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Subject: [PATCH 1/2] x86/boot: Add error_putdec() helper
Thread-Topic: [PATCH 1/2] x86/boot: Add error_putdec() helper
Thread-Index: AQHaVYsi/1oB6HDI3k25PP/X1Nkmaw==
Date: Fri, 2 Feb 2024 03:51:43 +0000
Message-ID: <20240202035052.17963-1-junichi.nomura@nec.com>
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From: "H. Peter Anvin" <hpa@zytor.com>

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>
Link: https://lore.kernel.org/lkml/20240123112624.GBZa-iYP1l9SSYtr-V@fat_cr=
ate.local/

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/mis=
c.c
--- 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);
 }
=20
-void __puthex(unsigned long value)
+static noinline void __putnum(unsigned long value, unsigned int base,
+			      int mindig)
 {
-	char alpha[2] =3D "0";
-	int bits;
+	char buf[8*sizeof(value)+1];
+	char *p;
=20
-	for (bits =3D sizeof(value) * 8 - 4; bits >=3D 0; bits -=3D 4) {
-		unsigned long digit =3D (value >> bits) & 0xf;
+	p =3D buf + sizeof(buf);
+	*--p =3D '\0';
=20
-		if (digit < 0xA)
-			alpha[0] =3D '0' + digit;
-		else
-			alpha[0] =3D 'a' + (digit - 0xA);
+	while (mindig-- > 0 || value) {
+		unsigned char digit =3D value % base;
+		digit +=3D (digit >=3D 10) ? ('a'-10) : '0';
+		*--p =3D digit;
=20
-		__putstr(alpha);
+		value /=3D base;
 	}
+
+	__putstr(p);
+}
+
+void __puthex(unsigned long value)
+{
+	__putnum(value, 16, sizeof(value)*2);
+}
+
+void __putdec(unsigned long value)
+{
+	__putnum(value, 10, 1);
 }
=20
 #ifdef CONFIG_X86_NEED_RELOCS
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/mis=
c.h
--- 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)
=20
 #ifdef CONFIG_X86_VERBOSE_BOOTUP
 =