/* NG2page.S: Niagara-2 optimized clear and copy page. * * Copyright (C) 2007 (davem@davemloft.net) */ #include <asm/asi.h> #include <asm/page.h> #include <asm/visasm.h> .text .align 32 /* This is heavily simplified from the sun4u variants * because Niagara-2 does not have any D-cache aliasing issues. */ NG2copy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */ prefetch [%o1 + 0x00], #one_read prefetch [%o1 + 0x40], #one_read VISEntryHalf set PAGE_SIZE, %g7 sub %o0, %o1, %g3 1: stxa %g0, [%o1 + %g3] ASI_BLK_INIT_QUAD_LDD_P subcc %g7, 64, %g7 ldda [%o1] ASI_BLK_P, %f0 stda %f0, [%o1 + %g3] ASI_BLK_P add %o1, 64, %o1 bne,pt %xcc, 1b prefetch [%o1 + 0x40], #one_read membar #Sync VISExitHalf retl nop #define BRANCH_ALWAYS 0x10680000 #define NOP 0x01000000 #define NG_DO_PATCH(OLD, NEW) \ sethi %hi(NEW), %g1; \ or %g1, %lo(NEW), %g1; \ sethi %hi(OLD), %g2; \ or %g2, %lo(OLD), %g2; \ sub %g1, %g2, %g1; \ sethi %hi(BRANCH_ALWAYS), %g3; \ sll %g1, 11, %g1; \ srl %g1, 11 + 2, %g1; \ or %g3, %lo(BRANCH_ALWAYS), %g3; \ or %g3, %g1, %g3; \ stw %g3, [%g2]; \ sethi %hi(NOP), %g3; \ or %g3, %lo(NOP), %g3; \ stw %g3, [%g2 + 0x4]; \ flush %g2; .globl niagara2_patch_pageops .type niagara2_patch_pageops,#function niagara2_patch_pageops: NG_DO_PATCH(copy_user_page, NG2copy_user_page) NG_DO_PATCH(_clear_page, NGclear_page) NG_DO_PATCH(clear_user_page, NGclear_user_page) retl nop .size niagara2_patch_pageops,.-niagara2_patch_pageops