1/* 2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2008-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11#ifndef _ASM_MICROBLAZE_PROCESSOR_H 12#define _ASM_MICROBLAZE_PROCESSOR_H 13 14#include <asm/ptrace.h> 15#include <asm/setup.h> 16#include <asm/registers.h> 17#include <asm/entry.h> 18#include <asm/current.h> 19 20# ifndef __ASSEMBLY__ 21/* from kernel/cpu/mb.c */ 22extern const struct seq_operations cpuinfo_op; 23 24# define cpu_relax() barrier() 25# define cpu_sleep() do {} while (0) 26# define prepare_to_copy(tsk) do {} while (0) 27 28#define task_pt_regs(tsk) \ 29 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1) 30 31/* Do necessary setup to start up a newly executed thread. */ 32void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp); 33 34extern void ret_from_fork(void); 35 36# endif /* __ASSEMBLY__ */ 37 38# ifndef CONFIG_MMU 39/* 40 * User space process size: memory size 41 * 42 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both 43 * user processes and the kernel is on the same memory region. They 44 * both share the memory space and that is limited by the amount of 45 * physical memory. thus, we set TASK_SIZE == amount of total memory. 46 */ 47# define TASK_SIZE (0x81000000 - 0x80000000) 48 49/* 50 * Default implementation of macro that returns current 51 * instruction pointer ("program counter"). 52 */ 53# define current_text_addr() ({ __label__ _l; _l: &&_l; }) 54 55/* 56 * This decides where the kernel will search for a free chunk of vm 57 * space during mmap's. We won't be using it 58 */ 59# define TASK_UNMAPPED_BASE 0 60 61/* definition in include/linux/sched.h */ 62struct task_struct; 63 64/* thread_struct is gone. use thread_info instead. */ 65struct thread_struct { }; 66# define INIT_THREAD { } 67 68/* Free all resources held by a thread. */ 69static inline void release_thread(struct task_struct *dead_task) 70{ 71} 72 73/* Free all resources held by a thread. */ 74static inline void exit_thread(void) 75{ 76} 77 78extern unsigned long thread_saved_pc(struct task_struct *t); 79 80extern unsigned long get_wchan(struct task_struct *p); 81 82/* 83 * create a kernel thread without removing it from tasklists 84 */ 85extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 86 87# define KSTK_EIP(tsk) (0) 88# define KSTK_ESP(tsk) (0) 89 90# else /* CONFIG_MMU */ 91 92/* 93 * This is used to define STACK_TOP, and with MMU it must be below 94 * kernel base to select the correct PGD when handling MMU exceptions. 95 */ 96# define TASK_SIZE (CONFIG_KERNEL_START) 97 98/* 99 * This decides where the kernel will search for a free chunk of vm 100 * space during mmap's. 101 */ 102# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 103 104# define THREAD_KSP 0 105 106# ifndef __ASSEMBLY__ 107 108/* 109 * Default implementation of macro that returns current 110 * instruction pointer ("program counter"). 111 */ 112# define current_text_addr() ({ __label__ _l; _l: &&_l; }) 113 114/* If you change this, you must change the associated assembly-languages 115 * constants defined below, THREAD_*. 116 */ 117struct thread_struct { 118 /* kernel stack pointer (must be first field in structure) */ 119 unsigned long ksp; 120 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 121 void *pgdir; /* root of page-table tree */ 122 struct pt_regs *regs; /* Pointer to saved register state */ 123}; 124 125# define INIT_THREAD { \ 126 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 127 .pgdir = swapper_pg_dir, \ 128} 129 130/* Free all resources held by a thread. */ 131extern inline void release_thread(struct task_struct *dead_task) 132{ 133} 134 135extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 136 137/* Free current thread data structures etc. */ 138static inline void exit_thread(void) 139{ 140} 141 142/* Return saved (kernel) PC of a blocked thread. */ 143# define thread_saved_pc(tsk) \ 144 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0) 145 146unsigned long get_wchan(struct task_struct *p); 147 148/* The size allocated for kernel stacks. This _must_ be a power of two! */ 149# define KERNEL_STACK_SIZE 0x2000 150 151/* Return some info about the user process TASK. */ 152# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 153# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 154 155# define task_pt_regs_plus_args(tsk) \ 156 ((void *)task_pt_regs(tsk)) 157 158# define task_sp(task) (task_regs(task)->r1) 159# define task_pc(task) (task_regs(task)->pc) 160/* Grotty old names for some. */ 161# define KSTK_EIP(task) (task_pc(task)) 162# define KSTK_ESP(task) (task_sp(task)) 163 164/* FIXME */ 165# define deactivate_mm(tsk, mm) do { } while (0) 166 167# define STACK_TOP TASK_SIZE 168# define STACK_TOP_MAX STACK_TOP 169 170void disable_hlt(void); 171void enable_hlt(void); 172void default_idle(void); 173 174#ifdef CONFIG_DEBUG_FS 175extern struct dentry *of_debugfs_root; 176#endif 177 178# endif /* __ASSEMBLY__ */ 179# endif /* CONFIG_MMU */ 180#endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 181