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, 14 insertions, 0 deletions

diff --git a/lib/libhvcall/libhvcall.h b/lib/libhvcall/libhvcall.h
index 302e2a3..6e418ba 100644
--- a/lib/libhvcall/libhvcall.h
+++ b/lib/libhvcall/libhvcall.h
@@ -70,6 +70,20 @@ static inline long h_add_logical_lan_buffer(unsigned long unit_address,
 	return hv_generic(H_ADD_LOGICAL_LAN_BUFFER, unit_address, buffer);
 }
 
+#define HV_RTAS_MAX_ARGRET	5
+
+struct hv_rtas_call {
+	uint32_t token;
+	uint32_t nargs;
+	uint32_t nrets;
+	uint32_t argret[HV_RTAS_MAX_ARGRET];
+};
+
+static inline unsigned long h_rtas(struct hv_rtas_call *rtas_buf)
+{
+	return hv_generic(KVMPPC_H_RTAS, (unsigned long)rtas_buf);
+}
+
 extern unsigned long hv_logical_ci_load(unsigned long size, unsigned long addr);
 extern unsigned long hv_logical_ci_store(unsigned long size, unsigned long addr,
 					 unsigned long value);