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authorMarc Zyngier <marc.zyngier@arm.com>2012-03-05 11:49:33 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2012-09-17 13:42:18 +0100
commitf27bb139c3876806a2c82e979d2dbbece44c66df (patch)
treeb89925966ca77224f0605dc85521a2e55ab89c70 /arch/arm64/lib
parent030896885ade0a17c8638e1ede8d3ca7099f0302 (diff)
downloadlinux-f27bb139c3876806a2c82e979d2dbbece44c66df.tar.gz
arm64: Miscellaneous library functions
This patch adds udelay, memory and bit operations together with the ksyms exports. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm64/lib')
-rw-r--r--arch/arm64/lib/Makefile4
-rw-r--r--arch/arm64/lib/bitops.c25
-rw-r--r--arch/arm64/lib/clear_page.S39
-rw-r--r--arch/arm64/lib/copy_page.S46
-rw-r--r--arch/arm64/lib/delay.c55
5 files changed, 169 insertions, 0 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
new file mode 100644
index 00000000000..2fb7f6092aa
--- /dev/null
+++ b/arch/arm64/lib/Makefile
@@ -0,0 +1,4 @@
+lib-y := bitops.o delay.o \
+ strncpy_from_user.o strnlen_user.o clear_user.o \
+ copy_from_user.o copy_to_user.o copy_in_user.o \
+ copy_page.o clear_page.o
diff --git a/arch/arm64/lib/bitops.c b/arch/arm64/lib/bitops.c
new file mode 100644
index 00000000000..aa4965e60ac
--- /dev/null
+++ b/arch/arm64/lib/bitops.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2012 ARM Limited
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SMP
+arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
+ [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED
+};
+#endif
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S
new file mode 100644
index 00000000000..ef08e905e35
--- /dev/null
+++ b/arch/arm64/lib/clear_page.S
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+
+/*
+ * Clear page @dest
+ *
+ * Parameters:
+ * x0 - dest
+ */
+ENTRY(clear_page)
+ mrs x1, dczid_el0
+ and w1, w1, #0xf
+ mov x2, #4
+ lsl x1, x2, x1
+
+1: dc zva, x0
+ add x0, x0, x1
+ tst x0, #(PAGE_SIZE - 1)
+ b.ne 1b
+ ret
+ENDPROC(clear_page)
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S
new file mode 100644
index 00000000000..512b9a7b980
--- /dev/null
+++ b/arch/arm64/lib/copy_page.S
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+
+/*
+ * Copy a page from src to dest (both are page aligned)
+ *
+ * Parameters:
+ * x0 - dest
+ * x1 - src
+ */
+ENTRY(copy_page)
+ /* Assume cache line size is 64 bytes. */
+ prfm pldl1strm, [x1, #64]
+1: ldp x2, x3, [x1]
+ ldp x4, x5, [x1, #16]
+ ldp x6, x7, [x1, #32]
+ ldp x8, x9, [x1, #48]
+ add x1, x1, #64
+ prfm pldl1strm, [x1, #64]
+ stnp x2, x3, [x0]
+ stnp x4, x5, [x0, #16]
+ stnp x6, x7, [x0, #32]
+ stnp x8, x9, [x0, #48]
+ add x0, x0, #64
+ tst x1, #(PAGE_SIZE - 1)
+ b.ne 1b
+ ret
+ENDPROC(copy_page)
diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c
new file mode 100644
index 00000000000..dad4ec9bbfd
--- /dev/null
+++ b/arch/arm64/lib/delay.c
@@ -0,0 +1,55 @@
+/*
+ * Delay loops based on the OpenRISC implementation.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/timex.h>
+
+void __delay(unsigned long cycles)
+{
+ cycles_t start = get_cycles();
+
+ while ((get_cycles() - start) < cycles)
+ cpu_relax();
+}
+EXPORT_SYMBOL(__delay);
+
+inline void __const_udelay(unsigned long xloops)
+{
+ unsigned long loops;
+
+ loops = xloops * loops_per_jiffy * HZ;
+ __delay(loops >> 32);
+}
+EXPORT_SYMBOL(__const_udelay);
+
+void __udelay(unsigned long usecs)
+{
+ __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
+}
+EXPORT_SYMBOL(__udelay);
+
+void __ndelay(unsigned long nsecs)
+{
+ __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
+}
+EXPORT_SYMBOL(__ndelay);