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Date: Sun, 19 Jun 2011 13:43:43 +0200
From: Jonas Bonn <jonas@...thpole.se>
To: linux-kernel@...r.kernel.org
Cc: Jonas Bonn <jonas@...thpole.se>
Subject: [PATCH 17/19] OpenRISC: Library routines
Signed-off-by: Jonas Bonn <jonas@...thpole.se>
---
arch/openrisc/lib/delay.c | 72 ++++++++++++++++
arch/openrisc/lib/string.S | 204 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 276 insertions(+), 0 deletions(-)
create mode 100644 arch/openrisc/lib/delay.c
create mode 100644 arch/openrisc/lib/string.S
diff --git a/arch/openrisc/lib/delay.c b/arch/openrisc/lib/delay.c
new file mode 100644
index 0000000..8fc07f0
--- /dev/null
+++ b/arch/openrisc/lib/delay.c
@@ -0,0 +1,72 @@
+/*
+ * OpenRISC delay.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@...mi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@...thpole.se>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation
+ *
+ * Precise Delay Loops
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/timex.h>
+#include <linux/param.h>
+#include <linux/types.h>
+#include <linux/init.h>
+
+#include <asm/processor.h>
+#include <asm/system.h>
+
+int __devinit read_current_timer(unsigned long *timer_value)
+{
+ u32 v = mfspr(SPR_TTCR);
+// printk("timer value = %d\n", v);
+ *timer_value = v;
+// *timer_value = mfspr(SPR_TTCR);
+ return 0;
+}
+
+/*FIXME: move things from delay.h to this file */
+
+/*
+void __delay(unsigned long loops)
+{
+ unsigned bclock, now;
+
+ bclock = mfspr(SPR_TTCR);
+ do {
+ now = mfspr(SPR_TTCR);
+ } while ((now - bclock) < loops);
+}
+*/
+/*
+inline void __const_udelay(unsigned long xloops)
+{
+ unsigned long long loops;
+
+ asm("mulu.d %0, %1, %2"
+ : "=r"(loops)
+ : "r"(current_cpu_data.loops_per_jiffy * HZ), "r"(xloops));
+ __delay(loops >> 32);
+}
+*/
+
+
+//void __udelay(unsigned long usecs)
+//{
+// __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
+//}
+
+//void __ndelay(unsigned long nsecs)
+//{
+// __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
+//}
diff --git a/arch/openrisc/lib/string.S b/arch/openrisc/lib/string.S
new file mode 100644
index 0000000..465f04b
--- /dev/null
+++ b/arch/openrisc/lib/string.S
@@ -0,0 +1,204 @@
+/*
+ * OpenRISC string.S
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@...mi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@...thpole.se>
+ *
+ * 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/linkage.h>
+#include <asm/errno.h>
+
+ /*
+ * this can be optimized by doing gcc inline assemlby with
+ * proper constraints (no need to save args registers...)
+ *
+ */
+
+
+/*
+ *
+ * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
+ *
+ * NOTE: it returns number of bytes NOT copied !!!
+ *
+ */
+ .global __copy_tofrom_user
+__copy_tofrom_user:
+ l.addi r1,r1,-12
+ l.sw 0(r1),r6
+ l.sw 4(r1),r4
+ l.sw 8(r1),r3
+
+ l.addi r11,r5,0
+2: l.sfeq r11,r0
+ l.bf 1f
+ l.addi r11,r11,-1
+8: l.lbz r6,0(r4)
+9: l.sb 0(r3),r6
+ l.addi r3,r3,1
+ l.j 2b
+ l.addi r4,r4,1
+1:
+ l.addi r11,r11,1 // r11 holds the return value
+
+ l.lwz r6,0(r1)
+ l.lwz r4,4(r1)
+ l.lwz r3,8(r1)
+ l.jr r9
+ l.addi r1,r1,12
+
+ .section .fixup, "ax"
+99:
+ l.j 1b
+ l.nop
+ .previous
+
+ .section __ex_table, "a"
+ .long 8b, 99b // read fault
+ .long 9b, 99b // write fault
+ .previous
+
+/*
+ * unsigned long clear_user(void *addr, unsigned long size) ;
+ *
+ * NOTE: it returns number of bytes NOT cleared !!!
