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 */
  19 extern 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. */
  27 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  28
  29 extern void ret_from_fork(void);
  30 extern 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  */
  53 struct 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. */
  67 static inline void release_thread(struct task_struct *dead_task)
  68 {
  69 }
  70
  71 unsigned 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
  93 extern struct dentry *of_debugfs_root;
  94 #endif
  95
  96 #  endif /* __ASSEMBLY__ */
  97 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */