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authorSam Ravnborg <sam@ravnborg.org>2008-12-03 14:10:25 +0300
committerDavid S. Miller <davem@davemloft.net>2008-12-04 20:17:19 +0300
commit478b8fecda511942404ac232897a718cecd13e48 (patch)
treee022fce8ca92f93a000e1cd686255f0b126e9fd5 /arch/sparc/lib/NGpage.S
parent18269c0fd4db9bec2668f895f21d742486ccb90f (diff)
downloadlinux-478b8fecda511942404ac232897a718cecd13e48.tar.xz
sparc,sparc64: unify lib/
o Renamed files in sparc64 to <name>_64.S when identical to sparc32 files. o iomap.c were equal for sparc32 and sparc64 o adjusted sparc/Makefile now we have only one lib/ Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/lib/NGpage.S')
-rw-r--r--arch/sparc/lib/NGpage.S99
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/sparc/lib/NGpage.S b/arch/sparc/lib/NGpage.S
new file mode 100644
index 000000000000..428920de05ba
--- /dev/null
+++ b/arch/sparc/lib/NGpage.S
@@ -0,0 +1,99 @@
+/* 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
+ membar #Sync
+ retl
+ nop
+
+ .globl NGclear_page, NGclear_user_page
+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
+ 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