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