[v6,5/6] rtas: Store RTAS address and entry in the device tree

Message ID 20171024013153.28200-6-aik@ozlabs.ru
State New
Headers show
Series
  • fdt: Pass the resulting device tree to QEMU + related fixes
Related show

Commit Message

Alexey Kardashevskiy Oct. 24, 2017, 1:31 a.m.
At the moment we count on the guest kernel to update or create device
tree properties pointing to the instantiated RTAS copy which is not
very reliable.

This stores rtas-base and rtas-size in the DT at the instantiation
point so later on the H_UPDATE_DT hcall can supply QEMU with an updated
location of RTAS.

This superseeds f9a60de30 "Add private HCALL to inform updated
RTAS base and entry".

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v5:
* ditched rtas-entry, added rtas-size (which is always 20 bytes though)
---
 board-qemu/slof/rtas.fs | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/board-qemu/slof/rtas.fs b/board-qemu/slof/rtas.fs
index f1a4abe..092f5b1 100644
--- a/board-qemu/slof/rtas.fs
+++ b/board-qemu/slof/rtas.fs
@@ -176,7 +176,14 @@  rtas-node set-node
 : open true ;
 : close ;
 
+: store-rtas-loc ( adr )
+    s" /rtas" find-node >r
+    encode-int s" slof,rtas-base" r@ set-property
+    rtas-size encode-int s" slof,rtas-size" r> set-property
+;
+
 : instantiate-rtas ( adr -- entry )
+    dup store-rtas-loc
     dup rtas-base swap rtas-size move
     rtas-entry rtas-base - +
 ;