From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/vfp/entry.S | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 arch/arm/vfp/entry.S

(limited to 'arch/arm/vfp/entry.S')

diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S
new file mode 100644
index 00000000..c1a97840
--- /dev/null
+++ b/arch/arm/vfp/entry.S
@@ -0,0 +1,70 @@
+/*
+ *  linux/arch/arm/vfp/entry.S
+ *
+ *  Copyright (C) 2004 ARM Limited.
+ *  Written by Deep Blue Solutions 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.
+ *
+ * Basic entry code, called from the kernel's undefined instruction trap.
+ *  r0  = faulted instruction
+ *  r2  = faulted PC+4
+ *  r9  = successful return
+ *  r10 = thread_info structure
+ *  lr  = failure return
+ */
+#include <asm/thread_info.h>
+#include <asm/vfpmacros.h>
+#include "../kernel/entry-header.S"
+
+ENTRY(do_vfp)
+#ifdef CONFIG_PREEMPT
+	ldr	r4, [r10, #TI_PREEMPT]	@ get preempt count
+	add	r11, r4, #1		@ increment it
+	str	r11, [r10, #TI_PREEMPT]
+#endif
+	enable_irq
+	str	r2, [sp, #S_PC]		@ update regs->ARM_pc for Thumb 2 case
+ 	ldr	r4, .LCvfp
+	ldr	r11, [r10, #TI_CPU]	@ CPU number
+	add	r10, r10, #TI_VFPSTATE	@ r10 = workspace
+	ldr	pc, [r4]		@ call VFP entry point
+ENDPROC(do_vfp)
+
+ENTRY(vfp_null_entry)
+#ifdef CONFIG_PREEMPT
+	get_thread_info	r10
+	ldr	r4, [r10, #TI_PREEMPT]	@ get preempt count
+	sub	r11, r4, #1		@ decrement it
+	str	r11, [r10, #TI_PREEMPT]
+#endif
+	mov	pc, lr
+ENDPROC(vfp_null_entry)
+
+	.align	2
+.LCvfp:
+	.word	vfp_vector
+
+@ This code is called if the VFP does not exist. It needs to flag the
+@ failure to the VFP initialisation code.
+
+	__INIT
+ENTRY(vfp_testing_entry)
+#ifdef CONFIG_PREEMPT
+	get_thread_info	r10
+	ldr	r4, [r10, #TI_PREEMPT]	@ get preempt count
+	sub	r11, r4, #1		@ decrement it
+	str	r11, [r10, #TI_PREEMPT]
+#endif
+	ldr	r0, VFP_arch_address
+	str	r5, [r0]		@ known non-zero value
+	mov	pc, r9			@ we have handled the fault
+ENDPROC(vfp_testing_entry)
+
+	.align	2
+VFP_arch_address:
+	.word	VFP_arch
+
+	__FINIT
-- 
cgit v1.2.3