File 0104-spapr-Add-rtas_st_buffer-utility-fu.patch of Package qemu.8405

From cfe17c6959e1a373cba415c6c9ddf2eefacf1bd8 Mon Sep 17 00:00:00 2001
From: Sam bobroff <sam.bobroff@au1.ibm.com>
Date: Wed, 25 Jun 2014 13:54:29 +1000
Subject: [PATCH] spapr: Add rtas_st_buffer utility function

Add a function to write lengh + data into a buffer as required for the
emulation of the RTAS ibm,get-system-parameter call.

If the destination is smaller than the source, the write is truncated
and success is returned. This matches the behaviour of pHyp.

This will be used in following patches.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
(cherry picked from commit ce3fa1eca2c60673fede2222defb4bd13a3b5b1e)
---
 include/hw/ppc/spapr.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 0d45954ee1..5e3bba8898 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -373,6 +373,19 @@ static inline void rtas_st(target_ulong phys, int n, uint32_t val)
     stl_be_phys(&address_space_memory, ppc64_phys_to_real(phys + 4*n), val);
 }
 
+
+static inline void rtas_st_buffer(target_ulong phys, target_ulong phys_len,
+                                  uint8_t *buffer, uint16_t buffer_len)
+{
+    if (phys_len < 2) {
+        return;
+    }
+    stw_be_phys(&address_space_memory,
+                ppc64_phys_to_real(phys), buffer_len);
+    cpu_physical_memory_write(ppc64_phys_to_real(phys + 2),
+                              buffer, MIN(buffer_len, phys_len - 2));
+}
+
 typedef void (*spapr_rtas_fn)(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                               uint32_t token,
                               uint32_t nargs, target_ulong args,