[commit] r1363 - trunk/openbios-devel/arch/sparc64

[repository service]

Author: mcayland
Date: Tue Dec 29 16:50:36 2015
New Revision: 1363
URL: http://tracker.coreboot.org/trac/openbios/changeset/1363

Log:
SPARC64: move client interface stack inline to the new Forth context stack

Rather than having a separate OpenBIOS stack for client interface calls, reuse
the Forth stack by reserving 8K extra beneath the CPU save state area and
using that instead.

Signed-off-by: Mark Cave-Ayland

Modified:
   trunk/openbios-devel/arch/sparc64/call-client.S

Modified: trunk/openbios-devel/arch/sparc64/call-client.S
==============================================================================
--- trunk/openbios-devel/arch/sparc64/call-client.S	Tue Dec 29 16:50:34 2015	(r1362)
+++ trunk/openbios-devel/arch/sparc64/call-client.S	Tue Dec 29 16:50:36 2015	(r1363)
@@ -148,9 +148,6 @@
    .data
    .align	8

-	.skip	16384
-openbios_stack:
-
 client_stack:
    .xword	0
 client_tba:
@@ -200,8 +197,15 @@
    
    SAVE_WINDOW_STATE(cif)

-	/* Move to OpenBIOS stack */
-	setx	openbios_stack - 2047 - 192, %g6, %g7
+	/* Move to OpenBIOS context stack */
+	setx	_fcstack_ptr, %g6, %g7
+	ldx	[%g7], %g6
+	setx	0x2000, %g4, %g5
+	sub	%g6, %g5, %g6
+	stx	%g6, [%g7]
+	
+	setx	- 2047 - 192, %g6, %g7
+	add	%g1, %g7, %g7
    mov	%g7, %sp

/* Call client inteface */
@@ -211,6 +215,9 @@
    /* Restore windows */
    setx	_fcstack_ptr, %g6, %g7
    ldx	[%g7], %g1
+	setx	0x2000, %g4, %g5
+	add	%g1, %g5, %g1
+	stx	%g1, [%g7]
    
    /* Return value */
    stx	%o0, [%g1 + 0x30]