fixed issues when running on hardware

compile_commands.json

@@ -1,53 +1,19 @@
 [
   {
-    "file": "kernel/drivers/iso/iso.c",
     "arguments": [
       "/home/slinky/opt/cross/bin/i686-elf-gcc",
       "-c",
-      "kernel/drivers/iso/iso.c",
-      "-o",
-      "obj/kernel/drivers/iso/iso.o",
       "-ffreestanding",
       "-O2",
       "-Wall",
       "-Wextra",
-      "-Ikernel"
-    ],
-    "directory": "/home/slinky/source/RockOS",
-    "output": "obj/kernel/drivers/iso/iso.o"
-  },
-  {
-    "file": "kernel/kmain.c",
-    "arguments": [
-      "/home/slinky/opt/cross/bin/i686-elf-gcc",
-      "-c",
-      "kernel/kmain.c",
+      "-Ikernel",
       "-o",
-      "obj/kernel/kmain.o",
-      "-ffreestanding",
-      "-O2",
-      "-Wall",
-      "-Wextra",
-      "-Ikernel"
+      "obj/kernel/boot/boot.o",
+      "kernel/boot/boot.S"
     ],
     "directory": "/home/slinky/source/RockOS",
-    "output": "obj/kernel/kmain.o"
-  },
-  {
-    "file": "kernel/drivers/pic/pic_stubs.S",
-    "arguments": [
-      "/home/slinky/opt/cross/bin/i686-elf-gcc",
-      "-c",
-      "kernel/drivers/pic/pic_stubs.S",
-      "-o",
-      "obj/kernel/drivers/pic/pic_stubs.o",
-      "-ffreestanding",
-      "-O2",
-      "-Wall",
-      "-Wextra",
-      "-Ikernel"
-    ],
-    "directory": "/home/slinky/source/RockOS",
-    "output": "obj/kernel/drivers/pic/pic_stubs.o"
+    "file": "/home/slinky/source/RockOS/kernel/boot/boot.S",
+    "output": "/home/slinky/source/RockOS/obj/kernel/boot/boot.o"
   }
 ]

kernel/kmain.c

@@ -117,8 +117,6 @@ void kmain(uint32_t magic, multiboot_info* mbi)  {
   uint32_t mmap_virtual_addr = mbi->mmap_addr + 0xC0000000;
   kprintf("mmap virtual address: 0x%x\n", mmap_virtual_addr);
   init_pmm((void*)mmap_virtual_addr, mbi->mmap_length);
-  uint32_t mem_size = total_free_memory();
-  kprintf("Total available memory: %d MB\n", mem_size / 1024 / 1024);
 
   kprintf("RockOS booting...\n");
   init_gdt();

kernel/memory/mm.c

@@ -1,4 +1,5 @@
 #include "memory/mm.h"
+#include "lib/print.h"
 #include "multiboot.h"
 
 #include <stddef.h>
@@ -61,6 +62,7 @@ static void parse_multiboot_mmap(void* base, uint32_t limit) {
             uint32_t usable_start, usable_end, usable_size;
             usable_size = align(region_start, entry->len, &usable_start, &usable_end);
             if (usable_size <=  4096) {
+                entry = (multiboot_mmap_entry*)((uint32_t)entry + entry_size);
                 continue;
             }
 
@@ -139,6 +141,8 @@ void init_pmm(void* mmap_base, uint32_t mmap_limit) {
     if (mmap_base != NULL && mmap_limit > 0) {
         parse_multiboot_mmap(mmap_base, mmap_limit);
     }
+
+    kprintf("total free memory: %dMB\n", total_available_memory / 1024 / 1024);
 }
 
 void init_page_tables() {