[src/trunk]: src/sys/arch/sparc64/sparc64 sun4v: Introduce a new macro ALTERN...

[palle <palle%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/34101d61af3c
branches:  trunk
changeset: 331031:34101d61af3c
user:      palle <palle%NetBSD.org@localhost>
date:      Sun Jul 27 16:37:47 2014 +0000

description:
sun4v: Introduce a new macro ALTERNATE_GLOBALS (matching NORMAL_GLOBALS). Two new helper macros ENABLE_INTERRUPTS and DISABLE_INTERRUPTS are also created. With these changes the GENERIC.UP kernel 
will reach rootmount on sun4v systems - ok martin@

diffstat:

 sys/arch/sparc64/sparc64/locore.s |  41 +++++++++++++++++++++++++++++++++++---
 1 files changed, 37 insertions(+), 4 deletions(-)

diffs (72 lines):

diff -r d86fb24cd0ac -r 34101d61af3c sys/arch/sparc64/sparc64/locore.s
--- a/sys/arch/sparc64/sparc64/locore.s Sun Jul 27 14:24:17 2014 +0000
+++ b/sys/arch/sparc64/sparc64/locore.s Sun Jul 27 16:37:47 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.367 2014/07/26 17:16:41 palle Exp $       */
+/*     $NetBSD: locore.s,v 1.368 2014/07/27 16:37:47 palle Exp $       */
 
 /*
  * Copyright (c) 2006-2010 Matthew R. Green
@@ -159,7 +159,38 @@
        wrpr    %g0, \scratch, %pstate
 3:
        .endm
+
+       .macro  ALTERNATE_GLOBALS scratch
+#ifdef SUN4V
+       sethi   %hi(cputyp), \scratch
+       ld      [\scratch + %lo(cputyp)], \scratch
+       cmp     \scratch, CPU_SUN4V
+       bne,pt  %icc, 2f
+        nop
+       /* sun4v */
+       ba      3f
+        wrpr   %g0, 1, %gl
+2:             
+#endif 
+       /* sun4u */
+       rdpr     %pstate, \scratch
+       or      \scratch, PSTATE_AG, \scratch   ! Alternate Globals (AG) bit set to one
+       wrpr    %g0, \scratch, %pstate
+3:
+       .endm
        
+       .macro  ENABLE_INTERRUPTS scratch
+       rdpr     %pstate, \scratch
+       or      \scratch, PSTATE_IE, \scratch   ! Interrupt Enable (IE) bit set to one
+       wrpr    %g0, \scratch, %pstate
+       .endm
+
+       .macro  DISABLE_INTERRUPTS scratch
+       rdpr     %pstate, \scratch
+       and     \scratch, ~PSTATE_IE, \scratch  ! Interrupt Enable (IE) bit set to zero
+       wrpr    %g0, \scratch, %pstate
+       .endm
+               
 
 #ifdef SUN4V
        /* Misc. sun4v macros */
@@ -3904,10 +3935,12 @@
        !!
        bnz,pn  %icc, 1f                                ! Returning to userland?
         nop
-       wrpr    %g0, PSTATE_INTR, %pstate
+       ENABLE_INTERRUPTS %g5
        wrpr    %g0, %g0, %pil                          ! Lower IPL
 1:
-       wrpr    %g0, PSTATE_KERN, %pstate               ! Make sure we have normal globals & no IRQs
+       !! Make sure we have normal globals & no IRQs
+       DISABLE_INTERRUPTS %g5
+       NORMAL_GLOBALS %g5
 
        /* Restore normal globals */
        ldx     [%sp + CC64FSZ + STKB + TF_G + (1*8)], %g1
@@ -3921,7 +3954,7 @@
 #ifdef TRAPS_USE_IG
        wrpr    %g0, PSTATE_KERN|PSTATE_IG, %pstate     ! DEBUG
 #else
-       wrpr    %g0, PSTATE_KERN|PSTATE_AG, %pstate
+       ALTERNATE_GLOBALS %g7           ! Assuming %g7 is ok to trash
 #endif
        ldx     [%sp + CC64FSZ + STKB + TF_O + (0*8)], %i0
        ldx     [%sp + CC64FSZ + STKB + TF_O + (1*8)], %i1