From fa97bdf92709adaaf8b9a5164a895e262a4fcf60 Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Sun, 11 Jul 2010 11:06:57 +0300 Subject: x86, setup: Early-boot serial I/O support This patch adds serial I/O support to the real-mode setup (very early boot) printf(). It's useful for debugging boot code when running Linux under KVM, for example. The actual code was lifted from early printk. Cc: Cyrill Gorcunov Cc: Ingo Molnar Cc: Yinghai Lu Signed-off-by: Pekka Enberg LKML-Reference: <1278835617-11368-1-git-send-email-penberg@cs.helsinki.fi> Signed-off-by: H. Peter Anvin --- arch/x86/boot/boot.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'arch/x86/boot/boot.h') diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h index 98239d2658f2..46c4c5c71af7 100644 --- a/arch/x86/boot/boot.h +++ b/arch/x86/boot/boot.h @@ -37,6 +37,8 @@ extern struct setup_header hdr; extern struct boot_params boot_params; +#define cpu_relax() asm volatile("rep; nop") + /* Basic port I/O */ static inline void outb(u8 v, u16 port) { @@ -203,6 +205,17 @@ static inline int isdigit(int ch) return (ch >= '0') && (ch <= '9'); } +static inline int isxdigit(int ch) +{ + if (isdigit(ch)) + return true; + + if ((ch >= 'a') && (ch <= 'f')) + return true; + + return (ch >= 'A') && (ch <= 'F'); +} + /* Heap -- available for dynamic lists. */ extern char _end[]; extern char *HEAP; @@ -329,10 +342,13 @@ void initregs(struct biosregs *regs); /* string.c */ int strcmp(const char *str1, const char *str2); +int strncmp(const char *cs, const char *ct, size_t count); size_t strnlen(const char *s, size_t maxlen); unsigned int atou(const char *s); +unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); /* tty.c */ +void console_init(void); void puts(const char *); void putchar(int); int getchar(void); -- cgit v1.2.3