spectranext: implement missing support for umount

Author: desertkun

peripherals/fs/xfs.c

@@ -702,6 +702,38 @@ void xfs_handle_lseek(struct xfs_registers_t* registers)
     }
 }
 
+void xfs_handle_umount(struct xfs_registers_t* registers)
+{
+    const int mount_point = registers->mount_point;
+
+    if (mount_point < 0 || mount_point >= 4)
+    {
+        XFS_DEBUG("xfs: umount failed: invalid mount_point=%d\n", mount_point);
+        registers->result = XFS_ERR_INVAL;
+        registers->status = XFS_STATUS_ERROR;
+        return;
+    }
+
+    if (xfs_mounted_engines[mount_point].engine == NULL)
+    {
+        XFS_DEBUG("xfs: umount mount_point=%d (already idle)\n", mount_point);
+        registers->result = 0;
+        registers->status = XFS_STATUS_COMPLETE;
+        return;
+    }
+
+    struct xfs_engine_t* const eng = xfs_mounted_engines[mount_point].engine;
+    if (eng->unmount)
+        eng->unmount(eng, &xfs_mounted_engines[mount_point]);
+
+    xfs_mounted_engines[mount_point].engine = NULL;
+
+    XFS_DEBUG("xfs: umount success mount_point=%d\n", mount_point);
+    registers->result = 0;
+    registers->status = XFS_STATUS_COMPLETE;
+}
+
+
 /**
  * Handle XFS command dispatch
  * This function processes a command from the registers and dispatches to the appropriate handler
@@ -799,6 +831,11 @@ void xfs_handle_command(struct xfs_registers_t* registers)
                 xfs_handle_lseek(registers);
                 break;
             }
+            case XFS_CMD_UNMOUNT:
+            {
+                xfs_handle_umount(registers);
+                break;
+            }
             default:
             {
                 XFS_DEBUG("xfs: unknown command=%d\n", command);

peripherals/fs/xfs.h

@@ -65,6 +65,7 @@ enum xfs_whence_flags {
 #define XFS_CMD_GETCWD (14)
 #define XFS_CMD_RENAME (15)
 #define XFS_CMD_LSEEK (16)
+#define XFS_CMD_UNMOUNT (17)
 
 #define XFS_STATUS_IDLE (0)
 #define XFS_STATUS_BUSY (1)
@@ -303,6 +304,7 @@ extern bool xfs_debug_is_enabled(void);
 extern void xfs_handle_command(struct xfs_registers_t* registers);
 extern void xfs_free(void);
 extern void xfs_handle_mount(struct xfs_registers_t* registers);
+extern void xfs_handle_umount(struct xfs_registers_t* registers);
 
 // Mounted engines array (shared between task and emulator)
 extern struct xfs_engine_mount_t xfs_mounted_engines[4];