Nigel
5781f730d9
A software interrupt with vector 0x50 will cause a syscall to start executing. The EAX register will hold the syscall_num. Other registers and the stack can be used to hold further arguments.
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/*
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Copyright © Nigel Barink 2023
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*/
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#include "memory/memory.h"
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#include "memory/KernelHeap.h"
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#include "memory/gdt/gdtc.h"
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#include "memory/TaskStateSegment.h"
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#include "supervisorterminal/superVisorTerminal.h"
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#include "drivers/vga/VBE.h"
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#include "pci/pci.h"
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#include "drivers/pit/pit.h"
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#include "i386/processor.h"
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#include "terminal/kterm.h"
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#include "interrupts/idt.h"
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#include "serial.h"
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#include "storage/vfs/vfs.h"
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#include "storage/filesystems/FAT/FAT.h"
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#include "acpi/acpi.h"
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#include "memory/VirtualMemoryManager.h"
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extern BootInfoBlock* BIB;
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extern "C" void LoadGlobalDescriptorTable();
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extern "C" void jump_usermode();
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void initBootDrive(){
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printf("Boot device: 0x%x\n", BIB->bootDeviceID);
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unsigned int part3 = BIB->bootDeviceID & 0xFF;
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unsigned int part2 = (BIB->bootDeviceID & 0xFF00) >> 8;
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unsigned int part1 = (BIB->bootDeviceID & 0xFF0000) >> 16;
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unsigned int drive = (BIB->bootDeviceID & 0xFF000000) >> 24;
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if (drive == 0x80 )
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printf("booted from disk!\n");
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if(drive == 0x00)
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printf("booted from floppy disk\n");
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printf("Part1: %d, Part2: %d, Part3: %d\n", part1, part2 , part3);
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ATAPIO::Identify(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER);
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}
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extern "C" void kernel ()
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{
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init_serial();
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kterm_init();
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setup_tss();
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initGDT();
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initidt();
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LoadGlobalDescriptorTable();
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flush_tss();
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printf("Memory setup complete!\n");
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// Enable interrupts
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asm volatile("STI");
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initHeap();
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pit_initialise();
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ACPI::initialize();
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PCI::Scan();
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processor::initialize();
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processor::enable_protectedMode();
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initBootDrive();
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VirtualFileSystem::initialize();
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#ifdef VFS_EXAMPLE
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auto fontFile = VirtualFileSystem::open("/FONT PSF", 0);
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if(grubcfg->flags == 0){
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uint16_t* contents = (uint16_t*) malloc(sizeof(uint16_t) * 256);
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grubcfg->read(grubcfg, contents, 512);
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for(int i =0 ; i < grubcfg->root->size; i++ ){
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kterm_put(contents[i] & 0x00ff);
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kterm_put(contents[i] >> 8);
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}
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kterm_put('\n');
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free((void*)contents);
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}else{
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printf("Could not find file\n");
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}
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#endif
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#ifdef USERMODE_RELEASE
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// Lets jump into user mode
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jump_usermode();
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#else
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startSuperVisorTerminal();
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#endif
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} |