arch/h8300/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/asm-h8300/processor.h
   4  *
   5  * Copyright (C) 2002 Yoshinori Sato
   6  *
   7  * Based on: linux/asm-m68nommu/processor.h
   8  *
   9  * Copyright (C) 1995 Hamish Macdonald
  10  */
  11
  12 #ifndef __ASM_H8300_PROCESSOR_H
  13 #define __ASM_H8300_PROCESSOR_H
  14
  15 #include <linux/compiler.h>
  16 #include <asm/segment.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/current.h>
  19
  20 static inline unsigned long rdusp(void)
  21 {
  22         extern unsigned int     _sw_usp;
  23
  24         return _sw_usp;
  25 }
  26
  27 static inline void wrusp(unsigned long usp)
  28 {
  29         extern unsigned int     _sw_usp;
  30
  31         _sw_usp = usp;
  32 }
  33
  34 /*
  35  * User space process size: 3.75GB. This is hardcoded into a few places,
  36  * so don't change it unless you know what you are doing.
  37  */
  38 #define TASK_SIZE       (0xFFFFFFFFUL)
  39
  40 #ifdef __KERNEL__
  41 #define STACK_TOP       TASK_SIZE
  42 #define STACK_TOP_MAX   STACK_TOP
  43 #endif
  44
  45 /*
  46  * This decides where the kernel will search for a free chunk of vm
  47  * space during mmap's. We won't be using it
  48  */
  49 #define TASK_UNMAPPED_BASE      0
  50
  51 struct thread_struct {
  52         unsigned long  ksp;             /* kernel stack pointer */
  53         unsigned long  usp;             /* user stack pointer */
  54         unsigned long  ccr;             /* saved status register */
  55         unsigned long  esp0;            /* points to SR of stack frame */
  56         struct {
  57                 unsigned short *addr;
  58                 unsigned short inst;
  59         } breakinfo;
  60 };
  61
  62 #define INIT_THREAD  {                                          \
  63         .ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
  64         .usp  = 0,                                              \
  65         .ccr  = PS_S,                                           \
  66         .esp0 = 0,                                              \
  67         .breakinfo = {                                          \
  68                 .addr = (unsigned short *)-1,                   \
  69                 .inst = 0                                       \
  70         }                                                       \
  71 }
  72
  73 /*
  74  * Do necessary setup to start up a newly executed thread.
  75  *
  76  * pass the data segment into user programs if it exists,
  77  * it can't hurt anything as far as I can tell
  78  */
  79 #if defined(CONFIG_CPU_H8300H)
  80 #define start_thread(_regs, _pc, _usp)                          \
  81 do {                                                            \
  82         (_regs)->pc = (_pc);                                    \
  83         (_regs)->ccr = 0x00;       /* clear all flags */        \
  84         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
  85         (_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \
  86 } while (0)
  87 #endif
  88 #if defined(CONFIG_CPU_H8S)
  89 #define start_thread(_regs, _pc, _usp)                          \
  90 do {                                                            \
  91         (_regs)->pc = (_pc);                                    \
  92         (_regs)->ccr = 0x00;       /* clear kernel flag */      \
  93         (_regs)->exr = 0x78;       /* enable all interrupts */  \
  94         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
  95         /* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \
  96         (_regs)->sp = ((unsigned long)(_usp)) - 14;             \
  97 } while (0)
  98 #endif
  99
 100 /* Forward declaration, a strange C thing */
 101 struct task_struct;
 102
 103 /* Free all resources held by a thread. */
 104 static inline void release_thread(struct task_struct *dead_task)
 105 {
 106 }
 107
 108 unsigned long get_wchan(struct task_struct *p);
 109
 110 #define KSTK_EIP(tsk)   \
 111         ({                       \
 112                 unsigned long eip = 0;        \
 113                 if ((tsk)->thread.esp0 > PAGE_SIZE &&   \
 114                     MAP_NR((tsk)->thread.esp0) < max_mapnr)      \
 115                         eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
 116                 eip; })
 117
 118 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 119
 120 #define cpu_relax()    barrier()
 121
 122 #define HARD_RESET_NOW() ({             \
 123         local_irq_disable();            \
 124         asm("jmp @@0");                 \
 125 })
 126
 127 #endif