65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
#include <base.hpp>
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#include <textDISP.hpp>
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#include <Multitasking.h>
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#include <serial.hpp>
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auto schedule(struct cpu_state* cpu) -> struct cpu_state* {
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return MTGosHAL::tasks.schedule(cpu);
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}
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namespace MTGosHAL {
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Multitasking::Multitasking(): current_task(-1), num_tasks(2)
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{
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task_states[0] = initTask(stack_a, task_a);
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task_states[1] = initTask(stack_b, task_b);
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if(!idt.request(0x20,::schedule)) {
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err << "Could not start multitasking\nFatal error; Kernel halted!\n";
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while(true);
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asm volatile("cli; hlt");
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}
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}
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auto Multitasking::initTask(uint8_t* stck, void(* entry)()) -> struct cpu_state*
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{
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struct cpu_state new_state = {
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0, //EAX
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0, //EBX
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0, //ECX
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0, //EDX
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0, //ESI
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0, //EDI
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0, //EBP
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0, //INTR
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0, //ERROR
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(uint32_t) entry, //EIP
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0x08, //CS
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0x202, // EFLAGS
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(uint32_t) stck, //ESP
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0x10 //SS
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};
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struct cpu_state* state = (struct cpu_state*)(stck+4096-sizeof(new_state));
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*state = new_state;
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return state;
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}
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auto Multitasking::task_a() -> void
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{
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while(true)
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out << "A";
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}
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auto Multitasking::task_b() -> void
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{
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while(true)
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out << "B";
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}
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auto Multitasking::schedule(struct cpu_state* cpu) -> struct cpu_state*
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{
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if(current_task >= 0) {
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task_states[current_task] = cpu;
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}
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current_task++;
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current_task%= num_tasks;
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cpu=task_states[current_task];
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return cpu;
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}
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} // namespace MTGosHAL
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