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https://github.com/edk2-porting/linux-next.git
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de4f6e5b41
The header files in the asm-xtensa directory are not clean and 'make headers_check' fails. This is a first patch to fix most of the header files. It removes unnecessary include statements and adds some that are required for building the kernel. The linker script required some updates or the linking stage would fail. Signed-off-by: Chris Zankel <chris@zankel.net>
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/*
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* include/asm-xtensa/bitops.h
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*
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* Atomic operations that C can't guarantee us.Useful for resource counting etc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2007 Tensilica Inc.
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*/
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#ifndef _XTENSA_BITOPS_H
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#define _XTENSA_BITOPS_H
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#ifdef __KERNEL__
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#include <asm/processor.h>
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#include <asm/byteorder.h>
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#include <asm/system.h>
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#ifdef CONFIG_SMP
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# error SMP not supported on this architecture
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#endif
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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#include <asm-generic/bitops/atomic.h>
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#include <asm-generic/bitops/non-atomic.h>
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#if XCHAL_HAVE_NSA
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static inline unsigned long __cntlz (unsigned long x)
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{
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int lz;
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asm ("nsau %0, %1" : "=r" (lz) : "r" (x));
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return lz;
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}
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/*
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* ffz: Find first zero in word. Undefined if no zero exists.
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* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
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*/
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static inline int ffz(unsigned long x)
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{
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return 31 - __cntlz(~x & -~x);
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}
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/*
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* __ffs: Find first bit set in word. Return 0 for bit 0
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*/
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static inline int __ffs(unsigned long x)
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{
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return 31 - __cntlz(x & -x);
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}
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/*
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* ffs: Find first bit set in word. This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(unsigned long x)
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{
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return 32 - __cntlz(x & -x);
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}
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/*
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* fls: Find last (most-significant) bit set in word.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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static inline int fls (unsigned int x)
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{
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return 32 - __cntlz(x);
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}
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#else
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/* Use the generic implementation if we don't have the nsa/nsau instructions. */
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# include <asm-generic/bitops/ffs.h>
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# include <asm-generic/bitops/__ffs.h>
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# include <asm-generic/bitops/ffz.h>
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# include <asm-generic/bitops/fls.h>
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#endif
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/ext2-non-atomic.h>
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#ifdef __XTENSA_EL__
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# define ext2_set_bit_atomic(lock,nr,addr) \
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test_and_set_bit((nr), (unsigned long*)(addr))
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# define ext2_clear_bit_atomic(lock,nr,addr) \
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test_and_clear_bit((nr), (unsigned long*)(addr))
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#elif defined(__XTENSA_EB__)
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# define ext2_set_bit_atomic(lock,nr,addr) \
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test_and_set_bit((nr) ^ 0x18, (unsigned long*)(addr))
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# define ext2_clear_bit_atomic(lock,nr,addr) \
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test_and_clear_bit((nr) ^ 0x18, (unsigned long*)(addr))
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#else
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# error processor byte order undefined!
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#endif
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/minix.h>
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_BITOPS_H */
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