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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
|
|
