1 /* NGpage.S: Niagara optimize clear and copy page.
3 * Copyright (C) 2006 (davem@davemloft.net)
12 /* This is heavily simplified from the sun4u variants
13 * because Niagara does not have any D-cache aliasing issues
14 * and also we don't need to use the FPU in order to implement
15 * an optimal page copy/clear.
18 NGcopy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */
19 prefetch [%o1 + 0x00], #one_read
25 1: ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
26 ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
27 prefetch [%o1 + 0x40], #one_read
29 stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
30 stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
31 ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
32 stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
33 stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
34 ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
37 stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
38 stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
39 stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
40 stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
48 NGclear_page: /* %o0=dest */
49 NGclear_user_page: /* %o0=dest, %o1=vaddr */
55 1: stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
56 stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
57 stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
58 stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
60 stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
61 stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
62 stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
63 stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
71 #define BRANCH_ALWAYS 0x10680000
72 #define NOP 0x01000000
73 #define NG_DO_PATCH(OLD, NEW) \
74 sethi %hi(NEW), %g1; \
75 or %g1, %lo(NEW), %g1; \
76 sethi %hi(OLD), %g2; \
77 or %g2, %lo(OLD), %g2; \
79 sethi %hi(BRANCH_ALWAYS), %g3; \
81 srl %g1, 11 + 2, %g1; \
82 or %g3, %lo(BRANCH_ALWAYS), %g3; \
85 sethi %hi(NOP), %g3; \
86 or %g3, %lo(NOP), %g3; \
87 stw %g3, [%g2 + 0x4]; \
90 .globl niagara_patch_pageops
91 .type niagara_patch_pageops,#function
92 niagara_patch_pageops:
93 NG_DO_PATCH(copy_user_page, NGcopy_user_page)
94 NG_DO_PATCH(_clear_page, NGclear_page)
95 NG_DO_PATCH(clear_user_page, NGclear_user_page)
98 .size niagara_patch_pageops,.-niagara_patch_pageops