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[Deepin-Kernel-SIG] [linux 6.18.y] [FROMLIST] genksyms: Support arm64 CRC32 hardware acceleration #1759

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[Deepin-Kernel-SIG] [linux 6.18.y] [FROMLIST] genksyms: Support arm64 CRC32 hardware acceleration #1759

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34 changes: 34 additions & 0 deletions scripts/genksyms/genksyms.c
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Original file line number Diff line number Diff line change
Expand Up @@ -116,8 +116,40 @@ static const uint32_t crctab32[] = {
0x2d02ef8dU
};

/*
* Architecture-specific CRC32 hardware acceleration.
*/
static int crc32_hw_available;

#ifdef __aarch64__
#include <sys/auxv.h>
#include <asm/hwcap.h>

static void crc32_check_hw(void)
{
crc32_hw_available = (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0;
}
Comment on lines +124 to +131
Comment on lines +125 to +131

static inline uint32_t crc32_hw_byte(uint8_t c, uint32_t crc)
{
asm volatile(".arch_extension crc\n\t"
"crc32b %w0, %w0, %w1" : "+r"(crc) : "r"(c));
return crc;
}

#else
static void crc32_check_hw(void)
{
crc32_hw_available = 0;
}
#endif

static uint32_t partial_crc32_one(uint8_t c, uint32_t crc)
{
#if defined(__aarch64__)
if (__builtin_expect(crc32_hw_available, 0))
return crc32_hw_byte(c, crc);
#endif
return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
}

Expand Down Expand Up @@ -740,6 +772,8 @@ int main(int argc, char **argv)
FILE *dumpfile = NULL, *ref_file = NULL;
int o;

crc32_check_hw();

struct option long_opts[] = {
{"debug", 0, 0, 'd'},
{"warnings", 0, 0, 'w'},
Expand Down
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