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