LXR linux/arch/microblaze/include/asm/processor.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   4 * Copyright (C) 2008-2009 PetaLogix
   5 * Copyright (C) 2006 Atmark Techno, Inc.
   6 */
   7
   8#ifndef _ASM_MICROBLAZE_PROCESSOR_H
   9#define _ASM_MICROBLAZE_PROCESSOR_H
  10
  11#include <asm/ptrace.h>
  12#include <asm/setup.h>
  13#include <asm/registers.h>
  14#include <asm/entry.h>
  15#include <asm/current.h>
  16
  17# ifndef __ASSEMBLY__
  18/* from kernel/cpu/mb.c */
  19extern const struct seq_operations cpuinfo_op;
  20
  21# define cpu_relax()            barrier()
  22
  23#define task_pt_regs(tsk) \
  24                (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  25
  26/* Do necessary setup to start up a newly executed thread. */
  27void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  28
  29extern void ret_from_fork(void);
  30extern void ret_from_kernel_thread(void);
  31
  32# endif /* __ASSEMBLY__ */
  33
  34/*
  35 * This is used to define STACK_TOP, and with MMU it must be below
  36 * kernel base to select the correct PGD when handling MMU exceptions.
  37 */
  38# define TASK_SIZE      (CONFIG_KERNEL_START)
  39
  40/*
  41 * This decides where the kernel will search for a free chunk of vm
  42 * space during mmap's.
  43 */
  44# define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
  45
  46# define THREAD_KSP     0
  47
  48#  ifndef __ASSEMBLY__
  49
  50/* If you change this, you must change the associated assembly-languages
  51 * constants defined below, THREAD_*.
  52 */
  53struct thread_struct {
  54        /* kernel stack pointer (must be first field in structure) */
  55        unsigned long   ksp;
  56        unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
  57        void            *pgdir;         /* root of page-table tree */
  58        struct pt_regs  *regs;          /* Pointer to saved register state */
  59};
  60
  61#  define INIT_THREAD { \
  62        .ksp   = sizeof init_stack + (unsigned long)init_stack, \
  63        .pgdir = swapper_pg_dir, \
  64}
  65
  66/* Free all resources held by a thread. */
  67static inline void release_thread(struct task_struct *dead_task)
  68{
  69}
  70
  71unsigned long get_wchan(struct task_struct *p);
  72
  73/* The size allocated for kernel stacks. This _must_ be a power of two! */
  74# define KERNEL_STACK_SIZE      0x2000
  75
  76/* Return some info about the user process TASK.  */
  77#  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
  78#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
  79
  80#  define task_pt_regs_plus_args(tsk) \
  81        ((void *)task_pt_regs(tsk))
  82
  83#  define task_sp(task) (task_regs(task)->r1)
  84#  define task_pc(task) (task_regs(task)->pc)
  85/* Grotty old names for some.  */
  86#  define KSTK_EIP(task)        (task_pc(task))
  87#  define KSTK_ESP(task)        (task_sp(task))
  88
  89#  define STACK_TOP     TASK_SIZE
  90#  define STACK_TOP_MAX STACK_TOP
  91
  92#ifdef CONFIG_DEBUG_FS
  93extern struct dentry *of_debugfs_root;
  94#endif
  95
  96#  endif /* __ASSEMBLY__ */
  97#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
  98