1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * include/asm-cris/processor.h
4 *
5 * Copyright (C) 2000, 2001 Axis Communications AB
6 *
7 * Authors: Bjorn Wesen Initial version
8 *
9 */
10
11 #ifndef __ASM_CRIS_PROCESSOR_H
12 #define __ASM_CRIS_PROCESSOR_H
13
14 #include <asm/page.h>
15 #include <asm/ptrace.h>
16 #include <arch/processor.h>
17 #include <arch/system.h>
18
19 struct task_struct;
20
21 #define STACK_TOP TASK_SIZE
22 #define STACK_TOP_MAX STACK_TOP
23
24 /* This decides where the kernel will search for a free chunk of vm
25 * space during mmap's.
26 */
27 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
28
29 /* THREAD_SIZE is the size of the thread_info/kernel_stack combo.
30 * normally, the stack is found by doing something like p + THREAD_SIZE
31 * in CRIS, a page is 8192 bytes, which seems like a sane size
32 */
33 #define THREAD_SIZE PAGE_SIZE
34 #define THREAD_SIZE_ORDER (0)
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
50 #define task_pt_regs(task) user_regs(task_thread_info(task))
51
52 unsigned long get_wchan(struct task_struct *p);
53
54 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
55
56 /* Free all resources held by a thread. */
57 static inline void release_thread(struct task_struct *dead_task)
58 {
59 /* Nothing needs to be done. */
60 }
61
62 #define init_stack (init_thread_union.stack)
63
64 #define cpu_relax() barrier()
65
66 void default_idle(void);
67
68 #endif /* __ASM_CRIS_PROCESSOR_H */
69
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