| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Accelerated CRC32(C) using AArch64 CRC and PMULL instructions |
| * |
| * Copyright (C) 2016 - 2018 Linaro Ltd. |
| * Copyright (C) 2024 Google LLC |
| * |
| * Author: Ard Biesheuvel <ardb@kernel.org> |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| .cpu generic+crc+crypto |
| |
| .macro bitle, reg |
| .endm |
| |
| .macro bitbe, reg |
| rbit \reg, \reg |
| .endm |
| |
| .macro bytele, reg |
| .endm |
| |
| .macro bytebe, reg |
| rbit \reg, \reg |
| lsr \reg, \reg, #24 |
| .endm |
| |
| .macro hwordle, reg |
| CPU_BE( rev16 \reg, \reg ) |
| .endm |
| |
| .macro hwordbe, reg |
| CPU_LE( rev \reg, \reg ) |
| rbit \reg, \reg |
| CPU_BE( lsr \reg, \reg, #16 ) |
| .endm |
| |
| .macro le, regs:vararg |
| .irp r, \regs |
| CPU_BE( rev \r, \r ) |
| .endr |
| .endm |
| |
| .macro be, regs:vararg |
| .irp r, \regs |
| CPU_LE( rev \r, \r ) |
| .endr |
| .irp r, \regs |
| rbit \r, \r |
| .endr |
| .endm |
| |
| .macro __crc32, c, order=le |
| bit\order w0 |
| cmp x2, #16 |
| b.lt 8f // less than 16 bytes |
| |
| and x7, x2, #0x1f |
| and x2, x2, #~0x1f |
| cbz x7, 32f // multiple of 32 bytes |
| |
| and x8, x7, #0xf |
| ldp x3, x4, [x1] |
| add x8, x8, x1 |
| add x1, x1, x7 |
| ldp x5, x6, [x8] |
| \order x3, x4, x5, x6 |
| |
| tst x7, #8 |
| crc32\c\()x w8, w0, x3 |
| csel x3, x3, x4, eq |
| csel w0, w0, w8, eq |
| tst x7, #4 |
| lsr x4, x3, #32 |
| crc32\c\()w w8, w0, w3 |
| csel x3, x3, x4, eq |
| csel w0, w0, w8, eq |
| tst x7, #2 |
| lsr w4, w3, #16 |
| crc32\c\()h w8, w0, w3 |
| csel w3, w3, w4, eq |
| csel w0, w0, w8, eq |
| tst x7, #1 |
| crc32\c\()b w8, w0, w3 |
| csel w0, w0, w8, eq |
| tst x7, #16 |
| crc32\c\()x w8, w0, x5 |
| crc32\c\()x w8, w8, x6 |
| csel w0, w0, w8, eq |
| cbz x2, 0f |
| |
| 32: ldp x3, x4, [x1], #32 |
| sub x2, x2, #32 |
| ldp x5, x6, [x1, #-16] |
| \order x3, x4, x5, x6 |
| crc32\c\()x w0, w0, x3 |
| crc32\c\()x w0, w0, x4 |
| crc32\c\()x w0, w0, x5 |
| crc32\c\()x w0, w0, x6 |
| cbnz x2, 32b |
| 0: bit\order w0 |
| ret |
| |
| 8: tbz x2, #3, 4f |
| ldr x3, [x1], #8 |
| \order x3 |
| crc32\c\()x w0, w0, x3 |
| 4: tbz x2, #2, 2f |
| ldr w3, [x1], #4 |
| \order w3 |
| crc32\c\()w w0, w0, w3 |
| 2: tbz x2, #1, 1f |
| ldrh w3, [x1], #2 |
| hword\order w3 |
| crc32\c\()h w0, w0, w3 |
| 1: tbz x2, #0, 0f |
| ldrb w3, [x1] |
| byte\order w3 |
| crc32\c\()b w0, w0, w3 |
| 0: bit\order w0 |
| ret |
| .endm |
| |
| .align 5 |
| SYM_FUNC_START(crc32_le_arm64) |
| __crc32 |
| SYM_FUNC_END(crc32_le_arm64) |
| |
| .align 5 |
| SYM_FUNC_START(crc32c_le_arm64) |
| __crc32 c |
| SYM_FUNC_END(crc32c_le_arm64) |
| |
| .align 5 |
| SYM_FUNC_START(crc32_be_arm64) |
| __crc32 order=be |
