[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3] xen/arm: build as zImage
On Tue, 27 Nov 2012, Stefano Stabellini wrote: > + .word (_end - _start) /* zImage end address */ Actually the assembler has problems digesting this expression. This patch actually compiles: --- xen/arm: build as zImage The zImage format is extremely simple: it only consists of a magic number and 2 addresses in a specific position (see http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html#d0e309). Some bootloaders expect a zImage; considering that it doesn't cost us much to build Xen compatible with the format, make it so. Changes in v3: - pass the correct size; - go back to the original no-ops plus branch for consistency with Linux. Changes in v2: - code style; - pass 0 a start address. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> diff --git a/xen/arch/arm/head.S b/xen/arch/arm/head.S index 25c4cfe..6cb5d1b 100644 --- a/xen/arch/arm/head.S +++ b/xen/arch/arm/head.S @@ -22,6 +22,8 @@ #include <asm/processor-ca15.h> #include <asm/asm_defns.h> +#define ZIMAGE_MAGIC_NUMBER 0x016f2818 + #define PT_PT 0xe7f /* nG=1, AF=1, SH=10, AP=01, NS=1, ATTR=111, T=1, P=1 */ #define PT_MEM 0xe7d /* nG=1, AF=1, SH=10, AP=01, NS=1, ATTR=111, T=0, P=1 */ #define PT_DEV 0xe71 /* nG=1, AF=1, SH=10, AP=01, NS=1, ATTR=100, T=0, P=1 */ @@ -52,6 +54,22 @@ * or the initial pagetable code below will need adjustment. */ .global start start: + + /* zImage magic header, see: + * http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html#d0e309 + */ + .rept 7 + mov r0, r0 + .endr + mov r0, r0 + b past_zImage + + .word ZIMAGE_MAGIC_NUMBER /* Magic numbers to help the loader */ + .word 0x00000000 /* absolute load/run zImage address or + * 0 for PiC */ + .word (_end - start) /* zImage end address */ + +past_zImage: cpsid aif /* Disable all interrupts */ /* Save the bootloader arguments in less-clobberable registers */ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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