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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
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