Make more efficient clearing interrupts on all processors at boot time.

Without this modification, because of the volatile qualifier, the
compiler does not produce four `` = 0 '' assignments, but code
equivalent to:

	*(volatile uint32_t *)INT_ST_MASK3 = 0;
	*(volatile uint32_t *)INT_ST_MASK2 =
	    *(volatile uint32_t *)INT_ST_MASK3;
	*(volatile uint32_t *)INT_ST_MASK1 =
	    *(volatile uint32_t *)INT_ST_MASK2;
	*(volatile uint32_t *)INT_ST_MASK0 =
	    *(volatile uint32_t *)INT_ST_MASK1;

Anders Gavare reported to Miod Vallat, and he gave me a diff.

diff --git a/sys/arch/luna88k/luna88k/machdep.c b/sys/arch/luna88k/luna88k/machdep.c
index 9501ad8..a2f0949 100644 (file)
--- a/sys/arch/luna88k/luna88k/machdep.c
+++ b/sys/arch/luna88k/luna88k/machdep.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: machdep.c,v 1.134 2020/05/31 06:23:57 dlg Exp $       */
+/*     $OpenBSD: machdep.c,v 1.135 2021/02/23 11:48:21 aoyama Exp $    */
 /*
  * Copyright (c) 1998, 1999, 2000, 2001 Steve Murphree, Jr.
  * Copyright (c) 1996 Nivas Madhur
@@ -995,9 +995,9 @@ luna88k_bootstrap()
        cmmu = &cmmu8820x;
 
        /* clear and disable all interrupts */
-       *(volatile uint32_t *)INT_ST_MASK0 =
-       *(volatile uint32_t *)INT_ST_MASK1 =
-       *(volatile uint32_t *)INT_ST_MASK2 =
+       *(volatile uint32_t *)INT_ST_MASK0 = 0;
+       *(volatile uint32_t *)INT_ST_MASK1 = 0;
+       *(volatile uint32_t *)INT_ST_MASK2 = 0;
        *(volatile uint32_t *)INT_ST_MASK3 = 0;
 
        /* clear software interrupts; just read registers */