| SYM_FUNC_END(crc32_be_arm64) |
| |
| in .req x1 |
| len .req x2 |
| |
| /* |
| * w0: input CRC at entry, output CRC at exit |
| * x1: pointer to input buffer |
| * x2: length of input in bytes |
| */ |
| .macro crc4way, insn, table, order=le |
| bit\order w0 |
| lsr len, len, #6 // len := # of 64-byte blocks |
| |
| /* Process up to 64 blocks of 64 bytes at a time */ |
| .La\@: mov x3, #64 |
| cmp len, #64 |
| csel x3, x3, len, hi // x3 := min(len, 64) |
| sub len, len, x3 |
| |
| /* Divide the input into 4 contiguous blocks */ |
| add x4, x3, x3, lsl #1 // x4 := 3 * x3 |
| add x7, in, x3, lsl #4 // x7 := in + 16 * x3 |
| add x8, in, x3, lsl #5 // x8 := in + 32 * x3 |
| add x9, in, x4, lsl #4 // x9 := in + 16 * x4 |
| |
| /* Load the folding coefficients from the lookup table */ |
| adr_l x5, \table - 12 // entry 0 omitted |
| add x5, x5, x4, lsl #2 // x5 += 12 * x3 |
| ldp s0, s1, [x5] |
| ldr s2, [x5, #8] |
| |
| /* Zero init partial CRCs for this iteration */ |
| mov w4, wzr |
| mov w5, wzr |
| mov w6, wzr |
| mov x17, xzr |
| |
| .Lb\@: sub x3, x3, #1 |
| \insn w6, w6, x17 |
| ldp x10, x11, [in], #16 |
| ldp x12, x13, [x7], #16 |
| ldp x14, x15, [x8], #16 |
| ldp x16, x17, [x9], #16 |
| |
| \order x10, x11, x12, x13, x14, x15, x16, x17 |
| |
| /* Apply the CRC transform to 4 16-byte blocks in parallel */ |
| \insn w0, w0, x10 |
| \insn w4, w4, x12 |
| \insn w5, w5, x14 |
| \insn w6, w6, x16 |
| \insn w0, w0, x11 |
| \insn w4, w4, x13 |
| \insn w5, w5, x15 |
| cbnz x3, .Lb\@ |
| |
| /* Combine the 4 partial results into w0 */ |
| mov v3.d[0], x0 |
| mov v4.d[0], x4 |
| mov v5.d[0], x5 |
| pmull v0.1q, v0.1d, v3.1d |
| pmull v1.1q, v1.1d, v4.1d |
| pmull v2.1q, v2.1d, v5.1d |
| eor v0.8b, v0.8b, v1.8b |
| eor v0.8b, v0.8b, v2.8b |
| mov x5, v0.d[0] |
| eor x5, x5, x17 |
| \insn w0, w6, x5 |
| |
| mov in, x9 |
| cbnz len, .La\@ |
| |
| bit\order w0 |
| ret |
| .endm |
| |
| .align 5 |
| SYM_FUNC_START(crc32c_le_arm64_4way) |
| crc4way crc32cx, .L0 |
| SYM_FUNC_END(crc32c_le_arm64_4way) |
| |
| .align 5 |
| SYM_FUNC_START(crc32_le_arm64_4way) |
| crc4way crc32x, .L1 |
| SYM_FUNC_END(crc32_le_arm64_4way) |
| |
| .align 5 |
| SYM_FUNC_START(crc32_be_arm64_4way) |
| crc4way crc32x, .L1, be |
| SYM_FUNC_END(crc32_be_arm64_4way) |
| |
| .section .rodata, "a", %progbits |
| .align 6 |
| .L0: .long 0xddc0152b, 0xba4fc28e, 0x493c7d27 |
| .long 0x0715ce53, 0x9e4addf8, 0xba4fc28e |
| .long 0xc96cfdc0, 0x0715ce53, 0xddc0152b |
| .long 0xab7aff2a, 0x0d3b6092, 0x9e4addf8 |
| .long 0x299847d5, 0x878a92a7, 0x39d3b296 |
| .long 0xb6dd949b, 0xab7aff2a, 0x0715ce53 |
| .long 0xa60ce07b, 0x83348832, 0x47db8317 |
| .long 0xd270f1a2, 0xb9e02b86, 0x0d3b6092 |
