z8: initial sketch of Z8 CPU enabling

Kernel/cpu-z8/cpu.h

@@ -0,0 +1,58 @@
+
+#define uputp  uputw			/* Copy user pointer type */
+#define ugetp  ugetw			/* between user and kernel */
+#define uputi  uputw			/* Copy user int type */
+#define ugeti  ugetw			/* between user and kernel */
+
+typedef uint16_t irqflags_t;
+
+/* Allow a minimum of 512 bytes gap between stack and top of allocations */
+#define brk_limit() (udata.u_syscall_sp - 512)
+
+typedef uint16_t size_t;
+typedef int16_t ssize_t;
+extern void *memcpy(void *dest, const void *src, size_t n);
+extern char *strcpy(char *dest, const char *src);
+extern char *strncpy(char *dest, const char *src, size_t n);
+extern char *strchr(const char *s, int c);
+extern void *memset(void *dest, int c, size_t n);
+
+/* There is no compiler optimized inline memmove */
+extern void *memmove(void *dest, const void *src, size_t n);
+
+extern int16_t strlen(const char *p);
+
+#define	staticfast
+
+/* User's structure for times() system call */
+typedef unsigned long clock_t;
+
+typedef union {            /* this structure is endian dependent */
+    clock_t  full;         /* 32-bit count of ticks since boot */
+    struct {
+      uint16_t low;         /* 16-bit count of ticks since boot */
+      uint16_t high;
+    } h;
+} ticks_t;
+
+#define used(x)	x
+
+#define cpu_to_le16(x)	swab(x)
+#define le16_to_cpu(x)	swab(x)
+#define cpu_to_le32(x)	((((uint32_t)cpu_to_le16((x) & 0xFFFF)) << 16) | \
+				(uint32_t)cpu_to_le16((x) >> 16))
+#define le32_to_cpu(x)	cpu_to_le32(x)
+
+#define ntohs(x)	(x)
+#define ntohl(x)	(x)
+
+#define BIG_ENDIAN
+
+#define __packed
+#define barrier()
+#define inline
+
+#define __fastcall
+
+extern void out(uint_fast8_t port, uint_fast8_t val);
+extern uint_fast8_t in(uint_fast8_t port);

Kernel/cpu-z8/image.mk

@@ -0,0 +1,7 @@
+tools/visualize6800: tools/visualize6800.c
+
+tools/pack85: tools/pack85.c
+
+fuzix.bin: target $(OBJS) tools/pack85 tools/visualize6800
+	+$(MAKE) -C platform/platform-$(TARGET) image
+	tools/visualize6800 <fuzix.map

Kernel/cpu-z8/kernel-z8.def

@@ -0,0 +1,48 @@
+; Keep these in sync with struct u_data;;
+
+#include "../build/kernel.def"
+
+#define U_DATA__U_PTAB              _udata+0   /* struct p_tab*	*/
+#define U_DATA__U_PAGE              _udata+2   /* uint16_t		*/
+#define U_DATA__U_PAGE2             _udata+4   /* uint16_t		*/
+#define U_DATA__U_INSYS             _udata+6   /* bool		*/
+#define U_DATA__U_CALLNO            _udata+7   /* uint8_t		*/
+#define U_DATA__U_SYSCALL_SP        _udata+8   /* void *		*/
+#define U_DATA__U_RETVAL            _udata+10  /* int16_t		*/
+#define U_DATA__U_ERROR             _udata+12  /* int16_t		*/
+#define U_DATA__U_SP                _udata+14  /* void *		*/
+#define U_DATA__U_ININTERRUPT       _udata+16  /* bool		*/
+#define U_DATA__U_CURSIG            _udata+17  /* int8_t		*/
+#define U_DATA__U_ARGN              _udata+18  /* uint16_t		*/
+#define U_DATA__U_ARGN1             _udata+20  /* uint16_t		*/
+#define U_DATA__U_ARGN2             _udata+22  /* uint16_t		*/
+#define U_DATA__U_ARGN3             _udata+24  /* uint16_t		*/
+#define U_DATA__U_ISP               _udata+26  /* void * initial stack pointer when _execing */
+#define U_DATA__U_TOP               _udata+28  /* uint16_t		*/
+#define U_DATA__U_BREAK             _udata+30  /* uint16_t		*/
+#define U_DATA__U_CODEBASE	    _udata+32  /* uint16_t		*/
+#define U_DATA__U_SIGVEC            _udata+34  /* table of function pointers void *	*/
+#define U_DATA__U_BASE              _udata+98  /* uint8_t *		*/
+#define U_DATA__U_COUNT             _udata+100 /* uint16_t		*/
+#define U_DATA__U_OFFSET            _udata+102 /* uint32_t		*/
+
+; Keep these in sync with struct p_tab;;
+#define P_TAB__P_STATUS_OFFSET      0
+#define P_TAB__P_FLAGS_OFFSET	    1
+#define P_TAB__P_TTY_OFFSET         2
+#define P_TAB__P_PID_OFFSET         3
+#define P_TAB__P_PAGE_OFFSET        15
+#define P_TAB__P_PAGE2_OFFSET       17
+
+#define P_RUNNING                   1   /* value from include/kernel.h */
+#define P_READY                     2   /* value from include/kernel.h */
+
+#define PFL_BATCH		    4	/* value from include/kernel.h */
+
+#define OS_BANK                     0	/* value from include/kernel.h */
+
+#define EAGAIN                      11	/* value from include/kernel.h */
+
+; Keep in sync with struct blkbuf
+#define BUFSIZE                     520
+