forked from PoliEcho-holding-org/kern
Tom-on
e9abfc2e4a
- Minor makefile chnages - stage3.c "prekernel", sets up memory stuff and jumps to kernel - kernel is now at 0xC0000000 - 3GB+ "higher half" - Added some global variables in memory/addresses.h
63 lines
2.1 KiB
C
63 lines
2.1 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/text.h>
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__attribute__ ((section("entry")))
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void main() {
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diskRead(15, 1, filetable); // Load filetable into memory; TODO: Make a filetableUpdate() function that just keeps the stored and memory verisons in sync
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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; // After a unit32_t
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uint32_t totalMemory = smapEntries[smapEntryCount - 1].baseAddress + smapEntries[smapEntryCount - 1].length - 1;
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setupPhysicalMemoryManager(MEMMAP_AREA, totalMemory);
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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, 0x9000); // Reserve kernel memory (under 0xa000)
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deinitMemoryRegion(MEMMAP_AREA, maxBlocks / BLOCKS_PER_BYTE);
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// Load kernel into memory
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if (readFile("kernel.bin", (void*)KERNEL_LOC) != 0) { // Check if kernel.bin was loaded
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// TODO: Add error messages
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while (1);
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}
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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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