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lx_emul(x86): shadow cpu_relax to advance jiffies

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The i2c code has a busy loop (see commit for the location), which expects that
the jiffies advances without a cooperative scheduling decision.

Issue #4450
This commit is contained in:
Alexander Boettcher 2022-03-23 13:28:43 +01:00 committed by Christian Helmuth
parent 18c5f1e90d
commit 00479aea29
2 changed files with 44 additions and 0 deletions
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42
repos/pc/src/drivers/framebuffer/intel/pc/shadow/asm/vdso/processor.h Normal file
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@ -0,0 +1,42 @@
/**
* \brief Shadow copy of asm/vdso/processor.h
* \author Alexander Boettcher
* \date 2022-03-23
*/
/*
* Copyright (C) 2022 Genode Labs GmbH
*
* This file is distributed under the terms of the GNU General Public License
* version 2.
*/
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_VDSO_PROCESSOR_H
#define __ASM_VDSO_PROCESSOR_H
#ifndef __ASSEMBLY__
#include <linux/delay.h>
#include <linux/jiffies.h>
extern u64 jiffies_64;
static __always_inline void rep_nop(void)
{
asm volatile("rep; nop" ::: "memory");
}
static __always_inline void cpu_relax(void)
{
/* break busy loop of slchi() in drivers/i2c/algos/i2c-algo-bit.c */
u64 const us = jiffies_to_usecs(1);
usleep_range(us, us);
}
#endif /* __ASSEMBLY__ */
#endif /* __ASM_VDSO_PROCESSOR_H */

2
repos/pc/src/drivers/framebuffer/intel/pc/target.inc
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@ -6,6 +6,8 @@ TARGET := pc_intel_fb_drv
LIBS := base pc_lx_emul blit
INC_DIR += $(REL_PRG_DIR)
INC_DIR += $(REL_PRG_DIR)/shadow
SRC_CC += main.cc
SRC_CC += misc.cc
SRC_CC += time.cc