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sortix--sortix/kernel/x86-family/interrupt.cpp
Jonas 'Sortie' Termansen 9f1965f36e Prioritize the interrupt worker thread.
2017-05-18 22:40:46 +02:00

369 lines
12 KiB
C++
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/*
* Copyright (c) 2011, 2012, 2013, 2014, 2017 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* x86-family/interrupt.cpp
* Interrupt support for i386 and x86_64 systems.
*/
#include <assert.h>
#include <errno.h>
#include <msr.h>
#include <stdint.h>
#include <string.h>
#include <sortix/kernel/cpu.h>
#include <sortix/kernel/interrupt.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/process.h>
#include <sortix/kernel/scheduler.h>
#include <sortix/kernel/signal.h>
#include <sortix/kernel/syscall.h>
#include <sortix/kernel/thread.h>
#include "gdt.h"
#include "idt.h"
#include "pic.h"
extern "C" void isr0();
extern "C" void isr1();
extern "C" void isr2();
extern "C" void isr3();
extern "C" void isr4();
extern "C" void isr5();
extern "C" void isr6();
extern "C" void isr7();
extern "C" void isr8();
extern "C" void isr9();
extern "C" void isr10();
extern "C" void isr11();
extern "C" void isr12();
extern "C" void isr13();
extern "C" void isr14();
extern "C" void isr15();
extern "C" void isr16();
extern "C" void isr17();
extern "C" void isr18();
extern "C" void isr19();
extern "C" void isr20();
extern "C" void isr21();
extern "C" void isr22();
extern "C" void isr23();
extern "C" void isr24();
extern "C" void isr25();
extern "C" void isr26();
extern "C" void isr27();
extern "C" void isr28();
extern "C" void isr29();
extern "C" void isr30();
extern "C" void isr31();
extern "C" void isr128();
extern "C" void isr130();
extern "C" void isr131();
extern "C" void irq0();
extern "C" void irq1();
extern "C" void irq2();
extern "C" void irq3();
extern "C" void irq4();
extern "C" void irq5();
extern "C" void irq6();
extern "C" void irq7();
extern "C" void irq8();
extern "C" void irq9();
extern "C" void irq10();
extern "C" void irq11();
extern "C" void irq12();
extern "C" void irq13();
extern "C" void irq14();
extern "C" void irq15();
extern "C" void interrupt_handler_null();
extern "C" void syscall_handler();
extern "C" void yield_cpu_handler();
extern "C" void thread_exit_handler();
namespace Sortix {
namespace Interrupt {
extern "C" { unsigned long asm_is_cpu_interrupted = 0; }
const size_t NUM_KNOWN_EXCEPTIONS = 20;
const char* exception_names[] =
{
"Divide by zero", /* 0, 0x0 */
"Debug", /* 1, 0x1 */
"Non maskable interrupt", /* 2, 0x2 */
"Breakpoint", /* 3, 0x3 */
"Into detected overflow", /* 4, 0x4 */
"Out of bounds", /* 5, 0x5 */
"Invalid opcode", /* 6, 0x6 */
"No coprocessor", /* 7, 0x7 */
"Double fault", /* 8, 0x8 */
"Coprocessor segment overrun", /* 9, 0x9 */
"Bad TSS", /* 10, 0xA */
"Segment not present", /* 11, 0xB */
"Stack fault", /* 12, 0xC */
"General protection fault", /* 13, 0xD */
"Page fault", /* 14, 0xE */
"Unknown interrupt", /* 15, 0xF */
"Coprocessor fault", /* 16, 0x10 */
"Alignment check", /* 17, 0x11 */
"Machine check", /* 18, 0x12 */
"SIMD Floating-Point", /* 19, 0x13 */
};
const unsigned int NUM_INTERRUPTS = 256U;
static struct IDT::idt_entry interrupt_table[NUM_INTERRUPTS];
static struct interrupt_handler* interrupt_handlers[NUM_INTERRUPTS];
static struct interrupt_handler Scheduler__InterruptYieldCPU_handler;
static struct interrupt_handler Signal__DispatchHandler_handler;
static struct interrupt_handler Signal__ReturnHandler_handler;
static struct interrupt_handler Scheduler__ThreadExitCPU_handler;
// Temporarily to see if this is the source of the assertion failure.
