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1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/asm-cris/processor.h
5 * Copyright (C) 2000, 2001 Axis Communications AB
7 * Authors: Bjorn Wesen Initial version
11 #ifndef __ASM_CRIS_PROCESSOR_H
12 #define __ASM_CRIS_PROCESSOR_H
15 #include <asm/ptrace.h>
16 #include <arch/processor.h>
17 #include <arch/system.h>
21 #define STACK_TOP TASK_SIZE
22 #define STACK_TOP_MAX STACK_TOP
24 /* This decides where the kernel will search for a free chunk of vm
25 * space during mmap's.
27 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
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
33 #define THREAD_SIZE PAGE_SIZE
34 #define THREAD_SIZE_ORDER (0)
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.
44 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
47 * Dito but for the currently running task
50 #define task_pt_regs(task) user_regs(task_thread_info(task))
52 unsigned long get_wchan(struct task_struct
*p
);
54 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
56 /* Free all resources held by a thread. */
57 static inline void release_thread(struct task_struct
*dead_task
)
59 /* Nothing needs to be done. */
62 #define init_stack (init_thread_union.stack)
64 #define cpu_relax() barrier()
66 void default_idle(void);
68 #endif /* __ASM_CRIS_PROCESSOR_H */