Kernel: Fix multiprocessing on x86_64
I did not even start APs after initializing them... :D
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@ -1,3 +1,49 @@
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// arguments in RAX, RBX, RCX, RDX, RSI, RDI
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// System V ABI: RDI, RSI, RDX, RCX, R8, R9
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.global asm_syscall_handler
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asm_syscall_handler:
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pushq %rbx
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pushq %rcx
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pushq %rdx
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pushq %rdi
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pushq %rsi
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pushq %rbp
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pushq %r8
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pushq %r9
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pushq %r10
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pushq %r11
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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movq %rsi, %r8
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movq %rdi, %r9
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movq %rax, %rdi
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movq %rbx, %rsi
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xchgq %rcx, %rdx
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leaq 112(%rsp), %rbx
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pushq %rbx
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call cpp_syscall_handler
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addq $8, %rsp
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rbp
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popq %rsi
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popq %rdi
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popq %rdx
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popq %rcx
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popq %rbx
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iretq
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.global sys_fork_trampoline
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sys_fork_trampoline:
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pushq %rbx
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@ -34,23 +34,6 @@
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popq %rax
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.endm
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.macro popaq_no_rax
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rdi
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popq %rsi
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popq %rbp
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popq %rbx
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popq %rdx
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popq %rcx
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.endm
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isr_stub:
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pushaq
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@ -78,6 +61,15 @@ irq_stub:
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addq $16, %rsp
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iretq
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.global asm_yield_handler
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asm_yield_handler:
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pushaq
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leaq 120(%rsp), %rdi # interrupt stack ptr
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movq %rsp, %rsi # interrupt register ptr
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call cpp_yield_handler
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popaq
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iretq
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.macro isr n
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.global isr\n
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isr\n:
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@ -166,31 +158,4 @@ irq 28
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irq 29
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irq 30
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irq 31
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.global asm_reschedule_handler
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asm_reschedule_handler:
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pushaq
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leaq 120(%rsp), %rdi # interrupt stack ptr
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movq %rsp, %rsi # interrupt register ptr
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call cpp_reschedule_handler
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popaq
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iretq
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// arguments in RAX, RBX, RCX, RDX, RSI, RDI
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// System V ABI: RDI, RSI, RDX, RCX, R8, R9
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.global syscall_asm
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syscall_asm:
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pushaq
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movq %rsi, %r8
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movq %rdi, %r9
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movq %rax, %rdi
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movq %rbx, %rsi
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xchgq %rcx, %rdx
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movq %rsp, %rbx
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addq $120, %rbx
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pushq %rbx
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call cpp_syscall_handler
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addq $8, %rsp
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popaq_no_rax
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addq $8, %rsp
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iretq
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irq 32
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@ -9,6 +9,7 @@
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constexpr uint8_t IRQ_VECTOR_BASE = 0x20;
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constexpr uint8_t IRQ_IPI = 32;
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constexpr uint8_t IRQ_YIELD = 33;
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namespace Kernel
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{
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@ -12,7 +12,6 @@ namespace Kernel
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public:
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static BAN::ErrorOr<void> initialize();
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static Scheduler& get();
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static bool is_started();
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[[noreturn]] void start();
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@ -10,7 +10,7 @@
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#include <kernel/Timer/PIT.h>
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#define ISR_LIST_X X(0) X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15) X(16) X(17) X(18) X(19) X(20) X(21) X(22) X(23) X(24) X(25) X(26) X(27) X(28) X(29) X(30) X(31)
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#define IRQ_LIST_X X(0) X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15) X(16) X(17) X(18) X(19) X(20) X(21) X(22) X(23) X(24) X(25) X(26) X(27) X(28) X(29) X(30) X(31)
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#define IRQ_LIST_X X(0) X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15) X(16) X(17) X(18) X(19) X(20) X(21) X(22) X(23) X(24) X(25) X(26) X(27) X(28) X(29) X(30) X(31) X(32)
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namespace Kernel
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{
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@ -329,8 +329,10 @@ done:
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return;
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}
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extern "C" void cpp_reschedule_handler(InterruptStack* interrupt_stack, InterruptRegisters* interrupt_registers)
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extern "C" void cpp_yield_handler(InterruptStack* interrupt_stack, InterruptRegisters* interrupt_registers)
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{
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ASSERT(!InterruptController::get().is_in_service(IRQ_YIELD));
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Processor::enter_interrupt(interrupt_stack, interrupt_registers);
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Scheduler::get().irq_reschedule();
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Processor::leave_interrupt();
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@ -346,8 +348,6 @@ done:
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asm volatile("cli; 1: hlt; jmp 1b");
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}
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ASSERT(irq != IRQ_IPI);
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if (!InterruptController::get().is_in_service(irq))
