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