arch/x86/um/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __UM_PROCESSOR_H
   3 #define __UM_PROCESSOR_H
   4 #include <linux/time-internal.h>
   5
   6 /* include faultinfo structure */
   7 #include <sysdep/faultinfo.h>
   8
   9 #ifdef CONFIG_X86_32
  10 # include "processor_32.h"
  11 #else
  12 # include "processor_64.h"
  13 #endif
  14
  15 #define KSTK_EIP(tsk) KSTK_REG(tsk, HOST_IP)
  16 #define KSTK_ESP(tsk) KSTK_REG(tsk, HOST_SP)
  17 #define KSTK_EBP(tsk) KSTK_REG(tsk, HOST_BP)
  18
  19 #define ARCH_IS_STACKGROW(address) \
  20        (address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(&current->thread.regs.regs))
  21
  22 #include <asm/user.h>
  23
  24 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
  25 static __always_inline void rep_nop(void)
  26 {
  27         __asm__ __volatile__("rep;nop": : :"memory");
  28 }
  29
  30 static __always_inline void cpu_relax(void)
  31 {
  32         if (time_travel_mode == TT_MODE_INFCPU ||
  33             time_travel_mode == TT_MODE_EXTERNAL)
  34                 time_travel_ndelay(1);
  35         else
  36                 rep_nop();
  37 }
  38
  39 #define task_pt_regs(t) (&(t)->thread.regs)
  40
  41 #include <asm/processor-generic.h>
  42
  43 #endif