arch/openrisc/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * OpenRISC Linux
   4  *
   5  * Linux architectural port borrowing liberally from similar works of
   6  * others.  All original copyrights apply as per the original source
   7  * declaration.
   8  *
   9  * OpenRISC implementation:
  10  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  11  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  12  * et al.
  13  */
  14
  15 #ifndef __ASM_OPENRISC_PROCESSOR_H
  16 #define __ASM_OPENRISC_PROCESSOR_H
  17
  18 #include <asm/spr_defs.h>
  19 #include <asm/page.h>
  20 #include <asm/ptrace.h>
  21
  22 #define STACK_TOP       TASK_SIZE
  23 #define STACK_TOP_MAX   STACK_TOP
  24 /* Kernel and user SR register setting */
  25 #define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
  26                    | SPR_SR_DCE | SPR_SR_SM)
  27 #define USER_SR   (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
  28                    | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
  29
  30 /*
  31  * User space process size. This is hardcoded into a few places,
  32  * so don't change it unless you know what you are doing.
  33  */
  34
  35 #define TASK_SIZE       (0x80000000UL)
  36
  37 /* This decides where the kernel will search for a free chunk of vm
  38  * space during mmap's.
  39  */
  40 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  41
  42 #ifndef __ASSEMBLY__
  43
  44 struct task_struct;
  45
  46 struct thread_struct {
  47 };
  48
  49 /*
  50  * At user->kernel entry, the pt_regs struct is stacked on the top of the
  51  * kernel-stack.  This macro allows us to find those regs for a task.
  52  * Notice that subsequent pt_regs stackings, like recursive interrupts
  53  * occurring while we're in the kernel, won't affect this - only the first
  54  * user->kernel transition registers are reached by this (i.e. not regs
  55  * for running signal handler)
  56  */
  57 #define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
  58
  59 /*
  60  * Dito but for the currently running task
  61  */
  62
  63 #define task_pt_regs(task) user_regs(task_thread_info(task))
  64
  65 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
  66
  67 #define INIT_THREAD  { }
  68
  69
  70 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
  71 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
  72
  73
  74 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
  75 void release_thread(struct task_struct *);
  76 unsigned long get_wchan(struct task_struct *p);
  77
  78 #define cpu_relax()     barrier()
  79
  80 #endif /* __ASSEMBLY__ */
  81 #endif /* __ASM_OPENRISC_PROCESSOR_H */