| From | Yinghai Lu <> | Subject | [PATCH 08/35] x86, 64bit: Copy zero-page early | Date | Thu, 24 Jan 2013 12:19:49 -0800 |
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real mode data/boot_params aka zero-page could be above 4g. 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 zero-page to access the microcode blob in ramdisk in x86_64_start_kernel, so copy zero-page early makes it accessing ramdisk info simple.
Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> --- arch/x86/kernel/head64.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 7b215a5..c0a25e0 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -87,6 +87,8 @@ 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"); @@ -95,7 +97,9 @@ 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), (unsigned long)__bss_stop - (unsigned long)_text); -- 1.7.10.4
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