88 lines
1.6 KiB
C
88 lines
1.6 KiB
C
//kernel.c
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//08/13/03 Josh Holtrop
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//Holtrop's Operating System
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#include "k_defines.h"
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#include "functions.h"
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void isr(int num);
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void k_init();
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#include "functions.c"
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//9000:306
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typedef struct{
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USHORT ModeAttributes;
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UCHAR WinAAttributes;
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UCHAR WinBAttributes;
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USHORT WinGranularity;
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USHORT WinSize;
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USHORT WinASegment;
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USHORT WinBSegment;
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UINT WinFuncPtr;
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USHORT BytesPerScanLine;
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USHORT XResolution;
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USHORT YResolution;
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UCHAR XCharSize;
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UCHAR YCharSize;
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UCHAR NumberOfPlanes;
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UCHAR BitsPerPixel;
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UCHAR NumberOfBanks;
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UCHAR MemoryModel;
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UCHAR BankSize;
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UCHAR NumberOfImagePages;
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UCHAR Reserved1;
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UCHAR RedMaskSize;
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UCHAR RedFieldPosition;
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UCHAR GreenMaskSize;
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UCHAR GreenFieldPosition;
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UCHAR BlueMaskSize;
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UCHAR BlueFieldPosition;
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UCHAR RsvdMaskSize;
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UCHAR RsvdFieldPosition;
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UCHAR DirectColorModeInfo;
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dword PhysBasePtr;
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UINT OffScreenMemOffset;
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USHORT OffScreenMemSize;
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UCHAR Reserved[206];
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} ModeInfoBlock;
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void k_init()
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{
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remap_pics(0x20, 0x28);
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//set timer : 2e9c = 100hz
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outportb(0x43, 0x34);
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outportb(0x40, 0x9c); //lsb
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outportb(0x40, 0x2e); //msb
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enable_ints();
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ModeInfoBlock *mib = (ModeInfoBlock *) 0x90306;
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UINT *vid = (UINT *) (mib->PhysBasePtr);
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UINT a;
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UINT tot = ((mib->XResolution) * (mib->YResolution));
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word step = 0x1000000 / tot; //step to increase color by for each pixel
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dword color = 0;
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for (a = 0; a < tot; a++)
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{
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vid[a] = color;
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color += step;
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}
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}
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void isr(int num)
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{
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if (num == 0x20)
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{
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(*(char*)0xB8000)++;
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*(char*)0xB8001 = 7;
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eoi();
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}
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}
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