cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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NG4clear_page.S (682B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* NG4copy_page.S: Niagara-4 optimized clear page.
      3 *
      4 * Copyright (C) 2012 (davem@davemloft.net)
      5 */
      6
      7#include <asm/asi.h>
      8#include <asm/page.h>
      9
     10	.text
     11
     12	.register	%g3, #scratch
     13
     14	.align		32
     15	.globl		NG4clear_page
     16	.globl		NG4clear_user_page
     17NG4clear_page:		/* %o0=dest */
     18NG4clear_user_page:	/* %o0=dest, %o1=vaddr */
     19	set		PAGE_SIZE, %g7
     20	mov		0x20, %g3
     211:	stxa		%g0, [%o0 + %g0] ASI_ST_BLKINIT_MRU_P
     22	subcc		%g7, 0x40, %g7
     23	stxa		%g0, [%o0 + %g3] ASI_ST_BLKINIT_MRU_P
     24	bne,pt		%xcc, 1b
     25	 add		%o0, 0x40, %o0
     26	membar		#StoreLoad|#StoreStore
     27	retl
     28	 nop
     29	.size		NG4clear_page,.-NG4clear_page
     30	.size		NG4clear_user_page,.-NG4clear_user_page