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x86: make early printk selectable on 64-bit as well

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Enable CONFIG_EMBEDDED to select CONFIG_EARLY_PRINTK on 64-bit as well.

saves ~2K:

   text    data     bss     dec     hex filename
   7290283 3672091 1907848 12870222         c4624e vmlinux.before
   7288373 3671795 1907848 12868016         c459b0 vmlinux.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar
2008-01-30 13:33:06 +01:00
parent 8866cd9dc9
commit 076f9776f5
6 changed files with 24 additions and 3 deletions
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7
arch/x86/kernel/head64.c
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@@ -58,8 +58,13 @@ void __init x86_64_start_kernel(char * real_mode_data)
/* Make NULL pointers segfault */
zap_identity_mappings();
for (i = 0; i < IDT_ENTRIES; i++)
for (i = 0; i < IDT_ENTRIES; i++) {
#ifdef CONFIG_EARLY_PRINTK
set_intr_gate(i, &early_idt_handlers[i]);
#else
set_intr_gate(i, early_idt_handler);
#endif
}
load_idt((const struct desc_ptr *)&idt_descr);
early_printk("Kernel alive\n");

7
arch/x86/kernel/head_64.S
View File

@@ -267,6 +267,7 @@ init_rsp:
bad_address:
jmp bad_address
#ifdef CONFIG_EARLY_PRINTK
.macro early_idt_tramp first, last
.ifgt \last-\first
early_idt_tramp \first, \last-1
@@ -281,8 +282,10 @@ early_idt_handlers:
early_idt_tramp 64, 127
early_idt_tramp 128, 191
early_idt_tramp 192, 255
#endif
ENTRY(early_idt_handler)
#ifdef CONFIG_EARLY_PRINTK
cmpl $2,early_recursion_flag(%rip)
jz 1f
incl early_recursion_flag(%rip)
@@ -311,8 +314,11 @@ ENTRY(early_idt_handler)
movq 8(%rsp),%rsi # get rip again
call __print_symbol
#endif
#endif /* EARLY_PRINTK */
1: hlt
jmp 1b
#ifdef CONFIG_EARLY_PRINTK
early_recursion_flag:
.long 0
@@ -320,6 +326,7 @@ early_idt_msg:
.asciz "PANIC: early exception %02lx rip %lx:%lx error %lx cr2 %lx\n"
early_idt_ripmsg:
.asciz "RIP %s\n"
#endif /* CONFIG_EARLY_PRINTK */
.balign PAGE_SIZE