Added bigError()

include/fs/impl.h

@@ -36,6 +36,7 @@ uint8_t loadFile(inode_t* inode, void* dest) {
 
     if (totalBlocks > 0) {
         // TODO: Indirect extents
+        return 1;
     }
 
     return 0;

include/screen/graphics.h

@@ -26,7 +26,6 @@ void drawLine(int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t color) {
     int8_t sx = (x1 < x2) ? 1 : -1;
     int8_t sy = (y1 < y2) ? 1 : -1;
     int16_t err = dx + dy;
-
     
     // TODO: Sometimes the condition isn't met for some reason and it breaks everything
     while (!(x1 == x2 && y1 == y2)) {

src/stage2.asm

@@ -368,7 +368,7 @@ CODE_SEG equ GDT.codeDescriptor - GDT.start
 DATA_SEG equ GDT.dataDescriptor - GDT.start
 
 ;; VBE Stuff
-;; !! IF YOU WANT TO SELECT ANY VALUE IN THE SETUP, SET THESE TO ZERO !!
+;; XXX IF YOU WANT TO SELECT ANY VALUE IN THE SETUP, SET THESE TO ZERO XXX
 width: dw 1920
 height: dw 1080
 bpp: db 32

src/stage3.c

@@ -6,6 +6,8 @@
 #include <fs/fs.h>
 #include <screen/gfxmode.h>
 
+void bigError();
+
 __attribute__ ((section("entry")))
 void main() {
     // Physical memory manager setup
@@ -27,22 +29,29 @@ void main() {
     deinitMemoryRegion(MEMMAP_AREA, maxBlocks / BLOCKS_PER_BYTE);
 
     // Load root dir, find kernel INode and parse it
-    superblock_t* superblock = (superblock_t*)SUPERBLOCK_LOC;
-    superblock->rootInodePtr = BOOT_FIRST_INODE_LOC + sizeof(inode_t);
-    diskRead(superblock->dataStart * 8, 8, (void*)SCRATCH_BLOCK_LOC);
+    superblock_t* sb = (superblock_t*)SUPERBLOCK_LOC;
+    sb->rootInodePtr = BOOT_FIRST_INODE_LOC + sizeof(inode_t);
+    inode_t* root = (inode_t*)sb->rootInodePtr;
+    diskRead(root->extent[0].block * 8, root->extent[0].length * 8, (void*)SCRATCH_BLOCK_LOC);
 
     inode_t* inode;
     if ((inode = getInode("kernel.bin")) == NULL) {
-        __asm__ volatile ("cli; hlt" : : "a"(0xDeadBeef));
+        // kernel.bin doesn't exist??? very bad -> error
+        bigError(0xDEAD);
     } else { loadFile(inode, (void*)KERNEL_LOC); }
 
-    if ((inode = getInode("term16n.fnt")) == NULL) {
-        __asm__ volatile ("cli; hlt" : : "a"(0xDeadBeef));
-    } else { loadFile(inode, (void*)FONT_LOC); }
+    if ((inode = getInode("term16n.fnt")) != NULL) {
+        loadFile(inode, (void*)FONT_LOC);
+    } else if ((inode = getInode("testfont.fnt")) != NULL) {
+        loadFile(inode, (void*)FONT_LOC);
+    } else {
+        // No font found, bad.
+        bigError(0xBeef);
+    }
 
     // Virtual memory manager setup
     if (setupVirtualMemoryManager() != 0) {
-        while (1);
+        bigError(0xCafe);
     }
 
     // Identity map VBE framebuffer
@@ -67,5 +76,64 @@ void main() {
 
     // Call/jump to kernel
     ((void(*)(void))0xC0000000)();
+    bigError(0xffffffff);
+}
+
+void rect(uint32_t c, uint16_t x, uint16_t y, uint16_t w, uint16_t h) {
+    uint8_t* vidmem = (uint8_t*)gfxMode->physicalBasePtr;
+    uint8_t bytesPerPx = gfxMode->bpp / 8;
+    uint32_t convColor = convertColor(c);
+
+    for (uint32_t dx = 0; dx < w; dx++) {
+        for (uint32_t dy = 0; dy < h; dy++) {
+            uint32_t offset = (((y + dy) * gfxMode->xRes) + (x + dx)) * bytesPerPx;
+
+            for (uint8_t i = 0; i < gfxMode->bpp; i++) {
+                vidmem[offset + i] = (uint8_t)(convColor >> (i*8));
+            }
+        }
+    }
+}
+
+/*
+ * Something went VERY wrong. 
+ * Eg. kernel.bin is missing, no filesystem, Virtual Memory failed, etc.
+ */
+void bigError(uint32_t err) {
+    // Red BG
+    rect(0x00ff0000, 0, 0, gfxMode->xRes, gfxMode->yRes);
+    // E
+    rect(0x00ffffff, 20, 10, 10, 50);
+    rect(0x00ffffff, 30, 10, 30, 10);
+    rect(0x00ffffff, 30, 30, 30, 10);
+    rect(0x00ffffff, 30, 50, 30, 10);
+    // R
+    rect(0x00ffffff, 70, 10, 10, 50);
+    rect(0x00ffffff, 70, 10, 30, 10);
+    rect(0x00ffffff, 70, 30, 30, 10);
+    rect(0x00ffffff, 90, 10, 10, 30);
+    rect(0x00ffffff, 80, 40, 10, 10);
+    rect(0x00ffffff, 90, 50, 10, 10);
+    // R
+    rect(0x00ffffff, 110, 10, 10, 50);
+    rect(0x00ffffff, 110, 10, 30, 10);
+    rect(0x00ffffff, 110, 30, 30, 10);
+    rect(0x00ffffff, 130, 10, 10, 30);
+    rect(0x00ffffff, 120, 40, 10, 10);
+    rect(0x00ffffff, 130, 50, 10, 10);
+    // O
+    rect(0x00ffffff, 150, 10, 10, 50);
+    rect(0x00ffffff, 170, 10, 10, 50);
+    rect(0x00ffffff, 150, 10, 30, 10);
+    rect(0x00ffffff, 150, 50, 30, 10);
+    // R
+    rect(0x00ffffff, 190, 10, 10, 50);
+    rect(0x00ffffff, 190, 10, 30, 10);
+    rect(0x00ffffff, 190, 30, 30, 10);
+    rect(0x00ffffff, 210, 10, 10, 30);
+    rect(0x00ffffff, 200, 40, 10, 10);
+    rect(0x00ffffff, 210, 50, 10, 10);
+
+    __asm__ volatile ("cli; hlt" :: "a"(err));
 }