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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2018-03-12 13:02:44 +0300
committerIngo Molnar <mingo@kernel.org>2018-03-12 11:49:24 +0100
commitf7ff53e4702be9ac49deacd518dd243de45c9980 (patch)
tree6e49ecfa044a92861ea201f6e4d8f51a31cc6536 /arch/x86/boot
parent7beebaccd5083d61e975acb581bd528b9326e7c4 (diff)
x86/boot/compressed/64: Use stack from trampoline memory
As the first step on using trampoline memory, let's make 32-bit code use stack there. Separate stack is required to return back from trampoline and we cannot user stack from 64-bit mode as it may be above 4G. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180312100246.89175-3-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/compressed/head_64.S6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index f0c3a2f7e528..12915511be61 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -33,6 +33,7 @@
#include <asm/processor-flags.h>
#include <asm/asm-offsets.h>
#include <asm/bootparam.h>
+#include "pgtable.h"
/*
* Locally defined symbols should be marked hidden:
@@ -359,6 +360,8 @@ ENTRY(startup_64)
pushq %rax
lretq
lvl5:
+ /* Restore the stack, the 32-bit trampoline uses its own stack */
+ leaq boot_stack_end(%rbx), %rsp
/*
* cleanup_trampoline() would restore trampoline memory.
@@ -513,6 +516,9 @@ compatible_mode:
movl %eax, %ds
movl %eax, %ss
+ /* Set up new stack */
+ leal TRAMPOLINE_32BIT_STACK_END(%ecx), %esp
+
/* Disable paging */
movl %cr0, %eax
btrl $X86_CR0_PG_BIT, %eax