[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 5/4] 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> --- xen/arch/arm/arm32/head.S | 3 +++ xen/arch/arm/arm64/head.S | 3 +++ xen/arch/arm/xen.lds.S | 6 ++++++ 3 files changed, 12 insertions(+) diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S index caf7934..b4c3973 100644 --- a/xen/arch/arm/arm32/head.S +++ b/xen/arch/arm/arm32/head.S @@ -458,6 +458,9 @@ fail: PRINT("- Boot failed -\r\n") 1: wfe b 1b +.globl _end_boot +_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 f28b74a..a52e2e4 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -487,6 +487,9 @@ fail: PRINT("- Boot failed -\r\n") 1: wfe b 1b +.globl _end_boot +_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") -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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