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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> | |
abd03753 | 17 | #include <linux/thread_info.h> |
1da177e4 LT |
18 | #include <asm/segment.h> |
19 | #include <asm/fpu.h> | |
20 | #include <asm/ptrace.h> | |
21 | ||
22 | static inline unsigned long rdusp(void) | |
23 | { | |
24 | unsigned long usp; | |
25 | ||
26 | __asm__ __volatile__("move %/usp,%0" : "=a" (usp)); | |
27 | return usp; | |
28 | } | |
29 | ||
30 | static inline void wrusp(unsigned long usp) | |
31 | { | |
32 | __asm__ __volatile__("move %0,%/usp" : : "a" (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 | #ifndef CONFIG_SUN3 | |
40 | #define TASK_SIZE (0xF0000000UL) | |
41 | #else | |
42 | #ifdef __ASSEMBLY__ | |
43 | #define TASK_SIZE (0x0E000000) | |
44 | #else | |
45 | #define TASK_SIZE (0x0E000000UL) | |
46 | #endif | |
47 | #endif | |
48 | ||
49 | /* This decides where the kernel will search for a free chunk of vm | |
50 | * space during mmap's. | |
51 | */ | |
52 | #ifndef CONFIG_SUN3 | |
53 | #define TASK_UNMAPPED_BASE 0xC0000000UL | |
54 | #else | |
55 | #define TASK_UNMAPPED_BASE 0x0A000000UL | |
56 | #endif | |
57 | #define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr) | |
58 | ||
1da177e4 LT |
59 | struct thread_struct { |
60 | unsigned long ksp; /* kernel stack pointer */ | |
61 | unsigned long usp; /* user stack pointer */ | |
62 | unsigned short sr; /* saved status register */ | |
63 | unsigned short fs; /* saved fs (sfc, dfc) */ | |
64 | unsigned long crp[2]; /* cpu root pointer */ | |
65 | unsigned long esp0; /* points to SR of stack frame */ | |
66 | unsigned long faddr; /* info about last fault */ | |
67 | int signo, code; | |
68 | unsigned long fp[8*3]; | |
69 | unsigned long fpcntl[3]; /* fp control regs */ | |
70 | unsigned char fpstate[FPSTATESIZE]; /* floating point state */ | |
abd03753 | 71 | struct thread_info info; |
1da177e4 LT |
72 | }; |
73 | ||
74 | #define INIT_THREAD { \ | |
75 | ksp: sizeof(init_stack) + (unsigned long) init_stack, \ | |
76 | sr: PS_S, \ | |
77 | fs: __KERNEL_DS, \ | |
78 | info: INIT_THREAD_INFO(init_task) \ | |
79 | } | |
80 | ||
81 | /* | |
82 | * Do necessary setup to start up a newly executed thread. | |
83 | */ | |
84 | static inline void start_thread(struct pt_regs * regs, unsigned long pc, | |
85 | unsigned long usp) | |
86 | { | |
87 | /* reads from user space */ | |
88 | set_fs(USER_DS); | |
89 | ||
90 | regs->pc = pc; | |
91 | regs->sr &= ~0x2000; | |
92 | wrusp(usp); | |
93 | } | |
94 | ||
95 | /* Forward declaration, a strange C thing */ | |
96 | struct task_struct; | |
97 | ||
98 | /* Free all resources held by a thread. */ | |
99 | static inline void release_thread(struct task_struct *dead_task) | |
100 | { | |
101 | } | |
102 | ||
103 | /* Prepare to copy thread state - unlazy all lazy status */ | |
104 | #define prepare_to_copy(tsk) do { } while (0) | |
105 | ||
106 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
107 | ||
108 | /* | |
109 | * Free current thread data structures etc.. | |
110 | */ | |
111 | static inline void exit_thread(void) | |
112 | { | |
113 | } | |
114 | ||
115 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
116 | ||
117 | unsigned long get_wchan(struct task_struct *p); | |
118 | ||
119 | #define KSTK_EIP(tsk) \ | |
120 | ({ \ | |
121 | unsigned long eip = 0; \ | |
122 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ | |
123 | (virt_addr_valid((tsk)->thread.esp0))) \ | |
124 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ | |
125 | eip; }) | |
126 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
127 | ||
128 | #define cpu_relax() barrier() | |
129 | ||
130 | #endif |