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#include "Task.ns.h"
#include <Library/Vector.class.h>
//From Task.wtf.asm
extern "C" u32int read_eip();
extern "C" u32int idle_task();
namespace Task {
Vector <Process*> processes; //TODO : use a linked list instead
Vector <Thread*> threads;
Thread* currentThread = NULL;
Process* currentProcess = NULL;
Thread* idleThread = NULL;
u32int currentThreadId = 0;
u32int nextpid = 1;
void initialize(String cmdline, VirtualTerminal *vt) {
asm volatile ("cli");
threads.clear();
processes.clear();
currentProcess = Process::createKernel(cmdline, vt);
idleThread = new Thread(idle_task, true);
currentThread = threads[0];
currentThreadId = 0;
asm volatile ("sti");
}
Thread* nextThread() {
u32int nid = currentThreadId;
while (1) {
nid++;
if (nid >= threads.size()) nid = 0;
if (threads[nid]->runnable() and threads[nid] != idleThread) {
currentThreadId = nid;
return threads[nid];
}
if (nid == currentThreadId) break;
}
return idleThread;
}
void doSwitch() {
if (currentThread == NULL or currentProcess == NULL) return;
u32int esp, ebp, eip, cr3;
asm volatile("mov %%esp, %0" : "=r"(esp));
asm volatile("mov %%ebp, %0" : "=r"(ebp));
eip = read_eip();
if (eip == 0x12345)
return;
if ((u32int)currentThread != 0xFFFFFFFF) currentThread->setState(esp, ebp, eip);
currentThread = nextThread();
currentProcess = currentThread->getProcess();
esp = currentThread->getEsp();
ebp = currentThread->getEbp();
eip = currentThread->getEip();
cr3 = currentProcess->getPagedir()->physicalAddr;
asm volatile(" \
cli; \
mov %0, %%ebp; \
mov %1, %%esp; \
mov %2, %%ecx; \
mov %3, %%cr3; \
mov $0x12345, %%eax; \
jmp *%%ecx;"
: : "r"(ebp), "r"(esp), "r"(eip), "r"(cr3));
}
void triggerSwitch() {
asm volatile("int $65");
}
u32int nextPid() {
return nextpid++;
}
bool IRQwakeup(u8int irq) {
bool r = false;
for (u32int i = 0; i < threads.size(); i++) {
r = r or threads[i]->irqHappens(irq);
}
return r;
}
void allocKernelPageTable(u32int id, page_table_t *table, u32int tablePhys) {
if (id < 768) return; //this would be a BUG
for (u32int i = 1; i < processes.size(); i++) {
processes[i]->getPagedir()->tables[id] = table;
processes[i]->getPagedir()->tablesPhysical[id] = tablePhys;
}
}
Process* getKernelProcess() {
return processes[0];
}
void registerThread(Thread* t) {
unregisterThread(t); //...//
threads.push(t);
}
void unregisterThread(Thread* t) {
for (u32int i = 0; i < threads.size(); i++) {
if (threads[i] == t) {
threads[i] = threads.back();
threads.pop();
return;
}
}
}
void registerProcess(Process* p) {
unregisterProcess(p); //...//
processes.push(p);
}
void unregisterProcess(Process* p) {
for (u32int i = 0; i < processes.size(); i++) {
if (processes[i] == p) {
processes[i] = processes.back();
processes.pop();
return;
}
}
}
}
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