED() ((CPU_READ_FLAGS() & 0xc0) != 0xc0)
 321
 322                 #if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
 323                         EXTERN_C void asm_irq_switch_context(void);
 324
 325                         /**
 326                          * At the beginning of any ISR immediately ajust the
 327                          * return address and store all the caller-save
 328                          * registers (the ISR may change these registers that
 329                          * are shared with the user-context).
 330                          */
 331                         #define IRQ_ENTRY() asm volatile ( \
 332                                                 "sub    lr, lr, #4\n\t" \
 333                                                 "stmfd  sp!, {r0-r3, ip, lr}\n\t")
 334                         #define IRQ_EXIT()  asm volatile ( \
 335                                                 "b      asm_irq_switch_context\n\t")
 336                         /**
 337                          * Function attribute to declare an interrupt service
 338                          * routine.
 339                          *
 340                          * An ISR function must be declared as naked because we
 341                          * want to add our IRQ_ENTRY() prologue and IRQ_EXIT()
 342                          * epilogue code to handle the context switch and save
 343                          * all the registers (not only the callee-save).
 344                          *
 345                          */
 346                         #define ISR_FUNC __attribute__((naked))
 347
 348                         /**
 349                          * The compiler cannot establish which
 350                          * registers actually need to be saved, because
 351                          * the interrupt can happen at any time, so the
 352                          * "normal" prologue and epilogue used for a
 353                          * generic function call are not suitable for
 354                          * the ISR.
 355                          *
 356                          * Using a naked function has the drawback that
 357                          * the stack is not automatically adjusted at
 358                          * this point, like a "normal" function call.
 359                          *
 360                          * So, an ISR can _only_ contain other function
 361                          * calls and they can't use the stack in any
 362                          * other way.
 363                          *
 364                          * NOTE: we need to explicitly disable IRQs after
 365                          * IRQ_ENTRY(), because the IRQ status flag is not
 366                          * masked by the hardware and an IRQ ack inside the ISR
 367                          * may cause the triggering of another IRQ before
 368                          * exiting from the current ISR.
 369                          *
 370                          * The respective IRQ_ENABLE is not necessary, because
 371                          * IRQs will be automatically re-enabled when restoring
 372                          * the context of the user task.
 373                          */
 374                         #define DECLARE_ISR_CONTEXT_SWITCH(func)                \
 375                                 void ISR_FUNC func(void);                       \
 376                                 static NOINLINE void __isr_##func(void);        \
 377                                 void ISR_FUNC func(void)                        \
 378                                 {                                               \
 379                                         IRQ_ENTRY();                            \
 380                                         IRQ_DISABLE;                            \
 381                                         __isr_##func();                         \
 382                                         IRQ_EXIT();                             \
 383                                 }                                               \
 384                                 static NOINLINE void __isr_##func(void)
 385                         /**
 386                          * Interrupt service routine prototype: can be used for
 387                          * forward declarations.
 388                          */
 389                         #define ISR_PROTO_CONTEXT_SWITCH(func)  \
 390                                 void ISR_FUNC func(void)
 391                         /**
 392                          * With task priorities enabled each ISR is used a point to
 393                          * check if we need to perform a context switch.
 394                          *
 395                          * Instead, without priorities a context switch can occur only
 396                          * when the running task expires its time quantum. In this last
 397                          * case, the context switch can only occur in the timer
 398                          * ISR, that must be always declared with the
 399                          * DECLARE_ISR_CONTEXT_SWITCH() macro.
