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riscv: define find_{first,next}_zero_bit in asm/bitops.h

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These seem to be missing, and trying to build fastboot cmd without
them is causing errors due to these being missing.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Tested-by: E Shattow <lucent@gmail.com
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Maxim Kochetkov
2024-07-26 15:07:21 +03:00
committed by Leo Yu-Chi Liang
parent e0495c9186
commit bbbb2ef4a7
1 changed files with 40 additions and 0 deletions
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40
arch/riscv/include/asm/bitops.h
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@@ -138,6 +138,43 @@ static inline unsigned long ffz(unsigned long word)
return k;
}
static inline int find_next_zero_bit(void *addr, int size, int offset)
{
unsigned long *p = ((unsigned long *)addr) + (offset / BITS_PER_LONG);
unsigned long result = offset & ~(BITS_PER_LONG - 1);
unsigned long tmp;
if (offset >= size)
return size;
size -= result;
offset &= (BITS_PER_LONG - 1);
if (offset) {
tmp = *(p++);
tmp |= ~0UL >> (BITS_PER_LONG - offset);
if (size < BITS_PER_LONG)
goto found_first;
if (~tmp)
goto found_middle;
size -= BITS_PER_LONG;
result += BITS_PER_LONG;
}
while (size & ~(BITS_PER_LONG - 1)) {
tmp = *(p++);
if (~tmp)
goto found_middle;
result += BITS_PER_LONG;
size -= BITS_PER_LONG;
}
if (!size)
return result;
tmp = *p;
found_first:
tmp |= ~0UL << size;
found_middle:
return result + ffz(tmp);
}
/*
* ffs: find first bit set. This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
@@ -158,6 +195,9 @@ static inline unsigned long ffz(unsigned long word)
#define hweight16(x) generic_hweight16(x)
#define hweight8(x) generic_hweight8(x)
#define find_first_zero_bit(addr, size) \
find_next_zero_bit((addr), (size), 0)
#define test_and_set_bit __test_and_set_bit
#define test_and_clear_bit __test_and_clear_bit