Commit MD parts of a loosely functional AMD64 port. This is based on

a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to
attempt to get a stable base to start from.  There is a lot missing still.
Worth noting:
- The kernel runs at 1GB in order to cheat with the pmap code.  pmap uses
  a variation of the PAE code in order to avoid having to worry about 4
  levels of page tables yet.
- It boots in 64 bit "long mode" with a tiny trampoline embedded in the
  i386 loader.  This simplifies locore.s greatly.
- There are still quite a few fragments of i386-specific code that have
  not been translated yet, and some that I cheated and wrote dumb C
  versions of (bcopy etc).
- It has both int 0x80 for syscalls (but using registers for argument
  passing, as is native on the amd64 ABI), and the 'syscall' instruction
  for syscalls.  int 0x80 preserves all registers, 'syscall' does not.
- I have tried to minimize looking at the NetBSD code, except in a couple
  of places (eg: to find which register they use to replace the trashed
  %rcx register in the syscall instruction).  As a result, there is not a
  lot of similarity.  I did look at NetBSD a few times while debugging to
  get some ideas about what I might have done wrong in my first attempt.

1 files changed, 9 insertions, 16 deletions

diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index bb7c7e1..0e9697d 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -44,11 +44,9 @@
 #define _MACHINE_VMPARAM_H_ 1
 
 /*
- * Machine dependent constants for 386.
+ * Machine dependent constants for AMD64.
  */
 
-#define VM_PROT_READ_IS_EXEC	/* if you can read -- then you can exec */
-
 /*
  * Virtual memory related constants, all in bytes
  */
@@ -69,8 +67,6 @@
 #define SGROWSIZ	(128UL*1024)		/* amount to grow stack */
 #endif
 
-#define USRTEXT		(1*PAGE_SIZE)		/* base of user text XXX bogus */
-
 /*
  * The time for a process to be blocked before being very swappable.
  * This is a number of seconds which the system takes as being a non-trivial
@@ -90,23 +86,20 @@
  * messy at times, but hey, we'll do anything to save a page :-)
  */
 
-#define VM_MAX_KERNEL_ADDRESS	VADDR(KPTDI+NKPDE-1, NPTEPG-1)
-#define VM_MIN_KERNEL_ADDRESS	VADDR(PTDPTDI, PTDPTDI)
-
-#define	KERNBASE		VADDR(KPTDI, 0)
+#define VM_MAX_KERNEL_ADDRESS	VADDR(0, 0, KPTDI+NKPDE-1, NPTEPG-1)
+#define VM_MIN_KERNEL_ADDRESS	VADDR(0, 0, PTDPTDI, PTDPTDI)
 
-#define KPT_MAX_ADDRESS		VADDR(PTDPTDI, KPTDI+NKPT)
-#define KPT_MIN_ADDRESS		VADDR(PTDPTDI, KPTDI)
+#define	KERNBASE		VADDR(0, 0, KPTDI, 0)
 
-#define UPT_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
-#define UPT_MIN_ADDRESS		VADDR(PTDPTDI, 0)
+#define UPT_MAX_ADDRESS		VADDR(0, 0, PTDPTDI, PTDPTDI)
+#define UPT_MIN_ADDRESS		VADDR(0, 0, PTDPTDI, 0)
 
-#define VM_MAXUSER_ADDRESS	VADDR(PTDPTDI, 0)
+#define VM_MAXUSER_ADDRESS	UPT_MIN_ADDRESS
 
 #define USRSTACK		VM_MAXUSER_ADDRESS
 
-#define VM_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
-#define VM_MIN_ADDRESS		((vm_offset_t)0)
+#define VM_MAX_ADDRESS		UPT_MAX_ADDRESS
+#define VM_MIN_ADDRESS		(0)
 
 /* virtual sizes (bytes) for various kernel submaps */
 #ifndef VM_KMEM_SIZE