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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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2
arch/x86/Kconfig.debug
View File

@ -6,7 +6,7 @@ config TRACE_IRQFLAGS_SUPPORT
source "lib/Kconfig.debug"
config EARLY_PRINTK
bool "Early printk" if EMBEDDED && DEBUG_KERNEL && X86_32
bool "Early printk" if EMBEDDED
default y
help
Write kernel log output directly into the VGA buffer or to a serial

7
arch/x86/kernel/head64.c
View File

@ -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

1
include/asm-x86/kdebug.h
View File

@ -22,7 +22,6 @@ enum die_val {
DIE_PAGE_FAULT,
};
extern void early_printk(const char *fmt, ...) __attribute__((format(printf,1,2)));
extern void printk_address(unsigned long address);
extern void die(const char *,struct pt_regs *,long);
extern int __must_check __die(const char *, struct pt_regs *, long);

3
include/linux/kernel.h
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@ -194,6 +194,9 @@ static inline int log_buf_read(int idx) { return 0; }
static inline int log_buf_copy(char *dest, int idx, int len) { return 0; }
#endif
extern void __attribute__((format(printf, 1, 2)))
early_printk(const char *fmt, ...);
unsigned long int_sqrt(unsigned long);
extern int printk_ratelimit(void);

7
kernel/printk.c
View File

@ -36,6 +36,13 @@
#include <asm/uaccess.h>
/*
* Architectures can override it:
*/
void __attribute__((weak)) early_printk(const char *fmt, ...)
{
}
#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
/* printk's without a loglevel use this.. */