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 <registers.h> 15 #include <sysdep/archsetjmp.h> 16 17 #include <linux/prefetch.h> 18 19 struct mm_struct; 20 21 struct thread_struct { 22 struct pt_regs regs; 23 struct pt_regs *segv_regs; 24 int singlestep_syscall; 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 static inline void release_thread(struct task_struct *task) 58 { 59 } 60 61 static inline void mm_copy_segments(struct mm_struct *from_mm, 62 struct mm_struct *new_mm) 63 { 64 } 65 66 /* 67 * User space process size: 3GB (default). 68 */ 69 extern unsigned long task_size; 70 71 #define TASK_SIZE (task_size) 72 73 #undef STACK_TOP 74 #undef STACK_TOP_MAX 75 76 extern unsigned long stacksizelim; 77 78 #define STACK_ROOM (stacksizelim) 79 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE) 80 #define STACK_TOP_MAX STACK_TOP 81 82 /* This decides where the kernel will search for a free chunk of vm 83 * space during mmap's. 84 */ 85 #define TASK_UNMAPPED_BASE (0x40000000) 86 87 extern void start_thread(struct pt_regs *regs, unsigned long entry, 88 unsigned long stack); 89 90 struct cpuinfo_um { 91 unsigned long loops_per_jiffy; 92 int ipi_pipe[2]; 93 }; 94 95 extern struct cpuinfo_um boot_cpu_data; 96 97 #define cpu_data (&boot_cpu_data) 98 #define current_cpu_data boot_cpu_data 99 100 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf) 101 extern unsigned long get_wchan(struct task_struct *p); 102 103 #endif 104