+ */
+ .global __clear_user
+__clear_user:
+ l.addi r1,r1,-8
+ l.sw 0(r1),r4
+ l.sw 4(r1),r3
+
+2: l.sfeq r4,r0
+ l.bf 1f
+ l.addi r4,r4,-1
+9: l.sb 0(r3),r0
+ l.j 2b
+ l.addi r3,r3,1
+
+1:
+ l.addi r11,r4,1
+
+ l.lwz r4,0(r1)
+ l.lwz r3,4(r1)
+ l.jr r9
+ l.addi r1,r1,8
+
+ .section .fixup, "ax"
+99:
+ l.j 1b
+ l.nop
+ .previous
+
+ .section __ex_table, "a"
+ .long 9b, 99b // write fault
+ .previous
+
+/*
+ * long strncpy_from_user(char *dst, const char *src, long count)
+ *
+ *
+ */
+ .global __strncpy_from_user
+__strncpy_from_user:
+ l.addi r1,r1,-16
+ l.sw 0(r1),r6
+ l.sw 4(r1),r5
+ l.sw 8(r1),r4
+ l.sw 12(r1),r3
+
+ l.addi r11,r5,0
+2: l.sfeq r5,r0
+ l.bf 1f
+ l.addi r5,r5,-1
+8: l.lbz r6,0(r4)
+ l.sfeq r6,r0
+ l.bf 1f
+9: l.sb 0(r3),r6
+ l.addi r3,r3,1
+ l.j 2b
+ l.addi r4,r4,1
+1:
+ l.lwz r6,0(r1)
+ l.addi r5,r5,1
+ l.sub r11,r11,r5 // r11 holds the return value
+
+ l.lwz r6,0(r1)
+ l.lwz r5,4(r1)
+ l.lwz r4,8(r1)
+ l.lwz r3,12(r1)
+ l.jr r9
+ l.addi r1,r1,16
+
+ .section .fixup, "ax"
+99:
+ l.movhi r11,hi(-EFAULT)
+ l.ori r11,r11,lo(-EFAULT)
+
+ l.lwz r6,0(r1)
+ l.lwz r5,4(r1)
+ l.lwz r4,8(r1)
+ l.lwz r3,12(r1)
+ l.jr r9
+ l.addi r1,r1,16
+ .previous
+
+ .section __ex_table, "a"
+ .long 8b, 99b // read fault
+ .previous
+
+/*
+ * extern int __strnlen_user(const char *str, long len, unsigned long top);
+ *
+ *
+ * RTRN: - length of a string including NUL termination character
+ * - on page fault 0
+ */
+
+ .global __strnlen_user
+__strnlen_user:
+ l.addi r1,r1,-8
+ l.sw 0(r1),r6
+ l.sw 4(r1),r3
+
+ l.addi r11,r0,0
+2: l.sfeq r11,r4
+ l.bf 1f
+ l.addi r11,r11,1
+8: l.lbz r6,0(r3)
+ l.sfeq r6,r0
+ l.bf 1f
+ l.sfgeu r3,r5 // are we over the top ?
+ l.bf 99f
+ l.j 2b
+ l.addi r3,r3,1
+
+1:
+ l.lwz r6,0(r1)
+ l.lwz r3,4(r1)
+ l.jr r9
+ l.addi r1,r1,8
+
+ .section .fixup, "ax"
+99:
+ l.addi r11,r0,0
+
+ l.lwz r6,0(r1)
+ l.lwz r3,4(r1)
+ l.jr r9
+ l.addi r1,r1,8
+ .previous
+
+ .section __ex_table, "a"
+ .long 8b, 99b // read fault
+ .previous
--
1.7.4.1
--
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