srg-ics-uplb/ics-os

An instructional operating system

ics-os's Issues

How to do file i/o in kernel mode?

Here's a demo:

void kernel_file_io_demo(){
   char msg[10]="Hello!";
   char buf[10];
   file_PCB *fp;

   fp=openfilex("sample.txt",FILE_WRITE);
   fwrite(msg,sizeof(msg),1,fp);
   fclose(fp);

   fp=openfilex("sample.txt",FILE_READ);
   fread(buf,sizeof(msg),1,fp);
   printf("%s\n",buf);
   fclose(fp);

}

ICS OS fails to compile in the GNU C Compiler versions 5.0 and above

ICS OS fails to compile in the GNU C Compiler versions 5.0 and above.

The linker seems to be unable to find references to inline functions.

The following is the output in the terminal when running make:

make -C kernel/
make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
make[1]: Entering directory '/home/skeithc/Codes/C/ics-os2/ics-os/kernel'
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o scheduler.o process/scheduler.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o fat.o filesystem/fat12.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o iso9660.o filesystem/iso9660.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o devfs.o filesystem/devfs.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o iomgr.o iomgr/iosched.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o devmgr_error.o devmgr/devmgr_error.c
gcc -m32 -w -nostdlib -fno-builtin -ffreestanding -c -o kernel32.o kernel32.c 
nasm -f elf32 -o startup.o startup/startup.asm
nasm -f elf32 -o asmlib.o startup/asmlib.asm 
startup/asmlib.asm:300: warning: label alone on a line without a colon might be in error
nasm -f elf32 -o irqwrap.o irqwrap.asm
strip --strip-debug *.o
ld -melf_i386  -T lscript.txt -Map mapfile.txt

kernel32.o: In function `ports_write':
(.text+0x16e): undefined reference to `outportw'
kernel32.o: In function `ports_read':
(.text+0x1f0): undefined reference to `inportw'
kernel32.o: In function `read_regs':
(.text+0x2e6): undefined reference to `inportb'
kernel32.o: In function `read_regs':
(.text+0x311): undefined reference to `outportb'
kernel32.o: In function `read_regs':
(.text+0x321): undefined reference to `inportb'
kernel32.o: In function `read_regs':
(.text+0x356): undefined reference to `outportb'
kernel32.o: In function `read_regs':
(.text+0x366): undefined reference to `inportb'
kernel32.o: In function `read_regs':
(.text+0x39b): undefined reference to `outportb'
...
Makefile:47: recipe for target 'Kernel32.bin' failed
make[1]: *** [Kernel32.bin] Error 1
make[1]: Leaving directory '/home/skeithc/Codes/C/ics-os2/ics-os/kernel'
Makefile:7: recipe for target 'vmdex' failed
make: *** [vmdex] Error 2