/* SPDX-License-Identifier: GPL-2.0 */
/* NGpage.S: Niagara optimize clear and copy page.
 *
 * Copyright (C) 2006 (davem@davemloft.net)
 */

#include <asm/asi.h>
#include <asm/page.h>

        .text
        .align  32

        /* This is heavily simplified from the sun4u variants
         * because Niagara does not have any D-cache aliasing issues
         * and also we don't need to use the FPU in order to implement
         * an optimal page copy/clear.
         */

NGcopy_user_page:       /* %o0=dest, %o1=src, %o2=vaddr */
        save            %sp, -192, %sp
        rd              %asi, %g3
        wr              %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
        set             PAGE_SIZE, %g7
        prefetch        [%i1 + 0x00], #one_read
        prefetch        [%i1 + 0x40], #one_read

1:      prefetch        [%i1 + 0x80], #one_read
        prefetch        [%i1 + 0xc0], #one_read
        ldda            [%i1 + 0x00] %asi, %o2
        ldda            [%i1 + 0x10] %asi, %o4
        ldda            [%i1 + 0x20] %asi, %l2
        ldda            [%i1 + 0x30] %asi, %l4
        stxa            %o2, [%i0 + 0x00] %asi
        stxa            %o3, [%i0 + 0x08] %asi
        stxa            %o4, [%i0 + 0x10] %asi
        stxa            %o5, [%i0 + 0x18] %asi
        stxa            %l2, [%i0 + 0x20] %asi
        stxa            %l3, [%i0 + 0x28] %asi
        stxa            %l4, [%i0 + 0x30] %asi
        stxa            %l5, [%i0 + 0x38] %asi
        ldda            [%i1 + 0x40] %asi, %o2
        ldda            [%i1 + 0x50] %asi, %o4
        ldda            [%i1 + 0x60] %asi, %l2
        ldda            [%i1 + 0x70] %asi, %l4
        stxa            %o2, [%i0 + 0x40] %asi
        stxa            %o3, [%i0 + 0x48] %asi
        stxa            %o4, [%i0 + 0x50] %asi
        stxa            %o5, [%i0 + 0x58] %asi
        stxa            %l2, [%i0 + 0x60] %asi
        stxa            %l3, [%i0 + 0x68] %asi
        stxa            %l4, [%i0 + 0x70] %asi
        stxa            %l5, [%i0 + 0x78] %asi
        add             %i1, 128, %i1
        subcc           %g7, 128, %g7
        bne,pt          %xcc, 1b
         add            %i0, 128, %i0
        wr              %g3, 0x0, %asi
        membar          #Sync
        ret
         restore

        .align          32
        .globl          NGclear_page
        .globl          NGclear_user_page
NGclear_page:           /* %o0=dest */
NGclear_user_page:      /* %o0=dest, %o1=vaddr */
        rd              %asi, %g3
        wr              %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
        set             PAGE_SIZE, %g7

1:      stxa            %g0, [%o0 + 0x00] %asi
        stxa            %g0, [%o0 + 0x08] %asi
        stxa            %g0, [%o0 + 0x10] %asi
        stxa            %g0, [%o0 + 0x18] %asi
        stxa            %g0, [%o0 + 0x20] %asi
        stxa            %g0, [%o0 + 0x28] %asi
        stxa            %g0, [%o0 + 0x30] %asi
        stxa            %g0, [%o0 + 0x38] %asi
        stxa            %g0, [%o0 + 0x40] %asi
        stxa            %g0, [%o0 + 0x48] %asi
        stxa            %g0, [%o0 + 0x50] %asi
        stxa            %g0, [%o0 + 0x58] %asi
        stxa            %g0, [%o0 + 0x60] %asi
        stxa            %g0, [%o0 + 0x68] %asi
        stxa            %g0, [%o0 + 0x70] %asi
        stxa            %g0, [%o0 + 0x78] %asi
        stxa            %g0, [%o0 + 0x80] %asi
        stxa            %g0, [%o0 + 0x88] %asi
        stxa            %g0, [%o0 + 0x90] %asi
        stxa            %g0, [%o0 + 0x98] %asi
        stxa            %g0, [%o0 + 0xa0] %asi
        stxa            %g0, [%o0 + 0xa8] %asi
        stxa            %g0, [%o0 + 0xb0] %asi
        stxa            %g0, [%o0 + 0xb8] %asi
        stxa            %g0, [%o0 + 0xc0] %asi
        stxa            %g0, [%o0 + 0xc8] %asi
        stxa            %g0, [%o0 + 0xd0] %asi
        stxa            %g0, [%o0 + 0xd8] %asi
        stxa            %g0, [%o0 + 0xe0] %asi
        stxa            %g0, [%o0 + 0xe8] %asi
        stxa            %g0, [%o0 + 0xf0] %asi
        stxa            %g0, [%o0 + 0xf8] %asi
        subcc           %g7, 256, %g7
        bne,pt          %xcc, 1b
         add            %o0, 256, %o0
        wr              %g3, 0x0, %asi
        membar          #Sync
        retl
         nop

#define BRANCH_ALWAYS   0x10680000
#define NOP             0x01000000
#define NG_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  niagara_patch_pageops
        .type   niagara_patch_pageops,#function
niagara_patch_pageops:
        NG_DO_PATCH(copy_user_page, NGcopy_user_page)
        NG_DO_PATCH(_clear_page, NGclear_page)
        NG_DO_PATCH(clear_user_page, NGclear_user_page)
        retl
         nop
        .size   niagara_patch_pageops,.-niagara_patch_pageops