1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Common timebase prototypes and such for all ppc machines.
6 #ifndef _ASM_POWERPC_VDSO_TIMEBASE_H
7 #define _ASM_POWERPC_VDSO_TIMEBASE_H
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.
15 #if defined(__powerpc64__) && (defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_E500))
16 #define mftb() ({unsigned long rval; \
18 "90: mfspr %0, %2;\n" \
21 " beq- 90b;\n", "", %1) \
23 : "i" (CPU_FTR_CELL_TB_BUG), "i" (SPRN_TBRL) : "cr0"); \
25 #elif defined(CONFIG_PPC_8xx)
26 #define mftb() ({unsigned long rval; \
27 asm volatile("mftbl %0" : "=r" (rval)); rval;})
29 #define mftb() ({unsigned long rval; \
30 asm volatile("mfspr %0, %1" : \
31 "=r" (rval) : "i" (SPRN_TBRL)); rval;})
32 #endif /* !CONFIG_PPC_CELL */
34 #if defined(CONFIG_PPC_8xx)
35 #define mftbu() ({unsigned long rval; \
36 asm volatile("mftbu %0" : "=r" (rval)); rval;})
38 #define mftbu() ({unsigned long rval; \
39 asm volatile("mfspr %0, %1" : "=r" (rval) : \
40 "i" (SPRN_TBRU)); rval;})
43 #define mttbl(v) asm volatile("mttbl %0":: "r"(v))
44 #define mttbu(v) asm volatile("mttbu %0":: "r"(v))
46 static __always_inline u64 get_tb(void)
48 unsigned int tbhi, tblo, tbhi2;
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.
54 if (__is_defined(__powerpc64__))
61 } while (tbhi != tbhi2);
63 return ((u64)tbhi << 32) | tblo;
66 static inline void set_tb(unsigned int upper, unsigned int lower)
69 mtspr(SPRN_TBWU, upper);
70 mtspr(SPRN_TBWL, lower);
73 #endif /* _ASM_POWERPC_VDSO_TIMEBASE_H */