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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#define SP_ADDR 0xffff
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#define RS_ADDR 0xff00
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#define SYSVARS 0xe800
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typedef uint8_t byte;
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typedef uint16_t word;
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// Native words in this C Forth VMs are indexed in an array. The word in memory
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// is the typical 0x00 to indicate native, followed by an index byte. The
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// Execute routine will then know which native word to execute.
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typedef void (*NativeWord) ();
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typedef byte (*IORD) ();
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typedef void (*IOWR) (byte data);
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/* Native word placement
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Being a C VM, all actual native code is outside the VM's memory. However,
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we have a stable ABI to conform to. VM_init() configures the memory by
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placing references to stable words at proper offsets, and then add all other
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native words next to it. This will result in a "boot binary" that is much
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more compact than a real Collapse OS memory layout.
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*/
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typedef struct {
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byte mem[0x10000];
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word SP;
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word RS;
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word IP;
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NativeWord nativew[0x100];
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byte nativew_count;
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// Array of 0x100 function pointers to IO read and write routines. Leave to
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// NULL when IO port is unhandled.
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IORD iord[0x100];
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IOWR iowr[0x100];
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word xcurrent; // only used during native bootstrap
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word maxRS;
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word minSP;
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bool running;
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bool uflw;
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} VM;
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VM* VM_init();
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void VM_deinit();
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bool VM_steps(int n);
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void VM_memdump();
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void VM_debugstr(char *s);
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void VM_printdbg();
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