void DispatchHandlerWrap(struct interrupt_context* intctx, void* user)
{
assert(Interrupt::IsEnabled());
return Signal::DispatchHandler(intctx, user);
}
void RegisterHandler(unsigned int index, struct interrupt_handler* handler)
{
assert(index < NUM_INTERRUPTS);
bool was_enabled = SetEnabled(false);
handler->prev = NULL;
if ( (handler->next = interrupt_handlers[index]) )
handler->next->prev = handler;
interrupt_handlers[index] = handler;
SetEnabled(was_enabled);
}
void UnregisterHandler(unsigned int index, struct interrupt_handler* handler)
{
assert(index < NUM_INTERRUPTS);
bool was_enabled = SetEnabled(false);
if ( handler->prev )
handler->prev->next = handler->next;
else
interrupt_handlers[index] = handler->next;
if ( handler->next )
handler->next->prev = handler->prev;
SetEnabled(was_enabled);
}
static void RegisterRawHandler(unsigned int index,
void (*handler)(void),
bool userspace,
bool preemptive)
{
assert(index < NUM_INTERRUPTS);
addr_t handler_entry = (addr_t) handler;
uint16_t selector = KCS;
uint8_t rpl = userspace ? URPL : KRPL;
uint8_t type = preemptive ? IDT::TYPE_TRAP : IDT::TYPE_INTERRUPT;
uint8_t ist = 0;
uint8_t flags = IDT::FLAG_PRESENT
| type << IDT::FLAG_TYPE_SHIFT
| rpl << IDT::FLAG_DPL_SHIFT;
IDT::SetEntry(&interrupt_table[index], handler_entry, selector, flags, ist);
}
void Init()
{
// Initialize the interrupt table entries to the null interrupt handler.
memset(&interrupt_table, 0, sizeof(interrupt_table));
for ( unsigned int i = 0; i < NUM_INTERRUPTS; i++ )
RegisterRawHandler(i, interrupt_handler_null, false, false);
// Remap the IRQ table on the PICs.
PIC::ReprogramPIC();
RegisterRawHandler(0, isr0, false, false);
RegisterRawHandler(1, isr1, false, false);
RegisterRawHandler(2, isr2, false, false);
RegisterRawHandler(3, isr3, false, false);
RegisterRawHandler(4, isr4, false, false);
RegisterRawHandler(5, isr5, false, false);
RegisterRawHandler(6, isr6, false, false);
RegisterRawHandler(7, isr7, false, false);
RegisterRawHandler(8, isr8, false, false);
RegisterRawHandler(9, isr9, false, false);
RegisterRawHandler(10, isr10, false, false);
RegisterRawHandler(11, isr11, false, false);
RegisterRawHandler(12, isr12, false, false);
RegisterRawHandler(13, isr13, false, false);
RegisterRawHandler(14, isr14, false, false);
RegisterRawHandler(15, isr15, false, false);
RegisterRawHandler(16, isr16, false, false);
RegisterRawHandler(17, isr17, false, false);
RegisterRawHandler(18, isr18, false, false);
RegisterRawHandler(19, isr19, false, false);
RegisterRawHandler(20, isr20, false, false);
RegisterRawHandler(21, isr21, false, false);
RegisterRawHandler(22, isr22, false, false);
RegisterRawHandler(23, isr23, false, false);
RegisterRawHandler(24, isr24, false, false);
RegisterRawHandler(25, isr25, false, false);
RegisterRawHandler(26, isr26, false, false);
RegisterRawHandler(27, isr27, false, false);
RegisterRawHandler(28, isr28, false, false);
RegisterRawHandler(29, isr29, false, false);
RegisterRawHandler(30, isr30, false, false);
RegisterRawHandler(31, isr31, false, false);
RegisterRawHandler(32, irq0, false, false);
RegisterRawHandler(33, irq1, false, false);
RegisterRawHandler(34, irq2, false, false);
RegisterRawHandler(35, irq3, false, false);
RegisterRawHandler(36, irq4, false, false);
RegisterRawHandler(37, irq5, false, false);
RegisterRawHandler(38, irq6, false, false);
RegisterRawHandler(39, irq7, false, false);
RegisterRawHandler(40, irq8, false, false);
RegisterRawHandler(41, irq9, false, false);
RegisterRawHandler(42, irq10, false, false);
RegisterRawHandler(43, irq11, false, false);
RegisterRawHandler(44, irq12, false, false);
RegisterRawHandler(45, irq13, false, false);
RegisterRawHandler(46, irq14, false, false);
RegisterRawHandler(47, irq15, false, false);
RegisterRawHandler(128, syscall_handler, true, true);
RegisterRawHandler(129, yield_cpu_handler, true, false);
RegisterRawHandler(130, isr130, false, true);
RegisterRawHandler(131, isr131, true, true);
RegisterRawHandler(132, thread_exit_handler, true, false);
Scheduler__InterruptYieldCPU_handler.handler = Scheduler::InterruptYieldCPU;
RegisterHandler(129, &Scheduler__InterruptYieldCPU_handler);
Signal__DispatchHandler_handler.handler = DispatchHandlerWrap;
RegisterHandler(130, &Signal__DispatchHandler_handler);
Signal__ReturnHandler_handler.handler = Signal::ReturnHandler;
RegisterHandler(131, &Signal__ReturnHandler_handler);
Scheduler__ThreadExitCPU_handler.handler = Scheduler::ThreadExitCPU;
RegisterHandler(132, &Scheduler__ThreadExitCPU_handler);
IDT::Set(interrupt_table, NUM_INTERRUPTS);
Interrupt::Enable();
}
const char* ExceptionName(const struct interrupt_context* intctx)
{
if ( intctx->int_no < NUM_KNOWN_EXCEPTIONS )
return exception_names[intctx->int_no];
return "Unknown";
}
uintptr_t ExceptionLocation(const struct interrupt_context* intctx)
{
#if defined(__x86_64__)
return intctx->rip;
#elif defined(__i386__)
return intctx->eip;
#endif
}
__attribute__((noreturn))
void KernelCrashHandler(struct interrupt_context* intctx)
{
Scheduler::SaveInterruptedContext(intctx, &CurrentThread()->registers);
// Panic the kernel with a diagnostic message.
