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ARM: crypto: add NEON accelerated XOR implementation

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Add a source file xor-neon.c (which is really just the reference
C implementation passed through the GCC vectorizer) and hook it
up to the XOR framework.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
This commit is contained in:
Ard Biesheuvel
2013-05-17 18:51:23 +02:00
parent 73c132c15d
commit 01956597cb
3 changed files with 121 additions and 0 deletions
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73
arch/arm/include/asm/xor.h
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@@ -7,7 +7,10 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/hardirq.h>
#include <asm-generic/xor.h>
#include <asm/hwcap.h>
#include <asm/neon.h>
#define __XOR(a1, a2) a1 ^= a2
@@ -138,4 +141,74 @@ static struct xor_block_template xor_block_arm4regs = {
xor_speed(&xor_block_arm4regs); \
xor_speed(&xor_block_8regs); \
xor_speed(&xor_block_32regs); \
NEON_TEMPLATES; \
} while (0)
#ifdef CONFIG_KERNEL_MODE_NEON
extern struct xor_block_template const xor_block_neon_inner;
static void
xor_neon_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
if (in_interrupt()) {
xor_arm4regs_2(bytes, p1, p2);
} else {
kernel_neon_begin();
xor_block_neon_inner.do_2(bytes, p1, p2);
kernel_neon_end();
}
}
static void
xor_neon_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3)
{
if (in_interrupt()) {
xor_arm4regs_3(bytes, p1, p2, p3);
} else {
kernel_neon_begin();
xor_block_neon_inner.do_3(bytes, p1, p2, p3);
kernel_neon_end();
}
}
static void
xor_neon_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4)
{
if (in_interrupt()) {
xor_arm4regs_4(bytes, p1, p2, p3, p4);
} else {
kernel_neon_begin();
xor_block_neon_inner.do_4(bytes, p1, p2, p3, p4);
kernel_neon_end();
}
}
static void
xor_neon_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4, unsigned long *p5)
{
if (in_interrupt()) {
xor_arm4regs_5(bytes, p1, p2, p3, p4, p5);
} else {
kernel_neon_begin();
xor_block_neon_inner.do_5(bytes, p1, p2, p3, p4, p5);
kernel_neon_end();
}
}
static struct xor_block_template xor_block_neon = {
.name = "neon",
.do_2 = xor_neon_2,
.do_3 = xor_neon_3,
.do_4 = xor_neon_4,
.do_5 = xor_neon_5
};
#define NEON_TEMPLATES \
do { if (cpu_has_neon()) xor_speed(&xor_block_neon); } while (0)
#else
#define NEON_TEMPLATES
#endif