[src/trunk]: src/sys/arch/mips Use proper "page" alignments for R5k Page Inva...

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

details:   https://anonhg.NetBSD.org/src/rev/835bcc59bd73
branches:  trunk
changeset: 934591:835bcc59bd73
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun Jun 14 15:12:56 2020 +0000

description:
Use proper "page" alignments for R5k Page Invalidate(S) op.  PR/55139

According to NEC "User's Manual VR5000, VR1000 64-BIT MICROPROCESSOR
INSTRUCTION" (U12754EJ1V0UMJ1), R5000 Page Invalidate (S) op does
"a page invalidate by doing a burst of 128 line invalidates to
the secondary cache at the page specified by the effective address
generated by the CACHE instruction, which must be page aligned."

This description looks a bit confusing, but "page" used here
implies fixed 32 byte cacheline * 128 lines == 4096 bytes,
not our variable "PAGE_SIZE" used in VM paging ops.  Note
the current default PAGE_SIZE for MIPS3 has been changed to 8192.

While here, also define and use proper macro for the "page" and CACHEOP
arg for the R5k Page_Invalidate_S op, as the manual also describes
the cache op field 10111 as "Page Invalidate" for the secondary cache.

No visible regression on Cobalt Qube 2700 (Rm5230) through
whole installation using netbsd-9 based Cobalt RestoreCD/USB.

diffstat:

 sys/arch/mips/include/cache_r5k.h   |  12 +++++++++++-
 sys/arch/mips/mips/cache_r5k.c      |  14 ++++----------
 sys/arch/mips/mips/cache_r5k_subr.S |   6 +++---
 3 files changed, 18 insertions(+), 14 deletions(-)

diffs (92 lines):

diff -r 12dee5a763ac -r 835bcc59bd73 sys/arch/mips/include/cache_r5k.h
--- a/sys/arch/mips/include/cache_r5k.h Sun Jun 14 14:45:12 2020 +0000
+++ b/sys/arch/mips/include/cache_r5k.h Sun Jun 14 15:12:56 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cache_r5k.h,v 1.4 2016/07/11 16:15:35 matt Exp $       */
+/*     $NetBSD: cache_r5k.h,v 1.5 2020/06/14 15:12:56 tsutsui Exp $    */
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -61,3 +61,13 @@
 void   r5k_sdcache_wb_range(register_t, vsize_t);
 
 #endif /* _KERNEL && !_LOCORE */
+
+#define CACHEOP_R5K_Page_Invalidate_S   0x17
+
+#define R5K_SC_LINESIZE                32
+#define R5K_SC_PAGESIZE                (R5K_SC_LINESIZE * 128)
+#define R5K_SC_PAGEMASK                (R5K_SC_PAGESIZE - 1)
+
+#define mips_r5k_round_page(x) (((x) + (register_t)R5K_SC_PAGEMASK) \
+                                   & (register_t)R5K_SC_PAGEMASK)
+#define mips_r5k_trunc_page(x) ((x) & (register_t)R5K_SC_PAGEMASK)
diff -r 12dee5a763ac -r 835bcc59bd73 sys/arch/mips/mips/cache_r5k.c
--- a/sys/arch/mips/mips/cache_r5k.c    Sun Jun 14 14:45:12 2020 +0000
+++ b/sys/arch/mips/mips/cache_r5k.c    Sun Jun 14 15:12:56 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cache_r5k.c,v 1.20 2017/04/27 20:05:09 skrll Exp $     */
+/*     $NetBSD: cache_r5k.c,v 1.21 2020/06/14 15:12:56 tsutsui Exp $   */
 
 /*
  * Copyright 2001 Wasabi Systems, Inc.
@@ -36,7 +36,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cache_r5k.c,v 1.20 2017/04/27 20:05:09 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cache_r5k.c,v 1.21 2020/06/14 15:12:56 tsutsui Exp $");
 
 #include <sys/param.h>
 
@@ -407,9 +407,6 @@
 
 __asm(".set mips3");
 
-#define R5K_Page_Invalidate_S   0x17
-CTASSERT(R5K_Page_Invalidate_S == (CACHEOP_R4K_HIT_WB_INV|CACHE_R4K_SD));
-
 void
 r5k_sdcache_wbinv_all(void)
 {
@@ -431,9 +428,6 @@
        r5k_sdcache_wbinv_range((intptr_t)va, size);
 }
 
-#define        mips_r5k_round_page(x)  round_line(x, PAGE_SIZE)
-#define        mips_r5k_trunc_page(x)  trunc_line(x, PAGE_SIZE)
-
 void
 r5k_sdcache_wbinv_range(register_t va, vsize_t size)
 {
@@ -448,8 +442,8 @@
        __asm volatile("mfc0 %0, $28" : "=r"(taglo));
        __asm volatile("mtc0 $0, $28");
 
-       for (; va < eva; va += (128 * 32)) {
-               cache_op_r4k_line(va, CACHEOP_R4K_HIT_WB_INV|CACHE_R4K_SD);
+       for (; va < eva; va += R5K_SC_PAGESIZE) {
+               cache_op_r4k_line(va, CACHEOP_R5K_Page_Invalidate_S);
        }
 
        mips_cp0_status_write(ostatus);
diff -r 12dee5a763ac -r 835bcc59bd73 sys/arch/mips/mips/cache_r5k_subr.S
--- a/sys/arch/mips/mips/cache_r5k_subr.S       Sun Jun 14 14:45:12 2020 +0000
+++ b/sys/arch/mips/mips/cache_r5k_subr.S       Sun Jun 14 15:12:56 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cache_r5k_subr.S,v 1.3 2011/02/20 07:45:47 matt Exp $  */
+/*     $NetBSD: cache_r5k_subr.S,v 1.4 2020/06/14 15:12:56 tsutsui Exp $       */
 
 /*
  * Redistribution and use in source and binary forms, with or without
@@ -65,8 +65,8 @@
        nop
 
 2:
-       cache   0x17, 0(t1)             # 0x17 == Page_Invalidate_SD
-       PTR_ADDU t1, t1, 4096
+       cache   CACHEOP_R5K_Page_Invalidate_S, 0(t1)
+       PTR_ADDU t1, t1, R5K_SC_PAGESIZE
 
        sltu    v0, t1, t2
        bne     v0, zero, 2b