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 9struct pt_regs; 10 11struct 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 20struct mm_struct; 21 22struct 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 int op; 32 union { 33 struct { 34 int pid; 35 } fork, exec; 36 struct { 37 int (*proc)(void *); 38 void *arg; 39 } thread; 40 struct { 41 void (*proc)(void *); 42 void *arg; 43 } cb; 44 } u; 45 } request; 46}; 47 48#define INIT_THREAD \ 49{ \ 50 .regs = EMPTY_REGS, \ 51 .fault_addr = NULL, \ 52 .prev_sched = NULL, \ 53 .arch = INIT_ARCH_THREAD, \ 54 .request = { 0 } \ 55} 56 57/* 58 * User space process size: 3GB (default). 59 */ 60extern unsigned long task_size; 61 62#define TASK_SIZE (task_size) 63 64#undef STACK_TOP 65#undef STACK_TOP_MAX 66 67extern unsigned long stacksizelim; 68 69#define STACK_ROOM (stacksizelim) 70#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE) 71#define STACK_TOP_MAX STACK_TOP 72 73/* This decides where the kernel will search for a free chunk of vm 74 * space during mmap's. 75 */ 76#define TASK_UNMAPPED_BASE (0x40000000) 77 78extern void start_thread(struct pt_regs *regs, unsigned long entry, 79 unsigned long stack); 80 81struct cpuinfo_um { 82 unsigned long loops_per_jiffy; 83 int ipi_pipe[2]; 84 int cache_alignment; 85 union { 86 __u32 x86_capability[NCAPINTS + NBUGINTS]; 87 unsigned long x86_capability_alignment; 88 }; 89}; 90 91extern struct cpuinfo_um boot_cpu_data; 92 93#define cpu_data(cpu) boot_cpu_data 94#define current_cpu_data boot_cpu_data 95#define cache_line_size() (boot_cpu_data.cache_alignment) 96 97extern unsigned long get_thread_reg(int reg, jmp_buf *buf); 98#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 99extern unsigned long __get_wchan(struct task_struct *p); 100 101#endif 102