--- /dev/null
+/*
+ * Fast AES implementation for SPE instruction set (PPC)
+ *
+ * This code makes use of the SPE SIMD instruction set as defined in
+ * http://cache.freescale.com/files/32bit/doc/ref_manual/SPEPIM.pdf
+ * Implementation is based on optimization guide notes from
+ * http://cache.freescale.com/files/32bit/doc/app_note/AN2665.pdf
+ *
+ * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <asm/ppc_asm.h>
+#include "aes-spe-regs.h"
+
+#define EAD(in, bpos) \
+ rlwimi rT0,in,28-((bpos+3)%4)*8,20,27;
+
+#define DAD(in, bpos) \
+ rlwimi rT1,in,24-((bpos+3)%4)*8,24,31;
+
+#define LWH(out, off) \
+ evlwwsplat out,off(rT0); /* load word high */
+
+#define LWL(out, off) \
+ lwz out,off(rT0); /* load word low */
+
+#define LBZ(out, tab, off) \
+ lbz out,off(tab); /* load byte */
+
+#define LAH(out, in, bpos, off) \
+ EAD(in, bpos) /* calc addr + load word high */ \
+ LWH(out, off)
+
+#define LAL(out, in, bpos, off) \
+ EAD(in, bpos) /* calc addr + load word low */ \
+ LWL(out, off)
+
+#define LAE(out, in, bpos) \
+ EAD(in, bpos) /* calc addr + load enc byte */ \
+ LBZ(out, rT0, 8)
+
+#define LBE(out) \
+ LBZ(out, rT0, 8) /* load enc byte */
+
+#define LAD(out, in, bpos) \
+ DAD(in, bpos) /* calc addr + load dec byte */ \
+ LBZ(out, rT1, 0)
+
+#define LBD(out) \
+ LBZ(out, rT1, 0)
+
+/*
+ * ppc_encrypt_block: The central encryption function for a single 16 bytes
+ * block. It does no stack handling or register saving to support fast calls
+ * via bl/blr. It expects that caller has pre-xored input data with first
+ * 4 words of encryption key into rD0-rD3. Pointer/counter registers must
+ * have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
+ * and rW0-rW3 and caller must execute a final xor on the ouput registers.
+ * All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
+ *
+ */
+_GLOBAL(ppc_encrypt_block)
+ LAH(rW4, rD1, 2, 4)
+ LAH(rW6, rD0, 3, 0)
+ LAH(rW3, rD0, 1, 8)
+ppc_encrypt_block_loop:
+ LAH(rW0, rD3, 0, 12)
+ LAL(rW0, rD0, 0, 12)
+ LAH(rW1, rD1, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAL(rW3, rD1, 1, 8)
+ LAL(rW4, rD2, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAH(rW5, rD3, 2, 4)
+ LAL(rW5, rD0, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ evldw rD1,16(rKP)
+ EAD(rD3, 3)
+ evxor rW2,rW2,rW4
+ LWL(rW7, 0)
+ evxor rW2,rW2,rW6
+ EAD(rD2, 0)
+ evxor rD1,rD1,rW2
+ LWL(rW1, 12)
+ evxor rD1,rD1,rW0
+ evldw rD3,24(rKP)
+ evmergehi rD0,rD0,rD1
+ EAD(rD1, 2)
+ evxor rW3,rW3,rW5
+ LWH(rW4, 4)
+ evxor rW3,rW3,rW7
+ EAD(rD0, 3)
+ evxor rD3,rD3,rW3
+ LWH(rW6, 0)
+ evxor rD3,rD3,rW1
+ EAD(rD0, 1)
+ evmergehi rD2,rD2,rD3
