int ldr_main(struct multiboot_info* boot_info, uint32 krnldr_size_bytes)
{
SetColor(MakeColor(DARK_BLUE, WHITE));
ClearScreen();
if (krnldr_size_bytes > 40 KB)
PANIC("Kernel Loader is too large");
init_kallocations(KRN_LDR_BASE + krnldr_size_bytes, KRN_LDR_LIMIT);
Print("Initializing descriptor tables.");
INT_OFF;
init_isr();
init_descriptor_tables();
init_pic();
INT_ON;
init_pit_timer(50, timer_callback);
struct kernel_info* k_info = kalloc(sizeof(struct kernel_info));
//setup AHCI
HBA_MEM_t* abar = PCIFindAHCI();
// initialize basic virtual memory
vmmngr_initialize();
uint32 ahci_base = kalloc_get_ptr() + 1024 - (uint32)kalloc_get_ptr() % 1024;
init_ahci(abar, ahci_base);
uint32 start, _length, position = 0;
fsysSimpleFind("MeOs.exe", 1, &_length, &start);
if (start == (uint32)-1 && _length == 0)
PANIC("Kernel module could not be found!");
while (position <= _length)
{
fsysSimpleRead(start + position / 512, 4096, KERNEL_BASE + position);
position += 4096;
}
// after all the loading is done... enable paging
vmmngr_paging_enable(true);
k_info->kernel_size = _length;
k_info->isr_handlers = interrupt_handlers;
k_info->gdt_base = gdt_entries;
k_info->idt_base = idt_entries;
printfln("Executing kernel\0");
execute_kernel(boot_info, k_info);
ClearScreen();
_asm cli
_asm hlt
}
struct pci_dev *add_pci_device(int bus, int dev, int func)
{
struct pci_dev *ret;
uint32 vend_id,dev_id,class,subclass,prog,rev_id,subsys,subsysvend,header,intr,intrl;
uint32 bar_save,bar_addr,bits,pref;
int bar;
int tmp,off;
dev_id = pci_read_conf16(bus,dev,func,PCI_DEVICE_ID);
vend_id = pci_read_conf16(bus,dev,func,PCI_VENDOR_ID);
class = pci_read_conf8(bus,dev,func,PCI_CLASS_CODE+2);
subclass = pci_read_conf8(bus,dev,func,PCI_CLASS_CODE+1);
prog = pci_read_conf8(bus,dev,func,PCI_CLASS_CODE);
if(class == 0xff && subclass == 0xff) return NULL;
rev_id = pci_read_conf8(bus,dev,func,PCI_REV_ID);
subsys = pci_read_conf16(bus,dev,func,PCI_SUB_ID);
subsysvend = pci_read_conf16(bus,dev,func,PCI_SUB_VENDOR_ID);
header = pci_read_conf8(bus,dev,func,PCI_HEADER_TYPE); // was 0x0d
intr = pci_read_conf8(bus,dev,func,PCI_INT_PIN);
intrl = pci_read_conf8(bus,dev,func,PCI_INT_LINE);
/*
printf("add_pci_dev: %x.%x.%x: %x:%x- %x.%x.%x: "
"type:%x rev:%x int:%x/%x sub:%x:%x"
"\n",
bus, dev, func,
vend_id, dev_id,
class, subclass, prog,
header, rev_id,
intr, intrl,
subsysvend, subsys);
*/
if(header != 0x80 && header != 0x00 ) {
printf("add_pci: %x:%x does not support header=%x PCI-to-PCI/Cardbus\n", vend_id, dev_id, header);
return NULL;
}
ret = kmalloc(sizeof(struct pci_dev),"pcidev", NULL);
if(!ret) return NULL;
ret->cfg.vendor_id = vend_id;
ret->cfg.device_id = dev_id;
ret->cfg.rev = rev_id;
ret->cfg.class_code = class;
ret->cfg.subclass = subclass;
ret->cfg.progif = prog;
ret->cfg.header_type = header;
ret->cfg.sub_vendor_id = subsysvend;
ret->cfg.sub_id = subsys;
ret->cfg.int_line = intrl;
ret->cfg.int_pin = intr;
ret->bus = bus;
ret->dev = dev;
ret->func = func;
for(bar=0;bar<PCI_NUM_BARS;bar++) {
bar_save = bar_addr = pci_read_conf32(bus,dev,func,PCI_BAR(bar));
if(bar_addr == 0x0) {
continue;
} else if(bar_addr & 1) { // IO
ret->bars[bar].mem = false;
bar_addr &= 0xfffffffc;
//printf("add_pci_dev:\tbar[%x] IO @ %x ", bar, bar_addr);
ret->bars[bar].addr = bar_addr;
pci_write_conf32(bus,dev,func,PCI_BAR(bar),0xffffffff);
bar_addr = pci_read_conf32(bus,dev,func,PCI_BAR(bar));
bar_addr &= 0xfffffffc;
//printf(" len:%x\n", (~bar_addr)+1);
ret->bars[bar].len = (~bar_addr)+1;
pci_write_conf32(bus,dev,func,PCI_BAR(bar), bar_save);
} else { // MEM
ret->bars[bar].mem = true;
ret->bars[bar].un.mem.bits = bits = (bar_addr & 0x06) >> 1;
ret->bars[bar].un.mem.prefs = pref = (bar_addr & 0x08) >> 3;
if(bits) {
printf("PCI: non-32bit BARs unsupported");
bar = PCI_NUM_BARS;
continue;
}
bar_addr &= 0xfffffff0;
//printf("add_pci_dev:\tbar[%x] MEM @ %x (%xb) %s",
// bar, bar_addr, bits, pref ? "pre" : "");
ret->bars[bar].addr = bar_addr;
pci_write_conf32(bus,dev,func,PCI_BAR(bar),0xffffffff);
bar_addr = pci_read_conf32(bus,dev,func,PCI_BAR(bar));
bar_addr &= 0xfffffff0;
//printf(" len:%x\n", (~bar_addr)+1);
ret->bars[bar].len = (~bar_addr)+1;
pci_write_conf32(bus,dev,func,PCI_BAR(bar), bar_save);
tmp = ret->bars[bar].len;
off = 0;
while(tmp>0) {
create_page_entry_4k(kernel_pd,
ret->bars[bar].addr + off,
ret->bars[bar].addr + off,
PEF_P|PEF_W, NULL);
tmp -= PGSIZE_4K;
off += PGSIZE_4K;
}
}
}
ret->next = pci_devs;
pci_devs = ret;
// if(ret->cfg.int_line && ret->cfg.int_pin) {
// idt_set_gate(0x20 + ret->cfg.int_line,
// (unsigned long)pci_int_handler, _KERNEL_CS, GDT_TYPE_INT, 0);
// }
print_pci_dev(ret);
switch(ret->cfg.vendor_id) {
case PCI_VENDOR_AMD:
switch(ret->cfg.device_id) {
case PCI_DEVICE_PCNET:
init_nic_pcnet(ret);
break;
default:
goto unknown;
}
break;
case PCI_VENDOR_INTEL:
switch(ret->cfg.device_id) {
case PCI_DEVICE_PIIX3:
case PCI_DEVICE_PIIX4:
if(ret->cfg.class_code == PCI_CLASS_MASS_STORAGE); {
init_ide(ret);
goto unknown;
break;
}
goto unknown;
break;
case PCI_DEVICE_828011_AHCI:
init_ahci(ret);
break;
default:
goto unknown;
}
break;
default:
goto unknown;
}
return(ret);
unknown:
return(ret);
}