[xtensa-cvscommit] linux/arch/xtensa/kernel vectors.S,1.2,1.3

[<joe...@us...>]

Update of /cvsroot/xtensa/linux/arch/xtensa/kernel
In directory sc8-pr-cvs1:/tmp/cvs-serv4000/arch/xtensa/kernel

Modified Files:
	vectors.S 
Log Message:

Documentation clarifications only.


Index: vectors.S
===================================================================
RCS file: /cvsroot/xtensa/linux/arch/xtensa/kernel/vectors.S,v
retrieving revision 1.2
retrieving revision 1.3
diff -C2 -d -r1.2 -r1.3
*** vectors.S	11 Nov 2002 22:25:25 -0000	1.2
--- vectors.S	27 Nov 2002 21:42:11 -0000	1.3
***************
*** 139,142 ****
--- 139,145 ----
  	 * suitable for immediate transfer of control to
  	 * handle_double, where "normal" exception processing occurs.
+ 	 * Also in kernel mode, TLB misses can occur if accessing
+ 	 * vmalloc memory, possibly requiring repair in a double
+ 	 * exception handler.
  	 *
  	 * The variable at TABLE_FIXUP offset from the pointer in
***************
*** 167,176 ****
  
  	/* The double exception did occur within a window exception
! 	 * handler.  The registered handler expects the following:
  	 *
  	 *	a0 is undefined
  	 *	DEPC contains original a0
  	 *	DEPC saved in [ EXCSAVE_1 + TABLE_SAVEA0 ]
! 	 *	All other register contain their original values.
  	 */
  
--- 170,197 ----
  
  	/* The double exception did occur within a window exception
! 	 * handler.  All entry conditions below say "All other
! 	 * registers contain their original values."  These values
! 	 * usually are not user values, but kernel values, since
! 	 * the double exception will return to the kernel handler,
! 	 * not the user code.
! 	 *
! 	 * find_handler has some entry conditions, but these are met
! 	 * by the Double Exception Vector code, not the routines that
! 	 * register find_handler with TABLE_FIXUP.  They are:
! 	 *
! 	 *	a0 is undefined
! 	 *	a1 = &exception_handlers[0]
! 	 *	EXCSAVE_1 contains original a1
! 	 *	a2 is undefined
! 	 *	[ EXCSAVE_1 + TABLE_SAVEA2 ] contains original a2
! 	 *	All other registers contain their original values.
! 	 *
! 	 * We setup the following conditions for the registered
! 	 * handler:
  	 *
  	 *	a0 is undefined
  	 *	DEPC contains original a0
  	 *	DEPC saved in [ EXCSAVE_1 + TABLE_SAVEA0 ]
! 	 *	All other registers contain their original values.
  	 */