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| author | Yinghai Lu <yinghai@kernel.org> | 2013-01-29 05:16:44 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-01-30 04:32:33 +0100 |
| commit | ee92d815027a76ef92f3ec7b155b0c8aa345f239 (patch) | |
| tree | a5315ec33bba27ada3247e7e045912827f05a5e1 /arch/x86/boot/header.S | |
| parent | x86, kexec, 64bit: Only set ident mapping for ram. (diff) | |
| download | linux-ee92d815027a76ef92f3ec7b155b0c8aa345f239.tar.xz linux-ee92d815027a76ef92f3ec7b155b0c8aa345f239.zip | |
x86, boot: Support loading bzImage, boot_params and ramdisk above 4G
xloadflags bit 1 indicates that we can load the kernel and all data
structures above 4G; it is set if kernel is relocatable and 64bit.
bootloader will check if xloadflags bit 1 is set to decide if
it could load ramdisk and kernel high above 4G.
bootloader will fill value to ext_ramdisk_image/size for high 32bits
when it load ramdisk above 4G.
kernel use get_ramdisk_image/size to use ext_ramdisk_image/size to get
right positon for ramdisk.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Rob Landley <rob@landley.net>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Gokul Caushik <caushik1@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joe Millenbach <jmillenbach@gmail.com>
Link: http://lkml.kernel.org/r/1359058816-7615-26-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/boot/header.S')
| -rw-r--r-- | arch/x86/boot/header.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index 944ce595f767..9ec06a1f6d61 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -374,6 +374,14 @@ xloadflags: #else # define XLF0 0 #endif + +#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_X86_64) + /* kernel/boot_param/ramdisk could be loaded above 4g */ +# define XLF1 XLF_CAN_BE_LOADED_ABOVE_4G +#else +# define XLF1 0 +#endif + #ifdef CONFIG_EFI_STUB # ifdef CONFIG_X86_64 # define XLF23 XLF_EFI_HANDOVER_64 /* 64-bit EFI handover ok */ @@ -383,7 +391,7 @@ xloadflags: #else # define XLF23 0 #endif - .word XLF0 | XLF23 + .word XLF0 | XLF1 | XLF23 cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line, #added with boot protocol |