[SPARC64]: Niagara copy/clear page.

Happily we have no D-cache aliasing issues on these
chips, so the implementation is very straightforward.

Add a stub in bootup which will be where the patching
calls will be made for niagara/sun4v/hypervisor.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 96 insertions, 0 deletions

diff --git a/arch/sparc64/lib/Makefile b/arch/sparc64/lib/Makefile
index 813f622b5c4e..3d0e9a24d7a3 100644
--- a/arch/sparc64/lib/Makefile
+++ b/arch/sparc64/lib/Makefile
@@ -12,6 +12,7 @@ lib-y := PeeCeeI.o copy_page.o clear_page.o strlen.o strncmp.o \
          U1memcpy.o U1copy_from_user.o U1copy_to_user.o \
          U3memcpy.o U3copy_from_user.o U3copy_to_user.o U3patch.o \
          NGmemcpy.o NGcopy_from_user.o NGcopy_to_user.o NGpatch.o \
+         NGpage.o \
          copy_in_user.o user_fixup.o memmove.o \
          mcount.o ipcsum.o rwsem.o xor.o find_bit.o delay.o
 
diff --git a/arch/sparc64/lib/NGpage.S b/arch/sparc64/lib/NGpage.S
new file mode 100644
index 000000000000..0e6152c28b01
--- /dev/null
+++ b/arch/sparc64/lib/NGpage.S
@@ -0,0 +1,95 @@
+/* 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 */
+        prefetch        [%o1 + 0x00], #one_read
+        mov             8, %g1
+        mov             16, %g2
+        mov             24, %g3
+        set             PAGE_SIZE, %g7
+
+1:      ldda            [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
+        ldda            [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
+        prefetch        [%o1 + 0x40], #one_read
+        add             %o1, 32, %o1
+        stxa            %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
+        ldda            [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
+        stxa            %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
+        ldda            [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
+        add             %o1, 32, %o1
+        add             %o0, 32, %o0
+        stxa            %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
+        subcc           %g7, 64, %g7
+        bne,pt          %xcc, 1b
+         add            %o0, 32, %o0
+        retl
+         nop
+
+NGclear_page:           /* %o0=dest */
+NGclear_user_page:      /* %o0=dest, %o1=vaddr */
+        mov             8, %g1
+        mov             16, %g2
+        mov             24, %g3
+        set             PAGE_SIZE, %g7
+
+1:      stxa            %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
+        add             %o0, 32, %o0
+        stxa            %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
+        stxa            %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
+        subcc           %g7, 64, %g7
+        bne,pt          %xcc, 1b
+         add            %o0, 32, %o0
+        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; \
+        srl     %g1, 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