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Commit 280a5ba2 authored by Michael Neuling's avatar Michael Neuling Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: Improve stream generation comments in copypage/user 



No code changes, just documenting what's happening a little better.

Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent a515348f

arch/powerpc/lib/copypage_power7.S

+11 −8
Original line number Diff line number Diff line
@@ -28,13 +28,14 @@ _GLOBAL(copypage_power7) 
	 * aligned we don't need to clear the bottom 7 bits of either

	 * address.

	 */

	ori	r9,r3,1		/* stream=1 */

	ori	r9,r3,1		/* stream=1 => to */



#ifdef CONFIG_PPC_64K_PAGES

	lis	r7,0x0E01	/* depth=7, units=512 */

	lis	r7,0x0E01	/* depth=7

				 * units/cachelines=512 */

#else

	lis	r7,0x0E00	/* depth=7 */

	ori	r7,r7,0x1000	/* units=32 */

	ori	r7,r7,0x1000	/* units/cachelines=32 */

#endif

	ori	r10,r7,1	/* stream=1 */
@@ -43,12 +44,14 @@ _GLOBAL(copypage_power7) 


.machine push

.machine "power4"

	dcbt	r0,r4,0b01000

	dcbt	r0,r7,0b01010

	dcbtst	r0,r9,0b01000

	dcbtst	r0,r10,0b01010

	/* setup read stream 0  */

	dcbt	r0,r4,0b01000  	/* addr from */

	dcbt	r0,r7,0b01010   /* length and depth from */

	/* setup write stream 1 */

	dcbtst	r0,r9,0b01000   /* addr to */

	dcbtst	r0,r10,0b01010  /* length and depth to */

	eieio

	dcbt	r0,r8,0b01010	/* GO */

	dcbt	r0,r8,0b01010	/* all streams GO */

.machine pop



#ifdef CONFIG_ALTIVEC

arch/powerpc/lib/copyuser_power7.S

+7 −5
Original line number Diff line number Diff line
@@ -318,12 +318,14 @@ err1; stb r0,0(r3) 


.machine push

.machine "power4"

	dcbt	r0,r6,0b01000

	dcbt	r0,r7,0b01010

	dcbtst	r0,r9,0b01000

	dcbtst	r0,r10,0b01010

	/* setup read stream 0 */

	dcbt	r0,r6,0b01000   /* addr from */

	dcbt	r0,r7,0b01010   /* length and depth from */

	/* setup write stream 1 */

	dcbtst	r0,r9,0b01000   /* addr to */

	dcbtst	r0,r10,0b01010  /* length and depth to */

	eieio

	dcbt	r0,r8,0b01010	/* GO */

	dcbt	r0,r8,0b01010	/* all streams GO */

.machine pop



	beq	cr1,.Lunwind_stack_nonvmx_copy