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#include <atomic.h>
#include <paging.h>
#include <libk/stdio.h>
#include <apic.h>
#include <ioapic.h>
#include <madt.h>
#include <timer.h>
mutex_t cnt_lock;
uint32_t cnt = 0;
uint32_t ioapic_addr = 0;
uint64_t lapic_addr = 0;
uint32_t numcores = 0;
uint8_t cpu_apic_ids[256];
uint8_t curr_cpu_apic_id()
{
uint8_t apic_id = 0;
__asm__ __volatile__ ("movl $1, %%eax; cpuid; shrl $24, %%ebx;": "=b"(apic_id));
return apic_id;
}
void init_ap_cpus()
{
uint8_t bspid = curr_cpu_apic_id();
uint8_t* bspdone = (uint8_t*)0x3000100;
uint8_t* aprunning = (uint8_t*)0x3000200;
*bspdone = 0;
*aprunning = 0;
init_mutex(&cnt_lock);
map_addr(lapic_addr, lapic_addr, FLAG_PRESENT);
for(size_t i = 0; i < numcores; i++) {
// do not start BSP, that's already running this code
if(cpu_apic_ids[i] == bspid)
continue;
printf("initializing cpu with apic id 0x%x\n", cpu_apic_ids[i]);
// send INIT IPI
// clear APIC errors
*((volatile uint32_t*)(lapic_addr + 0x280)) = 0;
// select AP
*((volatile uint32_t*)(lapic_addr + 0x310)) = (*((volatile uint32_t*)(lapic_addr + 0x310)) & 0x00ffffff) | ((uint32_t)cpu_apic_ids[i] << 24);
// trigger INIT IPI
*((volatile uint32_t*)(lapic_addr + 0x300)) = (*((volatile uint32_t*)(lapic_addr + 0x300)) & 0xfff00000) | 0x00C500;
// wait for delivery
do { __asm__ __volatile__ ("pause" : : : "memory"); }while(*((volatile uint32_t*)(uint64_t)(lapic_addr + 0x300)) & (1 << 12));
// select AP
*((volatile uint32_t*)(lapic_addr + 0x310)) = (*((volatile uint32_t*)(lapic_addr + 0x310)) & 0x00ffffff) | ((uint32_t)cpu_apic_ids[i] << 24);
// deassert
*((volatile uint32_t*)(lapic_addr + 0x300)) = (*((volatile uint32_t*)(lapic_addr + 0x300)) & 0xfff00000) | 0x008500;
// wait for delivery
do { __asm__ __volatile__ ("pause" : : : "memory"); }while(*((volatile uint32_t*)(uint64_t)(lapic_addr + 0x300)) & (1 << 12));
// wait 10 msec
wait(10);
// send STARTUP IPI (twice)
for(size_t j = 0; j < 2; j++) {
// clear APIC errors
*((volatile uint32_t*)(lapic_addr + 0x280)) = 0;
// select AP
*((volatile uint32_t*)(lapic_addr + 0x310)) = (*((volatile uint32_t*)(lapic_addr + 0x310)) & 0x00ffffff) | ((uint32_t)cpu_apic_ids[i] << 24);
// trigger STARTUP IPI for 0800:0000
*((volatile uint32_t*)(lapic_addr + 0x300)) = (*((volatile uint32_t*)(lapic_addr + 0x300)) & 0xfff0f800) | 0x000608;
// wait 200 usec
wait(1);
// wait for delivery
do { __asm__ __volatile__ ("pause" : : : "memory"); }while(*((volatile uint32_t*)(uint64_t)(lapic_addr + 0x300)) & (1 << 12));
}
}
*bspdone = 1;
wait(100);
printf("aprunning: %d\n", *aprunning);
printf("cnt: %d\n", cnt);
}
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