forked from PoliEcho-holding-org/kern
Tom-on
9c96636436
- Pretty much rewrote stage1.asm - Changed some addresses in stage2.asm and in memory/adresses.h - Changed stage3.c to read root INode and it's dirEntries to find kernel.bin and term16n.fnt - Made a fake ls command in kernel.c, just so it prints something - Fixed makedisk.c to make the disk image properly - Changed Makefile to compile makedisk.c and then run makedisk - Added makedisk executable to .gitignore
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
#include <memory/physical.h>
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#include <memory/virtual.h>
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#include <memory/addresses.h>
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#include <disk/disk.h>
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//#include <disk/filesys.h>
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#include <screen/gfxmode.h>
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#include <fs/fs.h>
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uint8_t loadFile(char* filename, void* dest);
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__attribute__ ((section("entry")))
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void main() {
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// Physical memory manager setup
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uint32_t smapEntryCount = *(uint32_t*)SMAP_ENTRY_COUNT;
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smapEntry_t* smapEntries = (smapEntry_t*)SMAP_ENTRIES;
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smapEntries += smapEntryCount - 1;
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uint32_t totalMemory = smapEntries->baseAddress + smapEntries->length - 1;
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setupPhysicalMemoryManager(MEMMAP_AREA, totalMemory);
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smapEntries = (smapEntry_t*)SMAP_ENTRIES;
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for (uint32_t i = 0; i < smapEntryCount; i++) {
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if (smapEntries[i].type == 1) {
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initMemoryRegion(smapEntries[i].baseAddress, smapEntries[i].length);
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}
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}
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deinitMemoryRegion(0x1000, 0x11000); // Reserve kernel memory (under 0x12000)
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deinitMemoryRegion(MEMMAP_AREA, maxBlocks / BLOCKS_PER_BYTE);
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// Load root dir, find kernel INode and parse it
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superBlock_t* superblock = (superBlock_t*)SUPERBLOCK_LOC;
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superblock->rootInodePtr = BOOT_FIRST_INODE_LOC + sizeof(inode_t);
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diskRead(superblock->firstDataBlock * 8, 8, (void*)SCRATCH_BLOCK_LOC);
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if (loadFile("kernel.bin", (void*)KERNEL_LOC) != 0) __asm__ volatile ("cli; hlt" : : "a"(0xDeadBeef));
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if (loadFile("term16n.fnt", (void*)FONT_LOC) != 0) __asm__ volatile ("cli; hlt" : : "a"(0xDeadBeef));
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// Virtual memory manager setup
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if (setupVirtualMemoryManager() != 0) {
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while (1);
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}
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// Identity map VBE framebuffer
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uint32_t fbSize = (gfxMode->yRes * gfxMode->linearBytesPerScanline) / PAGE_SIZE;
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if (fbSize % PAGE_SIZE > 0) { fbSize++; }
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fbSize *= 2; // Double for hardware
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for (uint32_t i = 0, fbStart = gfxMode->physicalBasePtr; i < fbSize; i++, fbStart += PAGE_SIZE) {
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mapPage((void*)fbStart, (void*)fbStart);
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}
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deinitMemoryRegion(gfxMode->physicalBasePtr, fbSize * BLOCK_SIZE);
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*(uint32_t*)PHYS_MEM_MAX_BLOCKS = maxBlocks;
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*(uint32_t*)PHYS_MEM_USED_BLOCKS = usedBlocks;
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for (uint32_t virt = KERNEL_LOC; virt < 0x400000; virt += PAGE_SIZE) {
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unmapPage((void*)virt);
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}
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__asm__ volatile ("movl %cr3, %ecx; movl %ecx, %cr3");
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*(uint32_t*)CURRENT_PAGE_DIR_ADDR = (uint32_t)currentPd;
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// Call/jump to kernel
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((void(*)(void))0xC0000000)();
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}
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uint8_t loadFile(char* filename, void* dest) {
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dirEntry_t* dirEntry = (dirEntry_t*)SCRATCH_BLOCK_LOC;
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while (dirEntry->name[0] != '\0') {
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if (strcmp(dirEntry->name, filename) == 0) break;
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dirEntry++;
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}
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if (dirEntry->name[0] == '\0') return 1;
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inode_t* inode = (inode_t*)BOOT_FIRST_INODE_LOC;
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while (inode->id != dirEntry->id) {
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inode++;
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}
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uint32_t totalBlocks = bytesToBlocks(inode->sizeBytes);
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uint32_t addressOffset = 0;
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for (uint8_t i = 0; i < 4 && totalBlocks > 0; i++) {
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diskRead(inode->extent[i].firstBlock * 8, inode->extent[i].length * 8, dest + addressOffset);
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addressOffset += inode->extent[i].length * FS_BLOCK_SIZE;
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totalBlocks -= inode->extent[i].length;
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}
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if (totalBlocks > 0) {
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// TODO: Indirect extents
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}
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return 0;
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}
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