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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timebase.h (1929B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Common timebase prototypes and such for all ppc machines.
      4 */
      5
      6#ifndef _ASM_POWERPC_VDSO_TIMEBASE_H
      7#define _ASM_POWERPC_VDSO_TIMEBASE_H
      8
      9#include <asm/reg.h>
     10
     11/*
     12 * We use __powerpc64__ here because we want the compat VDSO to use the 32-bit
     13 * version below in the else case of the ifdef.
     14 */
     15#if defined(__powerpc64__) && (defined(CONFIG_PPC_CELL) || defined(CONFIG_E500))
     16#define mftb()		({unsigned long rval;				\
     17			asm volatile(					\
     18				"90:	mfspr %0, %2;\n"		\
     19				ASM_FTR_IFSET(				\
     20					"97:	cmpwi %0,0;\n"		\
     21					"	beq- 90b;\n", "", %1)	\
     22			: "=r" (rval) \
     23			: "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL) : "cr0"); \
     24			rval;})
     25#elif defined(CONFIG_PPC_8xx)
     26#define mftb()		({unsigned long rval;	\
     27			asm volatile("mftbl %0" : "=r" (rval)); rval;})
     28#else
     29#define mftb()		({unsigned long rval;	\
     30			asm volatile("mfspr %0, %1" : \
     31				     "=r" (rval) : "i" (SPRN_TBRL)); rval;})
     32#endif /* !CONFIG_PPC_CELL */
     33
     34#if defined(CONFIG_PPC_8xx)
     35#define mftbu()		({unsigned long rval;	\
     36			asm volatile("mftbu %0" : "=r" (rval)); rval;})
     37#else
     38#define mftbu()		({unsigned long rval;	\
     39			asm volatile("mfspr %0, %1" : "=r" (rval) : \
     40				"i" (SPRN_TBRU)); rval;})
     41#endif
     42
     43#define mttbl(v)	asm volatile("mttbl %0":: "r"(v))
     44#define mttbu(v)	asm volatile("mttbu %0":: "r"(v))
     45
     46static __always_inline u64 get_tb(void)
     47{
     48	unsigned int tbhi, tblo, tbhi2;
     49
     50	/*
     51	 * We use __powerpc64__ here not CONFIG_PPC64 because we want the compat
     52	 * VDSO to use the 32-bit compatible version in the while loop below.
     53	 */
     54	if (__is_defined(__powerpc64__))
     55		return mftb();
     56
     57	do {
     58		tbhi = mftbu();
     59		tblo = mftb();
     60		tbhi2 = mftbu();
     61	} while (tbhi != tbhi2);
     62
     63	return ((u64)tbhi << 32) | tblo;
     64}
     65
     66static inline void set_tb(unsigned int upper, unsigned int lower)
     67{
     68	mtspr(SPRN_TBWL, 0);
     69	mtspr(SPRN_TBWU, upper);
     70	mtspr(SPRN_TBWL, lower);
     71}
     72
     73#endif /* _ASM_POWERPC_VDSO_TIMEBASE_H */