Commit fa2bbce9 authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin

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: default avatarYinghai 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: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent aece2785
...@@ -89,6 +89,8 @@ void __init x86_64_start_kernel(char * real_mode_data) ...@@ -89,6 +89,8 @@ void __init x86_64_start_kernel(char * real_mode_data)
} }
load_idt((const struct desc_ptr *)&idt_descr); load_idt((const struct desc_ptr *)&idt_descr);
copy_bootdata(__va(real_mode_data));
if (console_loglevel == 10) if (console_loglevel == 10)
early_printk("Kernel alive\n"); early_printk("Kernel alive\n");
...@@ -97,7 +99,9 @@ void __init x86_64_start_kernel(char * real_mode_data) ...@@ -97,7 +99,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
void __init x86_64_start_reservations(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), memblock_reserve(__pa_symbol(&_text),
__pa_symbol(&__bss_stop) - __pa_symbol(&_text)); __pa_symbol(&__bss_stop) - __pa_symbol(&_text));
......
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