Refactored the interrupt code to make it cleaner and more flexible.
Added support for hooking directly into an interrupt with your own interrupt handler.
This commit is contained in:
Jonas 'Sortie' Termansen
parent
7ebed6dd6a
commit
0e48b23429
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@ -1,6 +1,6 @@
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/******************************************************************************
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/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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This file is part of Sortix.
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@ -14,13 +14,13 @@
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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descriptor_tables.cpp
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Initializes and handles the GDT, TSS and IDT.
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******************************************************************************/
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*******************************************************************************/
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#include "platform.h"
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#include <libmaxsi/memory.h>
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@ -183,57 +183,10 @@ namespace Sortix
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CPU::OutPortB(0xA1, 0x01);
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CPU::OutPortB(0x21, 0x0);
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CPU::OutPortB(0xA1, 0x0);
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}
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SetGate( 0, (addr_t) isr0 , 0x08, 0x8E);
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SetGate( 1, (addr_t) isr1 , 0x08, 0x8E);
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SetGate( 2, (addr_t) isr2 , 0x08, 0x8E);
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SetGate( 3, (addr_t) isr3 , 0x08, 0x8E);
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SetGate( 4, (addr_t) isr4 , 0x08, 0x8E);
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SetGate( 5, (addr_t) isr5 , 0x08, 0x8E);
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SetGate( 6, (addr_t) isr6 , 0x08, 0x8E);
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SetGate( 7, (addr_t) isr7 , 0x08, 0x8E);
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SetGate( 8, (addr_t) isr8 , 0x08, 0x8E);
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SetGate( 9, (addr_t) isr9 , 0x08, 0x8E);
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SetGate(10, (addr_t) isr10, 0x08, 0x8E);
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SetGate(11, (addr_t) isr11, 0x08, 0x8E);
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SetGate(12, (addr_t) isr12, 0x08, 0x8E);
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SetGate(13, (addr_t) isr13, 0x08, 0x8E);
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SetGate(14, (addr_t) isr14, 0x08, 0x8E);
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SetGate(15, (addr_t) isr15, 0x08, 0x8E);
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SetGate(16, (addr_t) isr16, 0x08, 0x8E);
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SetGate(17, (addr_t) isr17, 0x08, 0x8E);
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SetGate(18, (addr_t) isr18, 0x08, 0x8E);
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SetGate(19, (addr_t) isr19, 0x08, 0x8E);
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SetGate(20, (addr_t) isr20, 0x08, 0x8E);
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SetGate(21, (addr_t) isr21, 0x08, 0x8E);
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SetGate(22, (addr_t) isr22, 0x08, 0x8E);
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SetGate(23, (addr_t) isr23, 0x08, 0x8E);
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SetGate(24, (addr_t) isr24, 0x08, 0x8E);
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SetGate(25, (addr_t) isr25, 0x08, 0x8E);
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SetGate(26, (addr_t) isr26, 0x08, 0x8E);
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SetGate(27, (addr_t) isr27, 0x08, 0x8E);
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SetGate(28, (addr_t) isr28, 0x08, 0x8E);
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SetGate(29, (addr_t) isr29, 0x08, 0x8E);
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SetGate(30, (addr_t) isr30, 0x08, 0x8E);
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SetGate(31, (addr_t) isr31, 0x08, 0x8E);
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SetGate(32, (addr_t) irq0, 0x08, 0x8E);
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SetGate(33, (addr_t) irq1, 0x08, 0x8E);
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SetGate(34, (addr_t) irq2, 0x08, 0x8E);
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SetGate(35, (addr_t) irq3, 0x08, 0x8E);
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SetGate(36, (addr_t) irq4, 0x08, 0x8E);
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SetGate(37, (addr_t) irq5, 0x08, 0x8E);
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SetGate(38, (addr_t) irq6, 0x08, 0x8E);
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SetGate(39, (addr_t) irq7, 0x08, 0x8E);
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SetGate(40, (addr_t) irq8, 0x08, 0x8E);
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SetGate(41, (addr_t) irq9, 0x08, 0x8E);
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SetGate(42, (addr_t) irq10, 0x08, 0x8E);
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SetGate(43, (addr_t) irq11, 0x08, 0x8E);
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SetGate(44, (addr_t) irq12, 0x08, 0x8E);
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SetGate(45, (addr_t) irq13, 0x08, 0x8E);
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SetGate(46, (addr_t) irq14, 0x08, 0x8E);
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SetGate(47, (addr_t) irq15, 0x08, 0x8E);
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SetGate(128, (addr_t) syscall_handler, 0x08, 0x8E | 0x60); // System Calls
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void Flush()
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{
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idt_flush((addr_t) &idt_ptr);
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}
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@ -1,6 +1,6 @@
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/******************************************************************************
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/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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This file is part of Sortix.
