add mmap unmmap

Makefile

@@ -175,6 +175,7 @@ UPROGS=\
 	$U/_grind\
 	$U/_wc\
 	$U/_zombie\
+	$U/_mmaptest\
 
 
 

kernel/syscall.c

@@ -104,6 +104,8 @@ extern uint64 sys_unlink(void);
 extern uint64 sys_wait(void);
 extern uint64 sys_write(void);
 extern uint64 sys_uptime(void);
+extern uint64 sys_mmap(void);
+extern uint64 sys_munmap(void);
 
 static uint64 (*syscalls[])(void) = {
 [SYS_fork]    sys_fork,
@@ -127,6 +129,9 @@ static uint64 (*syscalls[])(void) = {
 [SYS_link]    sys_link,
 [SYS_mkdir]   sys_mkdir,
 [SYS_close]   sys_close,
+[SYS_mmap]   sys_mmap,
+[SYS_munmap]   sys_munmap,
+
 };
 
 void

kernel/syscall.h

@@ -20,3 +20,5 @@
 #define SYS_link   19
 #define SYS_mkdir  20
 #define SYS_close  21
+#define SYS_mmap   22
+#define SYS_munmap 23
\ No newline at end of file

kernel/sysproc.c

@@ -95,3 +95,18 @@ sys_uptime(void)
   release(&tickslock);
   return xticks;
 }
+
+uint64
+sys_mmap(void)
+{
+  
+  return 0;
+}
+
+uint64
+sys_munmap(void)
+{
+  return 0;
+}
+
+

user/user.h

@@ -23,6 +23,8 @@ int getpid(void);
 char* sbrk(int);
 int sleep(int);
 int uptime(void);
+char* mmap( char* addr, int len, int prot, int flags,int fd, int off);
+int munmap( char* addr , int len );
 
 // ulib.c
 int stat(const char*, struct stat*);

user/usys.pl

@@ -36,3 +36,5 @@ entry("getpid");
 entry("sbrk");
 entry("sleep");
 entry("uptime");
+entry("mmap");
+entry("munmap");