![Anton Blanchard](/assets/img/avatar_default.png)
The enable_kernel_*() functions leave the relevant MSR bits enabled until we exit the kernel sometime later. Create disable versions that wrap the kernel use of FP, Altivec VSX or SPE. While we don't want to disable it normally for performance reasons (MSR writes are slow), it will be used for a debug boot option that does this and catches bad uses in other areas of the kernel. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
212 lines
5 KiB
C
212 lines
5 KiB
C
/*
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* Glue code for SHA-1 implementation for SPE instructions (PPC)
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*
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* Based on generic implementation.
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*
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* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <crypto/sha.h>
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#include <asm/byteorder.h>
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#include <asm/switch_to.h>
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#include <linux/hardirq.h>
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/*
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* MAX_BYTES defines the number of bytes that are allowed to be processed
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* between preempt_disable() and preempt_enable(). SHA1 takes ~1000
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* operations per 64 bytes. e500 cores can issue two arithmetic instructions
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* per clock cycle using one 32/64 bit unit (SU1) and one 32 bit unit (SU2).
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* Thus 2KB of input data will need an estimated maximum of 18,000 cycles.
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* Headroom for cache misses included. Even with the low end model clocked
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* at 667 MHz this equals to a critical time window of less than 27us.
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*
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*/
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#define MAX_BYTES 2048
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extern void ppc_spe_sha1_transform(u32 *state, const u8 *src, u32 blocks);
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static void spe_begin(void)
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{
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/* We just start SPE operations and will save SPE registers later. */
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preempt_disable();
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enable_kernel_spe();
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}
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static void spe_end(void)
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{
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disable_kernel_spe();
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/* reenable preemption */
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preempt_enable();
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}
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static inline void ppc_sha1_clear_context(struct sha1_state *sctx)
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{
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int count = sizeof(struct sha1_state) >> 2;
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u32 *ptr = (u32 *)sctx;
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/* make sure we can clear the fast way */
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BUILD_BUG_ON(sizeof(struct sha1_state) % 4);
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do { *ptr++ = 0; } while (--count);
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}
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static int ppc_spe_sha1_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA1_H0;
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sctx->state[1] = SHA1_H1;
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sctx->state[2] = SHA1_H2;
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sctx->state[3] = SHA1_H3;
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sctx->state[4] = SHA1_H4;
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sctx->count = 0;
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return 0;
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}
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static int ppc_spe_sha1_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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const unsigned int offset = sctx->count & 0x3f;
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const unsigned int avail = 64 - offset;
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unsigned int bytes;
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const u8 *src = data;
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if (avail > len) {
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sctx->count += len;
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memcpy((char *)sctx->buffer + offset, src, len);
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return 0;
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}
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sctx->count += len;
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if (offset) {
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memcpy((char *)sctx->buffer + offset, src, avail);
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spe_begin();
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ppc_spe_sha1_transform(sctx->state, (const u8 *)sctx->buffer, 1);
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spe_end();
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len -= avail;
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src += avail;
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}
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while (len > 63) {
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bytes = (len > MAX_BYTES) ? MAX_BYTES : len;
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bytes = bytes & ~0x3f;
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spe_begin();
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ppc_spe_sha1_transform(sctx->state, src, bytes >> 6);
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spe_end();
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src += bytes;
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len -= bytes;
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};
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memcpy((char *)sctx->buffer, src, len);
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return 0;
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}
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static int ppc_spe_sha1_final(struct shash_desc *desc, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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const unsigned int offset = sctx->count & 0x3f;
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char *p = (char *)sctx->buffer + offset;
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int padlen;
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__be64 *pbits = (__be64 *)(((char *)&sctx->buffer) + 56);
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__be32 *dst = (__be32 *)out;
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padlen = 55 - offset;
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*p++ = 0x80;
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spe_begin();
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if (padlen < 0) {
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memset(p, 0x00, padlen + sizeof (u64));
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ppc_spe_sha1_transform(sctx->state, sctx->buffer, 1);
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p = (char *)sctx->buffer;
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padlen = 56;
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}
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memset(p, 0, padlen);
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*pbits = cpu_to_be64(sctx->count << 3);
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ppc_spe_sha1_transform(sctx->state, sctx->buffer, 1);
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spe_end();
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dst[0] = cpu_to_be32(sctx->state[0]);
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dst[1] = cpu_to_be32(sctx->state[1]);
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dst[2] = cpu_to_be32(sctx->state[2]);
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dst[3] = cpu_to_be32(sctx->state[3]);
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dst[4] = cpu_to_be32(sctx->state[4]);
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ppc_sha1_clear_context(sctx);
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return 0;
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}
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static int ppc_spe_sha1_export(struct shash_desc *desc, void *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int ppc_spe_sha1_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = SHA1_DIGEST_SIZE,
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.init = ppc_spe_sha1_init,
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.update = ppc_spe_sha1_update,
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.final = ppc_spe_sha1_final,
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.export = ppc_spe_sha1_export,
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.import = ppc_spe_sha1_import,
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.descsize = sizeof(struct sha1_state),
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name= "sha1-ppc-spe",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init ppc_spe_sha1_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit ppc_spe_sha1_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(ppc_spe_sha1_mod_init);
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module_exit(ppc_spe_sha1_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, SPE optimized");
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MODULE_ALIAS_CRYPTO("sha1");
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MODULE_ALIAS_CRYPTO("sha1-ppc-spe");
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