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[src/trunk]: src/sys/arch/mvme68k Remove "last kernel PT page" stuff derived ...
details: https://anonhg.NetBSD.org/src/rev/e1d71829f76c
branches: trunk
changeset: 760288:e1d71829f76c
user: tsutsui <tsutsui%NetBSD.org@localhost>
date: Sun Jan 02 06:15:04 2011 +0000
description:
Remove "last kernel PT page" stuff derived from hp300 where PA != VA.
Compile test only, but same changes as other PA == VA m68k ports like
luna68k, news68k, and x68k used for a decade.
diffstat:
sys/arch/mvme68k/include/vmparam.h | 4 +-
sys/arch/mvme68k/mvme68k/pmap_bootstrap.c | 58 ++++--------------------------
2 files changed, 11 insertions(+), 51 deletions(-)
diffs (160 lines):
diff -r 924037d873f9 -r e1d71829f76c sys/arch/mvme68k/include/vmparam.h
--- a/sys/arch/mvme68k/include/vmparam.h Sun Jan 02 06:05:47 2011 +0000
+++ b/sys/arch/mvme68k/include/vmparam.h Sun Jan 02 06:15:04 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vmparam.h,v 1.32 2010/11/06 15:42:47 uebayasi Exp $ */
+/* $NetBSD: vmparam.h,v 1.33 2011/01/02 06:15:04 tsutsui Exp $ */
/*
* Copyright (c) 1982, 1986, 1990, 1993
@@ -147,7 +147,7 @@
#define VM_MAXUSER_ADDRESS ((vaddr_t)0xFFF00000)
#define VM_MAX_ADDRESS ((vaddr_t)0xFFF00000)
#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0)
-#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(0-PAGE_SIZE*NPTEPG*2))
+#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(0-PAGE_SIZE*NPTEPG))
/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
diff -r 924037d873f9 -r e1d71829f76c sys/arch/mvme68k/mvme68k/pmap_bootstrap.c
--- a/sys/arch/mvme68k/mvme68k/pmap_bootstrap.c Sun Jan 02 06:05:47 2011 +0000
+++ b/sys/arch/mvme68k/mvme68k/pmap_bootstrap.c Sun Jan 02 06:15:04 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap_bootstrap.c,v 1.44 2010/12/25 16:14:44 tsutsui Exp $ */
+/* $NetBSD: pmap_bootstrap.c,v 1.45 2011/01/02 06:15:04 tsutsui Exp $ */
/*
* Copyright (c) 1991, 1993
@@ -38,7 +38,7 @@
#include "opt_m68k_arch.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.44 2010/12/25 16:14:44 tsutsui Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.45 2011/01/02 06:15:04 tsutsui Exp $");
#include <sys/param.h>
#include <sys/kcore.h>
@@ -89,7 +89,7 @@
void
pmap_bootstrap(paddr_t nextpa, paddr_t firstpa)
{
- paddr_t kstpa, kptpa, kptmpa, lkptpa, lwp0upa;
+ paddr_t kstpa, kptpa, kptmpa, lwp0upa;
u_int nptpages, kstsize;
st_entry_t protoste, *ste, *este;
pt_entry_t protopte, *pte, *epte;
@@ -110,8 +110,6 @@
*
* kptmpa kernel PT map 1 page
*
- * lkptpa last kernel PT page 1 page
- *
* kptpa statically allocated
* kernel PT pages Sysptsize+ pages
*
@@ -138,8 +136,6 @@
nextpa += kstsize * PAGE_SIZE;
kptmpa = nextpa;
nextpa += PAGE_SIZE;
- lkptpa = nextpa;
- nextpa += PAGE_SIZE;
kptpa = nextpa;
nptpages = RELOC(Sysptsize, int) + (iiomappages + NPTEPG - 1) / NPTEPG;
nextpa += nptpages * PAGE_SIZE;
@@ -164,18 +160,8 @@
* each mapping 256kb. Note that there may be additional "segment
* table" pages depending on how large MAXKL2SIZE is.
