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1 /*
2  * include/asm-h8300/processor.h
3  *
4  * Copyright (C) 2002 Yoshinori Sato
5  *
6  * Based on: linux/asm-m68nommu/processor.h
7  *
8  * Copyright (C) 1995 Hamish Macdonald
9  */
10
11 #ifndef __ASM_H8300_PROCESSOR_H
12 #define __ASM_H8300_PROCESSOR_H
13
14 /*
15  * Default implementation of macro that returns current
16  * instruction pointer ("program counter").
17  */
18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
19
20 #include <linux/compiler.h>
21 #include <asm/segment.h>
22 #include <asm/fpu.h>
23 #include <asm/ptrace.h>
24 #include <asm/current.h>
25
26 static inline unsigned long rdusp(void) {
27         extern unsigned int     sw_usp;
28         return(sw_usp);
29 }
30
31 static inline void wrusp(unsigned long usp) {
32         extern unsigned int     sw_usp;
33         sw_usp = usp;
34 }
35
36 /*
37  * User space process size: 3.75GB. This is hardcoded into a few places,
38  * so don't change it unless you know what you are doing.
39  */
40 #define TASK_SIZE       (0xFFFFFFFFUL)
41
42 #ifdef __KERNEL__
43 #define STACK_TOP       TASK_SIZE
44 #define STACK_TOP_MAX   STACK_TOP
45 #endif
46
47 /*
48  * This decides where the kernel will search for a free chunk of vm
49  * space during mmap's. We won't be using it
50  */
51 #define TASK_UNMAPPED_BASE      0
52
53 struct thread_struct {
54         unsigned long  ksp;             /* kernel stack pointer */
55         unsigned long  usp;             /* user stack pointer */
56         unsigned long  ccr;             /* saved status register */
57         unsigned long  esp0;            /* points to SR of stack frame */
58         struct {
59                 unsigned short *addr;
60                 unsigned short inst;
61         } breakinfo;
62 };
63
64 #define INIT_THREAD  {                                          \
65         .ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
66         .usp  = 0,                                              \
67         .ccr  = PS_S,                                           \
68         .esp0 = 0,                                              \
69         .breakinfo = {                                          \
70                 .addr = (unsigned short *)-1,                   \
71                 .inst = 0                                       \
72         }                                                       \
73 }
74
75 /*
76  * Do necessary setup to start up a newly executed thread.
77  *
78  * pass the data segment into user programs if it exists,
79  * it can't hurt anything as far as I can tell
80  */
81 #if defined(__H8300H__)
82 #define start_thread(_regs, _pc, _usp)                          \
83 do {                                                            \
84         set_fs(USER_DS);           /* reads from user space */  \
85         (_regs)->pc = (_pc);                                    \
86         (_regs)->ccr = 0x00;       /* clear all flags */        \
87         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
88         wrusp((unsigned long)(_usp) - sizeof(unsigned long)*3); \
89 } while(0)
90 #endif
91 #if defined(__H8300S__)
92 #define start_thread(_regs, _pc, _usp)                          \
93 do {                                                            \
94         set_fs(USER_DS);           /* reads from user space */  \
95         (_regs)->pc = (_pc);                                    \
96         (_regs)->ccr = 0x00;       /* clear kernel flag */      \
97         (_regs)->exr = 0x78;       /* enable all interrupts */  \
98         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
99         /* 14 = space for retaddr(4), vector(4), er0(4) and ext(2) on stack */ \
100         wrusp(((unsigned long)(_usp)) - 14);                    \
101 } while(0)
102 #endif
103
104 /* Forward declaration, a strange C thing */
105 struct task_struct;
106
107 /* Free all resources held by a thread. */
108 static inline void release_thread(struct task_struct *dead_task)
109 {
110 }
111
112 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
113
114 #define prepare_to_copy(tsk)    do { } while (0)
115
116 /*
117  * Free current thread data structures etc..
118  */
119 static inline void exit_thread(void)
120 {
121 }
122
123 /*
124  * Return saved PC of a blocked thread.
125  */
126 unsigned long thread_saved_pc(struct task_struct *tsk);
127 unsigned long get_wchan(struct task_struct *p);
128
129 #define KSTK_EIP(tsk)   \
130     ({                  \
131         unsigned long eip = 0;   \
132         if ((tsk)->thread.esp0 > PAGE_SIZE && \
133             MAP_NR((tsk)->thread.esp0) < max_mapnr) \
134               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
135         eip; })
136 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
137
138 #define cpu_relax()    barrier()
139
140 #endif