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/* SPDX-License-Identifier: GPL-2.0 */ /* GENpage.S: Generic clear and copy page. * * Copyright (C) 2007 (davem@davemloft.net) */ #include <asm/page.h> .text .align 32 GENcopy_user_page: set PAGE_SIZE, %g7 1: ldx [%o1 + 0x00], %o2 ldx [%o1 + 0x08], %o3 ldx [%o1 + 0x10], %o4 ldx [%o1 + 0x18], %o5 stx %o2, [%o0 + 0x00] stx %o3, [%o0 + 0x08] stx %o4, [%o0 + 0x10] stx %o5, [%o0 + 0x18] ldx [%o1 + 0x20], %o2 ldx [%o1 + 0x28], %o3 ldx [%o1 + 0x30], %o4 ldx [%o1 + 0x38], %o5 stx %o2, [%o0 + 0x20] stx %o3, [%o0 + 0x28] stx %o4, [%o0 + 0x30] stx %o5, [%o0 + 0x38] subcc %g7, 64, %g7 add %o1, 64, %o1 bne,pt %xcc, 1b add %o0, 64, %o0 retl nop GENclear_page: GENclear_user_page: set PAGE_SIZE, %g7 1: stx %g0, [%o0 + 0x00] stx %g0, [%o0 + 0x08] stx %g0, [%o0 + 0x10] stx %g0, [%o0 + 0x18] stx %g0, [%o0 + 0x20] stx %g0, [%o0 + 0x28] stx %g0, [%o0 + 0x30] stx %g0, [%o0 + 0x38] subcc %g7, 64, %g7 bne,pt %xcc, 1b add %o0, 64, %o0 #define BRANCH_ALWAYS 0x10680000 #define NOP 0x01000000 #define GEN_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 generic_patch_pageops .type generic_patch_pageops,#function generic_patch_pageops: GEN_DO_PATCH(copy_user_page, GENcopy_user_page) GEN_DO_PATCH(_clear_page, GENclear_page) GEN_DO_PATCH(clear_user_page, GENclear_user_page) retl nop .size generic_patch_pageops,.-generic_patch_pageops |