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Implement the ffs and fls functions, and their longer counterparts, in

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cpufunc, in terms of __builtin_ffs and the like, for arm32 v6 and v7
architectures, and use those, rather than the simple libkern
implementations, in building arm32 kernels.

Reviewed by: manu
Approved by: kib, markj (mentors)
Tested by: iz-rpi03_hs-karlsruhe.de, mikael.urankar_gmail.com, ian
Differential Revision: https://reviews.freebsd.org/D20412
This commit is contained in:
Doug Moore 2019-05-28 15:47:00 +00:00
parent de25327313
commit 1c76d3a9fb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348327
2 changed files with 64 additions and 6 deletions
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58
sys/arm/include/cpufunc.h
View File

@ -359,6 +359,64 @@ extern u_int arm_cache_level;
extern u_int arm_cache_loc;
extern u_int arm_cache_type[14];
#if __ARM_ARCH >= 6
#define HAVE_INLINE_FFS
static __inline __pure2 int
ffs(int mask)
{
return (__builtin_ffs(mask));
}
#define HAVE_INLINE_FFSL
static __inline __pure2 int
ffsl(long mask)
{
return (__builtin_ffsl(mask));
}
#define HAVE_INLINE_FFSLL
static __inline __pure2 int
ffsll(long long mask)
{
return (__builtin_ffsll(mask));
}
#define HAVE_INLINE_FLS
static __inline __pure2 int
fls(int mask)
{
return (mask == 0 ? 0 :
8 * sizeof(mask) - __builtin_clz((u_int)mask));
}
#define HAVE_INLINE_FLSL
static __inline __pure2 int
flsl(long mask)
{
return (mask == 0 ? 0 :
8 * sizeof(mask) - __builtin_clzl((u_long)mask));
}
#define HAVE_INLINE_FLSLL
static __inline __pure2 int
flsll(long long mask)
{
return (mask == 0 ? 0 :
8 * sizeof(mask) - __builtin_clzll((unsigned long long)mask));
}
#endif
#else /* !_KERNEL */
static __inline void

12
sys/conf/files.arm
View File

@ -129,7 +129,7 @@ kern/subr_devmap.c standard
kern/subr_sfbuf.c standard
libkern/arm/aeabi_unwind.c standard
libkern/arm/divsi3.S standard
libkern/arm/ffs.S standard
libkern/arm/ffs.S optional !armv7 !armv6
libkern/arm/ldivmod.S standard
libkern/arm/ldivmod_helper.c standard
libkern/arm/memclr.S standard
@ -139,11 +139,11 @@ libkern/arm/muldi3.c standard
libkern/ashldi3.c standard
libkern/ashrdi3.c standard
libkern/divdi3.c standard
libkern/ffsl.c standard
libkern/ffsll.c standard
libkern/fls.c standard
libkern/flsl.c standard
libkern/flsll.c standard
libkern/ffsl.c optional !armv7 !armv6
libkern/ffsll.c optional !armv7 !armv6
libkern/fls.c optional !armv7 !armv6
libkern/flsl.c optional !armv7 !armv6
libkern/flsll.c optional !armv7 !armv6
libkern/lshrdi3.c standard
libkern/memcmp.c standard
libkern/moddi3.c standard