sparc/lib/NG4patch.S

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.
0003  *
0004  * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
0005  */
0006
0007 #include <linux/linkage.h>
0008
0009 #define BRANCH_ALWAYS   0x10680000
0010 #define NOP     0x01000000
0011 #define NG_DO_PATCH(OLD, NEW)   \
0012     sethi   %hi(NEW), %g1; \
0013     or  %g1, %lo(NEW), %g1; \
0014     sethi   %hi(OLD), %g2; \
0015     or  %g2, %lo(OLD), %g2; \
0016     sub %g1, %g2, %g1; \
0017     sethi   %hi(BRANCH_ALWAYS), %g3; \
0018     sll %g1, 11, %g1; \
0019     srl %g1, 11 + 2, %g1; \
0020     or  %g3, %lo(BRANCH_ALWAYS), %g3; \
0021     or  %g3, %g1, %g3; \
0022     stw %g3, [%g2]; \
0023     sethi   %hi(NOP), %g3; \
0024     or  %g3, %lo(NOP), %g3; \
0025     stw %g3, [%g2 + 0x4]; \
0026     flush   %g2;
0027
0028     .globl  niagara4_patch_copyops
0029     .type   niagara4_patch_copyops,#function
0030 niagara4_patch_copyops:
0031     NG_DO_PATCH(memcpy, NG4memcpy)
0032     NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)
0033     NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)
0034     retl
0035      nop
0036     .size   niagara4_patch_copyops,.-niagara4_patch_copyops
0037
0038     .globl  niagara4_patch_bzero
0039     .type   niagara4_patch_bzero,#function
0040 niagara4_patch_bzero:
0041     NG_DO_PATCH(memset, NG4memset)
0042     NG_DO_PATCH(__bzero, NG4bzero)
0043     NG_DO_PATCH(__clear_user, NGclear_user)
0044     NG_DO_PATCH(tsb_init, NGtsb_init)
0045     retl
0046      nop
0047     .size   niagara4_patch_bzero,.-niagara4_patch_bzero
0048
0049     .globl  niagara4_patch_pageops
0050     .type   niagara4_patch_pageops,#function
0051 niagara4_patch_pageops:
0052     NG_DO_PATCH(copy_user_page, NG4copy_user_page)
0053     NG_DO_PATCH(_clear_page, NG4clear_page)
0054     NG_DO_PATCH(clear_user_page, NG4clear_user_page)
0055     retl
0056      nop
0057     .size   niagara4_patch_pageops,.-niagara4_patch_pageops
0058
0059 ENTRY(niagara4_patch_fls)
0060     NG_DO_PATCH(fls, NG4fls)
0061     NG_DO_PATCH(__fls, __NG4fls)
0062     retl
0063      nop
0064 ENDPROC(niagara4_patch_fls)