c418814fae
[ Upstream commit 30a2441cae7b149ff484a697bf9eb8de53240a4f ]
During the assembly cleanup patchset review, I found more symbols which
are used only locally. So make them really local by prepending ".L" to
them. Namely:
- wakeup_idt is used only in realmode/rm/wakeup_asm.S.
- in_pm32 is used only in boot/pmjump.S.
- retint_user is used only in entry/entry_64.S, perhaps since commit
2ec67971fa ("x86/entry/64/compat: Remove most of the fast system
call machinery"), where entry_64_compat's caller was removed.
Drop GLOBAL from all of them too. I do not see more candidates in the
series.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20191011092213.31470-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Stable-dep-of: 264b82fdb498 ("x86/decompressor: Don't rely on upper 32 bits of GPRs being preserved")
Signed-off-by: Sasha Levin <sashal@kernel.org>
179 lines
3.7 KiB
ArmAsm
179 lines
3.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* ACPI wakeup real mode startup stub
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/msr-index.h>
|
|
#include <asm/page_types.h>
|
|
#include <asm/pgtable_types.h>
|
|
#include <asm/processor-flags.h>
|
|
#include "realmode.h"
|
|
#include "wakeup.h"
|
|
|
|
.code16
|
|
|
|
/* This should match the structure in wakeup.h */
|
|
.section ".data", "aw"
|
|
|
|
.balign 16
|
|
GLOBAL(wakeup_header)
|
|
video_mode: .short 0 /* Video mode number */
|
|
pmode_entry: .long 0
|
|
pmode_cs: .short __KERNEL_CS
|
|
pmode_cr0: .long 0 /* Saved %cr0 */
|
|
pmode_cr3: .long 0 /* Saved %cr3 */
|
|
pmode_cr4: .long 0 /* Saved %cr4 */
|
|
pmode_efer: .quad 0 /* Saved EFER */
|
|
pmode_gdt: .quad 0
|
|
pmode_misc_en: .quad 0 /* Saved MISC_ENABLE MSR */
|
|
pmode_behavior: .long 0 /* Wakeup behavior flags */
|
|
realmode_flags: .long 0
|
|
real_magic: .long 0
|
|
signature: .long WAKEUP_HEADER_SIGNATURE
|
|
END(wakeup_header)
|
|
|
|
.text
|
|
.code16
|
|
|
|
.balign 16
|
|
ENTRY(wakeup_start)
|
|
cli
|
|
cld
|
|
|
|
LJMPW_RM(3f)
|
|
3:
|
|
/* Apparently some dimwit BIOS programmers don't know how to
|
|
program a PM to RM transition, and we might end up here with
|
|
junk in the data segment descriptor registers. The only way
|
|
to repair that is to go into PM and fix it ourselves... */
|
|
movw $16, %cx
|
|
lgdtl %cs:wakeup_gdt
|
|
movl %cr0, %eax
|
|
orb $X86_CR0_PE, %al
|
|
movl %eax, %cr0
|
|
ljmpw $8, $2f
|
|
2:
|
|
movw %cx, %ds
|
|
movw %cx, %es
|
|
movw %cx, %ss
|
|
movw %cx, %fs
|
|
movw %cx, %gs
|
|
|
|
andb $~X86_CR0_PE, %al
|
|
movl %eax, %cr0
|
|
LJMPW_RM(3f)
|
|
3:
|
|
/* Set up segments */
|
|
movw %cs, %ax
|
|
movw %ax, %ss
|
|
movl $rm_stack_end, %esp
|
|
movw %ax, %ds
|
|
movw %ax, %es
|
|
movw %ax, %fs
|
|
movw %ax, %gs
|
|
|
|
lidtl .Lwakeup_idt
|
|
|
|
/* Clear the EFLAGS */
|
|
pushl $0
|
|
popfl
|
|
|
|
/* Check header signature... */
|
|
movl signature, %eax
|
|
cmpl $WAKEUP_HEADER_SIGNATURE, %eax
|
|
jne bogus_real_magic
|
|
|
|
/* Check we really have everything... */
|
|
movl end_signature, %eax
|
|
cmpl $REALMODE_END_SIGNATURE, %eax
|
|
jne bogus_real_magic
|
|
|
|
/* Call the C code */
|
|
calll main
|
|
|
|
/* Restore MISC_ENABLE before entering protected mode, in case
|
|
BIOS decided to clear XD_DISABLE during S3. */
|
|
movl pmode_behavior, %edi
|
|
btl $WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE, %edi
|
|
jnc 1f
|
|
|
|
movl pmode_misc_en, %eax
|
|
movl pmode_misc_en + 4, %edx
|
|
movl $MSR_IA32_MISC_ENABLE, %ecx
|
|
wrmsr
|
|
1:
|
|
|
|
/* Do any other stuff... */
|
|
|
|
#ifndef CONFIG_64BIT
|
|
/* This could also be done in C code... */
|
|
movl pmode_cr3, %eax
|
|
movl %eax, %cr3
|
|
|
|
btl $WAKEUP_BEHAVIOR_RESTORE_CR4, %edi
|
|
jnc 1f
|
|
movl pmode_cr4, %eax
|
|
movl %eax, %cr4
|
|
1:
|
|
btl $WAKEUP_BEHAVIOR_RESTORE_EFER, %edi
|
|
jnc 1f
|
|
movl pmode_efer, %eax
|
|
movl pmode_efer + 4, %edx
|
|
movl $MSR_EFER, %ecx
|
|
wrmsr
|
|
1:
|
|
|
|
lgdtl pmode_gdt
|
|
|
|
/* This really couldn't... */
|
|
movl pmode_entry, %eax
|
|
movl pmode_cr0, %ecx
|
|
movl %ecx, %cr0
|
|
ljmpl $__KERNEL_CS, $pa_startup_32
|
|
/* -> jmp *%eax in trampoline_32.S */
|
|
#else
|
|
jmp trampoline_start
|
|
#endif
|
|
|
|
bogus_real_magic:
|
|
1:
|
|
hlt
|
|
jmp 1b
|
|
|
|
.section ".rodata","a"
|
|
|
|
/*
|
|
* Set up the wakeup GDT. We set these up as Big Real Mode,
|
|
* that is, with limits set to 4 GB. At least the Lenovo
|
|
* Thinkpad X61 is known to need this for the video BIOS
|
|
* initialization quirk to work; this is likely to also
|
|
* be the case for other laptops or integrated video devices.
|
|
*/
|
|
|
|
.balign 16
|
|
GLOBAL(wakeup_gdt)
|
|
.word 3*8-1 /* Self-descriptor */
|
|
.long pa_wakeup_gdt
|
|
.word 0
|
|
|
|
.word 0xffff /* 16-bit code segment @ real_mode_base */
|
|
.long 0x9b000000 + pa_real_mode_base
|
|
.word 0x008f /* big real mode */
|
|
|
|
.word 0xffff /* 16-bit data segment @ real_mode_base */
|
|
.long 0x93000000 + pa_real_mode_base
|
|
.word 0x008f /* big real mode */
|
|
END(wakeup_gdt)
|
|
|
|
.section ".rodata","a"
|
|
.balign 8
|
|
|
|
/* This is the standard real-mode IDT */
|
|
.balign 16
|
|
.Lwakeup_idt:
|
|
.word 0xffff /* limit */
|
|
.long 0 /* address */
|
|
.word 0
|
|
END(.Lwakeup_idt)
|