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 extern unsigned long thread_saved_pc(struct task_struct *t); 73 74 extern unsigned long get_wchan(struct task_struct *p); 75 76 # define KSTK_EIP(tsk) (0) 77 # define KSTK_ESP(tsk) (0) 78 79 # else /* CONFIG_MMU */ 80 81 /* 82 * This is used to define STACK_TOP, and with MMU it must be below 83 * kernel base to select the correct PGD when handling MMU exceptions. 84 */ 85 # define TASK_SIZE (CONFIG_KERNEL_START) 86 87 /* 88 * This decides where the kernel will search for a free chunk of vm 89 * space during mmap's. 90 */ 91 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 92 93 # define THREAD_KSP 0 94 95 # ifndef __ASSEMBLY__ 96 97 /* 98 * Default implementation of macro that returns current 99 * instruction pointer ("program counter"). 100 */ 101 # define current_text_addr() ({ __label__ _l; _l: &&_l; }) 102 103 /* If you change this, you must change the associated assembly-languages 104 * constants defined below, THREAD_*. 105 */ 106 struct thread_struct { 107 /* kernel stack pointer (must be first field in structure) */ 108 unsigned long ksp; 109 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 110 void *pgdir; /* root of page-table tree */ 111 struct pt_regs *regs; /* Pointer to saved register state */ 112 }; 113 114 # define INIT_THREAD { \ 115 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 116 .pgdir = swapper_pg_dir, \ 117 } 118 119 /* Free all resources held by a thread. */ 120 static inline void release_thread(struct task_struct *dead_task) 121 { 122 } 123 124 /* Return saved (kernel) PC of a blocked thread. */ 125 # define thread_saved_pc(tsk) \ 126 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0) 127 128 unsigned long get_wchan(struct task_struct *p); 129 130 /* The size allocated for kernel stacks. This _must_ be a power of two! */ 131 # define KERNEL_STACK_SIZE 0x2000 132 133 /* Return some info about the user process TASK. */ 134 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 135 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 136 137 # define task_pt_regs_plus_args(tsk) \ 138 ((void *)task_pt_regs(tsk)) 139 140 # define task_sp(task) (task_regs(task)->r1) 141 # define task_pc(task) (task_regs(task)->pc) 142 /* Grotty old names for some. */ 143 # define KSTK_EIP(task) (task_pc(task)) 144 # define KSTK_ESP(task) (task_sp(task)) 145 146 /* FIXME */ 147 # define deactivate_mm(tsk, mm) do { } while (0) 148 149 # define STACK_TOP TASK_SIZE 150 # define STACK_TOP_MAX STACK_TOP 151 152 #ifdef CONFIG_DEBUG_FS 153 extern struct dentry *of_debugfs_root; 154 #endif 155 156 # endif /* __ASSEMBLY__ */ 157 # endif /* CONFIG_MMU */ 158 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 159