core: clean up the call to disk_init()

Move direct references to registers up as far as possible to make the
code easier to read.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/core/fs.c b/core/fs.c
index fc93685..81bda51 100644 (file)
--- a/core/fs.c
+++ b/core/fs.c
@@ -166,7 +166,11 @@ void close_file(com32sys_t *regs)
  */
 void fs_init(com32sys_t *regs)
 {
-    sector_t part_offset = regs->ecx.l | ((sector_t)regs->ebx.l << 32);
+    uint8_t disk_devno = regs->edx.b[0];
+    uint8_t disk_cdrom = regs->edx.b[1];
+    sector_t disk_offset = regs->ecx.l | ((sector_t)regs->ebx.l << 32);
+    uint16_t disk_heads = regs->esi.w[0];
+    uint16_t disk_sectors = regs->edi.w[0];
     int blk_shift = -1;
     struct device *dev = NULL;
     /* ops is a ptr list for several fs_ops */
@@ -181,13 +185,12 @@ void fs_init(com32sys_t *regs)
         * with FS_DEV filesystems...
         */
        if (fs.fs_ops->fs_flags & FS_NODEV) {
-               fs.fs_dev = NULL;
+           fs.fs_dev = NULL;
        } else {
-               if (!dev)
-                       dev = device_init(regs->edx.b[0], regs->edx.b[1],
-                                         part_offset,
-                                         regs->esi.w[0], regs->edi.w[0]);
-               fs.fs_dev = dev;
+           if (!dev)
+               dev = device_init(disk_devno, disk_cdrom, disk_offset,
+                                 disk_heads, disk_sectors);
+           fs.fs_dev = dev;
        }
        /* invoke the fs-specific init code */
        blk_shift = fs.fs_ops->fs_init(&fs);