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 26 #define task_pt_regs(tsk) \ 27 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1) 28 29 /* Do necessary setup to start up a newly executed thread. */ 30 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp); 31 32 extern void ret_from_fork(void); 33 extern void ret_from_kernel_thread(void); 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 # define KSTK_EIP(tsk) (0) 82 # define KSTK_ESP(tsk) (0) 83 84 # else /* CONFIG_MMU */ 85 86 /* 87 * This is used to define STACK_TOP, and with MMU it must be below 88 * kernel base to select the correct PGD when handling MMU exceptions. 89 */ 90 # define TASK_SIZE (CONFIG_KERNEL_START) 91 92 /* 93 * This decides where the kernel will search for a free chunk of vm 94 * space during mmap's. 95 */ 96 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 97 98 # define THREAD_KSP 0 99 100 # ifndef __ASSEMBLY__ 101 102 /* 103 * Default implementation of macro that returns current 104 * instruction pointer ("program counter"). 105 */ 106 # define current_text_addr() ({ __label__ _l; _l: &&_l; }) 107 108 /* If you change this, you must change the associated assembly-languages 109 * constants defined below, THREAD_*. 110 */ 111 struct thread_struct { 112 /* kernel stack pointer (must be first field in structure) */ 113 unsigned long ksp; 114 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 115 void *pgdir; /* root of page-table tree */ 116 struct pt_regs *regs; /* Pointer to saved register state */ 117 }; 118 119 # define INIT_THREAD { \ 120 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 121 .pgdir = swapper_pg_dir, \ 122 } 123 124 /* Free all resources held by a thread. */ 125 static inline void release_thread(struct task_struct *dead_task) 126 { 127 } 128 129 /* Free current thread data structures etc. */ 130 static inline void exit_thread(void) 131 { 132 } 133 134 /* Return saved (kernel) PC of a blocked thread. */ 135 # define thread_saved_pc(tsk) \ 136 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0) 137 138 unsigned long get_wchan(struct task_struct *p); 139 140 /* The size allocated for kernel stacks. This _must_ be a power of two! */ 141 # define KERNEL_STACK_SIZE 0x2000 142 143 /* Return some info about the user process TASK. */ 144 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 145 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 146 147 # define task_pt_regs_plus_args(tsk) \ 148 ((void *)task_pt_regs(tsk)) 149 150 # define task_sp(task) (task_regs(task)->r1) 151 # define task_pc(task) (task_regs(task)->pc) 152 /* Grotty old names for some. */ 153 # define KSTK_EIP(task) (task_pc(task)) 154 # define KSTK_ESP(task) (task_sp(task)) 155 156 /* FIXME */ 157 # define deactivate_mm(tsk, mm) do { } while (0) 158 159 # define STACK_TOP TASK_SIZE 160 # define STACK_TOP_MAX STACK_TOP 161 162 #ifdef CONFIG_DEBUG_FS 163 extern struct dentry *of_debugfs_root; 164 #endif 165 166 # endif /* __ASSEMBLY__ */ 167 # endif /* CONFIG_MMU */ 168 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 169