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1da177e4 LT |
1 | /* |
2 | * include/asm-m68k/processor.h | |
3 | * | |
4 | * Copyright (C) 1995 Hamish Macdonald | |
5 | */ | |
6 | ||
7 | #ifndef __ASM_M68K_PROCESSOR_H | |
8 | #define __ASM_M68K_PROCESSOR_H | |
9 | ||
10 | /* | |
11 | * Default implementation of macro that returns current | |
12 | * instruction pointer ("program counter"). | |
13 | */ | |
14 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
15 | ||
16 | #include <linux/config.h> | |
17 | #include <linux/threads.h> | |
18 | #include <asm/types.h> | |
19 | #include <asm/segment.h> | |
20 | #include <asm/fpu.h> | |
21 | #include <asm/ptrace.h> | |
22 | #include <asm/current.h> | |
23 | ||
24 | extern inline unsigned long rdusp(void) | |
25 | { | |
26 | #ifdef CONFIG_COLDFIRE | |
27 | extern unsigned int sw_usp; | |
28 | return(sw_usp); | |
29 | #else | |
30 | unsigned long usp; | |
31 | __asm__ __volatile__("move %/usp,%0" : "=a" (usp)); | |
32 | return usp; | |
33 | #endif | |
34 | } | |
35 | ||
36 | extern inline void wrusp(unsigned long usp) | |
37 | { | |
38 | #ifdef CONFIG_COLDFIRE | |
39 | extern unsigned int sw_usp; | |
40 | sw_usp = usp; | |
41 | #else | |
42 | __asm__ __volatile__("move %0,%/usp" : : "a" (usp)); | |
43 | #endif | |
44 | } | |
45 | ||
46 | /* | |
47 | * User space process size: 3.75GB. This is hardcoded into a few places, | |
48 | * so don't change it unless you know what you are doing. | |
49 | */ | |
50 | #define TASK_SIZE (0xF0000000UL) | |
51 | ||
52 | /* | |
53 | * This decides where the kernel will search for a free chunk of vm | |
54 | * space during mmap's. We won't be using it | |
55 | */ | |
56 | #define TASK_UNMAPPED_BASE 0 | |
57 | ||
58 | /* | |
59 | * if you change this structure, you must change the code and offsets | |
60 | * in m68k/machasm.S | |
61 | */ | |
62 | ||
63 | struct thread_struct { | |
64 | unsigned long ksp; /* kernel stack pointer */ | |
65 | unsigned long usp; /* user stack pointer */ | |
66 | unsigned short sr; /* saved status register */ | |
67 | unsigned short fs; /* saved fs (sfc, dfc) */ | |
68 | unsigned long crp[2]; /* cpu root pointer */ | |
69 | unsigned long esp0; /* points to SR of stack frame */ | |
70 | unsigned long fp[8*3]; | |
71 | unsigned long fpcntl[3]; /* fp control regs */ | |
72 | unsigned char fpstate[FPSTATESIZE]; /* floating point state */ | |
73 | }; | |
74 | ||
75 | #define INIT_THREAD { \ | |
76 | sizeof(init_stack) + (unsigned long) init_stack, 0, \ | |
77 | PS_S, __KERNEL_DS, \ | |
78 | {0, 0}, 0, {0,}, {0, 0, 0}, {0,}, \ | |
79 | } | |
80 | ||
81 | /* | |
82 | * Do necessary setup to start up a newly executed thread. | |
83 | * | |
84 | * pass the data segment into user programs if it exists, | |
85 | * it can't hurt anything as far as I can tell | |
86 | */ | |
87 | #define start_thread(_regs, _pc, _usp) \ | |
88 | do { \ | |
89 | set_fs(USER_DS); /* reads from user space */ \ | |
90 | (_regs)->pc = (_pc); \ | |
91 | if (current->mm) \ | |
92 | (_regs)->d5 = current->mm->start_data; \ | |
93 | (_regs)->sr &= ~0x2000; \ | |
94 | wrusp(_usp); \ | |
95 | } while(0) | |
96 | ||
97 | /* Forward declaration, a strange C thing */ | |
98 | struct task_struct; | |
99 | ||
100 | /* Free all resources held by a thread. */ | |
101 | static inline void release_thread(struct task_struct *dead_task) | |
102 | { | |
103 | } | |
104 | ||
105 | /* Prepare to copy thread state - unlazy all lazy status */ | |
106 | #define prepare_to_copy(tsk) do { } while (0) | |
107 | ||
108 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
109 | ||
110 | /* | |
111 | * Free current thread data structures etc.. | |
112 | */ | |
113 | static inline void exit_thread(void) | |
114 | { | |
115 | } | |
116 | ||
117 | unsigned long thread_saved_pc(struct task_struct *tsk); | |
118 | unsigned long get_wchan(struct task_struct *p); | |
119 | ||
120 | #define KSTK_EIP(tsk) \ | |
121 | ({ \ | |
122 | unsigned long eip = 0; \ | |
123 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ | |
124 | (virt_addr_valid((tsk)->thread.esp0))) \ | |
125 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ | |
126 | eip; }) | |
127 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
128 | ||
129 | #define cpu_relax() do { } while (0) | |
130 | ||
131 | #endif |