[SPARC64]: Niagara optimized memset/bzero/clear_user.

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

diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 3222c82..8c6c469 100644 (file)
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -420,6 +420,8 @@ niagara_tlb_fixup:
        /* Patch copy/clear ops.  */
        call    niagara_patch_copyops
         nop
+       call    niagara_patch_bzero
+        nop
        call    niagara_patch_pageops
         nop
 

diff --git a/arch/sparc64/lib/Makefile b/arch/sparc64/lib/Makefile
index 3d0e9a2..8812ded 100644 (file)
--- a/arch/sparc64/lib/Makefile
+++ b/arch/sparc64/lib/Makefile
@@ -12,7 +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 \
+        NGpage.o NGbzero.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/NGbzero.S b/arch/sparc64/lib/NGbzero.S
new file mode 100644 (file)
index 0000000..fef584f
--- /dev/null
+++ b/arch/sparc64/lib/NGbzero.S
@@ -0,0 +1,162 @@
+/* NGbzero.S: Niagara optimized memset/clear_user.
+ *
+ * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ */
+#include <asm/asi.h>
+
+#define EX_ST(x,y)             \
+98:    x,y;                    \
+       .section .fixup;        \
+       .align 4;               \
+99:    retl;                   \
+        mov    %o1, %o0;       \
+       .section __ex_table;    \
+       .align 4;               \
+       .word 98b, 99b;         \
+       .text;                  \
+       .align 4;
+
+       .text
+
+       .globl          NGmemset
+       .type           NGmemset, #function
+NGmemset:              /* %o0=buf, %o1=pat, %o2=len */
+       and             %o1, 0xff, %o3
+       mov             %o2, %o1
+       sllx            %o3, 8, %g1
+       or              %g1, %o3, %o2
+       sllx            %o2, 16, %g1
+       or              %g1, %o2, %o2
+       sllx            %o2, 32, %g1
+       ba,pt           %xcc, 1f
+        or             %g1, %o2, %o2
+
+       .globl          NGbzero
+       .type           NGbzero, #function
+NGbzero:
+       clr             %o2
+1:     brz,pn          %o1, NGbzero_return
+        mov            %o0, %o3
+
+       /* %o5: saved %asi, restored at NGbzero_done
+        * %g7: store-init %asi to use
+        * %o4: non-store-init %asi to use
+        */
+       rd              %asi, %o5
+       mov             ASI_BLK_INIT_QUAD_LDD_P, %g7
+       mov             ASI_P, %o4
+       wr              %o4, 0x0, %asi
+
+NGbzero_from_clear_user:
+       cmp             %o1, 15
+       bl,pn           %icc, NGbzero_tiny
+        andcc          %o0, 0x7, %g1
+       be,pt           %xcc, 2f
+        mov            8, %g2
+       sub             %g2, %g1, %g1
+       sub             %o1, %g1, %o1
+1:     EX_ST(stba %o2, [%o0 + 0x00] %asi)
+       subcc           %g1, 1, %g1
+       bne,pt          %xcc, 1b
+        add            %o0, 1, %o0
+2:     cmp             %o1, 128
+       bl,pn           %icc, NGbzero_medium
+        andcc          %o0, (64 - 1), %g1
+       be,pt           %xcc, NGbzero_pre_loop
+        mov            64, %g2
+       sub             %g2, %g1, %g1
+       sub             %o1, %g1, %o1
+1:     EX_ST(stxa %o2, [%o0 + 0x00] %asi)
+       subcc           %g1, 8, %g1
+       bne,pt          %xcc, 1b
+        add            %o0, 8, %o0
+
+NGbzero_pre_loop:
+       wr              %g7, 0x0, %asi
+       andn            %o1, (64 - 1), %g1
+       sub             %o1, %g1, %o1
+NGbzero_loop:
+       EX_ST(stxa %o2, [%o0 + 0x00] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x08] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x10] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x18] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x20] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x28] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x30] %asi)
+       EX_ST(stxa %o2, [%o0 + 0x38] %asi)
+       subcc           %g1, 64, %g1
+       bne,pt          %xcc, NGbzero_loop
+        add            %o0, 64, %o0
+
+       wr              %o4, 0x0, %asi
+       brz,pn          %o1, NGbzero_done
+NGbzero_medium:
+        andncc         %o1, 0x7, %g1
+       be,pn           %xcc, 2f
+        sub            %o1, %g1, %o1
+1:     EX_ST(stxa %o2, [%o0 + 0x00] %asi)
+       subcc           %g1, 8, %g1
+       bne,pt          %xcc, 1b
+        add            %o0, 8, %o0
+2:     brz,pt          %o1, NGbzero_done
+        nop
+
+NGbzero_tiny:
+1:     EX_ST(stba %o2, [%o0 + 0x00] %asi)
+       subcc           %o1, 1, %o1
+       bne,pt          %icc, 1b
+        add            %o0, 1, %o0
+
+       /* fallthrough */
+
+NGbzero_done:
+       wr              %o5, 0x0, %asi
+
+NGbzero_return:
+       retl
+        mov            %o3, %o0
+       .size           NGbzero, .-NGbzero
+       .size           NGmemset, .-NGmemset
+
+       .globl          NGclear_user
+       .type           NGclear_user, #function
+NGclear_user:          /* %o0=buf, %o1=len */
+       rd              %asi, %o5
+       brz,pn          %o1, NGbzero_done
+        clr            %o3
+       cmp             %o5, ASI_AIUS
+       bne,pn          %icc, NGbzero
+        clr            %o2
+       mov             ASI_BLK_INIT_QUAD_LDD_AIUS, %g7
+       ba,pt           %xcc, NGbzero_from_clear_user
+        mov            ASI_AIUS, %o4
+       .size           NGclear_user, .-NGclear_user
+
+#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_bzero
+       .type   niagara_patch_bzero,#function
+niagara_patch_bzero:
+       NG_DO_PATCH(memset, NGmemset)
+       NG_DO_PATCH(__bzero, NGbzero)
+       NG_DO_PATCH(__clear_user, NGclear_user)
+       retl
+        nop
+       .size   niagara_patch_bzero,.-niagara_patch_bzero