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97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
#pragma once
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#include "types.h"
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union Descriptor {
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struct {
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WORD limit_lo;
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WORD base_lo;
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BYTE base_hi;
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BYTE type : 4;
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BYTE descriptor_type : 1;
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BYTE dpl : 2;
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BYTE segment_present : 1;
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BYTE limit_hi : 4;
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BYTE : 1;
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BYTE zero : 1;
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BYTE operation_size : 1;
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BYTE granularity : 1;
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BYTE base_hi2;
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};
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struct {
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DWORD low;
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DWORD high;
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};
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enum Type {
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Invalid = 0,
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AvailableTSS_16bit = 0x1,
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LDT = 0x2,
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BusyTSS_16bit = 0x3,
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CallGate_16bit = 0x4,
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TaskGate = 0x5,
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InterruptGate_16bit = 0x6,
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TrapGate_16bit = 0x7,
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AvailableTSS_32bit = 0x9,
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BusyTSS_32bit = 0xb,
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CallGate_32bit = 0xc,
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InterruptGate_32bit = 0xe,
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TrapGate_32bit = 0xf,
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};
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void setBase(void* b)
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{
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base_lo = (DWORD)(b) & 0xffff;
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base_hi = ((DWORD)(b) >> 16) & 0xff;
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base_hi2 = ((DWORD)(b) >> 24) & 0xff;
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}
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void setLimit(DWORD l)
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{
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limit_lo = (DWORD)l & 0xffff;
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limit_hi = ((DWORD)l >> 16) & 0xff;
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}
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} PACKED;
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void gdt_init();
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void idt_init();
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void registerInterruptHandler(BYTE number, void (*f)());
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void registerUserCallableInterruptHandler(BYTE number, void (*f)());
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void flushIDT();
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void flushGDT();
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void loadTaskRegister(WORD selector);
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WORD allocateGDTEntry();
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Descriptor& getGDTEntry(WORD selector);
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void writeGDTEntry(WORD selector, Descriptor&);
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#define HANG asm volatile( "cli; hlt" );
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#define LSW(x) ((DWORD)(x) & 0xFFFF)
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#define MSW(x) (((DWORD)(x) >> 16) & 0xFFFF)
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#define LSB(x) ((x) & 0xFF)
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#define MSB(x) (((x)>>8) & 0xFF)
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#define disableInterrupts() asm volatile("cli");
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#define enableInterrupts() asm volatile("sti");
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/* Map IRQ0-15 @ ISR 0x50-0x5F */
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#define IRQ_VECTOR_BASE 0x50
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struct RegisterDump {
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WORD gs;
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WORD fs;
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WORD es;
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WORD ds;
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DWORD edi;
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DWORD esi;
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DWORD ebp;
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DWORD esp;
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DWORD ebx;
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DWORD edx;
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DWORD ecx;
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DWORD eax;
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DWORD eip;
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WORD cs;
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WORD __csPadding;
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DWORD eflags;
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} PACKED;
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