mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
940185910f
Assembler is not happy:
arch/x86/cpu/call32.S: Assembler messages:
arch/x86/cpu/call32.S:36: Warning: no instruction mnemonic suffix given and no register operands; using default for `retf'
Fix this by adding appropriate suffixes to the assembler commands.
Fixes: 6f92ed8f1a ("x86: Add a way to call 32-bit code from 64-bit mode")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
62 lines
1.2 KiB
ArmAsm
62 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* (C) Copyright 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#include <asm/global_data.h>
|
|
#include <asm/msr-index.h>
|
|
#include <asm/processor-flags.h>
|
|
|
|
/*
|
|
* rdi - 32-bit code segment selector
|
|
* rsi - target address
|
|
* rdx - table address (0 if none)
|
|
*/
|
|
.code64
|
|
.globl cpu_call32
|
|
cpu_call32:
|
|
cli
|
|
|
|
/* Save table pointer */
|
|
mov %edx, %ebx
|
|
|
|
/*
|
|
* Debugging option, this outputs characters to the console UART
|
|
* mov $0x3f8,%edx
|
|
* mov $'a',%al
|
|
* out %al,(%dx)
|
|
*/
|
|
|
|
pushf
|
|
push %rdi /* 32-bit code segment */
|
|
lea compat(%rip), %rax
|
|
push %rax
|
|
retfq
|
|
.code32
|
|
compat:
|
|
/*
|
|
* We are now in compatibility mode with a default operand size of
|
|
* 32 bits. First disable paging.
|
|
*/
|
|
movl %cr0, %eax
|
|
andl $~X86_CR0_PG, %eax
|
|
movl %eax, %cr0
|
|
|
|
/* Invalidate TLB */
|
|
xorl %eax, %eax
|
|
movl %eax, %cr3
|
|
|
|
/* Disable Long mode in EFER (Extended Feature Enable Register) */
|
|
movl $MSR_EFER, %ecx
|
|
rdmsr
|
|
btr $_EFER_LME, %eax
|
|
wrmsr
|
|
|
|
/* Set up table pointer for _x86boot_start */
|
|
mov %ebx, %ecx
|
|
|
|
/* Jump to the required target */
|
|
pushl %edi /* 32-bit code segment */
|
|
pushl %esi /* 32-bit target address */
|
|
retfl
|