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Commit 0837f524 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Partially unroll the SH-4 __flush_xxx_region() flushers. 



This does a bit of unrolling for the SH-4 region flushers.

Based on an earlier patch by SUGIOKA Toshinobu.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 81742527

arch/sh/mm/flush-sh4.c

+83 −21
Original line number Diff line number Diff line
@@ -10,16 +10,37 @@ 
 */

void __weak __flush_wback_region(void *start, int size)

{

	unsigned long v;

	unsigned long begin, end;

	unsigned long v, cnt, end;



	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	v = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

		& ~(L1_CACHE_BYTES-1);

	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

		asm volatile("ocbwb	%0"

			     : /* no output */

			     : "m" (__m(v)));

	cnt = (end - v) / L1_CACHE_BYTES;



	while (cnt >= 8) {

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt -= 8;

	}



	while (cnt) {

		asm volatile("ocbwb	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt--;

	}

}
@@ -31,16 +52,36 @@ void __weak __flush_wback_region(void *start, int size) 
 */

void __weak __flush_purge_region(void *start, int size)

{

	unsigned long v;

	unsigned long begin, end;

	unsigned long v, cnt, end;



	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	v = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

		& ~(L1_CACHE_BYTES-1);

	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

		asm volatile("ocbp	%0"

			     : /* no output */

			     : "m" (__m(v)));

	cnt = (end - v) / L1_CACHE_BYTES;



	while (cnt >= 8) {

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt -= 8;

	}

	while (cnt) {

		asm volatile("ocbp	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt--;

	}

}
@@ -49,15 +90,36 @@ void __weak __flush_purge_region(void *start, int size) 
 */

void __weak __flush_invalidate_region(void *start, int size)

{

	unsigned long v;

	unsigned long begin, end;

	unsigned long v, cnt, end;



	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	v = (unsigned long)start & ~(L1_CACHE_BYTES-1);

	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

		& ~(L1_CACHE_BYTES-1);

	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

		asm volatile("ocbi	%0"

			     : /* no output */

			     : "m" (__m(v)));

	cnt = (end - v) / L1_CACHE_BYTES;



	while (cnt >= 8) {

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt -= 8;

	}



	while (cnt) {

		asm volatile("ocbi	@%0" : : "r" (v));

		v += L1_CACHE_BYTES;

		cnt--;

	}

}