enable the support of the system call "fork"

remove obsolete file

arch/x86/kernel/schedule.asm

@@ -1,147 +0,0 @@
-; 
-; Copyright 2010 Stefan Lankes, Chair for Operating Systems,
-;                               RWTH Aachen University
-;
-; Licensed under the Apache License, Version 2.0 (the "License");
-; you may not use this file except in compliance with the License.
-; You may obtain a copy of the License at
-;
-;     http://www.apache.org/licenses/LICENSE-2.0
-;
-; Unless required by applicable law or agreed to in writing, software
-; distributed under the License is distributed on an "AS IS" BASIS,
-; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-; See the License for the specific language governing permissions and
-; limitations under the License.
-;
-; This file is part of metalsvm.
-
-[BITS 32]
-SECTION .code
-extern get_new_task
-extern current_task
-;extern task_table
-
-; C prototyp:
-;
-; typedef struct {
-;        unsigned char* top;
-;        unsigned int ip;
-;        tid_t id; 
-;        ...
-; } task_t;
-
-; After an interrupt, the original return address has to be pushed 
-; on the stack because we want to comeback...
-global schedule_entry
-schedule_entry:
-    cli
-    sub esp, 4	; add some space for the return address,
-		; which is stored in current_task->ip
-
-    pushfd
-    pusha
-    push ds
-    push es
-    push fs
-    push gs
-
-    mov ax, 0x10
-    mov ds, ax
-    mov es, ax
-    mov fs, ax
-    mov gs, ax
-
-    ;mov eax, DWORD [current_id]
-    ;shl eax, 0x4                        ; 16 = sizeof(task_t)
-    ;mov edx, DWORD [eax+task_table+4]
-    ;mov [esp+13*4], edx
-    ;mov DWORD [eax+task_table+4], 0
-    mov eax, DWORD [current_task]
-    mov edx, [eax+4]
-    mov DWORD [esp+13*4], edx
-    mov DWORD [eax+4], 0x00
-
-    jmp L1
-
-; Scheduler, which switches to the new tasks
-global schedule
-schedule:
-    ret
-
-    cli
-    ; return address is already on the stack (via call schedule)
-    pop eax
-    pushfd
-    push 0x08
-    push eax
-    push byte 0
-    push byte 32
-    pusha
-    push ds
-    push es
-    push fs
-    push gs
-
-    mov ax, 0x10
-    mov ds, ax
-    mov es, ax
-    mov fs, ax
-    mov gs, ax
-
-    mov eax, DWORD [current_task]
-    mov [eax], esp
-
-    ;call get_new_task
-
-    mov DWORD [current_task], eax
-    mov esp, [eax]
-
-    pop gs
-    pop fs
-    pop es
-    pop ds
-    popa
-    add esp, 8
-    xor eax, eax ; return value is 0
-    iret
-
-    cli
-    pushfd
-    pusha
-    push ds
-    push es
-    push fs
-    push gs
-
-    mov ax, 0x10
-    mov ds, ax
-    mov es, ax
-    mov fs, ax
-    mov gs, ax
-
-    ; store current esp
-    ;mov eax, DWORD [current_id]
-    ;shl eax, 0x4			; 16 = sizeof(task_t)
-L1:
-    ;mov [eax+task_table], esp
-    mov eax, DWORD [current_task]
-    mov [eax], esp
-
-    ;call get_new_task
-
-    ; set current task and restore esp
-    ;mov DWORD [current_id], eax
-    ;shl eax, 0x4                        ; 16 = sizeof(task_t)
-    ;mov esp, [eax+task_table]
-    mov DWORD [current_task], eax
-    mov esp, [eax]
-
-    pop gs
-    pop fs
-    pop es
-    pop ds
-    popa
-    popfd
-    sti
-    ret

newlib/examples/tests.c

@@ -34,7 +34,7 @@ int main(int argc, char** argv)
 
 	printf("Create child process...\n");
 
-	pid = 42; //fork();
+	pid = fork();
 	if (pid == 0) { // child
 		char* newargs[] = {"/bin/hello", "one", "two", "three", NULL};
 		char* newenv[] = {"USER=root", "PATH=/bin:/sbin:/usr/bin", "PWD=/", "TEMP=/tmp", NULL};