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 *segv_regs; 24 struct task_struct *prev_sched; 25 struct arch_thread arch; 26 jmp_buf switch_buf; 27 struct { 28 struct { 29 int (*proc)(void *); 30 void *arg; 31 } thread; 32 } request; 33 34 void *segv_continue; 35 36 /* Contains variable sized FP registers */ 37 struct pt_regs regs; 38 }; 39 40 #define INIT_THREAD \ 41 { \ 42 .regs = EMPTY_REGS, \ 43 .prev_sched = NULL, \ 44 .arch = INIT_ARCH_THREAD, \ 45 .request = { } \ 46 } 47 48 /* 49 * User space process size: 3GB (default). 50 */ 51 extern unsigned long task_size; 52 53 #define TASK_SIZE (task_size) 54 55 #undef STACK_TOP 56 #undef STACK_TOP_MAX 57 58 extern unsigned long stacksizelim; 59 60 #define STACK_ROOM (stacksizelim) 61 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE) 62 #define STACK_TOP_MAX STACK_TOP 63 64 /* This decides where the kernel will search for a free chunk of vm 65 * space during mmap's. 66 */ 67 #define TASK_UNMAPPED_BASE (0x40000000) 68 69 extern void start_thread(struct pt_regs *regs, unsigned long entry, 70 unsigned long stack); 71 72 struct cpuinfo_um { 73 unsigned long loops_per_jiffy; 74 int ipi_pipe[2]; 75 int cache_alignment; 76 union { 77 __u32 x86_capability[NCAPINTS + NBUGINTS]; 78 unsigned long x86_capability_alignment; 79 }; 80 }; 81 82 extern struct cpuinfo_um boot_cpu_data; 83 84 #define cpu_data(cpu) boot_cpu_data 85 #define current_cpu_data boot_cpu_data 86 #define cache_line_size() (boot_cpu_data.cache_alignment) 87 88 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 89 extern unsigned long __get_wchan(struct task_struct *p); 90 91 #endif 92