Don't include linux/config.h from anywhere else in include/
[linux-2.6.git] / include / asm-h8300 / processor.h
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 <asm/segment.h>
21 #include <asm/fpu.h>
22 #include <asm/ptrace.h>
23 #include <asm/current.h>
24
25 static inline unsigned long rdusp(void) {
26         extern unsigned int     sw_usp;
27         return(sw_usp);
28 }
29
30 static inline void wrusp(unsigned long usp) {
31         extern unsigned int     sw_usp;
32         sw_usp = usp;
33 }
34
35 /*
36  * User space process size: 3.75GB. This is hardcoded into a few places,
37  * so don't change it unless you know what you are doing.
38  */
39 #define TASK_SIZE       (0xFFFFFFFFUL)
40
41 /*
42  * This decides where the kernel will search for a free chunk of vm
43  * space during mmap's. We won't be using it
44  */
45 #define TASK_UNMAPPED_BASE      0
46
47 struct thread_struct {
48         unsigned long  ksp;             /* kernel stack pointer */
49         unsigned long  usp;             /* user stack pointer */
50         unsigned long  ccr;             /* saved status register */
51         unsigned long  esp0;            /* points to SR of stack frame */
52         struct {
53                 unsigned short *addr;
54                 unsigned short inst;
55         } breakinfo;
56 };
57
58 #define INIT_THREAD  {                                          \
59         .ksp  = sizeof(init_stack) + (unsigned long)init_stack, \
60         .usp  = 0,                                              \
61         .ccr  = PS_S,                                           \
62         .esp0 = 0,                                              \
63         .breakinfo = {                                          \
64                 .addr = (unsigned short *)-1,                   \
65                 .inst = 0                                       \
66         }                                                       \
67 }
68
69 /*
70  * Do necessary setup to start up a newly executed thread.
71  *
72  * pass the data segment into user programs if it exists,
73  * it can't hurt anything as far as I can tell
74  */
75 #if defined(__H8300H__)
76 #define start_thread(_regs, _pc, _usp)                          \
77 do {                                                            \
78         set_fs(USER_DS);           /* reads from user space */  \
79         (_regs)->pc = (_pc);                                    \
80         (_regs)->ccr &= 0x00;      /* clear kernel flag */      \
81         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
82         wrusp((unsigned long)(_usp) - sizeof(unsigned long)*3); \
83 } while(0)
84 #endif
85 #if defined(__H8300S__)
86 #define start_thread(_regs, _pc, _usp)                          \
87 do {                                                            \
88         set_fs(USER_DS);           /* reads from user space */  \
89         (_regs)->pc = (_pc);                                    \
90         (_regs)->ccr = 0x00;       /* clear kernel flag */      \
91         (_regs)->exr = 0x78;       /* enable all interrupts */  \
92         (_regs)->er5 = current->mm->start_data; /* GOT base */  \
93         /* 14 = space for retaddr(4), vector(4), er0(4) and ext(2) on stack */ \
94         wrusp(((unsigned long)(_usp)) - 14);                    \
95 } while(0)
96 #endif
97
98 /* Forward declaration, a strange C thing */
99 struct task_struct;
100
101 /* Free all resources held by a thread. */
102 static inline void release_thread(struct task_struct *dead_task)
103 {
104 }
105
106 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
107
108 #define prepare_to_copy(tsk)    do { } while (0)
109
110 /*
111  * Free current thread data structures etc..
112  */
113 static inline void exit_thread(void)
114 {
115 }
116
117 /*
118  * Return saved PC of a blocked thread.
119  */
120 unsigned long thread_saved_pc(struct task_struct *tsk);
121 unsigned long get_wchan(struct task_struct *p);
122
123 #define KSTK_EIP(tsk)   \
124     ({                  \
125         unsigned long eip = 0;   \
126         if ((tsk)->thread.esp0 > PAGE_SIZE && \
127             MAP_NR((tsk)->thread.esp0) < max_mapnr) \
128               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
129         eip; })
130 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
131
132 #define cpu_relax()    do { } while (0)
133
134 #endif