forked from PoliEcho-holding-org/kern
83 lines
2.8 KiB
C
83 lines
2.8 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 <screen/gfxmode.h>
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#include <screen/text.h>
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#include <error/bigerr.h>
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#include <disk/disk.h>
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#include <fs/impl.h>
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#include <fs/fs.h>
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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, 0x11fff); // 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* sb = (superblock_t*)SUPERBLOCK_LOC;
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sb->rootInodePtr = BOOT_FIRST_INODE_LOC + sizeof(inode_t);
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inode_t* root = (inode_t*)sb->rootInodePtr;
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loadFile(root, (void*)SCRATCH_BLOCK_LOC);
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inode_t* inode;
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if ((inode = getInode("kernel.bin", (dirEntry_t*)SCRATCH_BLOCK_LOC)) == NULL) {
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// kernel.bin doesn't exist??? very bad -> error
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bigError(0xDEAD);
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} else { loadFile(inode, (void*)KERNEL_LOC); }
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font_t* font = (font_t*)FONT_LOC;
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if ((inode = getInode("term16n.fnt", (dirEntry_t*)SCRATCH_BLOCK_LOC)) != NULL) {
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loadFile(inode, font);
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} else if ((inode = getInode("testfont.fnt", (dirEntry_t*)SCRATCH_BLOCK_LOC)) != NULL) {
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loadFile(inode, font);
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} else {
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// No font found, bad.
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bigError(0xBeef);
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}
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// Virtual memory manager setup
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if (setupVirtualMemoryManager() != 0) {
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bigError(0xCafe);
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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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bigError(0xffffffff);
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}
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