107 lines
1.8 KiB
C
107 lines
1.8 KiB
C
#pragma once
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#include <stdint.h>
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typedef enum {
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R0 = 0,
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R1 = 1,
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R2 = 2,
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R3 = 3,
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Rbp = 4,
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Rsp = 5,
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Rip = 6,
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Rfl = 7,
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Rcs = 8,
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} Reg;
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typedef enum {
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Fl_Zero,
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Fl_Eq,
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Fl_Be,
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Fl_Lt,
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Fl_Err,
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Fl_Int,
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Fl_Vcd,
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} Flag;
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typedef enum {
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Op_Nop,
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Op_Hlt,
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Op_Jmp,
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Op_Jnz,
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Op_Test,
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Op_Cmp,
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Op_Mov8,
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Op_Mov16,
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Op_In,
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Op_Out,
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Op_Lit,
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Op_Int,
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Op_IRet,
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Op_Or,
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Op_Xor,
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Op_And,
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Op_Shl,
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Op_RShl,
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Op_Shr,
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Op_RShr,
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Op_Add,
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Op_Sub,
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Op_RSub,
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Op_Mul,
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Op_IMul,
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Op_Div,
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Op_IDiv,
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Op_RDiv,
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Op_RIDiv,
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Op_Mod,
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Op_RMod,
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} Op;
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typedef struct Drive Drive;
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typedef void (*DriveReadFn)(Drive* drive, uint8_t* block, uint16_t i);
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typedef void (*DriveWriteFn)(Drive* drive, const uint8_t* block, uint16_t i);
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struct Drive {
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void* self;
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uint16_t block_size;
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uint16_t block_amount;
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DriveReadFn read;
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DriveWriteFn write;
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};
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typedef enum {
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InterruptType_None,
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InterruptType_Shutdown,
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InterruptType_KeyEvent,
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} InterruptType;
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typedef struct {
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InterruptType type;
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union {
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uint16_t keycode;
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};
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} Interrupt;
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#define VCD_BUFFER_OFFSET 0x0c00
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#define VCD_BUFFER_SIZE 480
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#define VCD_SCREEN_WIDTH 40
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#define VCD_SCREEN_HEIGHT 12
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typedef struct IODevice IODevice;
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typedef void (*IODeviceSetCharFn)(
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IODevice* device, uint16_t offset, uint8_t value);
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typedef void (*IODeviceWaitForInterruptFn)(IODevice* device);
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typedef Interrupt (*IODeviceMaybeNextInterruptFn)(IODevice* device);
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struct IODevice {
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void* self;
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IODeviceSetCharFn set_char;
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IODeviceWaitForInterruptFn wait_for_interrupt;
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IODeviceMaybeNextInterruptFn maybe_next_interrupt;
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};
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void vm_start(Drive* boot_drive, IODevice* io_device);
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const char* op_str(Op op);
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