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 /* 42 * Default implementation of macro that returns current 43 * instruction pointer ("program counter"). 44 */ 45 #define current_text_addr() ({ __label__ _l; _l: &&_l; }) 46 47 # define TASK_SIZE 0x7FFF0000UL 48 # define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 49 50 /* The Nios processor specific thread struct. */ 51 struct thread_struct { 52 struct pt_regs *kregs; 53 54 /* Context switch saved kernel state. */ 55 unsigned long ksp; 56 unsigned long kpsr; 57 }; 58 59 #define INIT_MMAP \ 60 { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC } 61 62 # define INIT_THREAD { \ 63 .kregs = NULL, \ 64 .ksp = 0, \ 65 .kpsr = 0, \ 66 } 67 68 extern void start_thread(struct pt_regs *regs, unsigned long pc, 69 unsigned long sp); 70 71 struct task_struct; 72 73 /* Free all resources held by a thread. */ 74 static inline void release_thread(struct task_struct *dead_task) 75 { 76 } 77 78 /* Free current thread data structures etc.. */ 79 static inline void exit_thread(void) 80 { 81 } 82 83 /* Return saved PC of a blocked thread. */ 84 #define thread_saved_pc(tsk) ((tsk)->thread.kregs->ea) 85 86 extern unsigned long get_wchan(struct task_struct *p); 87 88 #define task_pt_regs(p) \ 89 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) 90 91 /* Used by procfs */ 92 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->ea) 93 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->sp) 94 95 #define cpu_relax() barrier() 96 #define cpu_relax_lowlatency() cpu_relax() 97 98 #endif /* __ASSEMBLY__ */ 99 100 #endif /* _ASM_NIOS2_PROCESSOR_H */ 101