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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/powerpc/include/asm/word-at-a-time.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/include/asm/word-at-a-time.h')
-rw-r--r-- | arch/powerpc/include/asm/word-at-a-time.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/word-at-a-time.h b/arch/powerpc/include/asm/word-at-a-time.h new file mode 100644 index 000000000..30a12d208 --- /dev/null +++ b/arch/powerpc/include/asm/word-at-a-time.h @@ -0,0 +1,206 @@ +#ifndef _ASM_WORD_AT_A_TIME_H +#define _ASM_WORD_AT_A_TIME_H + +/* + * Word-at-a-time interfaces for PowerPC. + */ + +#include <linux/kernel.h> +#include <asm/asm-compat.h> +#include <asm/extable.h> + +#ifdef __BIG_ENDIAN__ + +struct word_at_a_time { + const unsigned long high_bits, low_bits; +}; + +#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0xfe) + 1, REPEAT_BYTE(0x7f) } + +/* Bit set in the bytes that have a zero */ +static inline long prep_zero_mask(unsigned long val, unsigned long rhs, const struct word_at_a_time *c) +{ + unsigned long mask = (val & c->low_bits) + c->low_bits; + return ~(mask | rhs); +} + +#define create_zero_mask(mask) (mask) + +static inline long find_zero(unsigned long mask) +{ + long leading_zero_bits; + + asm (PPC_CNTLZL "%0,%1" : "=r" (leading_zero_bits) : "r" (mask)); + return leading_zero_bits >> 3; +} + +static inline unsigned long has_zero(unsigned long val, unsigned long *data, const struct word_at_a_time *c) +{ + unsigned long rhs = val | c->low_bits; + *data = rhs; + return (val + c->high_bits) & ~rhs; +} + +static inline unsigned long zero_bytemask(unsigned long mask) +{ + return ~1ul << __fls(mask); +} + +#else + +#ifdef CONFIG_64BIT + +/* unused */ +struct word_at_a_time { +}; + +#define WORD_AT_A_TIME_CONSTANTS { } + +/* This will give us 0xff for a NULL char and 0x00 elsewhere */ +static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c) +{ + unsigned long ret; + unsigned long zero = 0; + + asm("cmpb %0,%1,%2" : "=r" (ret) : "r" (a), "r" (zero)); + *bits = ret; + + return ret; +} + +static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c) +{ + return bits; +} + +/* Alan Modra's little-endian strlen tail for 64-bit */ +static inline unsigned long create_zero_mask(unsigned long bits) +{ + unsigned long leading_zero_bits; + long trailing_zero_bit_mask; + + asm("addi %1,%2,-1\n\t" + "andc %1,%1,%2\n\t" + "popcntd %0,%1" + : "=r" (leading_zero_bits), "=&r" (trailing_zero_bit_mask) + : "b" (bits)); + + return leading_zero_bits; +} + +static inline unsigned long find_zero(unsigned long mask) +{ + return mask >> 3; +} + +/* This assumes that we never ask for an all 1s bitmask */ +static inline unsigned long zero_bytemask(unsigned long mask) +{ + return (1UL << mask) - 1; +} + +#else /* 32-bit case */ + +struct word_at_a_time { + const unsigned long one_bits, high_bits; +}; + +#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) } + +/* + * This is largely generic for little-endian machines, but the + * optimal byte mask counting is probably going to be something + * that is architecture-specific. If you have a reliably fast + * bit count instruction, that might be better than the multiply + * and shift, for example. + */ + +/* Carl Chatfield / Jan Achrenius G+ version for 32-bit */ +static inline long count_masked_bytes(long mask) +{ + /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */ + long a = (0x0ff0001+mask) >> 23; + /* Fix the 1 for 00 case */ + return a & mask; +} + +static inline unsigned long create_zero_mask(unsigned long bits) +{ + bits = (bits - 1) & ~bits; + return bits >> 7; +} + +static inline unsigned long find_zero(unsigned long mask) +{ + return count_masked_bytes(mask); +} + +/* Return nonzero if it has a zero */ +static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c) +{ + unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits; + *bits = mask; + return mask; +} + +static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c) +{ + return bits; +} + +/* The mask we created is directly usable as a bytemask */ +#define zero_bytemask(mask) (mask) + +#endif /* CONFIG_64BIT */ + +#endif /* __BIG_ENDIAN__ */ + +/* + * We use load_unaligned_zero() in a selftest, which builds a userspace + * program. Some linker scripts seem to discard the .fixup section, so allow + * the test code to use a different section name. + */ +#ifndef FIXUP_SECTION +#define FIXUP_SECTION ".fixup" +#endif + +static inline unsigned long load_unaligned_zeropad(const void *addr) +{ + unsigned long ret, offset, tmp; + + asm( + "1: " PPC_LL "%[ret], 0(%[addr])\n" + "2:\n" + ".section " FIXUP_SECTION ",\"ax\"\n" + "3: " +#ifdef __powerpc64__ + "clrrdi %[tmp], %[addr], 3\n\t" + "clrlsldi %[offset], %[addr], 61, 3\n\t" + "ld %[ret], 0(%[tmp])\n\t" +#ifdef __BIG_ENDIAN__ + "sld %[ret], %[ret], %[offset]\n\t" +#else + "srd %[ret], %[ret], %[offset]\n\t" +#endif +#else + "clrrwi %[tmp], %[addr], 2\n\t" + "clrlslwi %[offset], %[addr], 30, 3\n\t" + "lwz %[ret], 0(%[tmp])\n\t" +#ifdef __BIG_ENDIAN__ + "slw %[ret], %[ret], %[offset]\n\t" +#else + "srw %[ret], %[ret], %[offset]\n\t" +#endif +#endif + "b 2b\n" + ".previous\n" + EX_TABLE(1b, 3b) + : [tmp] "=&b" (tmp), [offset] "=&r" (offset), [ret] "=&r" (ret) + : [addr] "b" (addr), "m" (*(unsigned long *)addr)); + + return ret; +} + +#undef FIXUP_SECTION + +#endif /* _ASM_WORD_AT_A_TIME_H */ |