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TOMOYO Linux Cross Reference
Linux/arch/openrisc/include/asm/processor.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * OpenRISC Linux
  4  *
  5  * Linux architectural port borrowing liberally from similar works of
  6  * others.  All original copyrights apply as per the original source
  7  * declaration.
  8  *
  9  * OpenRISC implementation:
 10  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 11  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 12  * et al.
 13  */
 14 
 15 #ifndef __ASM_OPENRISC_PROCESSOR_H
 16 #define __ASM_OPENRISC_PROCESSOR_H
 17 
 18 #include <asm/spr_defs.h>
 19 #include <asm/page.h>
 20 #include <asm/ptrace.h>
 21 
 22 #define STACK_TOP       TASK_SIZE
 23 #define STACK_TOP_MAX   STACK_TOP
 24 /* Kernel and user SR register setting */
 25 #define KERNEL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
 26                    | SPR_SR_DCE | SPR_SR_SM)
 27 #define USER_SR   (SPR_SR_DME | SPR_SR_IME | SPR_SR_ICE \
 28                    | SPR_SR_DCE | SPR_SR_IEE | SPR_SR_TEE)
 29 
 30 /*
 31  * User space process size. This is hardcoded into a few places,
 32  * so don't change it unless you know what you are doing.
 33  */
 34 
 35 #define TASK_SIZE       (0x80000000UL)
 36 
 37 /* This decides where the kernel will search for a free chunk of vm
 38  * space during mmap's.
 39  */
 40 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 41 
 42 #ifndef __ASSEMBLY__
 43 
 44 struct task_struct;
 45 
 46 struct thread_struct {
 47 };
 48 
 49 /*
 50  * At user->kernel entry, the pt_regs struct is stacked on the top of the
 51  * kernel-stack.  This macro allows us to find those regs for a task.
 52  * Notice that subsequent pt_regs stackings, like recursive interrupts
 53  * occurring while we're in the kernel, won't affect this - only the first
 54  * user->kernel transition registers are reached by this (i.e. not regs
 55  * for running signal handler)
 56  */
 57 #define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)
 58 
 59 /*
 60  * Dito but for the currently running task
 61  */
 62 
 63 #define task_pt_regs(task) user_regs(task_thread_info(task))
 64 
 65 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 66 
 67 #define INIT_THREAD  { }
 68 
 69 
 70 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
 71 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
 72 
 73 
 74 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
 75 void release_thread(struct task_struct *);
 76 unsigned long get_wchan(struct task_struct *p);
 77 
 78 #define cpu_relax()     barrier()
 79 
 80 #endif /* __ASSEMBLY__ */
 81 #endif /* __ASM_OPENRISC_PROCESSOR_H */
 82 

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