diff options
| author | Pekka Enberg <penberg@cs.helsinki.fi> | 2010-07-11 11:06:57 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-07-12 14:46:00 -0700 |
| commit | fa97bdf92709adaaf8b9a5164a895e262a4fcf60 (patch) | |
| tree | e34f1b6232c302e39065f3dd7ef8bbf4c8ac3d3d /arch/x86/boot/boot.h | |
| parent | 589643be6693c46fbc54bae77745f336c8ed4bcc (diff) | |
| download | linux-fa97bdf92709adaaf8b9a5164a895e262a4fcf60.tar.bz2 | |
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 <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <1278835617-11368-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/boot/boot.h')
| -rw-r--r-- | arch/x86/boot/boot.h | 16 |
1 files changed, 16 insertions, 0 deletions
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); |