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authorThomas Gleixner <tglx@linutronix.de>2017-08-28 08:47:48 +0200
committerIngo Molnar <mingo@kernel.org>2017-08-29 12:07:26 +0200
commit87e81786b13b267c4355e0d23e33c7e4c08fa63f (patch)
treec33b075d709e02a6b82645b2ce6e92bd69628081 /arch/x86/kernel/head_32.S
parent588787fde7aa346f345e1a7600f84d88039fc9df (diff)
x86/idt: Move early IDT setup out of 32-bit asm
The early IDT setup can be done in C code like it's done on 64-bit kernels. Reuse the 64-bit version. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> 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: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/20170828064958.757980775@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/head_32.S')
-rw-r--r--arch/x86/kernel/head_32.S36
1 files changed, 2 insertions, 34 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index ce8c6ed417a4..a615a5efa8ec 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -345,7 +345,6 @@ ENTRY(startup_32_smp)
movl %eax,%cr0
lgdt early_gdt_descr
- lidt idt_descr
ljmp $(__KERNEL_CS),$1f
1: movl $(__KERNEL_DS),%eax # reload all the segment registers
movl %eax,%ss # after changing gdt.
@@ -378,37 +377,6 @@ ENDPROC(startup_32_smp)
*/
__INIT
setup_once:
- /*
- * Set up a idt with 256 interrupt gates that push zero if there
- * is no error code and then jump to early_idt_handler_common.
- * It doesn't actually load the idt - that needs to be done on
- * each CPU. Interrupts are enabled elsewhere, when we can be
- * relatively sure everything is ok.
- */
-
- movl $idt_table,%edi
- movl $early_idt_handler_array,%eax
- movl $NUM_EXCEPTION_VECTORS,%ecx
-1:
- movl %eax,(%edi)
- movl %eax,4(%edi)
- /* interrupt gate, dpl=0, present */
- movl $(0x8E000000 + __KERNEL_CS),2(%edi)
- addl $EARLY_IDT_HANDLER_SIZE,%eax
- addl $8,%edi
- loop 1b
-
- movl $256 - NUM_EXCEPTION_VECTORS,%ecx
- movl $ignore_int,%edx
- movl $(__KERNEL_CS << 16),%eax
- movw %dx,%ax /* selector = 0x0010 = cs */
- movw $0x8E00,%dx /* interrupt gate - dpl=0, present */
-2:
- movl %eax,(%edi)
- movl %edx,4(%edi)
- addl $8,%edi
- loop 2b
-
#ifdef CONFIG_CC_STACKPROTECTOR
/*
* Configure the stack canary. The linker can't handle this by
@@ -498,7 +466,7 @@ ENDPROC(early_idt_handler_common)
/* This is the default interrupt "handler" :-) */
ALIGN
-ignore_int:
+ENTRY(early_ignore_irq)
cld
#ifdef CONFIG_PRINTK
pushl %eax
@@ -533,7 +501,7 @@ ignore_int:
hlt_loop:
hlt
jmp hlt_loop
-ENDPROC(ignore_int)
+ENDPROC(early_ignore_irq)
__INITDATA
.align 4
GLOBAL(early_recursion_flag)