From: Yinghai Lu Date: Thu, 24 Jan 2013 20:19:49 +0000 (-0800) Subject: x86, 64bit: Copy struct boot_params early X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fa2bbce985ca97943305cdc81d9626e6810ed7f2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Link: http://lkml.kernel.org/r/1359058816-7615-9-git-send-email-yinghai@kernel.org Cc: Alexander Duyck Cc: Fenghua Yu Signed-off-by: H. Peter Anvin --- 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));