+ LWH(rW3, 8)
+ LAH(rW0, rD3, 0, 12)
+ LAL(rW0, rD0, 0, 12)
+ LAH(rW1, rD1, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAL(rW3, rD1, 1, 8)
+ LAL(rW4, rD2, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAH(rW5, rD3, 2, 4)
+ LAL(rW5, rD0, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ evldw rD1,32(rKP)
+ EAD(rD3, 3)
+ evxor rW2,rW2,rW4
+ LWL(rW7, 0)
+ evxor rW2,rW2,rW6
+ EAD(rD2, 0)
+ evxor rD1,rD1,rW2
+ LWL(rW1, 12)
+ evxor rD1,rD1,rW0
+ evldw rD3,40(rKP)
+ evmergehi rD0,rD0,rD1
+ EAD(rD1, 2)
+ evxor rW3,rW3,rW5
+ LWH(rW4, 4)
+ evxor rW3,rW3,rW7
+ EAD(rD0, 3)
+ evxor rD3,rD3,rW3
+ LWH(rW6, 0)
+ evxor rD3,rD3,rW1
+ EAD(rD0, 1)
+ evmergehi rD2,rD2,rD3
+ LWH(rW3, 8)
+ addi rKP,rKP,32
+ bdnz ppc_encrypt_block_loop
+ LAH(rW0, rD3, 0, 12)
+ LAL(rW0, rD0, 0, 12)
+ LAH(rW1, rD1, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAL(rW3, rD1, 1, 8)
+ LAL(rW4, rD2, 2, 4)
+ LAH(rW5, rD3, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAL(rW5, rD0, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ evldw rD1,16(rKP)
+ EAD(rD3, 3)
+ evxor rW2,rW2,rW4
+ LWL(rW7, 0)
+ evxor rW2,rW2,rW6
+ EAD(rD2, 0)
+ evxor rD1,rD1,rW2
+ LWL(rW1, 12)
+ evxor rD1,rD1,rW0
+ evldw rD3,24(rKP)
+ evmergehi rD0,rD0,rD1
+ EAD(rD1, 0)
+ evxor rW3,rW3,rW5
+ LBE(rW2)
+ evxor rW3,rW3,rW7
+ EAD(rD0, 1)
+ evxor rD3,rD3,rW3
+ LBE(rW6)
+ evxor rD3,rD3,rW1
+ EAD(rD0, 0)
+ evmergehi rD2,rD2,rD3
+ LBE(rW1)
+ LAE(rW0, rD3, 0)
+ LAE(rW1, rD0, 0)
+ LAE(rW4, rD2, 1)
+ LAE(rW5, rD3, 1)
+ LAE(rW3, rD2, 0)
+ LAE(rW7, rD1, 1)
+ rlwimi rW0,rW4,8,16,23
+ rlwimi rW1,rW5,8,16,23
+ LAE(rW4, rD1, 2)
+ LAE(rW5, rD2, 2)
+ rlwimi rW2,rW6,8,16,23
+ rlwimi rW3,rW7,8,16,23
+ LAE(rW6, rD3, 2)
+ LAE(rW7, rD0, 2)
+ rlwimi rW0,rW4,16,8,15
+ rlwimi rW1,rW5,16,8,15
+ LAE(rW4, rD0, 3)
+ LAE(rW5, rD1, 3)
+ rlwimi rW2,rW6,16,8,15
+ lwz rD0,32(rKP)
+ rlwimi rW3,rW7,16,8,15
+ lwz rD1,36(rKP)
+ LAE(rW6, rD2, 3)
+ LAE(rW7, rD3, 3)
+ rlwimi rW0,rW4,24,0,7
+ lwz rD2,40(rKP)
+ rlwimi rW1,rW5,24,0,7
+ lwz rD3,44(rKP)
+ rlwimi rW2,rW6,24,0,7
+ rlwimi rW3,rW7,24,0,7
+ blr
+
+/*
+ * ppc_decrypt_block: The central decryption function for a single 16 bytes
+ * block. It does no stack handling or register saving to support fast calls
+ * via bl/blr. It expects that caller has pre-xored input data with first
+ * 4 words of encryption key into rD0-rD3. Pointer/counter registers must
+ * have also been set up before (rT0, rKP, CTR). Output is stored in rD0-rD3
+ * and rW0-rW3 and caller must execute a final xor on the ouput registers.
+ * All working registers rD0-rD3 & rW0-rW7 are overwritten during processing.
