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Further cleanup and refactoring of the interrupt code.

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This commit is contained in:
Jonas 'Sortie' Termansen 2012-02-29 23:03:40 +01:00
parent 0e48b23429
commit 5162a12d03
4 changed files with 110 additions and 85 deletions
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19
sortix/descriptor_tables.cpp
View file

@ -36,7 +36,7 @@ namespace Sortix
{
extern "C" void gdt_flush(addr_t);
extern "C" void tss_flush();
const size_t GDT_NUM_ENTRIES = 7;
gdt_entry_t gdt_entries[GDT_NUM_ENTRIES];
gdt_ptr_t gdt_ptr;
@ -45,7 +45,7 @@ namespace Sortix
const uint8_t GRAN_64_BIT_MODE = 1<<5;
const uint8_t GRAN_32_BIT_MODE = 1<<6;
const uint8_t GRAN_4KIB_BLOCKS = 1<<7;
void Init()
{
gdt_ptr.limit = (sizeof(gdt_entry_t) * GDT_NUM_ENTRIES) - 1;
@ -159,8 +159,7 @@ namespace Sortix
namespace IDT
{
// Lets us access our ASM functions from our C++ code.
extern "C" void idt_flush(uint32_t);
extern "C" void idt_flush(addr_t);
idt_entry_t idt_entries[256];
idt_ptr_t idt_ptr;
@ -171,18 +170,6 @@ namespace Sortix
idt_ptr.base = (addr_t) &idt_entries;
Memory::Set(&idt_entries, 0, sizeof(idt_entry_t)*256);
// Remap the irq table.
CPU::OutPortB(0x20, 0x11);
CPU::OutPortB(0xA0, 0x11);
CPU::OutPortB(0x21, 0x20);
CPU::OutPortB(0xA1, 0x28);
CPU::OutPortB(0x21, 0x04);
CPU::OutPortB(0xA1, 0x02);
CPU::OutPortB(0x21, 0x01);
CPU::OutPortB(0xA1, 0x01);
CPU::OutPortB(0x21, 0x0);
CPU::OutPortB(0xA1, 0x0);
}
void Flush()

