/* Based off of code from Leonard Kevin McGuire Jr (www.kmcg3413.net) ([email protected]) http://wiki.osdev.org/User:Pancakes/BitmapHeapImplementation */ void main_heap_init() { kheap_init(&main_heap); for (uint8_t i = 0; i < 15; i++) { void * block = memory_alloc_page(0); kheap_add_block(&main_heap, (uint32_t) block, PAGE_SIZE, 16); } }
void kernel_entry (multiboot_info* bootinfo)
{
clear_screen(); puts("Kernel loaded.\n");
gdt_install(); puts("GDT initialised.\n");
idt_install(); puts("IDT initialised.\n");
memman_init(bootinfo);
kheap_init();
fat32_init();
// TODO: figure out how to do it safely
//acpi_init();
apic_init();
ioapic_init(); // keyboard only for now
register_handler(0x21, keyboard_handler);
register_handler(0xD, gpf_handler);
syscalls_init(); // maybe syscalls_init() like acpi_init, apic_init, etc... there should be common naming
timer_init(0x20, 0x002fffff, 0xB, 1); // vector, counter, divider, periodic -- check manual before using
// sets up kernel task and registers handler for timer
scheduler_init();
// registers locking sys
monitor_init();
keyboard_init();
// testing scheduler
if (fork_kernel() == 0)
{
if (!exec("SHELL"))
{
// something horrible happend
// exit()
}
exit();
}
else
{
for(;;)
{
asm volatile("hlt");
}
}
asm ("sti"); // release monsters, it can be set earlier, but fails horribly if set before acpi_init
for(;;);
}
void pmem_init() {
bmap_init(&first_bmap, first_storage, (sizeof(first_storage) * 8));
first_region.bmap = &first_bmap;
first_region.start = 0;
first_region.length = ((first_bmap.bits - (1 /* savety zone */)) * PMEM_PAGESIZE);
first_region.next = NULL;
pmem_region_head = &first_region;
pmem_region_tail = pmem_region_head;
spl_init(&pmem_lock);
/* reserve the page at address zero, as most people don't
* know how to handle it. rm_init() needs to spare this
* page when reserving real mode memory! */
pmem_reserve(0, PMEM_PAGESIZE);
/* from 4K to 0xa0000 (start of kernel memory) for
* real mode */
pmem_reserve(PMEM_PAGESIZE, PMEM_PAGESIZE * 158);
/* reserve the kernel's physical memory, so nobody
* else tries to use it */
if(!pmem_reserve(0xA0000, (((size_t)&_core_lma_end) - 0xA0000))) {
error("failed to protect physical lower and kernel memory\n");
}
/* here we are sufficiently initialized, so virtual memory
* can allocate physical memory for the initial mappings,
* required to get the kernel heap working. this in turn
* enables us, to allocate more memory to add additional
* regions to the physical memory. */
kheap_init();
extp_iterate(EXTP_PMEM_REGION, pmem_iterate_extp);
/* some debugging information */
pmem_region_t* current = pmem_region_head;
while(current) {
trace("pmem: %p - %p (%dKB)\n", current->start,
current->start + current->length, current->length / 1024);
current = current->next;
}
}