arch/cris/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/asm-cris/processor.h
   4  *
   5  * Copyright (C) 2000, 2001 Axis Communications AB
   6  *
   7  * Authors:         Bjorn Wesen        Initial version
   8  *
   9  */
  10
  11 #ifndef __ASM_CRIS_PROCESSOR_H
  12 #define __ASM_CRIS_PROCESSOR_H
  13
  14 #include <asm/page.h>
  15 #include <asm/ptrace.h>
  16 #include <arch/processor.h>
  17 #include <arch/system.h>
  18
  19 struct task_struct;
  20
  21 #define STACK_TOP       TASK_SIZE
  22 #define STACK_TOP_MAX   STACK_TOP
  23
  24 /* This decides where the kernel will search for a free chunk of vm
  25  * space during mmap's.
  26  */
  27 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  28
  29 /* THREAD_SIZE is the size of the thread_info/kernel_stack combo.
  30  * normally, the stack is found by doing something like p + THREAD_SIZE
  31  * in CRIS, a page is 8192 bytes, which seems like a sane size
  32  */
  33 #define THREAD_SIZE       PAGE_SIZE
  34 #define THREAD_SIZE_ORDER (0)
  35
  36 /*
  37  * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
  38  * This macro allows us to find those regs for a task.
  39  * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
  40  * we're in the kernel, won't affect this - only the first user->kernel transition
  41  * registers are reached by this.
  42  */
  43
  44 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
  45
  46 /*
  47  * Dito but for the currently running task
  48  */
  49
  50 #define task_pt_regs(task) user_regs(task_thread_info(task))
  51
  52 unsigned long get_wchan(struct task_struct *p);
  53
  54 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
  55
  56 /* Free all resources held by a thread. */
  57 static inline void release_thread(struct task_struct *dead_task)
  58 {
  59         /* Nothing needs to be done.  */
  60 }
  61
  62 #define init_stack      (init_thread_union.stack)
  63
  64 #define cpu_relax()     barrier()
  65
  66 void default_idle(void);
  67
  68 #endif /* __ASM_CRIS_PROCESSOR_H */