Commit-ID: fa2bbce985ca97943305cdc81d9626e6810ed7f2 Gitweb: http://git.kernel.org/tip/fa2bbce985ca97943305cdc81d9626e6810ed7f2 Author: Yinghai Lu <ying...@kernel.org> AuthorDate: Thu, 24 Jan 2013 12:19:49 -0800 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Tue, 29 Jan 2013 15:12:26 -0800
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 <ying...@kernel.org> Link: http://lkml.kernel.org/r/1359058816-7615-9-git-send-email-ying...@kernel.org Cc: Alexander Duyck <alexander.h.du...@intel.com> Cc: Fenghua Yu <fenghua...@intel.com> Signed-off-by: H. Peter Anvin <h...@linux.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 849fc9e..7785e668 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)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