+ *
+ */
+_GLOBAL(ppc_decrypt_block)
+ LAH(rW0, rD1, 0, 12)
+ LAH(rW6, rD0, 3, 0)
+ LAH(rW3, rD0, 1, 8)
+ppc_decrypt_block_loop:
+ LAH(rW1, rD3, 0, 12)
+ LAL(rW0, rD2, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAH(rW4, rD3, 2, 4)
+ LAL(rW4, rD0, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAH(rW5, rD1, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ LAL(rW7, rD3, 3, 0)
+ LAL(rW3, rD1, 1, 8)
+ evldw rD1,16(rKP)
+ EAD(rD0, 0)
+ evxor rW4,rW4,rW6
+ LWL(rW1, 12)
+ evxor rW0,rW0,rW4
+ EAD(rD2, 2)
+ evxor rW0,rW0,rW2
+ LWL(rW5, 4)
+ evxor rD1,rD1,rW0
+ evldw rD3,24(rKP)
+ evmergehi rD0,rD0,rD1
+ EAD(rD1, 0)
+ evxor rW3,rW3,rW7
+ LWH(rW0, 12)
+ evxor rW3,rW3,rW1
+ EAD(rD0, 3)
+ evxor rD3,rD3,rW3
+ LWH(rW6, 0)
+ evxor rD3,rD3,rW5
+ EAD(rD0, 1)
+ evmergehi rD2,rD2,rD3
+ LWH(rW3, 8)
+ LAH(rW1, rD3, 0, 12)
+ LAL(rW0, rD2, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAH(rW4, rD3, 2, 4)
+ LAL(rW4, rD0, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAH(rW5, rD1, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ LAL(rW7, rD3, 3, 0)
+ LAL(rW3, rD1, 1, 8)
+ evldw rD1,32(rKP)
+ EAD(rD0, 0)
+ evxor rW4,rW4,rW6
+ LWL(rW1, 12)
+ evxor rW0,rW0,rW4
+ EAD(rD2, 2)
+ evxor rW0,rW0,rW2
+ LWL(rW5, 4)
+ evxor rD1,rD1,rW0
+ evldw rD3,40(rKP)
+ evmergehi rD0,rD0,rD1
+ EAD(rD1, 0)
+ evxor rW3,rW3,rW7
+ LWH(rW0, 12)
+ evxor rW3,rW3,rW1
+ EAD(rD0, 3)
+ evxor rD3,rD3,rW3
+ LWH(rW6, 0)
+ evxor rD3,rD3,rW5
+ EAD(rD0, 1)
+ evmergehi rD2,rD2,rD3
+ LWH(rW3, 8)
+ addi rKP,rKP,32
+ bdnz ppc_decrypt_block_loop
+ LAH(rW1, rD3, 0, 12)
+ LAL(rW0, rD2, 0, 12)
+ LAH(rW2, rD2, 1, 8)
+ LAL(rW2, rD3, 1, 8)
+ LAH(rW4, rD3, 2, 4)
+ LAL(rW4, rD0, 2, 4)
+ LAL(rW6, rD1, 3, 0)
+ LAH(rW5, rD1, 2, 4)
+ LAH(rW7, rD2, 3, 0)
+ LAL(rW7, rD3, 3, 0)
+ LAL(rW3, rD1, 1, 8)
+ evldw rD1,16(rKP)
+ EAD(rD0, 0)
+ evxor rW4,rW4,rW6
+ LWL(rW1, 12)
+ evxor rW0,rW0,rW4
+ EAD(rD2, 2)
+ evxor rW0,rW0,rW2
+ LWL(rW5, 4)
+ evxor rD1,rD1,rW0
+ evldw rD3,24(rKP)
+ evmergehi rD0,rD0,rD1
+ DAD(rD1, 0)
+ evxor rW3,rW3,rW7
+ LBD(rW0)
+ evxor rW3,rW3,rW1
+ DAD(rD0, 1)
+ evxor rD3,rD3,rW3
+ LBD(rW6)
+ evxor rD3,rD3,rW5
+ DAD(rD0, 0)
+ evmergehi rD2,rD2,rD3
+ LBD(rW3)
+ LAD(rW2, rD3, 0)
+ LAD(rW1, rD2, 0)
+ LAD(rW4, rD2, 1)
+ LAD(rW5, rD3, 1)
+ LAD(rW7, rD1, 1)
+ rlwimi rW0,rW4,8,16,23
+ rlwimi rW1,rW5,8,16,23
+ LAD(rW4, rD3, 2)
+ LAD(rW5, rD0, 2)
+ rlwimi rW2,rW6,8,16,23
+ rlwimi rW3,rW7,8,16,23
+ LAD(rW6, rD1, 2)
+ LAD(rW7, rD2, 2)
+ rlwimi rW0,rW4,16,8,15
+ rlwimi rW1,rW5,16,8,15
+ LAD(rW4, rD0, 3)
+ LAD(rW5, rD1, 3)
+ rlwimi rW2,rW6,16,8,15
+ lwz rD0,32(rKP)
+ rlwimi rW3,rW7,16,8,15
+ lwz rD1,36(rKP)
+ LAD(rW6, rD2, 3)
+ LAD(rW7, rD3, 3)
+ rlwimi rW0,rW4,24,0,7
+ lwz rD2,40(rKP)
+ rlwimi rW1,rW5,24,0,7
+ lwz rD3,44(rKP)
+ rlwimi rW2,rW6,24,0,7
+ rlwimi rW3,rW7,24,0,7
+ blr
projects / platform / kernel / linux-rpi.git / commitdiff