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@ -14,13 +14,13 @@
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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descriptor_tables.cpp
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descriptor_tables.h
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Initializes and handles the GDT, TSS and IDT.
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******************************************************************************/
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*******************************************************************************/
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#ifndef SORTIX_DESCRIPTOR_TABLES_H
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#define SORTIX_DESCRIPTOR_TABLES_H
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@ -125,7 +125,6 @@ namespace Sortix
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namespace IDT
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{
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// A struct describing an interrupt gate.
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struct idt_entry32_struct
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{
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@ -168,59 +167,9 @@ namespace Sortix
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void Init();
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void SetGate(uint8_t num, addr_t base, uint16_t sel, uint8_t flags);
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void Flush();
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}
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}
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// These extern directives let us access the addresses of our ASM ISR handlers.
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extern "C" void isr0 ();
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extern "C" void isr1 ();
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extern "C" void isr2 ();
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extern "C" void isr3 ();
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extern "C" void isr4 ();
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extern "C" void isr5 ();
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extern "C" void isr6 ();
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extern "C" void isr7 ();
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extern "C" void isr8 ();
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extern "C" void isr9 ();
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extern "C" void isr10();
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extern "C" void isr11();
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extern "C" void isr12();
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extern "C" void isr13();
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extern "C" void isr14();
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extern "C" void isr15();
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extern "C" void isr16();
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extern "C" void isr17();
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extern "C" void isr18();
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extern "C" void isr19();
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extern "C" void isr20();
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extern "C" void isr21();
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extern "C" void isr22();
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extern "C" void isr23();
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extern "C" void isr24();
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extern "C" void isr25();
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extern "C" void isr26();
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extern "C" void isr27();
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extern "C" void isr28();
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extern "C" void isr29();
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extern "C" void isr30();
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extern "C" void isr31();
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extern "C" void isr128();
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extern "C" void irq0 ();
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extern "C" void irq1 ();
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extern "C" void irq2 ();
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extern "C" void irq3 ();
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extern "C" void irq4 ();
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extern "C" void irq5 ();
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extern "C" void irq6 ();
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extern "C" void irq7 ();
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extern "C" void irq8 ();
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extern "C" void irq9 ();
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extern "C" void irq10();
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extern "C" void irq11();
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extern "C" void irq12();
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extern "C" void irq13();
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extern "C" void irq14();
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extern "C" void irq15();
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#endif
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@ -1,6 +1,6 @@
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/******************************************************************************
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/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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This file is part of Sortix.
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@ -14,18 +14,17 @@
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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interrupt.cpp
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High level interrupt service routines and interrupt request handlers.
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******************************************************************************/
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*******************************************************************************/
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#include "platform.h"
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#include "log.h"
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#include "descriptor_tables.h"
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#include "interrupt.h"
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#include "panic.h"
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#include "process.h" // Hack for SIGSEGV
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#include "sound.h" // Hack for SIGSEGV
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@ -33,16 +32,16 @@
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#include "syscall.h" // HACK FOR SIGSEGV
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#include "scheduler.h" // HACK FOR SIGSEGV
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namespace Sortix
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{
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namespace Sortix {
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void SysExit(int status); // HACK
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namespace Interrupt
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{
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namespace Interrupt {
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const bool DEBUG_EXCEPTION = false;
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const bool DEBUG_IRQ = false;
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bool initialized;
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size_t numknownexceptions = 20;
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const size_t numknownexceptions = 20;
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const char* exceptions[] =
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{ "Divide by zero", "Debug", "Non maskable interrupt", "Breakpoint",
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"Into detected overflow", "Out of bounds", "Invalid opcode",
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@ -59,11 +58,76 @@ namespace Sortix
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void Init()
