[Xen-devel] [PATCH 4/8] arm: link a device tree blob into the xen image

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Link a device tree blob (DTB) into the xen image.  This is loaded
immediately after Xen and xen_start() is called with the correct
address in atag_paddr.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/arch/arm/Makefile  |    7 +++++--
 xen/arch/arm/dtb.S     |    2 ++
 xen/arch/arm/head.S    |    4 ++++
 xen/arch/arm/xen.lds.S |    5 +++++
 4 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 xen/arch/arm/dtb.S

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 9bc2fc8..ac346a5 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -1,5 +1,6 @@
 subdir-y += lib
 
+obj-y += dtb.o
 obj-y += dummy.o
 obj-y += entry.o
 obj-y += domain.o
@@ -27,7 +28,7 @@ ALL_OBJS := head.o $(ALL_OBJS)
 $(TARGET): $(TARGET)-syms
        # XXX: VE model loads by VMA so instead of
        # making a proper ELF we link with LMA == VMA and adjust crudely
-       $(OBJCOPY) --change-addresses +0x7fe00000 $< $@
+       $(OBJCOPY) --change-addresses +0x80000000 $< $@
        # XXX strip it
 
 #$(TARGET): $(TARGET)-syms $(efi-y) boot/mkelf32
@@ -50,7 +51,7 @@ endif
 $(BASEDIR)/common/symbols-dummy.o:
        $(MAKE) -f $(BASEDIR)/Rules.mk -C $(BASEDIR)/common symbols-dummy.o
 
-$(TARGET)-syms: prelink.o xen.lds $(BASEDIR)/common/symbols-dummy.o
+$(TARGET)-syms: prelink.o xen.lds $(BASEDIR)/common/symbols-dummy.o dtb.o
        $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
            $(BASEDIR)/common/symbols-dummy.o -o $(@D)/.$(@F).0
        $(NM) -n $(@D)/.$(@F).0 | $(BASEDIR)/tools/symbols >$(@D)/.$(@F).0.S
@@ -71,6 +72,8 @@ xen.lds: xen.lds.S
        sed -e 's/xen\.lds\.o:/xen\.lds:/g' <.xen.lds.d >.xen.lds.d.new
        mv -f .xen.lds.d.new .xen.lds.d
 
+dtb.o: platform.dtb
+
 .PHONY: clean
 clean::
        rm -f asm-offsets.s xen.lds
diff --git a/xen/arch/arm/dtb.S b/xen/arch/arm/dtb.S
new file mode 100644
index 0000000..0728c04
--- /dev/null
+++ b/xen/arch/arm/dtb.S
@@ -0,0 +1,2 @@
+        .section .dtb,#alloc
+        .incbin "platform.dtb"
diff --git a/xen/arch/arm/head.S b/xen/arch/arm/head.S
index 57b990d..22ac512 100644
--- a/xen/arch/arm/head.S
+++ b/xen/arch/arm/head.S
@@ -55,6 +55,10 @@ start:
        adr   r9, start              /* r9  := paddr (start) */
        sub   r10, r9, r0            /* r10 := phys-offset */
 
+        /* XXX: using the DTB in the .dtb section. */
+        ldr   r8, =_sdtb
+        add   r8, r10                /* r8 := paddr(DTB) */
+
 #ifdef EARLY_UART_ADDRESS
        /* Say hello */
        ldr   r11, =EARLY_UART_ADDRESS  /* r11 := UART base address */
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index 5a62e2c..30fc7b7 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -122,6 +122,11 @@ SECTIONS
   } :text
   _end = . ;
 
+  /* XXX: don't yet have a bootloader to provide the DTB, link it into
+     Xen in its own section. */
+  _sdtb = .;
+  .dtb : { dtb.o(.dtb) } :text
+
   /* Sections to be discarded */
   /DISCARD/ : {
        *(.exit.text)
-- 
1.7.2.5


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