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Message-Id: <1353055989-31939-4-git-send-email-yinghai@kernel.org> Date: Fri, 16 Nov 2012 00:53:03 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com> Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>, "Eric W. Biederman" <ebiederm@...ssion.com> Subject: [PATCH 3/9] x86, 64bit: set extra ident page table for whole kernel range Current when kernel is loaded above 1G, only [_text, _text+2M] is set up with extra ident page table. That is not enough, some variables that could be used early are out of that range. (like gdt...) Just set map with [_text, _end] for all text/data/bss/brk... Signed-off-by: Yinghai Lu <yinghai@...nel.org> Cc: "Eric W. Biederman" <ebiederm@...ssion.com> --- arch/x86/kernel/head_64.S | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 94bf9cc..efc0c08 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -115,7 +115,16 @@ startup_64: andq $(PTRS_PER_PMD - 1), %rax leaq __PAGE_KERNEL_IDENT_LARGE_EXEC(%rdi), %rdx leaq level2_spare_pgt(%rip), %rbx - movq %rdx, 0(%rbx, %rax, 8) + leaq _end(%rip), %r8 + decq %r8 + shrq $PMD_SHIFT, %r8 + andq $(PTRS_PER_PMD - 1), %r8 +1: movq %rdx, 0(%rbx, %rax, 8) + addq $PMD_SIZE, %rdx + incq %rax + cmp %r8, %rax + jle 1b + ident_complete: /* -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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