1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 4 */ 5 6 #ifndef __UM_PROCESSOR_GENERIC_H 7 #define __UM_PROCESSOR_GENERIC_H 8 9 struct pt_regs; 10 11 struct task_struct; 12 13 #include <asm/ptrace.h> 14 #include <sysdep/archsetjmp.h> 15 16 #include <linux/prefetch.h> 17 18 #include <asm/cpufeatures.h> 19 20 struct mm_struct; 21 22 struct thread_struct { 23 struct pt_regs regs; 24 struct pt_regs *segv_regs; 25 int singlestep_syscall; 26 void *fault_addr; 27 jmp_buf *fault_catcher; 28 struct task_struct *prev_sched; 29 struct arch_thread arch; 30 jmp_buf switch_buf; 31 struct { 32 int op; 33 union { 34 struct { 35 int pid; 36 } fork, exec; 37 struct { 38 int (*proc)(void *); 39 void *arg; 40 } thread; 41 struct { 42 void (*proc)(void *); 43 void *arg; 44 } cb; 45 } u; 46 } request; 47 }; 48 49 #define INIT_THREAD \ 50 { \ 51 .regs = EMPTY_REGS, \ 52 .fault_addr = NULL, \ 53 .prev_sched = NULL, \ 54 .arch = INIT_ARCH_THREAD, \ 55 .request = { 0 } \ 56 } 57 58 static inline void release_thread(struct task_struct *task) 59 { 60 } 61 62 static inline void mm_copy_segments(struct mm_struct *from_mm, 63 struct mm_struct *new_mm) 64 { 65 } 66 67 /* 68 * User space process size: 3GB (default). 69 */ 70 extern unsigned long task_size; 71 72 #define TASK_SIZE (task_size) 73 74 #undef STACK_TOP 75 #undef STACK_TOP_MAX 76 77 extern unsigned long stacksizelim; 78 79 #define STACK_ROOM (stacksizelim) 80 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE) 81 #define STACK_TOP_MAX STACK_TOP 82 83 /* This decides where the kernel will search for a free chunk of vm 84 * space during mmap's. 85 */ 86 #define TASK_UNMAPPED_BASE (0x40000000) 87 88 extern void start_thread(struct pt_regs *regs, unsigned long entry, 89 unsigned long stack); 90 91 struct cpuinfo_um { 92 unsigned long loops_per_jiffy; 93 int ipi_pipe[2]; 94 int cache_alignment; 95 union { 96 __u32 x86_capability[NCAPINTS + NBUGINTS]; 97 unsigned long x86_capability_alignment; 98 }; 99 }; 100 101 extern struct cpuinfo_um boot_cpu_data; 102 103 #define cpu_data (&boot_cpu_data) 104 #define current_cpu_data boot_cpu_data 105 #define cache_line_size() (boot_cpu_data.cache_alignment) 106 107 extern unsigned long get_thread_reg(int reg, jmp_buf *buf); 108 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 109 extern unsigned long __get_wchan(struct task_struct *p); 110 111 #endif 112