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x86/boot: Add error_putdec() helper

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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
This commit is contained in:
H. Peter Anvin 2024-02-02 03:51:43 +00:00 • committed by Borislav Petkov (AMD)
parent 1567570624
commit 9ba8ec8ee6
2 changed files with 27 additions and 12 deletions
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37
arch/x86/boot/compressed/misc.c
View file

@ -164,21 +164,34 @@ void __putstr(const char *s)
outb(0xff & (pos >> 1), vidport+1);
}
static noinline void __putnum(unsigned long value, unsigned int base,
int mindig)
{
char buf[8*sizeof(value)+1];
char *p;
p = buf + sizeof(buf);
*--p = '\0';
while (mindig-- > 0 || value) {
unsigned char digit = value % base;
digit += (digit >= 10) ? ('a'-10) : '0';
*--p = digit;
value /= base;
}
__putstr(p);
}
void __puthex(unsigned long value)
{
char alpha[2] = "0";
int bits;
__putnum(value, 16, sizeof(value)*2);
}
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);
}
void __putdec(unsigned long value)
{
__putnum(value, 10, 1);
}
#ifdef CONFIG_X86_NEED_RELOCS

2
arch/x86/boot/compressed/misc.h
View file

@ -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