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dprintln("spurious irq 0x{2H}", irq);
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else
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@ -355,6 +355,8 @@ done:
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InterruptController::get().eoi(irq);
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if (auto* handler = s_interruptables[irq])
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handler->handle_irq();
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else if (irq == IRQ_IPI)
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Scheduler::get().yield();
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else
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dprintln("no handler for irq 0x{2H}", irq);
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}
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@ -400,8 +402,8 @@ done:
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IRQ_LIST_X
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#undef X
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extern "C" void asm_reschedule_handler();
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extern "C" void syscall_asm();
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extern "C" void asm_yield_handler();
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extern "C" void asm_syscall_handler();
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IDT* IDT::create()
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{
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@ -418,9 +420,9 @@ done:
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IRQ_LIST_X
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#undef X
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idt->register_interrupt_handler(IRQ_VECTOR_BASE + IRQ_IPI, asm_reschedule_handler);
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idt->register_interrupt_handler(IRQ_VECTOR_BASE + IRQ_YIELD, asm_yield_handler);
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idt->register_syscall_handler(0x80, syscall_asm);
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idt->register_syscall_handler(0x80, asm_syscall_handler);
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return idt;
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}
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@ -12,7 +12,6 @@ namespace Kernel
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{
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static Scheduler* s_instance = nullptr;
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static BAN::Atomic<bool> s_started { false };
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BAN::ErrorOr<void> Scheduler::initialize()
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{
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@ -33,13 +32,12 @@ namespace Kernel
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{
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ASSERT(Processor::get_interrupt_state() == InterruptState::Disabled);
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ASSERT(!m_active_threads.empty());
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yield();
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ASSERT_NOT_REACHED();
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}
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bool Scheduler::is_started()
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{
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return s_started;
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// broadcast ipi (yield) for each processor
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InterruptController::get().broadcast_ipi();
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yield();
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ASSERT_NOT_REACHED();
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}
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Thread& Scheduler::current_thread()
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@ -122,20 +120,21 @@ namespace Kernel
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void Scheduler::timer_reschedule()
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{
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// Broadcast IPI to all other processors for them
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// to perform reschedule
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InterruptController::get().broadcast_ipi();
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{
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SpinLockGuard _(m_lock);
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m_blocking_threads.remove_with_wake_time(m_active_threads, SystemTimer::get().ms_since_boot());
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}
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// Broadcast IPI to all other processors for them
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// to perform reschedule
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InterruptController::get().broadcast_ipi();
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yield();
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}
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void Scheduler::yield()
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{
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ASSERT(!m_lock.current_processor_has_lock());
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auto state = Processor::get_interrupt_state();
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Processor::set_interrupt_state(InterruptState::Disabled);
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@ -143,24 +142,24 @@ namespace Kernel
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asm volatile(
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"movq %%rsp, %%rcx;"
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"movq %[load_sp], %%rsp;"
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"int %[ipi];"
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"int %[yield];"
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"movq %%rcx, %%rsp;"
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// NOTE: This is offset by 2 pointers since interrupt without PL change
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// does not push SP and SS. This allows accessing "whole" interrupt stack.
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:: [load_sp]"r"(Processor::current_stack_top() - 2 * sizeof(uintptr_t)),
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[ipi]"i"(IRQ_VECTOR_BASE + IRQ_IPI)
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[yield]"i"(IRQ_VECTOR_BASE + IRQ_YIELD)
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: "memory", "rcx"
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);
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#elif ARCH(i686)
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asm volatile(
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"movl %%esp, %%ecx;"
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"movl %[load_sp], %%esp;"
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"int %[ipi];"
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"int %[yield];"
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"movl %%ecx, %%esp;"
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// NOTE: This is offset by 2 pointers since interrupt without PL change
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// does not push SP and SS. This allows accessing "whole" interrupt stack.
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:: [load_sp]"r"(Processor::current_stack_top() - 2 * sizeof(uintptr_t)),
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[ipi]"i"(IRQ_VECTOR_BASE + IRQ_IPI)
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[yield]"i"(IRQ_VECTOR_BASE + IRQ_YIELD)
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: "memory", "ecx"
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);
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#else
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@ -265,7 +265,7 @@ namespace Kernel
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m_interrupt_stack.ip = reinterpret_cast<vaddr_t>(start_kernel_thread);
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m_interrupt_stack.cs = 0x08;
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m_interrupt_stack.flags = 0x202;
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m_interrupt_stack.flags = 0x002;
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m_interrupt_stack.sp = kernel_stack_top() - 4 * sizeof(uintptr_t);
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m_interrupt_stack.ss = 0x10;
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@ -218,7 +218,9 @@ extern "C" void ap_main()
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dprintln("ap{} initialized", Processor::current_id());
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while (!Scheduler::is_started())
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__builtin_ia32_pause();
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Scheduler::get().start();
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// wait until scheduler is started and we get irq for reschedule
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Processor::set_interrupt_state(InterruptState::Enabled);
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while (true)
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asm volatile("hlt");
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ASSERT_NOT_REACHED();
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}
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