160
sortix/interrupt.cpp
View file

@ -37,21 +37,52 @@ void SysExit(int status); // HACK
namespace Interrupt {
const uint16_t PIC_MASTER = 0x20;
const uint16_t PIC_SLAVE = 0xA0;
const uint16_t PIC_COMMAND = 0x00;
const uint16_t PIC_DATA = 0x01;
const uint8_t PIC_CMD_ENDINTR = 0x20;
const uint8_t PIC_ICW1_ICW4 = 0x01; // ICW4 (not) needed
const uint8_t PIC_ICW1_SINGLE = 0x02; // Single (cascade) mode
const uint8_t PIC_ICW1_INTERVAL4 = 0x04; // Call address interval 4 (8)
const uint8_t PIC_ICW1_LEVEL = 0x08; // Level triggered (edge) mode
const uint8_t PIC_CMD_INIT = 0x10;
const uint8_t PIC_MODE_8086 = 0x01; // 8086/88 (MCS-80/85) mode
const uint8_t PIC_MODE_AUTO = 0x02; // Auto (normal) EOI
const uint8_t PIC_MODE_BUF_SLAVE = 0x08; // Buffered mode/slave
const uint8_t PIC_MODE_BUF_MASTER = 0x0C; // Buffered mode/master
const uint8_t PIC_MODE_SFNM = 0x10; // Special fully nested (not)
const bool DEBUG_EXCEPTION = false;
const bool DEBUG_IRQ = false;
bool initialized;
const size_t numknownexceptions = 20;
const size_t NUM_KNOWN_EXCEPTIONS = 20;
const char* exceptions[] =
{ "Divide by zero", "Debug", "Non maskable interrupt", "Breakpoint",
"Into detected overflow", "Out of bounds", "Invalid opcode",
"No coprocessor", "Double fault", "Coprocessor segment overrun",
"Bad TSS", "Segment not present", "Stack fault",
"General protection fault", "Page fault", "Unknown interrupt",
"Coprocessor fault", "Alignment check", "Machine check",
"SIMD Floating-Point" };
{
"Divide by zero",
"Debug",
"Non maskable interrupt",
"Breakpoint",
"Into detected overflow",
"Out of bounds",
"Invalid opcode",
"No coprocessor",
"Double fault",
"Coprocessor segment overrun",
"Bad TSS",
"Segment not present",
"Stack fault",
"General protection fault",
"Page fault",
"Unknown interrupt",
"Coprocessor fault",
"Alignment check",
"Machine check",
"SIMD Floating-Point",
};
const size_t NUM_INTERRUPTS = 256UL;
const unsigned NUM_INTERRUPTS = 256UL;
Handler interrupthandlers[NUM_INTERRUPTS];
void* interrupthandlerptr[NUM_INTERRUPTS];
@ -61,12 +92,27 @@ void Init()
initialized = false;
IDT::Init();
for ( size_t i = 0; i < NUM_INTERRUPTS; i++ )
for ( unsigned i = 0; i < NUM_INTERRUPTS; i++ )
{
interrupthandlers[i] = NULL;
interrupthandlerptr[i] = NULL;
RegisterRawHandler(i, interrupt_handler_null, false);
}
// Remap the IRQ table on the PICs.
uint8_t mastermask = 0;
uint8_t slavemask = 0;
CPU::OutPortB(PIC_MASTER + PIC_COMMAND, PIC_CMD_INIT | PIC_ICW1_ICW4);
CPU::OutPortB(PIC_SLAVE + PIC_COMMAND, PIC_CMD_INIT | PIC_ICW1_ICW4);
CPU::OutPortB(PIC_MASTER + PIC_DATA, IRQ0);
CPU::OutPortB(PIC_SLAVE + PIC_DATA, IRQ8);
CPU::OutPortB(PIC_MASTER + PIC_DATA, 0x04); // Slave PIC at IRQ2
CPU::OutPortB(PIC_SLAVE + PIC_DATA, 0x02); // Cascade Identity
CPU::OutPortB(PIC_MASTER + PIC_DATA, PIC_MODE_8086);
CPU::OutPortB(PIC_SLAVE + PIC_DATA, PIC_MODE_8086);
CPU::OutPortB(PIC_MASTER + PIC_DATA, mastermask);
CPU::OutPortB(PIC_SLAVE + PIC_DATA, slavemask);
RegisterRawHandler(0, isr0, false);
RegisterRawHandler(1, isr1, false);
RegisterRawHandler(2, isr2, false);
@ -116,11 +162,6 @@ void Init()
RegisterRawHandler(46, irq14, false);
RegisterRawHandler(47, irq15, false);
for ( unsigned i = 48; i < 256; i++ )
{
RegisterRawHandler(48, interrupt_handler_null, false);
}
// TODO: Let the syscall.cpp code register this.
RegisterRawHandler(128, syscall_handler, true);
@ -130,14 +171,14 @@ void Init()
Interrupt::Enable();
}
void RegisterHandler(uint8_t n, Interrupt::Handler handler, void* user)
void RegisterHandler(unsigned n, Interrupt::Handler handler, void* user)
{
interrupthandlers[n] = handler;
interrupthandlerptr[n] = user;
}
// TODO: This function contains magic IDT-related values!
void RegisterRawHandler(uint8_t index, RawHandler handler, bool userspace)
void RegisterRawHandler(unsigned index, RawHandler handler, bool userspace)
{
addr_t handlerentry = (addr_t) handler;
uint16_t sel = 0x08;
@ -147,39 +188,43 @@ void RegisterRawHandler(uint8_t index, RawHandler handler, bool userspace)
if ( initialized ) { IDT::Flush(); }
}
// This gets called from our ASM interrupt handler stub.
extern "C" void ISRHandler(Sortix::CPU::InterruptRegisters* regs)
void CrashHandler(CPU::InterruptRegisters* regs)
{
const char* message = ( regs->int_no < NUM_KNOWN_EXCEPTIONS )
? exceptions[regs->int_no] : "Unknown";
if ( DEBUG_EXCEPTION ) { regs->LogRegisters(); Log::Print("\n"); }
#ifdef PLATFORM_X64
addr_t ip = regs->rip;
#else
addr_t ip = regs->eip;
#endif
// Halt and catch fire if we are the kernel.
unsigned codemode = regs->cs & 0x3U;
if ( codemode == 0 )
{
PanicF("Unhandled CPU Exception id %zu '%s' at ip=0x%zx "
"(cr2=0x%p, err_code=0x%p)", regs->int_no, message,
ip, regs->cr2, regs->err_code);
}
Log::Print("The current program has crashed and was terminated:\n");
Log::PrintF("%s exception at ip=0x%zx (cr2=0x%p, err_code=0x%p)\n",
message, ip, regs->cr2, regs->err_code);
Sound::Mute();
CurrentProcess()->Exit(139);
Scheduler::ProcessTerminated(regs);
}
void ISRHandler(Sortix::CPU::InterruptRegisters* regs)
{
if ( regs->int_no < 32 )
{
const char* message = ( regs->int_no < numknownexceptions )
? exceptions[regs->int_no] : "Unknown";
if ( DEBUG_EXCEPTION ) { regs->LogRegisters(); Log::Print("\n"); }
#ifdef PLATFORM_X64
addr_t ip = regs->rip;
#else
addr_t ip = regs->eip;
#endif
// Halt and catch fire if we are the kernel.
if ( (regs->cs & (0x4-1)) == 0 )
{
PanicF("Unhandled CPU Exception id %zu '%s' at ip=0x%zx "
"(cr2=0x%p, err_code=0x%p)", regs->int_no, message,
ip, regs->cr2, regs->err_code);
}
Log::Print("The current program has crashed and was terminated:\n");
Log::PrintF("%s exception at ip=0x%zx (cr2=0x%p, err_code=0x%p)\n",
message, ip, regs->cr2, regs->err_code);
Sound::Mute();
CurrentProcess()->Exit(139);
Scheduler::ProcessTerminated(regs);
CrashHandler(regs);
return;
}
@ -190,10 +235,9 @@ extern "C" void ISRHandler(Sortix::CPU::InterruptRegisters* regs)
}
}
// This gets called from our ASM interrupt handler stub.
extern "C" void IRQHandler(Sortix::CPU::InterruptRegisters* regs)
void IRQHandler(Sortix::CPU::InterruptRegisters* regs)
{
// TODO! IRQ 7 and 15 might be spurious and might need to be ignored.
// TODO: IRQ 7 and 15 might be spurious and might need to be ignored.
// See http://wiki.osdev.org/PIC for details (section Spurious IRQs).
if ( regs->int_no == 32 + 7 || regs->int_no == 32 + 15 ) { return; }
@ -204,18 +248,16 @@ extern "C" void IRQHandler(Sortix::CPU::InterruptRegisters* regs)
Log::Print("\n");
}
unsigned int_no = regs->int_no;
// Send an EOI (end of interrupt) signal to the PICs.
if ( IRQ8 <= int_no ) { CPU::OutPortB(PIC_SLAVE, PIC_CMD_ENDINTR); }
CPU::OutPortB(PIC_MASTER, PIC_CMD_ENDINTR);
// Send reset signal to slave if this interrupt involved the slave.
if (regs->int_no >= 40) { CPU::OutPortB(0xA0, 0x20); }
// Send reset signal to master.
CPU::OutPortB(0x20, 0x20);
if ( interrupthandlers[regs->int_no] )
if ( interrupthandlers[int_no] )
{
void* user = interrupthandlerptr[regs->int_no];
interrupthandlers[regs->int_no](regs, user);
void* user = interrupthandlerptr[int_no];
interrupthandlers[int_no](regs, user);
}
}

