support read() and write() bigger than one page

1 files changed, 29 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index f1558d0..e9aec5d 100644
--- a/proc.c
+++ b/proc.c
@@ -526,3 +526,32 @@ kill(int pid)
 }
 
 #endif
+
+// Copy to either a user address, or kernel address,
+// depending on usr_dst.
+// Returns 0 on success, -1 on error.
+int
+either_copyout(int user_dst, uint64 dst, char *src, uint64 len)
+{
+  struct proc *p = myproc();
+  if(user_dst){
+    return copyout(p->pagetable, dst, src, len);
+  } else {
+    memmove((char *)dst, src, len);
+  }
+}
+
+// Copy from either a user address, or kernel address,
+// depending on usr_src.
+// Returns 0 on success, -1 on error.
+int
+either_copyin(char *dst, int user_src, uint64 src, uint64 len)
+{
+  struct proc *p = myproc();
+  if(user_src){
+    return copyin(p->pagetable, dst, src, len);
+  } else {
+    memmove(dst, (char*)src, len);
+  }
+}
+