diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-12-01 18:34:06 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-12-03 17:17:10 +0100 |
| commit | 17d57a9206b4de6ad082ac9f2d2346985abbd2aa (patch) | |
| tree | 67f321b8aa1a04c123d2b5f253b0de0a6ec0334e | |
| parent | 0c1b2724069951b1902373e688042b2ec382f68f (diff) | |
| download | linux-17d57a9206b4de6ad082ac9f2d2346985abbd2aa.tar.bz2 | |
x86: fix x86-32 early fixmap initialization.
pageexec@freemail.hu writes:
> i've just noticed that the chunk in i386/kernel/head.S ended up in a
> weird place, namely, it's not going to be executed as it's just after
> a 'jmp 3f' and before startup_32_smp, probably not what you intended.
> on a sidenote, the whole thing can be done in a single insn, like:
>
> movl $(swapper_pg_pmd - __PAGE_OFFSET + 0x067), (swapper_pg_dir -
> __PAGE_OFFSET+ 4092)
Thanks for the reminder I thought we had fixed this problem a while ago.
Needed to get fixed virtual address for USB debug and earlycon with mmio.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/head_32.S | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 374b7ece8961..ac0637a6d71c 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -193,6 +193,12 @@ default_entry: jb 10b movl %edi,(init_pg_tables_end - __PAGE_OFFSET) + /* Do an early initialization of the fixmap area */ + movl $(swapper_pg_dir - __PAGE_OFFSET), %edx + movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax + addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */ + movl %eax, 4092(%edx) + xorl %ebx,%ebx /* This is the boot CPU (BSP) */ jmp 3f /* @@ -208,12 +214,6 @@ default_entry: .section .init.text,"ax",@progbits #endif - /* Do an early initialization of the fixmap area */ - movl $(swapper_pg_dir - __PAGE_OFFSET), %edx - movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax - addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */ - movl %eax, 4092(%edx) - #ifdef CONFIG_SMP ENTRY(startup_32_smp) cld |