6
sortix/interrupt.h
View file

@ -36,7 +36,7 @@ const unsigned IRQ4 = 36;
const unsigned IRQ5 = 37;
const unsigned IRQ6 = 38;
const unsigned IRQ7 = 39;
const unsigned IRQ8 = 30;
const unsigned IRQ8 = 40;
const unsigned IRQ9 = 41;
const unsigned IRQ10 = 42;
const unsigned IRQ11 = 43;
@ -49,10 +49,10 @@ inline void Enable() { asm volatile("sti"); }
inline void Disable() { asm volatile("cli"); }
typedef void (*Handler)(CPU::InterruptRegisters* regs, void* user);
void RegisterHandler(uint8_t index, Handler handler, void* user);
void RegisterHandler(unsigned index, Handler handler, void* user);
typedef void (*RawHandler)(void);
void RegisterRawHandler(uint8_t index, RawHandler handler, bool userspace);
void RegisterRawHandler(unsigned index, RawHandler handler, bool userspace);
void Init();

10
sortix/x86/interrupt.asm
View file

@ -85,8 +85,7 @@ IRQ 13, 45
IRQ 14, 46
IRQ 15, 47
; In isr.c
extern ISRHandler
extern interrupt_handler
; This is our common ISR stub. It saves the processor state, sets
; up for kernel mode segments, calls the C-level fault handler,
@ -107,7 +106,7 @@ isr_common_stub:
push esp
call ISRHandler
call interrupt_handler
add esp, 8
pop ebx ; reload the original data segment descriptor
@ -121,9 +120,6 @@ isr_common_stub:
;sti
iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
; In isr.c
extern IRQHandler
; This is our common IRQ stub. It saves the processor state, sets
; up for kernel mode segments, calls the C-level fault handler,
; and finally restores the stack frame.
@ -143,7 +139,7 @@ irq_common_stub:
push esp
call IRQHandler
call interrupt_handler
add esp, 8
pop ebx ; reload the original data segment descriptor