cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irqflags.h (1777B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * IRQ flags handling
      4 */
      5#ifndef _ASM_IRQFLAGS_H
      6#define _ASM_IRQFLAGS_H
      7
      8#ifndef __ASSEMBLY__
      9/*
     10 * Get definitions for arch_local_save_flags(x), etc.
     11 */
     12#include <asm/hw_irq.h>
     13
     14#else
     15#ifdef CONFIG_TRACE_IRQFLAGS
     16#ifdef CONFIG_IRQSOFF_TRACER
     17/*
     18 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
     19 * which is the stack frame here, we need to force a stack frame
     20 * in case we came from user space.
     21 */
     22#define TRACE_WITH_FRAME_BUFFER(func)		\
     23	mflr	r0;				\
     24	stdu	r1, -STACK_FRAME_OVERHEAD(r1);	\
     25	std	r0, 16(r1);			\
     26	stdu	r1, -STACK_FRAME_OVERHEAD(r1);	\
     27	bl func;				\
     28	ld	r1, 0(r1);			\
     29	ld	r1, 0(r1);
     30#else
     31#define TRACE_WITH_FRAME_BUFFER(func)		\
     32	bl func;
     33#endif
     34
     35/*
     36 * These are calls to C code, so the caller must be prepared for volatiles to
     37 * be clobbered.
     38 */
     39#define TRACE_ENABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
     40#define TRACE_DISABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
     41
     42/*
     43 * This is used by assembly code to soft-disable interrupts first and
     44 * reconcile irq state.
     45 *
     46 * NB: This may call C code, so the caller must be prepared for volatiles to
     47 * be clobbered.
     48 */
     49#define RECONCILE_IRQ_STATE(__rA, __rB)		\
     50	lbz	__rA,PACAIRQSOFTMASK(r13);	\
     51	lbz	__rB,PACAIRQHAPPENED(r13);	\
     52	andi.	__rA,__rA,IRQS_DISABLED;	\
     53	li	__rA,IRQS_DISABLED;		\
     54	ori	__rB,__rB,PACA_IRQ_HARD_DIS;	\
     55	stb	__rB,PACAIRQHAPPENED(r13);	\
     56	bne	44f;				\
     57	stb	__rA,PACAIRQSOFTMASK(r13);	\
     58	TRACE_DISABLE_INTS;			\
     5944:
     60
     61#else
     62#define TRACE_ENABLE_INTS
     63#define TRACE_DISABLE_INTS
     64
     65#define RECONCILE_IRQ_STATE(__rA, __rB)		\
     66	lbz	__rA,PACAIRQHAPPENED(r13);	\
     67	li	__rB,IRQS_DISABLED;		\
     68	ori	__rA,__rA,PACA_IRQ_HARD_DIS;	\
     69	stb	__rB,PACAIRQSOFTMASK(r13);	\
     70	stb	__rA,PACAIRQHAPPENED(r13)
     71#endif
     72#endif
     73
     74#endif