From: David Vrabel <david.vrabel@citrix.com>
To: xen-devel@lists.xensource.com
Cc: David Vrabel <david.vrabel@citrix.com>
Subject: [PATCH 4/7] arm: map device tree blob in initial page tables
Date: Fri, 3 Feb 2012 19:15:12 +0000 [thread overview]
Message-ID: <1328296515-25876-5-git-send-email-david.vrabel@citrix.com> (raw)
In-Reply-To: <1328296515-25876-1-git-send-email-david.vrabel@citrix.com>
From: David Vrabel <david.vrabel@citrix.com>
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@citrix.com>
---
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
next prev parent reply other threads:[~2012-02-03 19:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 19:15 [PATCH 0/7] RFC: arm: (really) minimal device tree support David Vrabel
2012-02-03 19:15 ` [PATCH 1/7] libfdt: add version 1.3.0 David Vrabel
2012-02-03 19:15 ` [PATCH 2/7] libfdt: add to build David Vrabel
2012-02-03 19:15 ` [PATCH 3/7] arm: link a device tree blob into the xen image David Vrabel
2012-02-03 20:22 ` Tim Deegan
2012-02-03 19:15 ` David Vrabel [this message]
2012-02-03 21:18 ` [PATCH 4/7] arm: map device tree blob in initial page tables Tim Deegan
2012-02-06 17:36 ` David Vrabel
2012-02-07 9:28 ` Tim Deegan
2012-02-03 19:15 ` [PATCH 5/7] libfdt: fixup libfdt_env.h for xen David Vrabel
2012-02-03 19:15 ` [PATCH 6/7] arm: add early_printk() David Vrabel
2012-02-03 19:15 ` [PATCH 7/7] arm, device tree: parse the DTB for RAM location and size David Vrabel
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