[ImageBuilder] [PATCH] uboot-script-gen: Add DOMU_STATIC_MEM

[Xenia Ragiadakou <burzalodowa@xxxxxxxxx>]

Add a new config parameter to configure a dom0less VM with static allocation.
DOMU_STATIC_MEM[number]="baseaddr1 size1 ... baseaddrN sizeN"
The parameter specifies the host physical address regions to be statically
allocated to the VM. Each region is defined by its start address and size.

For instance,
DOMU_STATIC_MEM[0]="0x30000000 0x10000000 0x50000000 0x20000000"
indicates that the host memory regions [0x30000000, 0x40000000) and
[0x50000000, 0x70000000) are statically allocated to the first dom0less VM.

Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
---
 README.md                |  4 ++++
 scripts/uboot-script-gen | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/README.md b/README.md
index 8ce13f0..876e46d 100644
--- a/README.md
+++ b/README.md
@@ -154,6 +154,10 @@ Where:
   automatically at boot as dom0-less guest. It can still be created
   later from Dom0.
 
+- DOMU_STATIC_MEM[number]="baseaddr1 size1 ... baseaddrN sizeN"
+  if specified, indicates the host physical address regions
+  [baseaddr, baseaddr + size) to be reserved to the VM for static allocation.
+
 - LINUX is optional but specifies the Linux kernel for when Xen is NOT
   used.  To enable this set any LINUX\_\* variables and do NOT set the
   XEN variable.
diff --git a/scripts/uboot-script-gen b/scripts/uboot-script-gen
index 0adf523..bb2ee2d 100755
--- a/scripts/uboot-script-gen
+++ b/scripts/uboot-script-gen
@@ -108,6 +108,22 @@ function add_device_tree_passthrough()
     dt_set "$path/module$addr" "reg" "hex"  "0x0 $addr 0x0 $(printf "0x%x" 
$size)"
 }
 
+function add_device_tree_static_mem()
+{
+    local path=$1
+    local regions=$2
+
+    dt_set "$path" "#xen,static-mem-address-cells" "hex" "0x2"
+    dt_set "$path" "#xen,static-mem-size-cells" "hex" "0x2"
+
+    for i in ${regions[@]}
+    do
+       cells+=("$(printf "0x%x 0x%x" $(($i >> 32)) $(($i & ((1 << 32) - 1))))")
+    done
+
+    dt_set "$path" "xen,static-mem" "hex" "${cells[*]}"
+}
+
 function xen_device_tree_editing()
 {
     dt_set "/chosen" "#address-cells" "hex" "0x2"
@@ -143,6 +159,10 @@ function xen_device_tree_editing()
         dt_set "/chosen/domU$i" "#size-cells" "hex" "0x2"
         dt_set "/chosen/domU$i" "memory" "int" "0 ${DOMU_MEM[$i]}"
         dt_set "/chosen/domU$i" "cpus" "int" "${DOMU_VCPUS[$i]}"
+       if test "${DOMU_STATIC_MEM[$i]}"
+        then
+           add_device_tree_static_mem "/chosen/domU$i" "${DOMU_STATIC_MEM[$i]}"
+        fi
         dt_set "/chosen/domU$i" "vpl011" "hex" "0x1"
         add_device_tree_kernel "/chosen/domU$i" ${domU_kernel_addr[$i]} 
${domU_kernel_size[$i]} "${DOMU_CMD[$i]}"
         if test "${domU_ramdisk_addr[$i]}"
-- 
2.34.1