Commit fa2bbce9 authored Jan 24, 2013 by Yinghai Lu Committed by H. Peter Anvin Jan 29, 2013

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>

parent aece2785

arch/x86/kernel/head64.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -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");

		@@ -97,6 +99,8 @@ void __init x86_64_start_kernel(char * real_mode_data)

		void __init x86_64_start_reservations(char *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),