Some things (still doesn't compile)

.gitignore

@@ -1,3 +1,3 @@
 build/
-.mailmap
+*.err
 .vscode

src/bootloader/stage2/stdio.c

@@ -232,8 +232,8 @@ int *printf_number(int *argp, int length, bool sign, int radix)
     // convert number to ASCII
     do
     {
-        uint32_t rem;
-        x86_div64_32(number, radix, &number, &rem);
+        uint32_t rem = number % radix;
+        number = number / radix;
         buffer[pos++] = g_HexChars[rem];
     } while (number > 0);
 

src/bootloader/stage2/x86.asm

@@ -21,3 +21,7 @@ _x86_Video_WriteCharTeletype:
     pop bp
 
     ret
+
+global _x86_div64_32
+
+_x86_div64_32:

src/bootloader/stage2/x86.h

@@ -2,3 +2,4 @@
 #include "stdint.h"
 
 void _cdecl x86_Video_WriteCharTeletype(char c, uint8_t page);
+void _cdecl x86_div64_32(uint64_t dividend, uint32_t divisor, uint64_t *quotientOut, uint64_t *remainderOut);