| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 18 Mar 2009 21:30:52 +0100
From: monstr@...str.eu
To: linux-kernel@...r.kernel.org
Cc: john.williams@...alogix.com, Michal Simek <monstr@...str.eu>
Subject: [PATCH 25/57] microblaze_v7: delay.h, timex.h
From: Michal Simek <monstr@...str.eu>
Signed-off-by: Michal Simek <monstr@...str.eu>
---
arch/microblaze/include/asm/delay.h | 72 +++++++++++++++++++++++++++++++++++
arch/microblaze/include/asm/timex.h | 18 +++++++++
2 files changed, 90 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/include/asm/delay.h
create mode 100644 arch/microblaze/include/asm/timex.h
diff --git a/arch/microblaze/include/asm/delay.h b/arch/microblaze/include/asm/delay.h
new file mode 100644
index 0000000..05b7d39
--- /dev/null
+++ b/arch/microblaze/include/asm/delay.h
@@ -0,0 +1,72 @@
+/*
+ * include/asm-microblaze/delay.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Michal Simek
+ * Copyright (C) 2007 John Williams
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#ifndef _ASM_MICROBLAZE_DELAY_H
+#define _ASM_MICROBLAZE_DELAY_H
+
+extern inline void __delay(unsigned long loops)
+{
+ asm volatile ("# __delay \n\t" \
+ "1: addi %0, %0, -1\t\n" \
+ "bneid %0, 1b \t\n" \
+ "nop \t\n"
+ : "=r" (loops)
+ : "0" (loops));
+}
+
+/*
+ * Note that 19 * 226 == 4294 ==~ 2^32 / 10^6, so
+ * loops = (4294 * usecs * loops_per_jiffy * HZ) / 2^32.
+ *
+ * The mul instruction gives us loops = (a * b) / 2^32.
+ * We choose a = usecs * 19 * HZ and b = loops_per_jiffy * 226
+ * because this lets us support a wide range of HZ and
+ * loops_per_jiffy values without either a or b overflowing 2^32.
+ * Thus we need usecs * HZ <= (2^32 - 1) / 19 = 226050910 and
+ * loops_per_jiffy <= (2^32 - 1) / 226 = 19004280
+ * (which corresponds to ~3800 bogomips at HZ = 100).
+ * -- paulus
+ */
+#define __MAX_UDELAY (226050910UL/HZ) /* maximum udelay argument */
+#define __MAX_NDELAY (4294967295UL/HZ) /* maximum ndelay argument */
+
+extern unsigned long loops_per_jiffy;
+
+extern inline void __udelay(unsigned int x)
+{
+
+ unsigned long long tmp =
+ (unsigned long long)x * (unsigned long long)loops_per_jiffy \
+ * 226LL;
+ unsigned loops = tmp >> 32;
+
+/*
+ __asm__("mulxuu %0,%1,%2" : "=r" (loops) :
+ "r" (x), "r" (loops_per_jiffy * 226));
+*/
+ __delay(loops);
+}
+
+extern void __bad_udelay(void); /* deliberately undefined */
+extern void __bad_ndelay(void); /* deliberately undefined */
+
+#define udelay(n) (__builtin_constant_p(n) ? \
+ ((n) > __MAX_UDELAY ? __bad_udelay() : __udelay((n) * (19 * HZ))) : \
+ __udelay((n) * (19 * HZ)))
+
+#define ndelay(n) (__builtin_constant_p(n) ? \
+ ((n) > __MAX_NDELAY ? __bad_ndelay() : __udelay((n) * HZ)) : \
+ __udelay((n) * HZ))
+
+#define muldiv(a, b, c) (((a)*(b))/(c))
+
+#endif /* _ASM_MICROBLAZE_DELAY_H */
diff --git a/arch/microblaze/include/asm/timex.h b/arch/microblaze/include/asm/timex.h
new file mode 100644
index 0000000..678525d
--- /dev/null
+++ b/arch/microblaze/include/asm/timex.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_TIMEX_H
+#define _ASM_MICROBLAZE_TIMEX_H
+
+#define CLOCK_TICK_RATE 1000 /* Timer input freq. */
+
+typedef unsigned long cycles_t;
+
+#define get_cycles() (0)
+
+#endif /* _ASM_TIMEX_H */
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists