um/asm/processor.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __UM_PROCESSOR_H
0003 #define __UM_PROCESSOR_H
0004 #include <linux/time-internal.h>
0005
0006 /* include faultinfo structure */
0007 #include <sysdep/faultinfo.h>
0008
0009 #ifdef CONFIG_X86_32
0010 # include "processor_32.h"
0011 #else
0012 # include "processor_64.h"
0013 #endif
0014
0015 #define KSTK_EIP(tsk) KSTK_REG(tsk, HOST_IP)
0016 #define KSTK_ESP(tsk) KSTK_REG(tsk, HOST_SP)
0017 #define KSTK_EBP(tsk) KSTK_REG(tsk, HOST_BP)
0018
0019 #define ARCH_IS_STACKGROW(address) \
0020        (address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(&current->thread.regs.regs))
0021
0022 #include <asm/user.h>
0023
0024 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
0025 static __always_inline void rep_nop(void)
0026 {
0027     __asm__ __volatile__("rep;nop": : :"memory");
0028 }
0029
0030 static __always_inline void cpu_relax(void)
0031 {
0032     if (time_travel_mode == TT_MODE_INFCPU ||
0033         time_travel_mode == TT_MODE_EXTERNAL)
0034         time_travel_ndelay(1);
0035     else
0036         rep_nop();
0037 }
0038
0039 #define task_pt_regs(t) (&(t)->thread.regs)
0040
0041 #include <asm/processor-generic.h>
0042
0043 #endif