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{
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initialized = false;
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IDT::Init();
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for ( size_t i = 0; i < NUM_INTERRUPTS; i++ )
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{
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interrupthandlers[i] = NULL;
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interrupthandlerptr[i] = NULL;
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}
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RegisterRawHandler(0, isr0, false);
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RegisterRawHandler(1, isr1, false);
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RegisterRawHandler(2, isr2, false);
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RegisterRawHandler(3, isr3, false);
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RegisterRawHandler(4, isr4, false);
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RegisterRawHandler(5, isr5, false);
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RegisterRawHandler(6, isr6, false);
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RegisterRawHandler(7, isr7, false);
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RegisterRawHandler(8, isr8, false);
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RegisterRawHandler(9, isr9, false);
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RegisterRawHandler(10, isr10, false);
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RegisterRawHandler(11, isr11, false);
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RegisterRawHandler(12, isr12, false);
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RegisterRawHandler(13, isr13, false);
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RegisterRawHandler(14, isr14, false);
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RegisterRawHandler(15, isr15, false);
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RegisterRawHandler(16, isr16, false);
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RegisterRawHandler(17, isr17, false);
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RegisterRawHandler(18, isr18, false);
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RegisterRawHandler(19, isr19, false);
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RegisterRawHandler(20, isr20, false);
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RegisterRawHandler(21, isr21, false);
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RegisterRawHandler(22, isr22, false);
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RegisterRawHandler(23, isr23, false);
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RegisterRawHandler(24, isr24, false);
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RegisterRawHandler(25, isr25, false);
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RegisterRawHandler(26, isr26, false);
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RegisterRawHandler(27, isr27, false);
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RegisterRawHandler(28, isr28, false);
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RegisterRawHandler(29, isr29, false);
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RegisterRawHandler(30, isr30, false);
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RegisterRawHandler(31, isr31, false);
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RegisterRawHandler(32, irq0, false);
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RegisterRawHandler(33, irq1, false);
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RegisterRawHandler(34, irq2, false);
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RegisterRawHandler(35, irq3, false);
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RegisterRawHandler(36, irq4, false);
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RegisterRawHandler(37, irq5, false);
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RegisterRawHandler(38, irq6, false);
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RegisterRawHandler(39, irq7, false);
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RegisterRawHandler(40, irq8, false);
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RegisterRawHandler(41, irq9, false);
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RegisterRawHandler(42, irq10, false);
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RegisterRawHandler(43, irq11, false);
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RegisterRawHandler(44, irq12, false);
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RegisterRawHandler(45, irq13, false);
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RegisterRawHandler(46, irq14, false);
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RegisterRawHandler(47, irq15, false);
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for ( unsigned i = 48; i < 256; i++ )
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{
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RegisterRawHandler(48, interrupt_handler_null, false);
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}
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// TODO: Let the syscall.cpp code register this.
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RegisterRawHandler(128, syscall_handler, true);
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IDT::Flush();
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initialized = true;
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Interrupt::Enable();
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}
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void RegisterHandler(uint8_t n, Interrupt::Handler handler, void* user)
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@ -72,6 +136,17 @@ namespace Sortix
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interrupthandlerptr[n] = user;
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}
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// TODO: This function contains magic IDT-related values!
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void RegisterRawHandler(uint8_t index, RawHandler handler, bool userspace)
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{
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addr_t handlerentry = (addr_t) handler;
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uint16_t sel = 0x08;
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uint8_t flags = 0x8E;
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if ( userspace ) { flags |= 0x60; }
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IDT::SetGate(index, handlerentry, sel, flags);
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if ( initialized ) { IDT::Flush(); }
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}
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// This gets called from our ASM interrupt handler stub.
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extern "C" void ISRHandler(Sortix::CPU::InterruptRegisters* regs)
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{
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@ -150,5 +225,7 @@ namespace Sortix
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if ( 32 <= int_no && int_no < 48 ) { IRQHandler(regs); }
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else { ISRHandler(regs); }
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}
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}
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}
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} // namespace Interrupt
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} // namespace Sortix
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@ -1,6 +1,6 @@
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/******************************************************************************
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/*******************************************************************************
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|
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
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|
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@ -14,21 +14,20 @@
|
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||
details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along
|
||||
with Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
You should have received a copy of the GNU General Public License along with
|
||||
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
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interrupt.h
|
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High level interrupt service routines and interrupt request handlers.
