syscalls: munmap

src/arch/x86_64/syscall.asm

@@ -27,7 +27,8 @@ extern syscall_chdir
 extern syscall_fstatat
 extern syscall_pipe2
 extern syscall_mkdir
-func_count equ 26
+extern syscall_munmap
+func_count equ 27
 
 
 func_table:
@@ -57,6 +58,7 @@ func_table:
 	dq syscall_fstatat
 	dq syscall_pipe2
 	dq syscall_mkdir
+	dq syscall_munmap
 section .text
 global asm_syscall_entry
 

src/sys/mm/vmm.c

@@ -513,10 +513,12 @@ bool vmm_unmap(void* addr, size_t pagec){
 	
 	spinlock_acquire(lock);
 
-	unmap(start, addr, pagec);
+	bool ret = unmap(start, addr, pagec);
 
 	spinlock_release(lock);
 
+	return ret;
+
 }
 
 bool vmm_setused(void* addr, size_t pagec, size_t mmuflags){

src/sys/syscalls/munmap.c

@@ -0,0 +1,32 @@
+#include <kernel/vmm.h>
+#include <kernel/syscalls.h>
+#include <arch/cls.h>
+
+syscallret syscall_munmap(void* addr, size_t length){
+	
+	syscallret retv;
+	retv.ret = -1;
+
+	if(length == 0 || length % PAGE_SIZE > 0){
+		retv.errno = EINVAL;
+		return retv;
+	}
+
+	if(addr > USER_SPACE_END){
+		retv.errno = EFAULT;
+		return retv;
+	}
+	
+	bool res = vmm_unmap(addr, length / PAGE_SIZE);
+
+	retv.ret = 0;
+	retv.errno = 0;
+
+	if(!res){
+		retv.errno = ENOMEM;
+		retv.ret = -1;
+	}
+	
+	return retv;
+	
+}