Some file restructuring

2024-10-10 10:03:58 +02:00
parent 886a802cc1
commit 63ecaec569
16 changed files with 3228 additions and 11 deletions
@@ -0,0 +1,83 @@
+#include <memory/physical.h>
+#include <memory/virtual.h>
+#include <memory/addresses.h>
+#include <screen/gfxmode.h>
+#include <screen/text.h>
+#include <error/bigerr.h>
+#include <disk/disk.h>
+#include <fs/impl.h>
+#include <fs/fs.h>
+#include <stdio.h>
+
+__attribute__ ((section("entry")))
+void main() {
+    // Physical memory manager setup
+    uint32_t smapEntryCount = *(uint32_t*)SMAP_ENTRY_COUNT;
+    smapEntry_t* smapEntries = (smapEntry_t*)SMAP_ENTRIES;
+    smapEntries += smapEntryCount - 1;
+    uint32_t totalMemory = smapEntries->baseAddress + smapEntries->length - 1;
+
+    setupPhysicalMemoryManager(MEMMAP_AREA, totalMemory);
+
+    smapEntries = (smapEntry_t*)SMAP_ENTRIES;
+    for (uint32_t i = 0; i < smapEntryCount; i++) {
+        if (smapEntries[i].type == 1) {
+            initMemoryRegion(smapEntries[i].baseAddress, smapEntries[i].length);
+        }
+    }
+
+    deinitMemoryRegion(0x1000, 0x11fff); // Reserve kernel memory (under 0x12000)
+    deinitMemoryRegion(MEMMAP_AREA, maxBlocks / BLOCKS_PER_BYTE);
+
+    // Load root dir, find kernel INode and parse it
+    superblock_t* sb = (superblock_t*)SUPERBLOCK_LOC;
+    sb->rootInodePtr = BOOT_FIRST_INODE_LOC + sizeof(inode_t);
+    inode_t* root = (inode_t*)sb->rootInodePtr;
+    loadFile(root, (void*)SCRATCH_BLOCK_LOC);
+
+    inode_t* inode;
+    if ((inode = getInode("kernel.bin", (dirEntry_t*)SCRATCH_BLOCK_LOC)) == NULL) {
+        // kernel.bin doesn't exist??? very bad -> error
+        bigError(0xDEAD);
+    } else { loadFile(inode, (void*)KERNEL_LOC); }
+
+    font_t* font = (font_t*)FONT_LOC;
+    if ((inode = getInode("term16n.fnt", (dirEntry_t*)SCRATCH_BLOCK_LOC)) != NULL) {
+        loadFile(inode, font);
+    } else if ((inode = getInode("testfont.fnt", (dirEntry_t*)SCRATCH_BLOCK_LOC)) != NULL) {
+        loadFile(inode, font);
+    } else {
+        // No font found, bad.
+        bigError(0xBeef);
+    }
+
+    // Virtual memory manager setup
+    if (setupVirtualMemoryManager() != 0) {
+        bigError(0xCafe);
+    }
+
+    // Identity map VBE framebuffer
+    uint32_t fbSize = (gfxMode->yRes * gfxMode->linearBytesPerScanline) / PAGE_SIZE;
+    if (fbSize % PAGE_SIZE > 0) { fbSize++; }
+    fbSize *= 2; // Double for hardware
+    for (uint32_t i = 0, fbStart = gfxMode->physicalBasePtr; i < fbSize; i++, fbStart += PAGE_SIZE) {
+        mapPage((void*)fbStart, (void*)fbStart);
+    }
+    deinitMemoryRegion(gfxMode->physicalBasePtr, fbSize * BLOCK_SIZE);
+
+    *(uint32_t*)PHYS_MEM_MAX_BLOCKS = maxBlocks;
+    *(uint32_t*)PHYS_MEM_USED_BLOCKS = usedBlocks;
+
+    for (uint32_t virt = KERNEL_LOC; virt < 0x400000; virt += PAGE_SIZE) {
+        unmapPage((void*)virt);
+    }
+
+    __asm__ volatile ("movl %cr3, %ecx; movl %ecx, %cr3");
+
+    *(uint32_t*)CURRENT_PAGE_DIR_ADDR = (uint32_t)currentPd;
+
+    // Call/jump to kernel
+    ((void(*)(void))0xC0000000)();
+    bigError(0xffffffff);
+}
+