Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 13 | #include <linux/config.h> |
| 14 | #include <asm/system.h> |
| 15 | #include <asm/page.h> |
| 16 | #include <asm/ptrace.h> |
| 17 | #include <asm/arch/processor.h> |
| 18 | |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 19 | struct task_struct; |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | /* This decides where the kernel will search for a free chunk of vm |
| 22 | * space during mmap's. |
| 23 | */ |
| 24 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) |
| 25 | |
| 26 | /* THREAD_SIZE is the size of the task_struct/kernel_stack combo. |
| 27 | * normally, the stack is found by doing something like p + THREAD_SIZE |
| 28 | * in CRIS, a page is 8192 bytes, which seems like a sane size |
| 29 | */ |
| 30 | |
| 31 | #define THREAD_SIZE PAGE_SIZE |
| 32 | #define KERNEL_STACK_SIZE PAGE_SIZE |
| 33 | |
| 34 | /* |
| 35 | * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack. |
| 36 | * This macro allows us to find those regs for a task. |
| 37 | * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while |
| 38 | * we're in the kernel, won't affect this - only the first user->kernel transition |
| 39 | * registers are reached by this. |
| 40 | */ |
| 41 | |
| 42 | #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1) |
| 43 | |
| 44 | /* |
| 45 | * Dito but for the currently running task |
| 46 | */ |
| 47 | |
Al Viro | 95ca0dc | 2006-01-12 01:06:03 -0800 | [diff] [blame^] | 48 | #define task_pt_regs(task) user_regs(task_thread_info(task)) |
| 49 | #define current_regs() task_pt_regs(current) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Adrian Bunk | d9b5444 | 2005-11-07 00:58:44 -0800 | [diff] [blame] | 51 | static inline void prepare_to_copy(struct task_struct *tsk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
| 53 | } |
| 54 | |
| 55 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| 56 | |
| 57 | unsigned long get_wchan(struct task_struct *p); |
| 58 | |
| 59 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | extern unsigned long thread_saved_pc(struct task_struct *tsk); |
| 62 | |
| 63 | /* Free all resources held by a thread. */ |
Adrian Bunk | d9b5444 | 2005-11-07 00:58:44 -0800 | [diff] [blame] | 64 | static inline void release_thread(struct task_struct *dead_task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
| 66 | /* Nothing needs to be done. */ |
| 67 | } |
| 68 | |
| 69 | #define init_stack (init_thread_union.stack) |
| 70 | |
| 71 | #define cpu_relax() barrier() |
| 72 | |
| 73 | #endif /* __ASM_CRIS_PROCESSOR_H */ |