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powerpc/time: Move timebase functions into new asm/vdso/timebase.h
In order to easily use get_tb() from C VDSO, move timebase functions into a new header named asm/vdso/timebase.h Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201126131006.2431205-3-mpe@ellerman.id.au
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Christophe Leroy
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Michael Ellerman
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Dec 3, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0-or-later */ | ||
| /* | ||
| * Common timebase prototypes and such for all ppc machines. | ||
| */ | ||
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| #ifndef _ASM_POWERPC_VDSO_TIMEBASE_H | ||
| #define _ASM_POWERPC_VDSO_TIMEBASE_H | ||
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| #include <asm/reg.h> | ||
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| #if defined(CONFIG_PPC_CELL) || defined(CONFIG_E500) | ||
| #define mftb() ({unsigned long rval; \ | ||
| asm volatile( \ | ||
| "90: mfspr %0, %2;\n" \ | ||
| ASM_FTR_IFSET( \ | ||
| "97: cmpwi %0,0;\n" \ | ||
| " beq- 90b;\n", "", %1) \ | ||
| : "=r" (rval) \ | ||
| : "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL) : "cr0"); \ | ||
| rval;}) | ||
| #elif defined(CONFIG_PPC_8xx) | ||
| #define mftb() ({unsigned long rval; \ | ||
| asm volatile("mftbl %0" : "=r" (rval)); rval;}) | ||
| #else | ||
| #define mftb() ({unsigned long rval; \ | ||
| asm volatile("mfspr %0, %1" : \ | ||
| "=r" (rval) : "i" (SPRN_TBRL)); rval;}) | ||
| #endif /* !CONFIG_PPC_CELL */ | ||
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| #if defined(CONFIG_PPC_8xx) | ||
| #define mftbu() ({unsigned long rval; \ | ||
| asm volatile("mftbu %0" : "=r" (rval)); rval;}) | ||
| #else | ||
| #define mftbu() ({unsigned long rval; \ | ||
| asm volatile("mfspr %0, %1" : "=r" (rval) : \ | ||
| "i" (SPRN_TBRU)); rval;}) | ||
| #endif | ||
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| #define mttbl(v) asm volatile("mttbl %0":: "r"(v)) | ||
| #define mttbu(v) asm volatile("mttbu %0":: "r"(v)) | ||
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| /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ | ||
| static inline unsigned long get_tbl(void) | ||
| { | ||
| return mftb(); | ||
| } | ||
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| static inline u64 get_tb(void) | ||
| { | ||
| unsigned int tbhi, tblo, tbhi2; | ||
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| if (IS_ENABLED(CONFIG_PPC64)) | ||
| return mftb(); | ||
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| do { | ||
| tbhi = mftbu(); | ||
| tblo = mftb(); | ||
| tbhi2 = mftbu(); | ||
| } while (tbhi != tbhi2); | ||
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| return ((u64)tbhi << 32) | tblo; | ||
| } | ||
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| static inline void set_tb(unsigned int upper, unsigned int lower) | ||
| { | ||
| mtspr(SPRN_TBWL, 0); | ||
| mtspr(SPRN_TBWU, upper); | ||
| mtspr(SPRN_TBWL, lower); | ||
| } | ||
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| #endif /* _ASM_POWERPC_VDSO_TIMEBASE_H */ |