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78 lines
1.7 KiB
78 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* GENpage.S: Generic clear and copy page. |
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* |
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* Copyright (C) 2007 (davem@davemloft.net) |
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*/ |
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#include <asm/page.h> |
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.text |
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.align 32 |
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GENcopy_user_page: |
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set PAGE_SIZE, %g7 |
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1: ldx [%o1 + 0x00], %o2 |
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ldx [%o1 + 0x08], %o3 |
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ldx [%o1 + 0x10], %o4 |
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ldx [%o1 + 0x18], %o5 |
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stx %o2, [%o0 + 0x00] |
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stx %o3, [%o0 + 0x08] |
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stx %o4, [%o0 + 0x10] |
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stx %o5, [%o0 + 0x18] |
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ldx [%o1 + 0x20], %o2 |
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ldx [%o1 + 0x28], %o3 |
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ldx [%o1 + 0x30], %o4 |
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ldx [%o1 + 0x38], %o5 |
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stx %o2, [%o0 + 0x20] |
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stx %o3, [%o0 + 0x28] |
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stx %o4, [%o0 + 0x30] |
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stx %o5, [%o0 + 0x38] |
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subcc %g7, 64, %g7 |
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add %o1, 64, %o1 |
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bne,pt %xcc, 1b |
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add %o0, 64, %o0 |
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retl |
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nop |
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GENclear_page: |
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GENclear_user_page: |
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set PAGE_SIZE, %g7 |
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1: stx %g0, [%o0 + 0x00] |
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stx %g0, [%o0 + 0x08] |
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stx %g0, [%o0 + 0x10] |
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stx %g0, [%o0 + 0x18] |
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stx %g0, [%o0 + 0x20] |
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stx %g0, [%o0 + 0x28] |
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stx %g0, [%o0 + 0x30] |
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stx %g0, [%o0 + 0x38] |
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subcc %g7, 64, %g7 |
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bne,pt %xcc, 1b |
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add %o0, 64, %o0 |
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#define BRANCH_ALWAYS 0x10680000 |
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#define NOP 0x01000000 |
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#define GEN_DO_PATCH(OLD, NEW) \ |
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sethi %hi(NEW), %g1; \ |
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or %g1, %lo(NEW), %g1; \ |
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sethi %hi(OLD), %g2; \ |
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or %g2, %lo(OLD), %g2; \ |
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sub %g1, %g2, %g1; \ |
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sethi %hi(BRANCH_ALWAYS), %g3; \ |
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sll %g1, 11, %g1; \ |
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srl %g1, 11 + 2, %g1; \ |
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or %g3, %lo(BRANCH_ALWAYS), %g3; \ |
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or %g3, %g1, %g3; \ |
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stw %g3, [%g2]; \ |
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sethi %hi(NOP), %g3; \ |
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or %g3, %lo(NOP), %g3; \ |
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stw %g3, [%g2 + 0x4]; \ |
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flush %g2; |
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.globl generic_patch_pageops |
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.type generic_patch_pageops,#function |
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generic_patch_pageops: |
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GEN_DO_PATCH(copy_user_page, GENcopy_user_page) |
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GEN_DO_PATCH(_clear_page, GENclear_page) |
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GEN_DO_PATCH(clear_user_page, GENclear_user_page) |
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retl |
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nop |
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.size generic_patch_pageops,.-generic_patch_pageops
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