This is useful for reporting various addresses or other values while
debugging early boot.
Signed-off-by: Kees Cook <keesc...@chromium.org>
---
arch/x86/boot/compressed/misc.c | 19 +++++++++++++++++++
arch/x86/boot/compressed/misc.h | 5 +++++
2 files changed, 24 insertions(+)
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 30dd59a9f0b4..1b105664f720 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -220,6 +220,25 @@ void __putstr(const char *s)
outb(0xff & (pos >> 1), vidport+1);
}
+void __puthex(unsigned long value)
+{
+ char alpha[2] = "0";
+ int bits;
+ unsigned char byte;
+
+ __putstr("0x");
+ for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) {
+ unsigned long digit = (value >> bits) & 0xf;
+
+ if (digit < 0xA)
+ alpha[0] = '0' + digit;
+ else
+ alpha[0] = 'a' + (digit - 0xA);
+
+ __putstr(alpha);
+ }
+}
+
static void error(char *x)
{
error_putstr("\n\n");
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 24e3e569a13c..6056d339fb17 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -34,16 +34,21 @@ extern memptr free_mem_ptr;
extern memptr free_mem_end_ptr;
extern struct boot_params *real_mode; /* Pointer to real-mode data */
void __putstr(const char *s);
+void __puthex(unsigned long value);
#define error_putstr(__x) __putstr(__x)
+#define error_puthex(__x) __puthex(__x)
#ifdef CONFIG_X86_VERBOSE_BOOTUP
#define debug_putstr(__x) __putstr(__x)
+#define debug_puthex(__x) __puthex(__x)
#else
static inline void debug_putstr(const char *s)
{ }
+static inline void debug_puthex(const char *s)
+{ }
#endif
--
1.9.1
--
Kees Cook
Chrome OS Security
--
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