From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/mips/include/asm/timex.h | 103 +++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 kernel/arch/mips/include/asm/timex.h (limited to 'kernel/arch/mips/include/asm/timex.h') diff --git a/kernel/arch/mips/include/asm/timex.h b/kernel/arch/mips/include/asm/timex.h new file mode 100644 index 000000000..b05bb70a2 --- /dev/null +++ b/kernel/arch/mips/include/asm/timex.h @@ -0,0 +1,103 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1998, 1999, 2003 by Ralf Baechle + * Copyright (C) 2014 by Maciej W. Rozycki + */ +#ifndef _ASM_TIMEX_H +#define _ASM_TIMEX_H + +#ifdef __KERNEL__ + +#include + +#include +#include +#include +#include + +/* + * This is the clock rate of the i8253 PIT. A MIPS system may not have + * a PIT by the symbol is used all over the kernel including some APIs. + * So keeping it defined to the number for the PIT is the only sane thing + * for now. + */ +#define CLOCK_TICK_RATE 1193182 + +/* + * Standard way to access the cycle counter. + * Currently only used on SMP for scheduling. + * + * Only the low 32 bits are available as a continuously counting entity. + * But this only means we'll force a reschedule every 8 seconds or so, + * which isn't an evil thing. + * + * We know that all SMP capable CPUs have cycle counters. + */ + +typedef unsigned int cycles_t; + +/* + * On R4000/R4400 before version 5.0 an erratum exists such that if the + * cycle counter is read in the exact moment that it is matching the + * compare register, no interrupt will be generated. + * + * There is a suggested workaround and also the erratum can't strike if + * the compare interrupt isn't being used as the clock source device. + * However for now the implementaton of this function doesn't get these + * fine details right. + */ +static inline int can_use_mips_counter(unsigned int prid) +{ + int comp = (prid & PRID_COMP_MASK) != PRID_COMP_LEGACY; + + if (__builtin_constant_p(cpu_has_counter) && !cpu_has_counter) + return 0; + else if (__builtin_constant_p(cpu_has_mips_r) && cpu_has_mips_r) + return 1; + else if (likely(!__builtin_constant_p(cpu_has_mips_r) && comp)) + return 1; + /* Make sure we don't peek at cpu_data[0].options in the fast path! */ + if (!__builtin_constant_p(cpu_has_counter)) + asm volatile("" : "=m" (cpu_data[0].options)); + if (likely(cpu_has_counter && + prid >= (PRID_IMP_R4000 | PRID_REV_ENCODE_44(5, 0)))) + return 1; + else + return 0; +} + +static inline cycles_t get_cycles(void) +{ + if (can_use_mips_counter(read_c0_prid())) + return read_c0_count(); + else + return 0; /* no usable counter */ +} + +/* + * Like get_cycles - but where c0_count is not available we desperately + * use c0_random in an attempt to get at least a little bit of entropy. + * + * R6000 and R6000A neither have a count register nor a random register. + * That leaves no entropy source in the CPU itself. + */ +static inline unsigned long random_get_entropy(void) +{ + unsigned int prid = read_c0_prid(); + unsigned int imp = prid & PRID_IMP_MASK; + + if (can_use_mips_counter(prid)) + return read_c0_count(); + else if (likely(imp != PRID_IMP_R6000 && imp != PRID_IMP_R6000A)) + return read_c0_random(); + else + return 0; /* no usable register */ +} +#define random_get_entropy random_get_entropy + +#endif /* __KERNEL__ */ + +#endif /* _ASM_TIMEX_H */ -- cgit 1.2.3-korg