arch/um/include/asm/processor-generic.h

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