Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/vdso64/gettimeofday.S b/arch/ppc64/kernel/vdso64/gettimeofday.S
new file mode 100644
index 00000000000..ed3f970ff05
--- /dev/null
+++ b/arch/ppc64/kernel/vdso64/gettimeofday.S
@@ -0,0 +1,91 @@
+/*
+ * Userland implementation of gettimeofday() for 64 bits processes in a
+ * ppc64 kernel for use in the vDSO
+ *
+ * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
+ *                    IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/config.h>
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/vdso.h>
+#include <asm/offsets.h>
+
+	.text
+/*
+ * Exact prototype of gettimeofday
+ *
+ * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz);
+ *
+ */
+V_FUNCTION_BEGIN(__kernel_gettimeofday)
+  .cfi_startproc
+	mflr	r12
+  .cfi_register lr,r12
+
+	mr	r11,r3			/* r11 holds tv */
+	mr	r10,r4			/* r10 holds tz */
+	bl	V_LOCAL_FUNC(__get_datapage)		/* get data page */
+	bl	V_LOCAL_FUNC(__do_get_xsec)		/* get xsec from tb & kernel */
+	lis     r7,15			/* r7 = 1000000 = USEC_PER_SEC */
+	ori     r7,r7,16960
+	rldicl  r5,r4,44,20		/* r5 = sec = xsec / XSEC_PER_SEC */
+	rldicr  r6,r5,20,43		/* r6 = sec * XSEC_PER_SEC */
+	std	r5,TVAL64_TV_SEC(r11)	/* store sec in tv */
+	subf	r0,r6,r4		/* r0 = xsec = (xsec - r6) */
+	mulld   r0,r0,r7		/* usec = (xsec * USEC_PER_SEC) / XSEC_PER_SEC */
+	rldicl  r0,r0,44,20
+	cmpldi	cr0,r10,0		/* check if tz is NULL */
+	std	r0,TVAL64_TV_USEC(r11)	/* store usec in tv */
+	beq	1f
+	lwz	r4,CFG_TZ_MINUTEWEST(r3)/* fill tz */
+	lwz	r5,CFG_TZ_DSTTIME(r3)
+	stw	r4,TZONE_TZ_MINWEST(r10)
+	stw	r5,TZONE_TZ_DSTTIME(r10)
+1:	mtlr	r12
+	li	r3,0			/* always success */
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_gettimeofday)
+
+
+/*
+ * This is the core of gettimeofday(), it returns the xsec
+ * value in r4 and expects the datapage ptr (non clobbered)
+ * in r3. clobbers r0,r4,r5,r6,r7,r8
+*/
+V_FUNCTION_BEGIN(__do_get_xsec)
+  .cfi_startproc
+	/* check for update count & load values */
+1:	ld	r7,CFG_TB_UPDATE_COUNT(r3)
+	andi.	r0,r4,1			/* pending update ? loop */
+	bne-	1b
+	xor	r0,r4,r4		/* create dependency */
+	add	r3,r3,r0
+
+	/* Get TB & offset it */
+	mftb	r8
+	ld	r9,CFG_TB_ORIG_STAMP(r3)
+	subf	r8,r9,r8
+
+	/* Scale result */
+	ld	r5,CFG_TB_TO_XS(r3)
+	mulhdu	r8,r8,r5
+
+	/* Add stamp since epoch */
+	ld	r6,CFG_STAMP_XSEC(r3)
+	add	r4,r6,r8
+
+	xor	r0,r4,r4
+	add	r3,r3,r0
+	ld	r0,CFG_TB_UPDATE_COUNT(r3)
+        cmpld   cr0,r0,r7		/* check if updated */
+	bne-	1b
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__do_get_xsec)