1 /* 2 * Copyright (C) 2013 Altera Corporation 3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> 4 * Copyright (C) 2004 Microtronix Datacom Ltd 5 * Copyright (C) 2001 Ken Hill (khill@microtronix.com) 6 * Vic Phillips (vic@microtronix.com) 7 * 8 * based on SPARC asm/processor_32.h which is: 9 * 10 * Copyright (C) 1994 David S. Miller 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file "COPYING" in the main directory of this archive 14 * for more details. 15 */ 16 17 #ifndef _ASM_NIOS2_PROCESSOR_H 18 #define _ASM_NIOS2_PROCESSOR_H 19 20 #include <asm/ptrace.h> 21 #include <asm/registers.h> 22 #include <asm/page.h> 23 24 #define NIOS2_FLAG_KTHREAD 0x00000001 /* task is a kernel thread */ 25 26 #define NIOS2_OP_NOP 0x1883a 27 #define NIOS2_OP_BREAK 0x3da03a 28 29 #ifdef __KERNEL__ 30 31 #define STACK_TOP TASK_SIZE 32 #define STACK_TOP_MAX STACK_TOP 33 34 #endif /* __KERNEL__ */ 35 36 /* Kuser helpers is mapped to this user space address */ 37 #define KUSER_BASE 0x1000 38 #define KUSER_SIZE (PAGE_SIZE) 39 #ifndef __ASSEMBLY__ 40 41 # define TASK_SIZE 0x7FFF0000UL 42 # define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 43 44 /* The Nios processor specific thread struct. */ 45 struct thread_struct { 46 struct pt_regs *kregs; 47 48 /* Context switch saved kernel state. */ 49 unsigned long ksp; 50 unsigned long kpsr; 51 }; 52 53 #define INIT_MMAP \ 54 { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC } 55 56 # define INIT_THREAD { \ 57 .kregs = NULL, \ 58 .ksp = 0, \ 59 .kpsr = 0, \ 60 } 61 62 extern void start_thread(struct pt_regs *regs, unsigned long pc, 63 unsigned long sp); 64 65 struct task_struct; 66 67 extern unsigned long __get_wchan(struct task_struct *p); 68 69 #define task_pt_regs(p) \ 70 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) 71 72 /* Used by procfs */ 73 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->ea) 74 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->sp) 75 76 #define cpu_relax() barrier() 77 78 #endif /* __ASSEMBLY__ */ 79 80 #endif /* _ASM_NIOS2_PROCESSOR_H */ 81