| .long 0x65863b64, 0xb6dd949b, 0xc96cfdc0 |
| .long 0xb3e32c28, 0xbac2fd7b, 0x878a92a7 |
| .long 0xf285651c, 0xce7f39f4, 0xdaece73e |
| .long 0x271d9844, 0xd270f1a2, 0xab7aff2a |
| .long 0x6cb08e5c, 0x2b3cac5d, 0x2162d385 |
| .long 0xcec3662e, 0x1b03397f, 0x83348832 |
| .long 0x8227bb8a, 0xb3e32c28, 0x299847d5 |
| .long 0xd7a4825c, 0xdd7e3b0c, 0xb9e02b86 |
| .long 0xf6076544, 0x10746f3c, 0x18b33a4e |
| .long 0x98d8d9cb, 0x271d9844, 0xb6dd949b |
| .long 0x57a3d037, 0x93a5f730, 0x78d9ccb7 |
| .long 0x3771e98f, 0x6b749fb2, 0xbac2fd7b |
| .long 0xe0ac139e, 0xcec3662e, 0xa60ce07b |
| .long 0x6f345e45, 0xe6fc4e6a, 0xce7f39f4 |
| .long 0xa2b73df1, 0xb0cd4768, 0x61d82e56 |
| .long 0x86d8e4d2, 0xd7a4825c, 0xd270f1a2 |
| .long 0xa90fd27a, 0x0167d312, 0xc619809d |
| .long 0xca6ef3ac, 0x26f6a60a, 0x2b3cac5d |
| .long 0x4597456a, 0x98d8d9cb, 0x65863b64 |
| .long 0xc9c8b782, 0x68bce87a, 0x1b03397f |
| .long 0x62ec6c6d, 0x6956fc3b, 0xebb883bd |
| .long 0x2342001e, 0x3771e98f, 0xb3e32c28 |
| .long 0xe8b6368b, 0x2178513a, 0x064f7f26 |
| .long 0x9ef68d35, 0x170076fa, 0xdd7e3b0c |
| .long 0x0b0bf8ca, 0x6f345e45, 0xf285651c |
| .long 0x02ee03b2, 0xff0dba97, 0x10746f3c |
| .long 0x135c83fd, 0xf872e54c, 0xc7a68855 |
| .long 0x00bcf5f6, 0x86d8e4d2, 0x271d9844 |
| .long 0x58ca5f00, 0x5bb8f1bc, 0x8e766a0c |
| .long 0xded288f8, 0xb3af077a, 0x93a5f730 |
| .long 0x37170390, 0xca6ef3ac, 0x6cb08e5c |
| .long 0xf48642e9, 0xdd66cbbb, 0x6b749fb2 |
| .long 0xb25b29f2, 0xe9e28eb4, 0x1393e203 |
| .long 0x45cddf4e, 0xc9c8b782, 0xcec3662e |
| .long 0xdfd94fb2, 0x93e106a4, 0x96c515bb |
| .long 0x021ac5ef, 0xd813b325, 0xe6fc4e6a |
| .long 0x8e1450f7, 0x2342001e, 0x8227bb8a |
| .long 0xe0cdcf86, 0x6d9a4957, 0xb0cd4768 |
| .long 0x613eee91, 0xd2c3ed1a, 0x39c7ff35 |
| .long 0xbedc6ba1, 0x9ef68d35, 0xd7a4825c |
| .long 0x0cd1526a, 0xf2271e60, 0x0ab3844b |
| .long 0xd6c3a807, 0x2664fd8b, 0x0167d312 |
| .long 0x1d31175f, 0x02ee03b2, 0xf6076544 |
| .long 0x4be7fd90, 0x363bd6b3, 0x26f6a60a |
| .long 0x6eeed1c9, 0x5fabe670, 0xa741c1bf |
| .long 0xb3a6da94, 0x00bcf5f6, 0x98d8d9cb |
| .long 0x2e7d11a7, 0x17f27698, 0x49c3cc9c |
| .long 0x889774e1, 0xaa7c7ad5, 0x68bce87a |
| .long 0x8a074012, 0xded288f8, 0x57a3d037 |
| .long 0xbd0bb25f, 0x6d390dec, 0x6956fc3b |
| .long 0x3be3c09b, 0x6353c1cc, 0x42d98888 |
| .long 0x465a4eee, 0xf48642e9, 0x3771e98f |
| .long 0x2e5f3c8c, 0xdd35bc8d, 0xb42ae3d9 |
| .long 0xa52f58ec, 0x9a5ede41, 0x2178513a |
| .long 0x47972100, 0x45cddf4e, 0xe0ac139e |
| .long 0x359674f7, 0xa51b6135, 0x170076fa |
| |
| .L1: .long 0xaf449247, 0x81256527, 0xccaa009e |
| .long 0x57c54819, 0x1d9513d7, 0x81256527 |
| .long 0x3f41287a, 0x57c54819, 0xaf449247 |
| .long 0xf5e48c85, 0x910eeec1, 0x1d9513d7 |
