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Import the "gerbert" kernel I worked on earlier this year.

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It's a lot crappier than I remembered it. It's gonna need a lot of work.
This commit is contained in:
Andreas Kling 2018-10-16 11:01:38 +02:00
parent f608629704
commit 9396108034
55 changed files with 4600 additions and 0 deletions
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77
Kernel/i386.h Normal file
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#pragma once
#include "types.h"
union Descriptor {
struct {
WORD limit_lo;
WORD base_lo;
BYTE base_hi;
BYTE type : 4;
BYTE descriptor_type : 1;
BYTE dpl : 2;
BYTE segment_present : 1;
BYTE limit_hi : 4;
BYTE : 1;
BYTE zero : 1;
BYTE operation_size : 1;
BYTE granularity : 1;
BYTE base_hi2;
};
struct {
DWORD low;
DWORD high;
};
enum Type {
Invalid = 0,
AvailableTSS_16bit = 0x1,
LDT = 0x2,
BusyTSS_16bit = 0x3,
CallGate_16bit = 0x4,
TaskGate = 0x5,
InterruptGate_16bit = 0x6,
TrapGate_16bit = 0x7,
AvailableTSS_32bit = 0x9,
BusyTSS_32bit = 0xb,
CallGate_32bit = 0xc,
InterruptGate_32bit = 0xe,
TrapGate_32bit = 0xf,
};
void setBase(void* b)
{
base_lo = (DWORD)(b) & 0xffff;
base_hi = ((DWORD)(b) >> 16) & 0xff;
base_hi2 = ((DWORD)(b) >> 24) & 0xff;
}
void setLimit(DWORD l)
{
limit_lo = (DWORD)l & 0xffff;
limit_hi = ((DWORD)l >> 16) & 0xff;
}
} PACKED;
void gdt_init();
void idt_init();
void registerInterruptHandler(BYTE number, void (*f)());
void registerUserCallableInterruptHandler(BYTE number, void (*f)());
void flushIDT();
void flushGDT();
void loadTaskRegister(WORD selector);
WORD allocateGDTEntry();
Descriptor& getGDTEntry(WORD selector);
void writeGDTEntry(WORD selector, Descriptor&);
#define HANG asm volatile( "cli; hlt" );
#define LSW(x) ((DWORD)(x) & 0xFFFF)
#define MSW(x) (((DWORD)(x) >> 16) & 0xFFFF)
#define LSB(x) ((x) & 0xFF)
#define MSB(x) (((x)>>8) & 0xFF)
#define disableInterrupts() asm volatile("cli");
#define enableInterrupts() asm volatile("sti");
/* Map IRQ0-15 @ ISR 0x50-0x5F */
#define IRQ_VECTOR_BASE 0x50