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| author | H. Peter Anvin <hpa@zytor.com> | 2024-02-02 04:51:43 +0100 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-02-06 10:50:21 +0100 |
| commit | 9ba8ec8ee67a00eb5631364e4b716f35559724d4 (patch) | |
| tree | fd97d79f34e63f59b838476fe03b467ff167da15 | |
| parent | x86/startup_64: Drop long return to initial_code pointer (diff) | |
| download | linux-9ba8ec8ee67a00eb5631364e4b716f35559724d4.tar.xz linux-9ba8ec8ee67a00eb5631364e4b716f35559724d4.zip | |
x86/boot: Add error_putdec() helper
Add a helper to print decimal numbers to early console.
Suggested-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Jun'ichi Nomura <junichi.nomura@nec.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/lkml/20240123112624.GBZa-iYP1l9SSYtr-V@fat_crate.local/
Link: https://lore.kernel.org/r/20240202035052.17963-1-junichi.nomura@nec.com
| -rw-r--r-- | arch/x86/boot/compressed/misc.c | 33 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc.h | 2 |
2 files changed, 25 insertions, 10 deletions
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index b99e08e6815b..bf2aac4f195e 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -164,21 +164,34 @@ void __putstr(const char *s) outb(0xff & (pos >> 1), vidport+1); } -void __puthex(unsigned long value) +static noinline void __putnum(unsigned long value, unsigned int base, + int mindig) { - char alpha[2] = "0"; - int bits; + char buf[8*sizeof(value)+1]; + char *p; - for (bits = sizeof(value) * 8 - 4; bits >= 0; bits -= 4) { - unsigned long digit = (value >> bits) & 0xf; + p = buf + sizeof(buf); + *--p = '\0'; - if (digit < 0xA) - alpha[0] = '0' + digit; - else - alpha[0] = 'a' + (digit - 0xA); + while (mindig-- > 0 || value) { + unsigned char digit = value % base; + digit += (digit >= 10) ? ('a'-10) : '0'; + *--p = digit; - __putstr(alpha); + value /= base; } + + __putstr(p); +} + +void __puthex(unsigned long value) +{ + __putnum(value, 16, sizeof(value)*2); +} + +void __putdec(unsigned long value) +{ + __putnum(value, 10, 1); } #ifdef CONFIG_X86_NEED_RELOCS diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index bc2f0f17fb90..6502bc69d1b8 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -63,8 +63,10 @@ void *malloc(int size); void free(void *where); void __putstr(const char *s); void __puthex(unsigned long value); +void __putdec(unsigned long value); #define error_putstr(__x) __putstr(__x) #define error_puthex(__x) __puthex(__x) +#define error_putdec(__x) __putdec(__x) #ifdef CONFIG_X86_VERBOSE_BOOTUP |