 400                          */
 401                         #if CONFIG_KERN_PRI
 402                                 #define DECLARE_ISR(func) \
 403                                         DECLARE_ISR_CONTEXT_SWITCH(func)
 404
 405                                 #define ISR_PROTO(func) \
 406                                         ISR_PROTO_CONTEXT_SWITCH(func)
 407                         #endif /* !CONFIG_KERN_PRI */
 408                 #endif /* CONFIG_KERN_PREEMPT */
 409
 410                 #ifndef ISR_FUNC
 411                         #define ISR_FUNC __attribute__((naked))
 412                 #endif
 413                 #ifndef DECLARE_ISR
 414                         #define DECLARE_ISR(func) \
 415                                 void ISR_FUNC func(void);                               \
 416                                 /*                                                      \
 417                                  * FIXME: avoid the inlining of this function.          \
 418                                  *                                                      \
 419                                  * This is terribly inefficient, but it's a             \
 420                                  * reliable workaround to avoid gcc blowing             \
 421                                  * away the stack (see the bug below):                  \
 422                                  *                                                      \
 423                                  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41999    \
 424                                  */                                                     \
 425                                 static NOINLINE void __isr_##func(void);                \
 426                                 void ISR_FUNC func(void)                                \
 427                                 {                                                       \
 428                                         asm volatile (                                  \
 429                                                 "sub    lr, lr, #4\n\t"                 \
 430                                                 "stmfd  sp!, {r0-r3, ip, lr}\n\t");     \
 431                                         __isr_##func();                                 \
 432                                         asm volatile (                                  \
 433                                                 "ldmfd sp!, {r0-r3, ip, pc}^\n\t");     \
 434                                 }                                                       \
 435                                 static NOINLINE void __isr_##func(void)
 436                 #endif
 437                 #ifndef DECLARE_ISR_CONTEXT_SWITCH
 438                         #define DECLARE_ISR_CONTEXT_SWITCH(func) DECLARE_ISR(func)
 439                 #endif
 440                 #ifndef ISR_PROTO
 441                         #define ISR_PROTO(func) void ISR_FUNC func(void)
 442                 #endif
 443                 #ifndef ISR_PROTO_CONTEXT_SWITCH
 444                         #define ISR_PROTO_CONTEXT_SWITCH(func) ISR_PROTO(func)
 445                 #endif
 446
 447         #endif /* !__IAR_SYSTEMS_ICC_ */
 448
 449 #elif CPU_PPC
 450
 451         /* Get IRQ_* definitions from the hosting environment. */
 452         #include <cfg/os.h>
 453         #if OS_EMBEDDED
 454                 #define IRQ_DISABLE         FIXME
 455                 #define IRQ_ENABLE          FIXME
 456                 #define IRQ_SAVE_DISABLE(x) FIXME
 457                 #define IRQ_RESTORE(x)      FIXME
 458                 #define IRQ_ENABLED()       FIXME
 459         #endif /* OS_EMBEDDED */
 460
 461 #elif CPU_DSP56K
 462
 463         #define IRQ_DISABLE             do { asm(bfset #0x0200,SR); asm(nop); } while (0)
 464         #define IRQ_ENABLE              do { asm(bfclr #0x0200,SR); asm(nop); } while (0)
 465
 466         #define IRQ_SAVE_DISABLE(x)  \
 467                 do { (void)x; asm(move SR,x); asm(bfset #0x0200,SR); } while (0)
 468         #define IRQ_RESTORE(x)  \
 469                 do { (void)x; asm(move x,SR); } while (0)
 470
 471         static inline bool irq_running(void)
 472         {
 473                 extern void *user_sp;
 474                 return !!user_sp;
 475         }
 476         #define IRQ_RUNNING() irq_running()
 477
 478         static inline bool irq_enabled(void)
 479         {
 480                 uint16_t x;
 481                 asm(move SR,x);
 482                 return !(x & 0x0200);
 483         }
 484         #define IRQ_ENABLED() irq_enabled()
 485
 486 #elif CPU_AVR
 487
 488         #define IRQ_DISABLE   asm volatile ("cli" ::)
 489         #define IRQ_ENABLE    asm volatile ("sei" ::)
 490
 491         #define IRQ_SAVE_DISABLE(x) \
 492         do { \
 493                 __asm__ __volatile__( \
 494                         "in %0,__SREG__\n\t" \
 495                         "cli" \
 496                         : "=r" (x) : /* no inputs */ : "cc" \
 497                 ); \
 498         } while (0)
 499
 500         #define IRQ_RESTORE(x) \
 501         do { \
 502                 __asm__ __volatile__( \
 503                         "out __SREG__,%0" : /* no outputs */ : "r" (x) : "cc" \
 504                 ); \
 505         } while (0)
 506
 507         #define IRQ_ENABLED() \
 508         ({ \
 509                 uint8_t sreg; \
 510                 __asm__ __volatile__( \
 511                         "in %0,__SREG__\n\t" \
 512                         : "=r" (sreg)  /* no inputs & no clobbers */ \
 513                 ); \
 514                 (bool)(sreg & 0x80); \
 515         })
 516         #if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
 517                 #define DECLARE_ISR_CONTEXT_SWITCH(vect)                \
 518                         INLINE void __isr_##vect(void);                 \
 519                         ISR(vect)                                       \
 520                         {                                               \
 521                                 __isr_##vect();                         \
 522                                 IRQ_PREEMPT_HANDLER();                  \
 523                         }                                               \
 524                         INLINE void __isr_##vect(void)
 525
 526                 /**
 527                  * With task priorities enabled each ISR is used a point to
 528                  * check if we need to perform a context switch.
