Fix building C code for 32 bit mode; BIOS string printing

Qcommon.c

@@ -1,4 +1,8 @@
-#include <stdint.h>
+//#include <stdint.h>
+
+typedef unsigned char uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned int uint32_t;
 
 #define COM1_BASE_PORT 0x3F8
 
@@ -35,15 +39,14 @@ void serial_write(const char *msg)
 	}
 }
 
-extern void writechar();
+extern void bios_write(const char *msg, unsigned length);
 
 void
 main()
 {
-	serial_write("init\r\n");
-	writechar();
-	serial_write("foo\r\n");
+	bios_write("init\r\n", 6);
+	bios_write("karlos\r\n", 8);
 	for (;;) {
-		//__asm__ ("hlt" :);
+		__asm__ ("hlt" :);
 	}
 }

Rnbp.S

@@ -71,15 +71,6 @@ _start:     cli
             mov         %ss, %ax
             mov         %ax, real_ss
 
-            push        $msg_start
-            call        dbgmsg
-            add         $2, %sp
-
-            xor         %bx, %bx
-            mov         $0x0E, %ah
-            mov         $'B', %al
-            int         $0x10
-
             // initialize our own BSS section
             mov         $_bss_start, %di
             mov         $_bss_end, %cx
@@ -133,22 +124,38 @@ dbgmsg:     push        %bp
             pop         %bp
             ret
 
-            .global     writechar
+            .global     bios_write
             .code32
-writechar:  push        %ebp
+bios_write: push        %ebp
             mov         %esp, %ebp
             push        %ebx
 
+            mov         8+0(%ebp), %edx
+            mov         8+4(%ebp), %ecx
+
             PROT16
             .code16
             REAL
 
+.bwloop:    test        %ecx, %ecx
+            jz          .bwreturn
+
             xor         %bx, %bx
             mov         $0x0E, %ah
-            mov         $'A', %al
-            int         $0x10
+            mov         (%edx), %al
 
-            PROT
+            push        %ecx
+            push        %edx
+            int         $0x10
+            pop         %edx
+            pop         %ecx
+
+            add         $1, %edx
+            sub         $1, %ecx
+
+            jmp         .bwloop
+
+.bwreturn:  PROT
             PROT32
             .code32
 
@@ -176,7 +183,8 @@ GDT:        // entry 0: null descriptor
             // TODO: 32-bit TSS
             .set        GDT_SIZE, . - GDT
 GDT_PTR:    .word       GDT_SIZE - 1
-            .quad       GDT
+            .word       GDT
+            .word       0, 0, 0
 
 msg_start:  .asciz      "Netboot via fernlader v2 ...\r\n"
 msg_a20:    .asciz      " * Enabling A20 Gate\r\n"

config.mk

@@ -1,5 +1,7 @@
-CC = cc
+#CC = /usr/local/x86_64-karlos-toolchain/bin/x86_64-karlos-gcc
+#LD = /usr/local/x86_64-karlos-toolchain/bin/x86_64-karlos-ld
+CC = gcc
 LD = ld
 
-CFLAGS = -no-pie -fno-pic -fno-stack-protector
-LDFLAGS = -Tfernlader.ld
+CFLAGS = -no-pie -fno-pic -fno-stack-protector -nostdinc -m32
+LDFLAGS = -Tfernlader.ld -m elf_i386