Initial Hostboot Runtime image support.

RTC: 76675
Change-Id: Ibd21cf5b555e6dcee182a2f1a292b47d4f384ba0
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/6127
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/src/runtime/rt_start.S b/src/runtime/rt_start.S
new file mode 100644
index 000000000..cea710b57
--- /dev/null
+++ b/src/runtime/rt_start.S
@@ -0,0 +1,72 @@
+# IBM_PROLOG_BEGIN_TAG
+# This is an automatically generated prolog.
+#
+# $Source: src/runtime/rt_start.S $
+#
+# IBM CONFIDENTIAL
+#
+# COPYRIGHT International Business Machines Corp. 2013
+#
+# p1
+#
+# Object Code Only (OCO) source materials
+# Licensed Internal Code Source Materials
+# IBM HostBoot Licensed Internal Code
+#
+# The source code for this program is not published or otherwise
+# divested of its trade secrets, irrespective of what has been
+# deposited with the U.S. Copyright Office.
+#
+# Origin: 30
+#
+# IBM_PROLOG_END_TAG
+.include "kernel/ppcconsts.S"
+
+.section .text.intvects
+
+.org 0x100;
+_init:
+    mflr r10                  # Save LR
+    bl 1f                     # Get current address by branch-with-link.
+1:
+    mflr r4                   # Extract current address.
+    mtlr r10                  # Restore LR.
+    clrrdi r4, r4, 12         # Align address to 4k.
+
+    addi r10, r4, 0x2000      # Find VFS_LAST_ADDRESS symbol.
+    ld r10, 0(r10)            # Read start of relocation table.
+    add r10, r10, r4
+
+    ld r8, 0(r10)             # Get count of relocations.
+
+    cmpi cr0, r8, 0           # Perform relocations (if any).
+    beq 2f
+    mtctr r8
+1:
+    ldu r8, 8(r10)            # Get relocation destination
+    add r8, r8, r4
+    ld r7, 0(r8)              # Get relocation address
+    add r7, r7, r4
+    std r7, 0(r8)             # Update relocation address.
+    bdnz 1b                   # Decrement CTR and continue loop.
+2:
+    addi r10, r4, 0x2008      # Find pointer to main TOC.
+    ld r10, 0(r10)            # Dereference pointer to get TOC entry.
+    ld r2, 8(r10)
+    ld r10, 0(r10)
+    mtctr r10
+    bctr
+
+.section .text.kernelasm # @2000
+.global VFS_LAST_ADDRESS
+VFS_LAST_ADDRESS:
+    .space 8
+main_toc_ptr:
+    .quad _main
+
+
+.section .data
+
+.global hbi_ImageId
+hbi_ImageId:
+    .space 128