 529                  *
 530                  * Instead, without priorities a context switch can occur only
 531                  * when the running task expires its time quantum. In this last
 532                  * case, the context switch can only occur in the timer ISR,
 533                  * that must be always declared with the
 534                  * DECLARE_ISR_CONTEXT_SWITCH() macro.
 535                  */
 536                 #if CONFIG_KERN_PRI
 537                         #define DECLARE_ISR(func) \
 538                                 DECLARE_ISR_CONTEXT_SWITCH(func)
 539                         /**
 540                          * Interrupt service routine prototype: can be used for
 541                          * forward declarations.
 542                          */
 543                         #define ISR_PROTO(func) \
 544                                 ISR_PROTO_CONTEXT_SWITCH(func)
 545                 #endif /* !CONFIG_KERN_PRI */
 546         #endif
 547
 548         #ifndef ISR_PROTO
 549                 #define ISR_PROTO(vect) ISR(vect)
 550         #endif
 551         #ifndef DECLARE_ISR
 552                 #define DECLARE_ISR(vect) ISR(vect)
 553         #endif
 554         #ifndef DECLARE_ISR_CONTEXT_SWITCH
 555                 #define DECLARE_ISR_CONTEXT_SWITCH(vect) ISR(vect)
 556         #endif
 557         #ifndef ISR_PROTO_CONTEXT_SWITCH
 558                 #define ISR_PROTO_CONTEXT_SWITCH(vect) ISR(vect)
 559         #endif
 560
 561 #elif CPU_MSP430
 562
 563         /* Get the compiler defined macros */
 564         #include <signal.h>
 565         #define IRQ_DISABLE         dint()
 566         #define IRQ_ENABLE          eint()
 567
 568 #else
 569         #error No CPU_... defined.
 570 #endif
 571
 572 #ifdef IRQ_RUNNING
 573         /// Ensure callee is running within an interrupt
 574         #define ASSERT_IRQ_CONTEXT()  ASSERT(IRQ_RUNNING())
 575
 576         /// Ensure callee is not running within an interrupt
 577         #define ASSERT_USER_CONTEXT() ASSERT(!IRQ_RUNNING())
 578 #else
 579         #define IRQ_RUNNING()   false
 580         #define ASSERT_USER_CONTEXT()  do {} while(0)
 581         #define ASSERT_IRQ_CONTEXT()   do {} while(0)
 582 #endif
 583
 584 #ifdef IRQ_ENABLED
 585         /// Ensure interrupts are enabled
 586         #define IRQ_ASSERT_ENABLED()  ASSERT(IRQ_ENABLED())
 587
 588         /// Ensure interrupts are not enabled
 589         #define IRQ_ASSERT_DISABLED() ASSERT(!IRQ_ENABLED())
 590 #else
 591         #define IRQ_ASSERT_ENABLED() do {} while(0)
 592         #define IRQ_ASSERT_DISABLED() do {} while(0)
 593 #endif
 594
 595
 596 #ifndef IRQ_PREEMPT_HANDLER
 597         #if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
 598                 /**
 599                  * Handle preemptive context switch inside timer IRQ.
 600                  */
 601                 INLINE void IRQ_PREEMPT_HANDLER(void)
 602                 {
 603                         if (proc_needPreempt())
 604                                 proc_preempt();
 605                 }
 606         #else
 607                 #define IRQ_PREEMPT_HANDLER() /* Nothing */
 608         #endif
 609 #endif
 610
 611 /**
 612  * Execute \a CODE atomically with respect to interrupts.
 613  *
 614  * \see IRQ_SAVE_DISABLE IRQ_RESTORE
 615  */
 616 #define ATOMIC(CODE) \
 617         do { \
 618                 cpu_flags_t __flags; \
 619                 IRQ_SAVE_DISABLE(__flags); \
 620                 CODE; \
 621                 IRQ_RESTORE(__flags); \
 622         } while (0)
 623
 624 #endif /* CPU_IRQ_H */