[Xen-changelog] [xen master] xen: arm: ensure that the boot code is <4K in size

[patchbot@xxxxxxx]

commit 6d848a95df61a76bdf9069b4ba9286d6358784d8
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Mon Jul 21 13:59:59 2014 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Jul 24 16:23:17 2014 +0100

    xen: arm: ensure that the boot code is <4K in size
    
    This avoids having to deal with the 1:1 boot mapping crossing a
    section or page boundary.
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/arm32/head.S |    2 ++
 xen/arch/arm/arm64/head.S |    2 ++
 xen/arch/arm/xen.lds.S    |    6 ++++++
 3 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index 0a95b68..2547ce1 100644
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -457,6 +457,8 @@ fail:   PRINT("- Boot failed -\r\n")
 1:      wfe
         b     1b
 
+GLOBAL(_end_boot)
+
 /* Copy Xen to new location and switch TTBR
  * r1:r0       ttbr
  * r2          source address
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 4f0ea2d..b71b6f0 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -487,6 +487,8 @@ fail:   PRINT("- Boot failed -\r\n")
 1:      wfe
         b     1b
 
+GLOBAL(_end_boot)
+
 /* Copy Xen to new location and switch TTBR
  * x0    ttbr
  * x1    source address
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index be55dad..079e085 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -178,3 +178,9 @@ SECTIONS
   .stab.indexstr 0 : { *(.stab.indexstr) }
   .comment 0 : { *(.comment) }
 }
+
+/*
+ * We require that Xen is loaded at a 4K boundary, so this ensures that any
+ * code running on the boot time identity map cannot cross a section boundary.
+ */
+ASSERT( _end_boot - start <= PAGE_SIZE, "Boot code is larger than 4K")
--
generated by git-patchbot for /home/xen/git/xen.git#master

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