[Xen-devel] [PATCH 4/7] arm: map device tree blob in initial page tables

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Add a 1:1 mapping for the device tree blob in the initial page tables.
This will allow the DTB to be parsed for memory information prior to
setting up the real page tables.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/arch/arm/head.S |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/head.S b/xen/arch/arm/head.S
index 9951f37..8385481 100644
--- a/xen/arch/arm/head.S
+++ b/xen/arch/arm/head.S
@@ -202,6 +202,11 @@ hyp:
        add   r4, r4, #8
        strd  r2, r3, [r1, r4]       /* Map it in the fixmap's slot */
 #endif
+       mov   r3, #0x0
+       orr   r2, r8, #0xe00
+       orr   r2, r2, #0x07d
+       mov   r4, r8, lsr #18        /* Slot for (r8 == atag_paddr) */
+       strd  r2, r3, [r1, r4]       /* Map DTB there */
 
        PRINT("- Turning on paging -\r\n")
 
-- 
1.7.2.5


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