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authorYinghai Lu <yinghai@kernel.org>2013-01-28 20:16:44 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2013-01-29 19:32:33 -0800
commitee92d815027a76ef92f3ec7b155b0c8aa345f239 (patch)
treea5315ec33bba27ada3247e7e045912827f05a5e1 /arch/x86/kernel/head64.c
parent0e691cf824f76adefb4498fe39c300aba2c2575a (diff)
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/kernel/head64.c')
-rw-r--r--arch/x86/kernel/head64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 62c8ce44cac4..6873b070d72c 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -116,6 +116,8 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
+ cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}