1 /* 2 * Copyright (C) 2008-2009 Michal Simek <[email protected]> 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_relax_yield() cpu_relax() 26 # define cpu_relax_lowlatency() cpu_relax() 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 extern void ret_from_fork(void); 35 extern void ret_from_kernel_thread(void); 36 37 # endif /* __ASSEMBLY__ */ 38 39 # ifndef CONFIG_MMU 40 /* 41 * User space process size: memory size 42 * 43 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both 44 * user processes and the kernel is on the same memory region. They 45 * both share the memory space and that is limited by the amount of 46 * physical memory. thus, we set TASK_SIZE == amount of total memory. 47 */ 48 # define TASK_SIZE (0x81000000 - 0x80000000) 49 50 /* 51 * Default implementation of macro that returns current 52 * instruction pointer ("program counter"). 53 */ 54 # define current_text_addr() ({ __label__ _l; _l: &&_l; }) 55 56 /* 57 * This decides where the kernel will search for a free chunk of vm 58 * space during mmap's. We won't be using it 59 */ 60 # define TASK_UNMAPPED_BASE 0 61 62 /* definition in include/linux/sched.h */ 63 struct task_struct; 64 65 /* thread_struct is gone. use thread_info instead. */ 66 struct thread_struct { }; 67 # define INIT_THREAD { } 68 69 /* Free all resources held by a thread. */ 70 static inline void release_thread(struct task_struct *dead_task) 71 { 72 } 73 74 extern unsigned long thread_saved_pc(struct task_struct *t); 75 76 extern unsigned long get_wchan(struct task_struct *p); 77 78 # define KSTK_EIP(tsk) (0) 79 # define KSTK_ESP(tsk) (0) 80 81 # else /* CONFIG_MMU */ 82 83 /* 84 * This is used to define STACK_TOP, and with MMU it must be below 85 * kernel base to select the correct PGD when handling MMU exceptions. 86 */ 87 # define TASK_SIZE (CONFIG_KERNEL_START) 88 89 /* 90 * This decides where the kernel will search for a free chunk of vm 91 * space during mmap's. 92 */ 93 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 94 95 # define THREAD_KSP 0 96 97 # ifndef __ASSEMBLY__ 98 99 /* 100 * Default implementation of macro that returns current 101 * instruction pointer ("program counter"). 102 */ 103 # define current_text_addr() ({ __label__ _l; _l: &&_l; }) 104 105 /* If you change this, you must change the associated assembly-languages 106 * constants defined below, THREAD_*. 107 */ 108 struct thread_struct { 109 /* kernel stack pointer (must be first field in structure) */ 110 unsigned long ksp; 111 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 112 void *pgdir; /* root of page-table tree */ 113 struct pt_regs *regs; /* Pointer to saved register state */ 114 }; 115 116 # define INIT_THREAD { \ 117 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 118 .pgdir = swapper_pg_dir, \ 119 } 120 121 /* Free all resources held by a thread. */ 122 static inline void release_thread(struct task_struct *dead_task) 123 { 124 } 125 126 /* Return saved (kernel) PC of a blocked thread. */ 127 # define thread_saved_pc(tsk) \ 128 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0) 129 130 unsigned long get_wchan(struct task_struct *p); 131 132 /* The size allocated for kernel stacks. This _must_ be a power of two! */ 133 # define KERNEL_STACK_SIZE 0x2000 134 135 /* Return some info about the user process TASK. */ 136 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 137 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 138 139 # define task_pt_regs_plus_args(tsk) \ 140 ((void *)task_pt_regs(tsk)) 141 142 # define task_sp(task) (task_regs(task)->r1) 143 # define task_pc(task) (task_regs(task)->pc) 144 /* Grotty old names for some. */ 145 # define KSTK_EIP(task) (task_pc(task)) 146 # define KSTK_ESP(task) (task_sp(task)) 147 148 /* FIXME */ 149 # define deactivate_mm(tsk, mm) do { } while (0) 150 151 # define STACK_TOP TASK_SIZE 152 # define STACK_TOP_MAX STACK_TOP 153 154 #ifdef CONFIG_DEBUG_FS 155 extern struct dentry *of_debugfs_root; 156 #endif 157 158 # endif /* __ASSEMBLY__ */ 159 # endif /* CONFIG_MMU */ 160 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 161