SLOF: Support PAPR NVRAM RTAS callsqemu-slof-20121018

BenH still need to ACK this though.

From: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>

* Determines size of the flash using device tree.
* Provides nvram access functions for RTAS_NVRAM
* Allocates temporary buffer of nvram in SLOF code and use that in C.
  (sbrk not available)
* NVRAM_LENGTH is used at various places, make sure it is well guarded
  and also use dynamically determined size once an RTAS-NVRAM is
  found.
* Use NVRAM_LENGTH as a variable in case of RTAS_NVRAM, not very
  elegant though

Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>

--

Changelog from v1:
* #define cleanups suggested by Thomas/Benh
* Fix makefile which missed passing $FLAG for building llfw
* renamed vio-nvram.fs as rtas-nvram.fs

1 files changed, 48 insertions, 0 deletions

diff --git a/board-qemu/slof/rtas-nvram.fs b/board-qemu/slof/rtas-nvram.fs
new file mode 100644
index 0000000..fdebfb2
--- /dev/null
+++ b/board-qemu/slof/rtas-nvram.fs
@@ -0,0 +1,48 @@
+\ *****************************************************************************
+\ * Copyright (c) 2012 IBM Corporation
+\ * All rights reserved.
+\ * This program and the accompanying materials
+\ * are made available under the terms of the BSD License
+\ * which accompanies this distribution, and is available at
+\ * http://www.opensource.org/licenses/bsd-license.php
+\ *
+\ * Contributors:
+\ *     IBM Corporation - initial implementation
+\ ****************************************************************************/
+
+." Populating " pwd cr
+
+0 VALUE my-nvram-fetch
+0 VALUE my-nvram-store
+0 VALUE my-nvram-size
+0 VALUE nvram-addr
+
+: open true ;
+: close ;
+
+: write ( adr len -- actual )
+  nip
+;
+
+: read  ( adr len -- actual )
+  nip
+;
+
+: setup-alias
+    " nvram" find-alias 0= IF
+        " nvram" get-node node>path set-alias
+    ELSE
+        drop
+    THEN
+;
+
+" #bytes" get-node get-package-property 0= IF
+    decode-int to my-nvram-size 2drop
+    " nvram-fetch" rtas-get-token to my-nvram-fetch
+    " nvram-store" rtas-get-token to my-nvram-store
+    my-nvram-size to nvram-size
+    nvram-size alloc-mem to nvram-addr
+    my-nvram-fetch my-nvram-store nvram-size nvram-addr internal-nvram-init
+THEN
+
+setup-alias