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authorYinghai Lu <yinghai@kernel.org>2013-01-24 12:19:49 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2013-01-29 15:12:26 -0800
commitfa2bbce985ca97943305cdc81d9626e6810ed7f2 (patch)
treebd0f9e484064f0987dfe25db568ccf290158c54c
parentaece27851d44bde62fc0587e06f5e8e27fd96e5f (diff)
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x86, 64bit: Copy struct boot_params early
We want to support struct boot_params (formerly known as the zero-page, or real-mode data) above the 4 GiB mark. We will have #PF handler to set page table for not accessible ram early, but want to limit it before x86_64_start_reservations to limit the code change to native path only. Also we will need the ramdisk info in struct boot_params to access the microcode blob in ramdisk in x86_64_start_kernel, so copy struct boot_params early makes it accessing ramdisk info simple. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Link: http://lkml.kernel.org/r/1359058816-7615-9-git-send-email-yinghai@kernel.org Cc: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
-rw-r--r--arch/x86/kernel/head64.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 849fc9e63c2f..7785e66840a4 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -89,6 +89,8 @@ void __init x86_64_start_kernel(char * real_mode_data)
}
load_idt((const struct desc_ptr *)&idt_descr);
+ copy_bootdata(__va(real_mode_data));
+
if (console_loglevel == 10)
early_printk("Kernel alive\n");
@@ -97,7 +99,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
void __init x86_64_start_reservations(char *real_mode_data)
{
- copy_bootdata(__va(real_mode_data));
+ /* version is always not zero if it is copied */
+ if (!boot_params.hdr.version)
+ copy_bootdata(__va(real_mode_data));
memblock_reserve(__pa_symbol(&_text),
__pa_symbol(&__bss_stop) - __pa_symbol(&_text));