Re: Savannah task 5878 - port user_gdt

[Samuel Thibault]

Hi,

Barry deFreese, le Sat 04 Nov 2006 20:14:08 -0500, a écrit :
> I have an improved patch that does work and has been moderately
> tested.

--- ChangeLog   4 Nov 2006 23:32:21 -0000       1.128.2.159
+++ ChangeLog   5 Nov 2006 01:04:41 -0000
@@ -1,3 +1,15 @@
+        * i386/i386/gdt.h (USER_GDT, USER_GDT_SLOTS): New macros.

You should also note that GDTSZ got modified too.

+        * i386/i386/thread.h (struct i386_machine_state): New member user_gdt.

And that gdt.h is included.

+        * Thanks to Samuel Thibault for fix ups and testing!

Not needed :)

--- i386/i386/gdt.h     4 Nov 2006 23:32:21 -0000       1.2.2.1
+++ i386/i386/gdt.h     5 Nov 2006 01:05:01 -0000
@@ -49,8 +49,9 @@
 #define        USER_FPREGS     0x40            /* user-mode access to saved
                                           floating-point registers */
 
-#define        GDTSZ           11
-
+#define        GDTSZ           13
+#define USER_GDT       0x48
+#define USER_GDT_SLOTS 2

You should define GDTSZ after USER_GDT and USER_GDT_SLOTS, and GDTSZ
should then rather be (USER_GDT/8 + USER_GDT_SLOTS)
 
Index: linux/src/include/linux/head.h
===================================================================
RCS file: /cvsroot/hurd/gnumach/linux/src/include/linux/Attic/head.h,v
retrieving revision 1.1
diff -u -r1.1 head.h
--- linux/src/include/linux/head.h      26 Apr 1999 05:56:28 -0000      1.1
+++ linux/src/include/linux/head.h      5 Nov 2006 01:05:03 -0000
@@ -5,7 +5,10 @@
        unsigned long a,b;
 } desc_table[256];
 
-extern desc_table idt,gdt;
+/* XXX Linux code doesn't use idt/gdt? */
+/*
+ * extern desc_table idt,gdt;
+ */
 
They shouldn't ever use idt/gdt directly.

Samuel