Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / xtensa / kernel / mxhead.S

diff --git a/kernel/arch/xtensa/kernel/mxhead.S b/kernel/arch/xtensa/kernel/mxhead.S
new file mode 100644 (file)
index 0000000..77a161a
--- /dev/null
+++ b/kernel/arch/xtensa/kernel/mxhead.S
@@ -0,0 +1,85 @@
+/*
+ * Xtensa Secondary Processors startup code.
+ *
+ * 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) 2001 - 2013 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com>
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Pete Delaney <piet@tensilica.com>
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/cacheasm.h>
+#include <asm/initialize_mmu.h>
+#include <asm/mxregs.h>
+#include <asm/regs.h>
+
+
+       .section .SecondaryResetVector.text, "ax"
+
+
+ENTRY(_SecondaryResetVector)
+       _j _SetupOCD
+
+       .begin  no-absolute-literals
+       .literal_position
+
+_SetupOCD:
+       /*
+        * Initialize WB, WS, and clear PS.EXCM (to allow loop instructions).
+        * Set Interrupt Level just below XCHAL_DEBUGLEVEL to allow
+        * xt-gdb to single step via DEBUG exceptions received directly
+        * by ocd.
+        */
+       movi    a1, 1
+       movi    a0, 0
+       wsr     a1, windowstart
+       wsr     a0, windowbase
+       rsync
+
+       movi    a1, LOCKLEVEL
+       wsr     a1, ps
+       rsync
+
+_SetupMMU:
+       Offset = _SetupMMU - _SecondaryResetVector
+
+#ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+       initialize_mmu
+#endif
+
+       /*
+        * Start Secondary Processors with NULL pointer to boot params.
+        */
+       movi    a2, 0                           #  a2 == NULL
+       movi    a3, _startup
+       jx      a3
+
+       .end    no-absolute-literals
+
+
+       .section        .SecondaryResetVector.remapped_text, "ax"
+       .global         _RemappedSecondaryResetVector
+
+       .org 0                                  # Need to do org before literals
+
+_RemappedSecondaryResetVector:
+       .begin  no-absolute-literals
+       .literal_position
+
+       _j      _RemappedSetupMMU
+       . = _RemappedSecondaryResetVector + Offset
+
+_RemappedSetupMMU:
+
+#ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+       initialize_mmu
+#endif
+
+       .end    no-absolute-literals