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|
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******************************************************************************/
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*******************************************************************************/
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#ifndef SORTIX_ISR_H
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#define SORTIX_ISR_H
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#ifndef SORTIX_INTERRUPT_H
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#define SORTIX_INTERRUPT_H
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namespace Sortix {
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namespace Interrupt {
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namespace Sortix
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{
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namespace Interrupt
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{
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const unsigned IRQ0 = 32;
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const unsigned IRQ1 = 33;
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const unsigned IRQ2 = 34;
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@ -46,12 +45,70 @@ namespace Sortix
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const unsigned IRQ14 = 46;
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const unsigned IRQ15 = 47;
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typedef void (*Handler)(CPU::InterruptRegisters* regs, void* user);
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inline void Enable() { asm volatile("sti"); }
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inline void Disable() { asm volatile("cli"); }
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void RegisterHandler(uint8_t n, Handler handler, void* user);
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typedef void (*Handler)(CPU::InterruptRegisters* regs, void* user);
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void RegisterHandler(uint8_t index, Handler handler, void* user);
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typedef void (*RawHandler)(void);
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void RegisterRawHandler(uint8_t index, RawHandler handler, bool userspace);
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void Init();
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}
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}
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} // namespace Interrupt
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} // namespace Sortix
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extern "C" void isr0();
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extern "C" void isr1();
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extern "C" void isr2();
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extern "C" void isr3();
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extern "C" void isr4();
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extern "C" void isr5();
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extern "C" void isr6();
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extern "C" void isr7();
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extern "C" void isr8();
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extern "C" void isr9();
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extern "C" void isr10();
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extern "C" void isr11();
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extern "C" void isr12();
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extern "C" void isr13();
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extern "C" void isr14();
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extern "C" void isr15();
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extern "C" void isr16();
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extern "C" void isr17();
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extern "C" void isr18();
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extern "C" void isr19();
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extern "C" void isr20();
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extern "C" void isr21();
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extern "C" void isr22();
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extern "C" void isr23();
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extern "C" void isr24();
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extern "C" void isr25();
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extern "C" void isr26();
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extern "C" void isr27();
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extern "C" void isr28();
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extern "C" void isr29();
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extern "C" void isr30();
|
||||
extern "C" void isr31();
|
||||
extern "C" void isr128();
|
||||
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();
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -1,6 +1,6 @@
|
|||
/******************************************************************************
|
||||
/*******************************************************************************
|
||||
|
||||
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
|
||||
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
||||
|
|
@ -14,13 +14,14 @@
|
|||
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||
details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along
|
||||
with Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
You should have received a copy of the GNU General Public License along with
|
||||
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
kernel.cpp
|
||||
A common interface shared by all devices that can be printed text to.
|
||||
The main kernel initialization routine. Configures hardware and starts an
|
||||
initial process from the init ramdisk, allowing a full operating system.
|
||||
|
||||
******************************************************************************/
|
||||
*******************************************************************************/
|
||||
|
||||
#include "platform.h"
|
||||
#include <libmaxsi/memory.h>
|
||||
|
|
@ -205,7 +206,7 @@ namespace Sortix
|
|||
initrdsize = 0x280000; // 2 MiB 512 KiB
|
||||
#endif
|
||||
|
||||
Memory::RegisterInitRDSize(initrdsize);;
|
||||
Memory::RegisterInitRDSize(initrdsize);
|
||||
|
||||
// Initialize the paging and virtual memory.
|
||||
Memory::Init(BootInfo);
|
||||
|
|
@ -213,12 +214,9 @@ namespace Sortix
|
|||
// Initialize the GDT and TSS structures.
|
||||
GDT::Init();
|
||||
|
||||
// Initialize the interrupt handler table to zeroes.
|
||||
// Initialize the interrupt handler table and enable interrupts.
|
||||
Interrupt::Init();
|
||||
|
||||
// Initialize the interrupt descriptor tables (enabling interrupts).
|
||||
IDT::Init();
|
||||
|
||||
// Initialize the kernel heap.
|
||||
Maxsi::Memory::Init();
|
||||
|
||||
|
|
|
|||
|
|
@ -49,9 +49,6 @@ gdt_flush_postjmp:
|
|||
idt_flush:
|
||||
# Load the IDT pointer.
|
||||
lidt (%rdi)
|
||||
|
||||
# Enable interrupts
|
||||
sti
|
||||
ret
|
||||
|
||||
.global tss_flush
|
||||
|
|
|
|||
|
|
@ -438,3 +438,8 @@ interrupt_handler_prepare:
|
|||
# Return to where we came from.
|
||||
iretq
|
||||
|
||||
.global interrupt_handler_null
|
||||
.type interrupt_handler_null, @function
|
||||
interrupt_handler_null:
|
||||
iretq
|
||||
|
||||
|
|
|
|||
|
|
@ -25,7 +25,6 @@ gdt_flush:
|
|||
idt_flush:
|
||||
mov eax, [esp+4] ; Get the pointer to the IDT, passed as a parameter.
|
||||
lidt [eax] ; Load the IDT pointer.
|
||||
sti
|
||||
ret
|
||||
|
||||
[GLOBAL tss_flush] ; Allows our C code to call tss_flush().
|
||||
|
|
|
|||
|
|
@ -157,5 +157,9 @@ irq_common_stub:
|
|||
;sti
|
||||
iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
|
||||
|
||||
global
|
||||
|
||||
global interrupt_handler_null
|
||||
interrupt_handler_null:
|
||||
iret
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue