[commit] r1366 - trunk/openbios-devel/arch/sparc64

[repository service]

Author: mcayland
Date: Tue Dec 29 16:50:44 2015
New Revision: 1366
URL: http://tracker.coreboot.org/trac/openbios/changeset/1366

Log:
SPARC64: rearrange saved state window order

Instead of storing the windows in numerical order, store them starting
from %cwp. This means the current window can be located at a fixed point
in the state, rather than calculating the offset based upon %cwp.

Signed-off-by: Mark Cave-Ayland

Modified:
   trunk/openbios-devel/arch/sparc64/cpustate.h

Modified: trunk/openbios-devel/arch/sparc64/cpustate.h
==============================================================================
--- trunk/openbios-devel/arch/sparc64/cpustate.h	Tue Dec 29 16:50:41 2015	(r1365)
+++ trunk/openbios-devel/arch/sparc64/cpustate.h	Tue Dec 29 16:50:44 2015	(r1366)
@@ -72,11 +72,15 @@
    /* Get the number of windows in %g6 */ \
    rdpr	%ver, %g6; \
    and	%g6, 0xf, %g6; \
-	inc	%g6; \
+	\
+	mov     %g6, %g4; \
+	inc     %g4; \
+	\
+	/* Starting cwp in g7 */ \
+	rdpr    %cwp, %g7; \
    \
 save_cpu_window_##type: \
-	deccc	%g6; \
-	wrpr	%g6, %cwp; \
+	wrpr    %g7, %cwp; \
    stx	%l0, [%g5]; \
    stx	%l1, [%g5 + 0x8]; \
    stx	%l2, [%g5 + 0x10]; \
@@ -93,6 +97,9 @@
    stx	%i5, [%g5 + 0x68]; \
    stx	%i6, [%g5 + 0x70]; \
    stx	%i7, [%g5 + 0x78]; \
+	dec	%g7; \
+	and	%g7, %g6, %g7; \
+	subcc	%g4, 1, %g4; \
    bne	save_cpu_window_##type; \
     add	%g5, 0x80, %g5; \
    \
@@ -144,14 +151,18 @@
    /* Get the number of windows in %g6 */ \
    rdpr	%ver, %g6; \
    and	%g6, 0xf, %g6; \
-	inc	%g6; \
+	\
+	mov	%g6, %g4; \
+	inc	%g4; \
+	\
+	/* Set starting window */ \
+	ldx	[%g1], %g7; \
    \
    /* Now iterate through all of the windows restoring all l and i registers */ \
    add	%g1, 0x90, %g5; \
    \
 restore_cpu_window_##type: \
-	deccc	%g6; \
-	wrpr	%g6, %cwp; \
+	wrpr	%g7, %cwp; \
    ldx	[%g5], %l0; \
    ldx	[%g5 + 0x8], %l1; \
    ldx	[%g5 + 0x10], %l2; \
@@ -168,6 +179,9 @@
    ldx	[%g5 + 0x68], %i5; \
    ldx	[%g5 + 0x70], %i6; \
    ldx	[%g5 + 0x78], %i7; \
+	dec	%g7; \
+	and	%g7, %g6, %g7; \
+	subcc	%g4, 1, %g4; \
    bne	restore_cpu_window_##type; \
     add	%g5, 0x80, %g5; \
    \