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, 26 insertions, 76 deletions

diff --git a/sys/amd64/include/reg.h b/sys/amd64/include/reg.h
index 56f0f91..334dd37 100644
--- a/sys/amd64/include/reg.h
+++ b/sys/amd64/include/reg.h
@@ -41,66 +41,31 @@
 #define	_MACHINE_REG_H_
 
 /*
- * Indices for registers in `struct trapframe' and `struct regs'.
- *
- * This interface is deprecated.  In the kernel, it is only used in FPU
- * emulators to convert from register numbers encoded in instructions to
- * register values.  Everything else just accesses the relevant struct
- * members.  In userland, debuggers tend to abuse this interface since
- * they don't understand that `struct regs' is a struct.  I hope they have
- * stopped accessing the registers in the trap frame via PT_{READ,WRITE}_U
- * and we can stop supporting the user area soon.
- */
-#define	tFS	(0)
-#define	tES	(1)
-#define	tDS	(2)
-#define	tEDI	(3)
-#define	tESI	(4)
-#define	tEBP	(5)
-#define	tISP	(6)
-#define	tEBX	(7)
-#define	tEDX	(8)
-#define	tECX	(9)
-#define	tEAX	(10)
-#define	tERR	(12)
-#define	tEIP	(13)
-#define	tCS	(14)
-#define	tEFLAGS	(15)
-#define	tESP	(16)
-#define	tSS	(17)
-
-/*
- * Indices for registers in `struct regs' only.
- *
- * Some registers live in the pcb and are only in an "array" with the
- * other registers in application interfaces that copy all the registers
- * to or from a `struct regs'.
- */
-#define	tGS	(18)
-
-/*
  * Register set accessible via /proc/$pid/regs and PT_{SET,GET}REGS.
  */
 struct reg {
-	unsigned int	r_fs;
-	unsigned int	r_es;
-	unsigned int	r_ds;
-	unsigned int	r_edi;
-	unsigned int	r_esi;
-	unsigned int	r_ebp;
-	unsigned int	r_isp;
-	unsigned int	r_ebx;
-	unsigned int	r_edx;
-	unsigned int	r_ecx;
-	unsigned int	r_eax;
-	unsigned int	r_trapno;
-	unsigned int	r_err;
-	unsigned int	r_eip;
-	unsigned int	r_cs;
-	unsigned int	r_eflags;
-	unsigned int	r_esp;
-	unsigned int	r_ss;
-	unsigned int	r_gs;
+	register_t	r_r15;
+	register_t	r_r14;
+	register_t	r_r13;
+	register_t	r_r12;
+	register_t	r_r11;
+	register_t	r_r10;
+	register_t	r_r9;
+	register_t	r_r8;
+	register_t	r_rdi;
+	register_t	r_rsi;
+	register_t	r_rbp;
+	register_t	r_rbx;
+	register_t	r_rdx;
+	register_t	r_rcx;
+	register_t	r_rax;
+	register_t	r_trapno;
+	register_t	r_err;
+	register_t	r_rip;
+	register_t	r_cs;
+	register_t	r_rflags;
+	register_t	r_rsp;
+	register_t	r_ss;
 };
 
 /*
@@ -112,30 +77,15 @@ struct fpreg {
 	 * simplified struct.  This may be too much detail.  Perhaps
 	 * an array of unsigned longs is best.
 	 */
-	unsigned long	fpr_env[7];
-	unsigned char	fpr_acc[8][10];
-	unsigned long	fpr_ex_sw;
-	unsigned char	fpr_pad[64];
+	unsigned long	fpr_env[4];
+	unsigned char	fpr_acc[8][16];
+	unsigned char	fpr_xacc[16][16];
 };
 
-/*
- * Register set accessible via /proc/$pid/dbregs.
- */
 struct dbreg {
-	unsigned int  dr[8];	/* debug registers */
-				/* Index 0-3: debug address registers */
-				/* Index 4-5: reserved */
-				/* Index 6: debug status */
-				/* Index 7: debug control */
+	unsigned long grrr;
 };
 
-#define DBREG_DR7_EXEC      0x00      /* break on execute       */
-#define DBREG_DR7_WRONLY    0x01      /* break on write         */
-#define DBREG_DR7_RDWR      0x03      /* break on read or write */
-#define DBREG_DRX(d,x) ((d)->dr[(x)]) /* reference dr0 - dr7 by
-                                         register number */
-
-
 #ifdef _KERNEL
 /*
  * XXX these interfaces are MI, so they should be declared in a MI place.