From 6ef2d9a02df8e4b33853fa0d326ae28552b2b4e4 Mon Sep 17 00:00:00 2001
From: Jake Burkholder <jake@FreeBSD.org>
Date: Sat, 20 Oct 2001 16:17:04 +0000
Subject: Parameterize the size of the kernel virtual address space on
 KVA_PAGES. Don't use a hard coded address constant for the virtual address of
 the kernel tsb.  Allocate kernel virtual address space for the kernel tsb at
 runtime. Remove unused parameter to pmap_bootstrap. Adapt pmap.c to use
 KVA_PAGES. Map the message buffer too. Add some traces. Implement
 pmap_protect.

---
 sys/sparc64/include/vmparam.h | 46 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

(limited to 'sys/sparc64/include/vmparam.h')

diff --git a/sys/sparc64/include/vmparam.h b/sys/sparc64/include/vmparam.h
index 2b3c2449e732..fd2bae466a7d 100644
--- a/sys/sparc64/include/vmparam.h
+++ b/sys/sparc64/include/vmparam.h
@@ -90,10 +90,50 @@
 #define	VM_KMEM_SIZE		(12*1024*1024)
 #endif
 
-#define	VM_MIN_KERNEL_ADDRESS	(0xc0000000)
-#define	VM_MAX_KERNEL_ADDRESS	(0xffffe000)
+/*
+ * Number of 4 meg pages to use for the kernel tsb.
+ */
+#ifndef	KVA_PAGES
+#define	KVA_PAGES		(1)
+#endif
+
+/*
+ * Range of kernel virtual addresses.  max = min + range.
+ */
+#define	KVA_RANGE \
+	((KVA_PAGES * PAGE_SIZE_4M) << (PAGE_SHIFT - STTE_SHIFT))
+
+/*
+ * Lowest kernel virtual address, where the kernel is loaded.
+ *
+ * If we are using less than 4 super pages for the kernel tsb, the address
+ * space is less than 4 gigabytes, so put it at the end of the first 4
+ * gigbytes.  This allows the kernel and the firmware mappings to be mapped
+ * with a single contiguous tsb.  Otherwise start at 0, we'll cover them
+ * anyway.
+ *
+ * ie:
+ * kva_pages = 1
+ *	vm_max_kernel_address	0xffffe000
+ *	openfirmware		0xf0000000
+ *	kernbase		0xc0000000
+ * kva_pages = 8
+ *	vm_max_kernel_address	0x1ffffe000
+ *	openfirmware		0xf0000000
+ *	kernbase		0x0
+ *
+ * There are at least 4 pages of dynamic linker junk before kernel text begins,
+ * so starting at zero is fairly safe.
+ */
+#if KVA_PAGES < 4
+#define	VM_MIN_KERNEL_ADDRESS	((1UL << 32) - KVA_RANGE)
+#else
+#define	VM_MIN_KERNEL_ADDRESS	(0)
+#endif
 
-#define	KERNBASE		(0xc0000000)
+#define	VM_MAX_KERNEL_ADDRESS	(VM_MIN_KERNEL_ADDRESS + KVA_RANGE - PAGE_SIZE)
+#define	UPT_MIN_ADDRESS		(VM_MIN_KERNEL_ADDRESS + KVA_RANGE)
+#define	KERNBASE		(VM_MIN_KERNEL_ADDRESS)
 
 /*
  * Initial pagein size of beginning of executable file.
-- 
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