| .long 0x1f0c2cdd, 0x9026d5b1, 0xae0b5394 |
| .long 0x71d54a59, 0xf5e48c85, 0x57c54819 |
| .long 0x1c63267b, 0xfe807bbd, 0x0cbec0ed |
| .long 0xd31343ea, 0xe95c1271, 0x910eeec1 |
| .long 0xf9d9c7ee, 0x71d54a59, 0x3f41287a |
| .long 0x9ee62949, 0xcec97417, 0x9026d5b1 |
| .long 0xa55d1514, 0xf183c71b, 0xd1df2327 |
| .long 0x21aa2b26, 0xd31343ea, 0xf5e48c85 |
| .long 0x9d842b80, 0xeea395c4, 0x3c656ced |
| .long 0xd8110ff1, 0xcd669a40, 0xfe807bbd |
| .long 0x3f9e9356, 0x9ee62949, 0x1f0c2cdd |
| .long 0x1d6708a0, 0x0c30f51d, 0xe95c1271 |
| .long 0xef82aa68, 0xdb3935ea, 0xb918a347 |
| .long 0xd14bcc9b, 0x21aa2b26, 0x71d54a59 |
| .long 0x99cce860, 0x356d209f, 0xff6f2fc2 |
| .long 0xd8af8e46, 0xc352f6de, 0xcec97417 |
| .long 0xf1996890, 0xd8110ff1, 0x1c63267b |
| .long 0x631bc508, 0xe95c7216, 0xf183c71b |
| .long 0x8511c306, 0x8e031a19, 0x9b9bdbd0 |
| .long 0xdb3839f3, 0x1d6708a0, 0xd31343ea |
| .long 0x7a92fffb, 0xf7003835, 0x4470ac44 |
| .long 0x6ce68f2a, 0x00eba0c8, 0xeea395c4 |
| .long 0x4caaa263, 0xd14bcc9b, 0xf9d9c7ee |
| .long 0xb46f7cff, 0x9a1b53c8, 0xcd669a40 |
| .long 0x60290934, 0x81b6f443, 0x6d40f445 |
| .long 0x8e976a7d, 0xd8af8e46, 0x9ee62949 |
| .long 0xdcf5088a, 0x9dbdc100, 0x145575d5 |
| .long 0x1753ab84, 0xbbf2f6d6, 0x0c30f51d |
| .long 0x255b139e, 0x631bc508, 0xa55d1514 |
| .long 0xd784eaa8, 0xce26786c, 0xdb3935ea |
| .long 0x6d2c864a, 0x8068c345, 0x2586d334 |
| .long 0x02072e24, 0xdb3839f3, 0x21aa2b26 |
| .long 0x06689b0a, 0x5efd72f5, 0xe0575528 |
| .long 0x1e52f5ea, 0x4117915b, 0x356d209f |
| .long 0x1d3d1db6, 0x6ce68f2a, 0x9d842b80 |
| .long 0x3796455c, 0xb8e0e4a8, 0xc352f6de |
| .long 0xdf3a4eb3, 0xc55a2330, 0xb84ffa9c |
| .long 0x28ae0976, 0xb46f7cff, 0xd8110ff1 |
| .long 0x9764bc8d, 0xd7e7a22c, 0x712510f0 |
| .long 0x13a13e18, 0x3e9a43cd, 0xe95c7216 |
| .long 0xb8ee242e, 0x8e976a7d, 0x3f9e9356 |
| .long 0x0c540e7b, 0x753c81ff, 0x8e031a19 |
| .long 0x9924c781, 0xb9220208, 0x3edcde65 |
| .long 0x3954de39, 0x1753ab84, 0x1d6708a0 |
| .long 0xf32238b5, 0xbec81497, 0x9e70b943 |
| .long 0xbbd2cd2c, 0x0925d861, 0xf7003835 |
| .long 0xcc401304, 0xd784eaa8, 0xef82aa68 |
| .long 0x4987e684, 0x6044fbb0, 0x00eba0c8 |
| .long 0x3aa11427, 0x18fe3b4a, 0x87441142 |
| .long 0x297aad60, 0x02072e24, 0xd14bcc9b |
| .long 0xf60c5e51, 0x6ef6f487, 0x5b7fdd0a |
| .long 0x632d78c5, 0x3fc33de4, 0x9a1b53c8 |
| .long 0x25b8822a, 0x1e52f5ea, 0x99cce860 |
| .long 0xd4fc84bc, 0x1af62fb8, 0x81b6f443 |
| .long 0x5690aa32, 0xa91fdefb, 0x688a110e |
| .long 0x1357a093, 0x3796455c, 0xd8af8e46 |
| .long 0x798fdd33, 0xaaa18a37, 0x357b9517 |
| .long 0xc2815395, 0x54d42691, 0x9dbdc100 |
| .long 0x21cfc0f7, 0x28ae0976, 0xf1996890 |
| .long 0xa0decef3, 0x7b4aa8b7, 0xbbf2f6d6 |