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7#ifndef __ASM_M68K_PROCESSOR_H
8#define __ASM_M68K_PROCESSOR_H
9
10
11
12
13
14#define current_text_addr() ({ __label__ _l; _l: &&_l;})
15
16#include <linux/thread_info.h>
17#include <asm/segment.h>
18#include <asm/fpu.h>
19#include <asm/ptrace.h>
20
21static inline unsigned long rdusp(void)
22{
23#ifdef CONFIG_COLDFIRE_SW_A7
24 extern unsigned int sw_usp;
25 return sw_usp;
26#else
27 register unsigned long usp __asm__("a0");
28
29 __asm__ __volatile__(".word 0x4e68" : "=a" (usp));
30 return usp;
31#endif
32}
33
34static inline void wrusp(unsigned long usp)
35{
36#ifdef CONFIG_COLDFIRE_SW_A7
37 extern unsigned int sw_usp;
38 sw_usp = usp;
39#else
40 register unsigned long a0 __asm__("a0") = usp;
41
42 __asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
43#endif
44}
45
46
47
48
49
50#ifdef CONFIG_MMU
51#if defined(CONFIG_COLDFIRE)
52#define TASK_SIZE (0xC0000000UL)
53#elif defined(CONFIG_SUN3)
54#define TASK_SIZE (0x0E000000UL)
55#else
56#define TASK_SIZE (0xF0000000UL)
57#endif
58#else
59#define TASK_SIZE (0xFFFFFFFFUL)
60#endif
61
62#ifdef __KERNEL__
63#define STACK_TOP TASK_SIZE
64#define STACK_TOP_MAX STACK_TOP
65#endif
66
67
68
69
70#ifdef CONFIG_MMU
71#if defined(CONFIG_COLDFIRE)
72#define TASK_UNMAPPED_BASE 0x60000000UL
73#elif defined(CONFIG_SUN3)
74#define TASK_UNMAPPED_BASE 0x0A000000UL
75#else
76#define TASK_UNMAPPED_BASE 0xC0000000UL
77#endif
78#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
79#else
80#define TASK_UNMAPPED_BASE 0
81#endif
82
83struct thread_struct {
84 unsigned long ksp;
85 unsigned long usp;
86 unsigned short sr;
87 unsigned short fs;
88 unsigned long crp[2];
89 unsigned long esp0;
90 unsigned long faddr;
91 int signo, code;
92 unsigned long fp[8*3];
93 unsigned long fpcntl[3];
94 unsigned char fpstate[FPSTATESIZE];
95};
96
97#define INIT_THREAD { \
98 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
99 .sr = PS_S, \
100 .fs = __KERNEL_DS, \
101}
102
103
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105
106
107#ifdef CONFIG_COLDFIRE
108#define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0)
109#else
110#define setframeformat(_regs) do { } while (0)
111#endif
112
113
114
115
116static inline void start_thread(struct pt_regs * regs, unsigned long pc,
117 unsigned long usp)
118{
119 regs->pc = pc;
120 regs->sr &= ~0x2000;
121 setframeformat(regs);
122 wrusp(usp);
123}
124
125#ifdef CONFIG_MMU
126extern int handle_kernel_fault(struct pt_regs *regs);
127#else
128static inline int handle_kernel_fault(struct pt_regs *regs)
129{
130
131 return 0;
132}
133#endif
134
135
136struct task_struct;
137
138
139static inline void release_thread(struct task_struct *dead_task)
140{
141}
142
143extern unsigned long thread_saved_pc(struct task_struct *tsk);
144
145unsigned long get_wchan(struct task_struct *p);
146
147#define KSTK_EIP(tsk) \
148 ({ \
149 unsigned long eip = 0; \
150 if ((tsk)->thread.esp0 > PAGE_SIZE && \
151 (virt_addr_valid((tsk)->thread.esp0))) \
152 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
153 eip; })
154#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
155
156#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0))
157
158#define cpu_relax() barrier()
159#define cpu_relax_lowlatency() cpu_relax()
160
161#endif
162