[src/trunk]: src/sys/arch/mips/include Add macro for MIPS_PHYS_MASK and docu...

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

details:   https://anonhg.NetBSD.org/src/rev/346bccbd3785
branches:  trunk
changeset: 479929:346bccbd3785
user:      castor <castor%NetBSD.org@localhost>
date:      Mon Dec 27 20:05:06 1999 +0000

description:
Add macro for MIPS_PHYS_MASK  and document use of bits in system status
registers.

diffstat:

 sys/arch/mips/include/cpuregs.h |  10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diffs (32 lines):

diff -r 67fa8a51252f -r 346bccbd3785 sys/arch/mips/include/cpuregs.h
--- a/sys/arch/mips/include/cpuregs.h   Mon Dec 27 18:49:20 1999 +0000
+++ b/sys/arch/mips/include/cpuregs.h   Mon Dec 27 20:05:06 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpuregs.h,v 1.25 1999/12/22 04:54:15 jun Exp $ */
+/*     $NetBSD: cpuregs.h,v 1.26 1999/12/27 20:05:06 castor Exp $      */
 
 /*
  * Copyright (c) 1992, 1993
@@ -81,9 +81,11 @@
 #define MIPS_MAX_MEM_ADDR              0xbe000000
 #define MIPS_RESERVED_ADDR             0xbfc80000
 
-#define MIPS_KSEG0_TO_PHYS(x)  ((unsigned)(x) & 0x1fffffff)
+#define MIPS_PHYS_MASK                 0x1fffffff
+
+#define MIPS_KSEG0_TO_PHYS(x)  ((unsigned)(x) & MIPS_PHYS_MASK)
 #define MIPS_PHYS_TO_KSEG0(x)  ((unsigned)(x) | MIPS_KSEG0_START)
-#define MIPS_KSEG1_TO_PHYS(x)  ((unsigned)(x) & 0x1fffffff)
+#define MIPS_KSEG1_TO_PHYS(x)  ((unsigned)(x) & MIPS_PHYS_MASK)
 #define MIPS_PHYS_TO_KSEG1(x)  ((unsigned)(x) | MIPS_KSEG1_START)
 
 /* Map virtual address to index in mips3 r4k virtually-indexed cache */
@@ -309,7 +311,7 @@
 /* Secondary Cache - 0: present, 1: not present */
 #define MIPS3_CONFIG_SC                0x00020000
 
-/* System Port width - 0: 64-bit, 1,2,3: reserved */
+/* System Port width - 0: 64-bit, 1: 32-bit (QED RM523x), 2,3: reserved */
 #define MIPS3_CONFIG_EW_MASK   0x000c0000
 #define MIPS3_CONFIG_EW_SHIFT  18