ppc4xx: Clean up 440 exceptions handling

- Introduced dedicated switches for building 440 and 405 images required
  for 440-specific machine instructions like 'rfmci' etc.

- Exception vectors moved to the proper location (_start moved away from
  the critical exception handler space, which it occupied)

- CriticalInput now serviced (with default handler)

- MachineCheck properly serviced (added a dedicated handler and return
  subroutine)

- Overall cleanup of exceptions declared with STD_EXCEPTION macro (unused,
  unhandled and those not relevant for 4xx were eliminated)

- Eliminated Linux leftovers, removed dead code

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
Signed-off-by: Rafal Jaworowski <raj@semihalf.com>
Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/ppc405.h b/include/ppc405.h
index 71ad12e..6be2a50 100644
--- a/include/ppc405.h
+++ b/include/ppc405.h
@@ -27,6 +27,15 @@
 /*--------------------------------------------------------------------- */
 	#define  srr2  0x3de      /* save/restore register 2 */
 	#define  srr3  0x3df      /* save/restore register 3 */
+
+	/*
+	 * 405 does not really have CSRR0/1 but SRR2/3 are used during critical
+	 * exception for the exact same purposes - let's alias them and have a
+	 * common handling in crit_return() and CRIT_EXCEPTION
+	 */
+	#define  csrr0 srr2
+	#define  csrr1 srr3
+
 	#define  dbsr  0x3f0      /* debug status register */
 	#define  dbcr0 0x3f2      /* debug control register 0 */
 	#define  dbcr1 0x3bd      /* debug control register 1 */