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 /* 35 * This is used to define STACK_TOP, and with MMU it must be below 36 * kernel base to select the correct PGD when handling MMU exceptions. 37 */ 38 # define TASK_SIZE (CONFIG_KERNEL_START) 39 40 /* 41 * This decides where the kernel will search for a free chunk of vm 42 * space during mmap's. 43 */ 44 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 45 46 # define THREAD_KSP 0 47 48 # ifndef __ASSEMBLY__ 49 50 /* If you change this, you must change the associated assembly-languages 51 * constants defined below, THREAD_*. 52 */ 53 struct thread_struct { 54 /* kernel stack pointer (must be first field in structure) */ 55 unsigned long ksp; 56 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 57 void *pgdir; /* root of page-table tree */ 58 struct pt_regs *regs; /* Pointer to saved register state */ 59 }; 60 61 # define INIT_THREAD { \ 62 .ksp = sizeof init_stack + (unsigned long)init_stack, \ 63 .pgdir = swapper_pg_dir, \ 64 } 65 66 unsigned long __get_wchan(struct task_struct *p); 67 68 /* The size allocated for kernel stacks. This _must_ be a power of two! */ 69 # define KERNEL_STACK_SIZE 0x2000 70 71 /* Return some info about the user process TASK. */ 72 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE) 73 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1) 74 75 # define task_pt_regs_plus_args(tsk) \ 76 ((void *)task_pt_regs(tsk)) 77 78 # define task_sp(task) (task_regs(task)->r1) 79 # define task_pc(task) (task_regs(task)->pc) 80 /* Grotty old names for some. */ 81 # define KSTK_EIP(task) (task_pc(task)) 82 # define KSTK_ESP(task) (task_sp(task)) 83 84 # define STACK_TOP TASK_SIZE 85 # define STACK_TOP_MAX STACK_TOP 86 87 #ifdef CONFIG_DEBUG_FS 88 extern struct dentry *of_debugfs_root; 89 #endif 90 91 # endif /* __ASSEMBLY__ */ 92 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ 93