1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant. 3 * 4 * Copyright (C) 2012 David S. Miller <davem@davemloft.net> 5 */ 6 7 #include <linux/linkage.h> 8 9 #define BRANCH_ALWAYS 0x10680000 10 #define NOP 0x01000000 11 #define NG_DO_PATCH(OLD, NEW) \ 12 sethi %hi(NEW), %g1; \ 13 or %g1, %lo(NEW), %g1; \ 14 sethi %hi(OLD), %g2; \ 15 or %g2, %lo(OLD), %g2; \ 16 sub %g1, %g2, %g1; \ 17 sethi %hi(BRANCH_ALWAYS), %g3; \ 18 sll %g1, 11, %g1; \ 19 srl %g1, 11 + 2, %g1; \ 20 or %g3, %lo(BRANCH_ALWAYS), %g3; \ 21 or %g3, %g1, %g3; \ 22 stw %g3, [%g2]; \ 23 sethi %hi(NOP), %g3; \ 24 or %g3, %lo(NOP), %g3; \ 25 stw %g3, [%g2 + 0x4]; \ 26 flush %g2; 27 28 .globl niagara4_patch_copyops 29 .type niagara4_patch_copyops,#function 30 niagara4_patch_copyops: 31 NG_DO_PATCH(memcpy, NG4memcpy) 32 NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user) 33 NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user) 34 retl 35 nop 36 .size niagara4_patch_copyops,.-niagara4_patch_copyops 37 38 .globl niagara4_patch_bzero 39 .type niagara4_patch_bzero,#function 40 niagara4_patch_bzero: 41 NG_DO_PATCH(memset, NG4memset) 42 NG_DO_PATCH(__bzero, NG4bzero) 43 NG_DO_PATCH(__clear_user, NGclear_user) 44 NG_DO_PATCH(tsb_init, NGtsb_init) 45 retl 46 nop 47 .size niagara4_patch_bzero,.-niagara4_patch_bzero 48 49 .globl niagara4_patch_pageops 50 .type niagara4_patch_pageops,#function 51 niagara4_patch_pageops: 52 NG_DO_PATCH(copy_user_page, NG4copy_user_page) 53 NG_DO_PATCH(_clear_page, NG4clear_page) 54 NG_DO_PATCH(clear_user_page, NG4clear_user_page) 55 retl 56 nop 57 .size niagara4_patch_pageops,.-niagara4_patch_pageops 58 59 ENTRY(niagara4_patch_fls) 60 NG_DO_PATCH(fls, NG4fls) 61 NG_DO_PATCH(__fls, __NG4fls) 62 retl 63 nop 64 ENDPROC(niagara4_patch_fls) 65