1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 4 * Copyright (C) 2008-2009 PetaLogix 5 * Copyright (C) 2006 Atmark Techno, Inc. 6 */ 7 8 #ifndef _ASM_MICROBLAZE_PROCESSOR_H 9 #define _ASM_MICROBLAZE_PROCESSOR_H 10 11 #include <asm/ptrace.h> 12 #include <asm/setup.h> 13 #include <asm/registers.h> 14 #include <asm/entry.h> 15 #include <asm/current.h> 16 17 # ifndef __ASSEMBLY__ 18 /* from kernel/cpu/mb.c */ 19 extern const struct seq_operations cpuinfo_op; 20 21 # define cpu_relax() barrier() 22 23 #define task_pt_regs(tsk) \ 24 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1) 25 26 /* Do necessary setup to start up a newly executed thread. */ 27 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp); 28 29 extern void ret_from_fork(void); 30 extern void ret_from_kernel_thread(void); 31 32 # endif /* __ASSEMBLY__ */ 33 34 # ifndef CONFIG_MMU 35 /* 36 * User space process size: memory size 37 * 38 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both 39 * user processes and the kernel is on the same memory region. They 40 * both share the memory space and that is limited by the amount of 41 * physical memory. thus, we set TASK_SIZE == amount of total memory. 42 */ 43 # define TASK_SIZE (0x81000000 - 0x80000000) 44 45 /* 46 * This decides where the kernel will search for a free chunk of vm 47 * space during mmap's. We won't be using it 48 */ 49 # define TASK_UNMAPPED_BASE 0 50 51 /* definition in include/linux/sched.h */ 52 struct task_struct; 53 54 /* thread_struct is gone. use thread_info instead. */ 55 struct thread_struct { }; 56 # define INIT_THREAD { } 57 58 /* Free all resources held by a thread. */ 59 static inline void release_thread(struct task_struct *dead_task) 60 { 61 } 62 63 extern unsigned long get_wchan(struct task_struct *p); 64 65 # define KSTK_EIP(tsk) (0) 66 # define KSTK_ESP(tsk) (0) 67 68 # else /* CONFIG_MMU */ 69 70 /* 71 * This is used to define STACK_TOP, and with MMU it must be below 72 * kernel base to select the correct PGD when handling MMU exceptions. 73 */ 74 # define TASK_SIZE (CONFIG_KERNEL_START) 75 76 /* 77 * This decides where the kernel will search for a free chunk of vm 78 * space during mmap's. 79 */ 80 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 81 82 # define THREAD_KSP 0 83 84 # ifndef __ASSEMBLY__ 85 86 /* If you change this, you must change the associated assembly-languages 87 * constants defined below, THREAD_*. 88 */ 89 struct thread_struct { 90 /* kernel stack pointer (must be first field in structure) */ 91 unsigned long ksp; 92 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 93 void *pgdir; /* root of page-table tree */ 94 struct pt_regs *regs; /* Pointer to saved register state */ 95 }; 96 97 # define INIT_THREAD { \ 98 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 99 .pgdir = swapper_pg_dir, \ 100 } 101 102 /* Free all resources held by a thread. */ 103 static inline void release_thread(struct task_struct *dead_task) 104 { 105 } 106 107 unsigned long get_wchan(struct task_struct *p); 108 109 /* The size allocated for kernel stacks. This _must_ be a power of two! */ 110 # define KERNEL_STACK_SIZE 0x2000 111 112 /* Return some info about the user process TASK. */ 113 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 114 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 115 116 # define task_pt_regs_plus_args(tsk) \ 117 ((void *)task_pt_regs(tsk)) 118 119 # define task_sp(task) (task_regs(task)->r1) 120 # define task_pc(task) (task_regs(task)->pc) 121 /* Grotty old names for some. */ 122 # define KSTK_EIP(task) (task_pc(task)) 123 # define KSTK_ESP(task) (task_sp(task)) 124 125 /* FIXME */ 126 # define deactivate_mm(tsk, mm) do { } while (0) 127 128 # define STACK_TOP TASK_SIZE 129 # define STACK_TOP_MAX STACK_TOP 130 131 #ifdef CONFIG_DEBUG_FS 132 extern struct dentry *of_debugfs_root; 133 #endif 134 135 # endif /* __ASSEMBLY__ */ 136 # endif /* CONFIG_MMU */ 137 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 138