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, 16 insertions, 25 deletions

diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h
index c7a837b..551bf8f 100644
--- a/sys/amd64/include/pcb.h
+++ b/sys/amd64/include/pcb.h
@@ -46,34 +46,25 @@
 #include <machine/npx.h>
 
 struct pcb {
-	int	pcb_cr3;
-	int	pcb_edi;
-	int	pcb_esi;
-	int	pcb_ebp;
-	int	pcb_esp;
-	int	pcb_ebx;
-	int	pcb_eip;
+	register_t	padxx[8];
+	register_t	pcb_cr3;
+	register_t	pcb_r15;
+	register_t	pcb_r14;
+	register_t	pcb_r13;
+	register_t	pcb_r12;
+	register_t	pcb_rbp;
+	register_t	pcb_rsp;
+	register_t	pcb_rbx;
+	register_t	pcb_rip;
+	register_t	pcb_rflags;
 
-	int     pcb_dr0;
-	int     pcb_dr1;
-	int     pcb_dr2;
-	int     pcb_dr3;
-	int     pcb_dr6;
-	int     pcb_dr7;
-
-	union	savefpu	pcb_save;
-	u_int	pcb_flags;
-#define	FP_SOFTFP	0x01	/* process using software fltng pnt emulator */
-#define	PCB_DBREGS	0x02	/* process using debug registers */
-#define	PCB_NPXTRAP	0x04	/* npx trap pending */
-#define	PCB_NPXINITDONE	0x08	/* fpu state is initialized */
-#define	PCB_VM86CALL	0x10	/* in vm86 call */
+	struct	savefpu	pcb_save;
+	u_long	pcb_flags;
+#define	PCB_NPXTRAP	0x01	/* npx trap pending */
+#define	PCB_NPXINITDONE	0x02	/* fpu state is initialized */
+#define	PCB_FULLCTX	0x04	/* full context restore on sysret */
 
 	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
-	int	pcb_gs;
-	struct	pcb_ext	*pcb_ext;	/* optional pcb extension */
-	int	pcb_psl;	/* process status long */
-	u_long	__pcb_spare[2];	/* adjust to avoid core dump size changes */
 };
 
 #ifdef _KERNEL