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1da177e4 LT |
1 | /* |
2 | * include/asm-cris/processor.h | |
3 | * | |
4 | * Copyright (C) 2000, 2001 Axis Communications AB | |
5 | * | |
6 | * Authors: Bjorn Wesen Initial version | |
7 | * | |
8 | */ | |
9 | ||
10 | #ifndef __ASM_CRIS_PROCESSOR_H | |
11 | #define __ASM_CRIS_PROCESSOR_H | |
12 | ||
1da177e4 LT |
13 | #include <asm/page.h> |
14 | #include <asm/ptrace.h> | |
556dcee7 | 15 | #include <arch/processor.h> |
b1a154db | 16 | #include <arch/system.h> |
1da177e4 | 17 | |
8c65b4a6 TS |
18 | struct task_struct; |
19 | ||
922a70d3 DH |
20 | #define STACK_TOP TASK_SIZE |
21 | #define STACK_TOP_MAX STACK_TOP | |
22 | ||
1da177e4 LT |
23 | /* This decides where the kernel will search for a free chunk of vm |
24 | * space during mmap's. | |
25 | */ | |
26 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) | |
27 | ||
28 | /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. | |
29 | * normally, the stack is found by doing something like p + THREAD_SIZE | |
30 | * in CRIS, a page is 8192 bytes, which seems like a sane size | |
31 | */ | |
32 | ||
33 | #define THREAD_SIZE PAGE_SIZE | |
34 | #define KERNEL_STACK_SIZE PAGE_SIZE | |
35 | ||
36 | /* | |
37 | * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack. | |
38 | * This macro allows us to find those regs for a task. | |
39 | * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while | |
40 | * we're in the kernel, won't affect this - only the first user->kernel transition | |
41 | * registers are reached by this. | |
42 | */ | |
43 | ||
44 | #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1) | |
45 | ||
46 | /* | |
47 | * Dito but for the currently running task | |
48 | */ | |
49 | ||
95ca0dc6 AV |
50 | #define task_pt_regs(task) user_regs(task_thread_info(task)) |
51 | #define current_regs() task_pt_regs(current) | |
1da177e4 | 52 | |
1da177e4 LT |
53 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
54 | ||
55 | unsigned long get_wchan(struct task_struct *p); | |
56 | ||
57 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
58 | ||
1da177e4 LT |
59 | extern unsigned long thread_saved_pc(struct task_struct *tsk); |
60 | ||
61 | /* Free all resources held by a thread. */ | |
d9b5444e | 62 | static inline void release_thread(struct task_struct *dead_task) |
1da177e4 LT |
63 | { |
64 | /* Nothing needs to be done. */ | |
65 | } | |
66 | ||
67 | #define init_stack (init_thread_union.stack) | |
68 | ||
69 | #define cpu_relax() barrier() | |
70 | ||
b1a154db DH |
71 | /* |
72 | * disable hlt during certain critical i/o operations | |
73 | */ | |
74 | #define HAVE_DISABLE_HLT | |
75 | void disable_hlt(void); | |
76 | void enable_hlt(void); | |
77 | ||
78 | void default_idle(void); | |
79 | ||
1da177e4 | 80 | #endif /* __ASM_CRIS_PROCESSOR_H */ |