Documentation of kernel API

doc/syscalls.md

@@ -395,7 +395,7 @@ specific error.
 
 Arguments:
  - `C`: `0x16`
- - `X`: File handle
+ - `X`: File handle
  - `Y`: File attribute bitmask
 
 Return Values:
@@ -410,3 +410,28 @@ Return Values:
  - `FILE_ARCHIVE`
 
  Passing `0x0000` in the `Y` register will clear all attributes.
+
+ ## `0x17`: Get Current Directory
+
+ Arguments:
+ - `C`: `0x17`
+ - `X`: Bank of string
+ - `Y`: Address of string
+
+Return Values:
+ - `C`: Status code
+
+Argument Structure:
+
+```
+    struct {
+        char *drive; // The volume name of the drive to check
+        char *dest; // Buffer for the returned directory path
+    };
+```
+
+This call attempts to create a `NULL`-terminated string with the path of
+the current directory in the drive with the volume name specified in the
+`drive` argument, and puts that string into the buffer pointed to by
+`dest`. On success, `C` will contain `STATUS_OK`. On failure, `C` will
+containe a negative value indicating the error type.