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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 14:13:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 14:13:30 -0800 |
| commit | 06cc6b969c6375c65d0abbe4113af7949da29ab8 (patch) | |
| tree | 587d5f99fcadaf162b260a388371bea04ef1fe1b /arch/x86/kernel/head_64.S | |
| parent | Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| parent | x86/boot/64: Optimize fixmap page fixup (diff) | |
| download | linux-dev-06cc6b969c6375c65d0abbe4113af7949da29ab8.tar.xz linux-dev-06cc6b969c6375c65d0abbe4113af7949da29ab8.zip | |
Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 boot updates from Ingo Molnar:
"Misc cleanups/simplifications by Borislav Petkov, Paul Bolle and Wei
Yang"
* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot/64: Optimize fixmap page fixup
x86/boot: Simplify the GDTR calculation assembly code a bit
x86/boot/build: Remove always empty $(USERINCLUDE)
Diffstat (limited to 'arch/x86/kernel/head_64.S')
| -rw-r--r-- | arch/x86/kernel/head_64.S | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index a15d381e6020..90de28841242 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -142,6 +142,9 @@ startup_64: decl %ecx jnz 1b + test %rbp, %rbp + jz .Lskip_fixup + /* * Fixup the kernel text+data virtual addresses. Note that * we might write invalid pmds, when the kernel is relocated @@ -149,9 +152,9 @@ startup_64: * beyond _end. */ leaq level2_kernel_pgt(%rip), %rdi - leaq 4096(%rdi), %r8 + leaq PAGE_SIZE(%rdi), %r8 /* See if it is a valid page table entry */ -1: testb $1, 0(%rdi) +1: testb $_PAGE_PRESENT, 0(%rdi) jz 2f addq %rbp, 0(%rdi) /* Go to the next page */ @@ -162,6 +165,7 @@ startup_64: /* Fixup phys_base */ addq %rbp, phys_base(%rip) +.Lskip_fixup: movq $(early_level4_pgt - __START_KERNEL_map), %rax jmp 1f ENTRY(secondary_startup_64) |