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 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 */ 60 extern unsigned long task_size; 61 62 #define TASK_SIZE (task_size) 63 64 #undef STACK_TOP 65 #undef STACK_TOP_MAX 66 67 extern 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 78 extern void start_thread(struct pt_regs *regs, unsigned long entry, 79 unsigned long stack); 80 81 struct 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 91 extern 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 97 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 98 extern unsigned long __get_wchan(struct task_struct *p); 99 100 #endif 101