add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/include/asm/time.h
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@@ -1,13 +1,9 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * Common time prototypes and such for all ppc machines.
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  *
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  * Written by Cort Dougan (cort@cs.nmt.edu) to merge
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  * Paul Mackerras' version and mine for PReP and Pmac.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #ifndef __POWERPC_TIME_H
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@@ -28,7 +24,6 @@
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24
 
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 extern void generic_calibrate_decr(void);
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-extern void hdec_interrupt(struct pt_regs *regs);
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 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
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 extern unsigned long ppc_proc_freq;
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@@ -36,66 +31,17 @@
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 extern unsigned long ppc_tb_freq;
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 #define DEFAULT_TB_FREQ		125000000UL
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+extern bool tb_invalid;
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+
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 struct div_result {
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 	u64 result_high;
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 	u64 result_low;
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 };
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-/* Accessor functions for the timebase (RTC on 601) registers. */
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-/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
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-#ifdef CONFIG_6xx
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-#define __USE_RTC()	(cpu_has_feature(CPU_FTR_USE_RTC))
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-#else
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-#define __USE_RTC()	0
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-#endif
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-
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-#ifdef CONFIG_PPC64
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-
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 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
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-#define get_tbl		get_tb
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-
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-#else
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-
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 static inline unsigned long get_tbl(void)
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 {
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-#if defined(CONFIG_403GCX)
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-	unsigned long tbl;
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-	asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
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-	return tbl;
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-#else
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-	return mftbl();
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-#endif
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-}
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-
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-static inline unsigned int get_tbu(void)
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-{
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-#ifdef CONFIG_403GCX
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-	unsigned int tbu;
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-	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
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-	return tbu;
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-#else
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-	return mftbu();
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-#endif
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-}
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-#endif /* !CONFIG_PPC64 */
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-
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-static inline unsigned int get_rtcl(void)
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-{
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-	unsigned int rtcl;
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-
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-	asm volatile("mfrtcl %0" : "=r" (rtcl));
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-	return rtcl;
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-}
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-
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-static inline u64 get_rtc(void)
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-{
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-	unsigned int hi, lo, hi2;
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-
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-	do {
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-		asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
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-			     : "=r" (hi), "=r" (lo), "=r" (hi2));
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-	} while (hi2 != hi);
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-	return (u64)hi * 1000000000 + lo;
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+	return mftb();
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 }
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 static inline u64 get_vtb(void)
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@@ -107,29 +53,20 @@
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 	return 0;
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 }
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-#ifdef CONFIG_PPC64
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-static inline u64 get_tb(void)
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-{
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-	return mftb();
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-}
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-#else /* CONFIG_PPC64 */
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 static inline u64 get_tb(void)
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 {
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 	unsigned int tbhi, tblo, tbhi2;
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+	if (IS_ENABLED(CONFIG_PPC64))
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+		return mftb();
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+
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 	do {
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-		tbhi = get_tbu();
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-		tblo = get_tbl();
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-		tbhi2 = get_tbu();
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+		tbhi = mftbu();
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+		tblo = mftb();
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+		tbhi2 = mftbu();
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 	} while (tbhi != tbhi2);
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 	return ((u64)tbhi << 32) | tblo;
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-}
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-#endif /* !CONFIG_PPC64 */
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-
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-static inline u64 get_tb_or_rtc(void)
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-{
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-	return __USE_RTC() ? get_rtc() : get_tb();
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 }
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 static inline void set_tb(unsigned int upper, unsigned int lower)
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@@ -147,11 +84,10 @@
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  */
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 static inline u64 get_dec(void)
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 {
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-#if defined(CONFIG_40x)
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-	return (mfspr(SPRN_PIT));
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-#else
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-	return (mfspr(SPRN_DEC));
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-#endif
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+	if (IS_ENABLED(CONFIG_40x))
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+		return mfspr(SPRN_PIT);
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+
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+	return mfspr(SPRN_DEC);
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 }
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 /*
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@@ -161,23 +97,17 @@
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  */
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 static inline void set_dec(u64 val)
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 {
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-#if defined(CONFIG_40x)
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-	mtspr(SPRN_PIT, (u32) val);
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-#else
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-#ifndef CONFIG_BOOKE
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-	--val;
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-#endif
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-	mtspr(SPRN_DEC, val);
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-#endif /* not 40x */
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+	if (IS_ENABLED(CONFIG_40x))
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+		mtspr(SPRN_PIT, (u32)val);
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+	else if (IS_ENABLED(CONFIG_BOOKE))
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+		mtspr(SPRN_DEC, val);
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+	else
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+		mtspr(SPRN_DEC, val - 1);
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 }
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 static inline unsigned long tb_ticks_since(unsigned long tstamp)
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 {
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-	if (__USE_RTC()) {
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-		int delta = get_rtcl() - (unsigned int) tstamp;
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-		return delta < 0 ? delta + 1000000000 : delta;
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-	}
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-	return get_tbl() - tstamp;
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+	return mftb() - tstamp;
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 }
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 #define mulhwu(x,y) \
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@@ -201,5 +131,8 @@
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 /* Convert timebase ticks to nanoseconds */
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 unsigned long long tb_to_ns(unsigned long long tb_ticks);
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+/* SPLPAR */
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+void accumulate_stolen_time(void);
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+
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 #endif /* __KERNEL__ */
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 #endif /* __POWERPC_TIME_H */