mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-23 23:48:05 +11:00
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
#define SP_ADDR 0xffff
|
|
#define RS_ADDR 0xff00
|
|
#define SYSVARS RS_ADDR-0x80
|
|
|
|
typedef uint8_t byte;
|
|
typedef uint16_t word;
|
|
// Native words in this C Forth VMs are indexed in an array. The word in memory
|
|
// is the typical 0x00 to indicate native, followed by an index byte. The
|
|
// Execute routine will then know which native word to execute.
|
|
typedef void (*NativeWord) ();
|
|
typedef byte (*IORD) ();
|
|
typedef void (*IOWR) (byte data);
|
|
|
|
/* Native word placement
|
|
Being a C VM, all actual native code is outside the VM's memory. However,
|
|
we have a stable ABI to conform to. VM_init() configures the memory by
|
|
placing references to stable words at proper offsets, and then add all other
|
|
native words next to it. This will result in a "boot binary" that is much
|
|
more compact than a real Collapse OS memory layout.
|
|
*/
|
|
typedef struct {
|
|
byte mem[0x10000];
|
|
word SP;
|
|
word RS;
|
|
word IP;
|
|
NativeWord nativew[0x100];
|
|
byte nativew_count;
|
|
// Array of 0x100 function pointers to IO read and write routines. Leave to
|
|
// NULL when IO port is unhandled.
|
|
IORD iord[0x100];
|
|
IOWR iowr[0x100];
|
|
word xcurrent; // only used during native bootstrap
|
|
word maxRS;
|
|
word minSP;
|
|
bool running;
|
|
bool uflw;
|
|
} VM;
|
|
|
|
VM* VM_init();
|
|
void VM_deinit();
|
|
bool VM_steps(int n);
|
|
void VM_memdump();
|
|
void VM_debugstr(char *s);
|
|
void VM_printdbg();
|