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         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 extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
  98 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
  99 extern unsigned long __get_wchan(struct task_struct *p);
 100
 101 #endif