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 void *fault_addr; 26 jmp_buf *fault_catcher; 27 struct task_struct *prev_sched; 28 struct arch_thread arch; 29 jmp_buf switch_buf; 30 struct { 31 struct { 32 int (*proc)(void *); 33 void *arg; 34 } thread; 35 } request; 36 }; 37 38 #define INIT_THREAD \ 39 { \ 40 .regs = EMPTY_REGS, \ 41 .fault_addr = NULL, \ 42 .prev_sched = NULL, \ 43 .arch = INIT_ARCH_THREAD, \ 44 .request = { } \ 45 } 46 47 /* 48 * User space process size: 3GB (default). 49 */ 50 extern unsigned long task_size; 51 52 #define TASK_SIZE (task_size) 53 54 #undef STACK_TOP 55 #undef STACK_TOP_MAX 56 57 extern unsigned long stacksizelim; 58 59 #define STACK_ROOM (stacksizelim) 60 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE) 61 #define STACK_TOP_MAX STACK_TOP 62 63 /* This decides where the kernel will search for a free chunk of vm 64 * space during mmap's. 65 */ 66 #define TASK_UNMAPPED_BASE (0x40000000) 67 68 extern void start_thread(struct pt_regs *regs, unsigned long entry, 69 unsigned long stack); 70 71 struct cpuinfo_um { 72 unsigned long loops_per_jiffy; 73 int ipi_pipe[2]; 74 int cache_alignment; 75 union { 76 __u32 x86_capability[NCAPINTS + NBUGINTS]; 77 unsigned long x86_capability_alignment; 78 }; 79 }; 80 81 extern struct cpuinfo_um boot_cpu_data; 82 83 #define cpu_data(cpu) boot_cpu_data 84 #define current_cpu_data boot_cpu_data 85 #define cache_line_size() (boot_cpu_data.cache_alignment) 86 87 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 88 extern unsigned long __get_wchan(struct task_struct *p); 89 90 #endif 91