*
- * Portions of the last two segment of KVA space (0xFF800000 -
- * 0xFFFFFFFF) are mapped for a couple of purposes.
- * The first segment (0xFF800000 - 0xFFBFFFFF) is mapped
- * for the kernel page tables.
- *
- * XXX: It looks this was copied from hp300 and not sure if
- * XXX: last physical page mapping is really needed on this port.
- * The very last page (0xFFFFF000) in the second segment is mapped
- * to the last physical page of RAM to give us a region in which
- * PA == VA. We use the first part of this page for enabling
- * and disabling mapping. The last part of this page also contains
- * info left by the boot ROM.
+ * Portions of the last segment of KVA space (0xFFC00000 -
+ * 0xFFFFFFFF) are mapped for the kernel page tables.
*
* XXX cramming two levels of mapping into the single "segment"
* table on the 68040 is intended as a temporary hack to get things
@@ -233,23 +219,17 @@
*ste = protoste;
/*
* Now initialize the final portion of that block of
- * descriptors to map kptmpa and the "last PT page".
+ * descriptors to map Sysmap.
*/
i = SG4_LEV1SIZE + (nl1desc * SG4_LEV2SIZE);
ste = (st_entry_t *)kstpa;
- ste = &ste[i + SG4_LEV2SIZE - (NPTEPG / SG4_LEV3SIZE) * 2];
+ ste = &ste[i + SG4_LEV2SIZE - (NPTEPG / SG4_LEV3SIZE)];
este = &ste[NPTEPG / SG4_LEV3SIZE];
protoste = kptmpa | SG_U | SG_RW | SG_V;
while (ste < este) {
*ste++ = protoste;
protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
}
- este = &ste[NPTEPG / SG4_LEV3SIZE];
- protoste = lkptpa | SG_U | SG_RW | SG_V;
- while (ste < este) {
- *ste++ = protoste;
- protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
- }
/*
* Calculate the free level 2 descriptor mask
* noting that we have used:
@@ -287,14 +267,11 @@
*pte++ = PG_NV;
}
/*
- * Initialize the last ones to point to kptmpa and the page
- * table page allocated earlier.
+ * Initialize the last one to point to Sysptmap.
*/
pte = (pt_entry_t *)kptmpa;
pte = &pte[SYSMAP_VA >> SEGSHIFT];
*pte = kptmpa | PG_RW | PG_CI | PG_V;
- pte++; /* XXX should use [MAXADDR >> SEGSHIFT] */
- *pte = lkptpa | PG_RW | PG_CI | PG_U | PG_V;
} else
#endif /* M68040 || M68060 */
{
@@ -325,8 +302,7 @@
while (pte < epte)
*pte++ = PG_NV;
/*
- * Initialize the last ones to point to Sysptmap and the page
- * table page allocated earlier.
+ * Initialize the last one to point to Sysptmap.
*/
ste = (st_entry_t *)kstpa;
ste = &ste[SYSMAP_VA >> SEGSHIFT];
@@ -334,23 +310,7 @@
pte = &pte[SYSMAP_VA >> SEGSHIFT];
*ste = kptmpa | SG_RW | SG_V;
*pte = kptmpa | PG_RW | PG_CI | PG_V;
- ste++; /* XXX should use [MAXADDR >> SEGSHIFT] */
- pte++; /* XXX should use [MAXADDR >> SEGSHIFT] */
- *ste = lkptpa | SG_RW | SG_V;
- *pte = lkptpa | PG_RW | PG_CI | PG_V;
}
- /*
- * Invalidate all but the final entry in the last kernel PT page.
- * The final entry maps the last page of physical memory to
- * prepare a page that is PA == VA to turn on the MMU.
- *
- * XXX: This looks copied from hp300 where PA != VA, but
- * XXX: it's suspicious if this is also required on this port.
- */
- pte = (pt_entry_t *)lkptpa;
- epte = &pte[NPTEPG - 1];
- while (pte < epte)
- *pte++ = PG_NV;
/*
* Initialize kernel page table.
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