PanicF("Unhandled CPU Exception id %zu `%s' at ip=0x%zx (cr2=0x%zx, "
"err_code=0x%zx)", intctx->int_no, ExceptionName(intctx),
ExceptionLocation(intctx), intctx->cr2, intctx->err_code);
}
void UserCrashHandler(struct interrupt_context* intctx)
{
Scheduler::SaveInterruptedContext(intctx, &CurrentThread()->registers);
// Execute this crash handler with preemption on.
Interrupt::Enable();
// TODO: Also send signals for other types of user-space crashes.
if ( intctx->int_no == 14 /* Page fault */ )
{
struct sigaction* act = &CurrentProcess()->signal_actions[SIGSEGV];
kthread_mutex_lock(&CurrentProcess()->signal_lock);
bool handled = act->sa_handler != SIG_DFL && act->sa_handler != SIG_IGN;
if ( handled )
CurrentThread()->DeliverSignalUnlocked(SIGSEGV);
kthread_mutex_unlock(&CurrentProcess()->signal_lock);
if ( handled )
{
assert(Interrupt::IsEnabled());
return Signal::DispatchHandler(intctx, NULL);
}
}
// Issue a diagnostic message to the kernel log concerning the crash.
Log::PrintF("The current process (pid %ji `%s') crashed and was terminated:\n",
(intmax_t) CurrentProcess()->pid, CurrentProcess()->program_image_path);
Log::PrintF("%s exception at ip=0x%zx (cr2=0x%zx, err_code=0x%zx)\n",
ExceptionName(intctx), ExceptionLocation(intctx), intctx->cr2,
intctx->err_code);
// Exit the process with the right error code.
// TODO: Send a SIGINT, SIGBUS, or whatever instead.
CurrentProcess()->ExitThroughSignal(SIGSEGV);
// Deliver signals to this thread so it can exit correctly.
assert(Interrupt::IsEnabled());
Signal::DispatchHandler(intctx, NULL);
}
extern "C" void interrupt_handler(struct interrupt_context* intctx)
{
unsigned int int_no = intctx->int_no;
// IRQ 7 and 15 might be spurious and might need to be ignored.
if ( int_no == IRQ7 && !(PIC::ReadISR() & (1 << 7)) )
return;
if ( int_no == IRQ15 && !(PIC::ReadISR() & (1 << 15)) )
{
PIC::SendMasterEOI();
return;
}
bool is_in_kernel = (intctx->cs & 0x3) == KRPL;
bool is_in_user = !is_in_kernel;
bool is_crash = int_no < 32 && int_no != 7;
// Invoke the appropriate interrupt handler.
if ( is_crash && is_in_kernel )
KernelCrashHandler(intctx);
else if ( is_crash && is_in_user )
UserCrashHandler(intctx);
else
{
for ( struct interrupt_handler* iter = interrupt_handlers[int_no];
iter;
iter = iter->next )
iter->handler(intctx, iter->context);
}
// Send an end of interrupt signal to the PICs if we got an IRQ.
if ( IRQ0 <= int_no && int_no <= IRQ15 )
PIC::SendEOI(int_no - IRQ0);
if ( interrupt_worker_thread_boost )
{
interrupt_worker_thread_boost = false;
Scheduler::SwitchTo(intctx, interrupt_worker_thread);
}
}
} // namespace Interrupt
} // namespace Sortix
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