[src/trunk]: src/sys/arch/riscv/include Set RISCV_DIRECTMAP_SIZE to 2^64-PAGE...

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

details:   https://anonhg.NetBSD.org/src/rev/18dcecaec297
branches:  trunk
changeset: 371802:18dcecaec297
user:      simonb <simonb%NetBSD.org@localhost>
date:      Wed Oct 12 07:53:15 2022 +0000

description:
Set RISCV_DIRECTMAP_SIZE to 2^64-PAGESIZE, since 2^64 is effectively 0
for a 64bit constant.
Bump VM_PHYSSEG_MAX from 1 to 16.

diffstat:

 sys/arch/riscv/include/vmparam.h |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (31 lines):

diff -r 2ec3afcc0c43 -r 18dcecaec297 sys/arch/riscv/include/vmparam.h
--- a/sys/arch/riscv/include/vmparam.h  Wed Oct 12 07:50:56 2022 +0000
+++ b/sys/arch/riscv/include/vmparam.h  Wed Oct 12 07:53:15 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vmparam.h,v 1.10 2022/09/20 07:18:23 skrll Exp $       */
+/*     $NetBSD: vmparam.h,v 1.11 2022/10/12 07:53:15 simonb Exp $      */
 
 /*-
  * Copyright (c) 2014, 2020 The NetBSD Foundation, Inc.
@@ -142,10 +142,10 @@
 #ifdef _LP64
 /*
  * Since we have the address space, we map all of physical memory (RAM)
- * using block page table entries.
+ * using gigapages on SV39, terapages on SV48 and petapages on SV57.
  */
 #define RISCV_DIRECTMAP_MASK   ((vaddr_t) 0xffffffe000000000L)
-#define RISCV_DIRECTMAP_SIZE   (-RISCV_DIRECTMAP_MASK) /* 128GiB */
+#define RISCV_DIRECTMAP_SIZE   (-RISCV_DIRECTMAP_MASK - PAGE_SIZE)     /* 128GiB */
 #define RISCV_DIRECTMAP_START  RISCV_DIRECTMAP_MASK
 #define RISCV_DIRECTMAP_END    (RISCV_DIRECTMAP_START + RISCV_DIRECTMAP_SIZE)
 #define RISCV_KVA_P(va)        (((vaddr_t) (va) & RISCV_DIRECTMAP_MASK) != 0)
@@ -173,7 +173,7 @@
 
 /* VM_PHYSSEG_MAX defined by platform-dependent code. */
 #ifndef VM_PHYSSEG_MAX
-#define VM_PHYSSEG_MAX         1
+#define VM_PHYSSEG_MAX         16
 #endif
 #if VM_PHYSSEG_MAX == 1
 #define        VM_PHYSSEG_STRAT        VM_PSTRAT_BIGFIRST