forked from Minki/linux
5bef0a153b
In time-travel mode, cpu_relax() currently does actual CPU relax, but that doesn't affect the simulation. Ideally, we wouldn't run anything that uses it in simulation, but if we actually have virtio devices combined with the same simulation it's possible. Implement cpu_relax() as ndelay(1) in this case, using time_travel_ndelay(1) directly to catch errors if this is used erroneously in builds that don't set CONFIG_UML_TIME_TRAVEL_SUPPORT. While at it, convert it to an __always_inline and also add that to rep_nop() like the original does now. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
44 lines
997 B
C
44 lines
997 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __UM_PROCESSOR_H
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#define __UM_PROCESSOR_H
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#include <linux/time-internal.h>
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/* include faultinfo structure */
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#include <sysdep/faultinfo.h>
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#ifdef CONFIG_X86_32
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# include "processor_32.h"
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#else
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# include "processor_64.h"
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#endif
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#define KSTK_EIP(tsk) KSTK_REG(tsk, HOST_IP)
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#define KSTK_ESP(tsk) KSTK_REG(tsk, HOST_SP)
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#define KSTK_EBP(tsk) KSTK_REG(tsk, HOST_BP)
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#define ARCH_IS_STACKGROW(address) \
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(address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(¤t->thread.regs.regs))
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#include <asm/user.h>
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/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
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static __always_inline void rep_nop(void)
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{
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__asm__ __volatile__("rep;nop": : :"memory");
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}
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static __always_inline void cpu_relax(void)
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{
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if (time_travel_mode == TT_MODE_INFCPU ||
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time_travel_mode == TT_MODE_EXTERNAL)
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time_travel_ndelay(1);
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else
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rep_nop();
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}
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#define task_pt_regs(t) (&(t)->thread.regs)
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#include <asm/processor-generic.h>
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#endif
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