mirror of
https://github.com/RGBCube/serenity
synced 2025-07-24 21:47:43 +00:00
Kernel: Make separate kernel entry points for each PIC IRQ
Instead of having a common entry point and looking at the PIC ISR to figure out which IRQ we're servicing, just make a separate entryway for each IRQ that pushes the IRQ number and jumps to a common routine. This fixes a weird issue where incoming network packets would sometimes cause the mouse to stop working. I didn't track it down further than realizing we were sometimes EOI'ing the wrong IRQ.
This commit is contained in:
Andreas Kling
parent
12cc518d1e
commit
f01fd54d1b
4 changed files with 123 additions and 129 deletions
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@ -40,24 +40,36 @@ void gdt_free_entry(u16 entry)
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s_gdt_freelist->append(entry);
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}
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extern "C" void handle_irq();
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extern "C" void asm_irq_entry();
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extern "C" void handle_irq(RegisterDump);
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extern "C" void irq_common_asm_entry();
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#define GENERATE_IRQ_ASM_ENTRY(irq, isr_number) \
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extern "C" void irq_##irq##_asm_entry(); \
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asm(".globl irq_" #irq "_asm_entry\n" \
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"irq_" #irq "_asm_entry:\n" \
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" pushw $" #isr_number "\n" \
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" pushw $0\n" \
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" jmp irq_common_asm_entry\n");
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asm(
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".globl asm_irq_entry\n"
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"asm_irq_entry: \n"
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" pushl $0x0\n"
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".globl irq_common_asm_entry\n"
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"irq_common_asm_entry: \n"
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" pusha\n"
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" pushw %ds\n"
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" pushw %es\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" popw %ds\n"
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" popw %es\n"
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" pushl %ds\n"
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" pushl %es\n"
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" pushl %fs\n"
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" pushl %gs\n"
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" pushl %ss\n"
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" mov $0x10, %ax\n"
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" mov %ax, %ds\n"
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" mov %ax, %es\n"
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" cld\n"
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" call handle_irq\n"
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" popw %es\n"
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" popw %ds\n"
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" add $0x4, %esp\n" // "popl %ss"
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" popl %gs\n"
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" popl %fs\n"
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" popl %es\n"
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" popl %ds\n"
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" popa\n"
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" add $0x4, %esp\n"
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" iret\n");
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@ -69,26 +81,21 @@ asm(
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".globl " #title "_asm_entry\n" \
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"" #title "_asm_entry: \n" \
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" pusha\n" \
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" pushw %ds\n" \
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" pushw %es\n" \
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" pushw %fs\n" \
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" pushw %gs\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" popw %ds\n" \
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" popw %es\n" \
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" popw %fs\n" \
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" popw %gs\n" \
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" pushl %ds\n" \
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" pushl %es\n" \
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" pushl %fs\n" \
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" pushl %gs\n" \
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" pushl %ss\n" \
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" mov $0x10, %ax\n" \
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" mov %ax, %ds\n" \
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" mov %ax, %es\n" \
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" cld\n" \
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" call " #title "_handler\n" \
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" popw %gs\n" \
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" popw %gs\n" \
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" popw %fs\n" \
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" popw %es\n" \
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" popw %ds\n" \
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" add $0x4, %esp \n" \
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" popl %gs\n" \
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" popl %fs\n" \
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" popl %es\n" \
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" popl %ds\n" \
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" popa\n" \
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" add $0x4, %esp\n" \
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" iret\n");
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@ -101,26 +108,21 @@ asm(
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"" #title "_asm_entry: \n" \
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" pushl $0x0\n" \
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" pusha\n" \
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" pushw %ds\n" \
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" pushw %es\n" \
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" pushw %fs\n" \
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" pushw %gs\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" pushw %ss\n" \
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" popw %ds\n" \
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" popw %es\n" \
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" popw %fs\n" \
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" popw %gs\n" \
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" pushl %ds\n" \
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" pushl %es\n" \
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" pushl %fs\n" \
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" pushl %gs\n" \
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" pushl %ss\n" \
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" mov $0x10, %ax\n" \
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" mov %ax, %ds\n" \
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" mov %ax, %es\n" \
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" cld\n" \
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" call " #title "_handler\n" \
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" popw %gs\n" \
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" popw %gs\n" \
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" popw %fs\n" \
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" popw %es\n" \
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" popw %ds\n" \
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" add $0x4, %esp\n" \
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" popl %gs\n" \
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" popl %fs\n" \
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" popl %es\n" \
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" popl %ds\n" \
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" popa\n" \
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" add $0x4, %esp\n" \
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" iret\n");
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@ -137,11 +139,10 @@ static void dump(const RegisterDump& regs)
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esp = regs.esp_if_crossRing;
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}
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kprintf("exception code: %04x\n", regs.exception_code);
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kprintf(" pc=%04x:%08x ds=%04x es=%04x fs=%04x gs=%04x\n", regs.cs, regs.eip, regs.ds, regs.es, regs.fs, regs.gs);
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kprintf("exception code: %04x (isr: %04x)\n", regs.exception_code, regs.isr_number);
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kprintf(" pc=%04x:%08x flags=%04x\n", regs.cs, regs.eip, regs.eflags);
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kprintf(" stk=%04x:%08x\n", ss, esp);
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if (current)
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kprintf("kstk=%04x:%08x, base=%08x\n", current->tss().ss0, current->tss().esp0, current->kernel_stack_base());
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kprintf(" ds=%04x es=%04x fs=%04x gs=%04x\n", regs.ds, regs.es, regs.fs, regs.gs);
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kprintf("eax=%08x ebx=%08x ecx=%08x edx=%08x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
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kprintf("ebp=%08x esp=%08x esi=%08x edi=%08x\n", regs.ebp, esp, regs.esi, regs.edi);
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@ -409,7 +410,6 @@ void register_irq_handler(u8 irq, IRQHandler& handler)
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{
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ASSERT(!s_irq_handler[irq]);
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s_irq_handler[irq] = &handler;
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register_interrupt_handler(IRQ_VECTOR_BASE + irq, asm_irq_entry);
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}
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void unregister_irq_handler(u8 irq, IRQHandler& handler)
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@ -437,17 +437,22 @@ void flush_idt()
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asm("lidt %0" ::"m"(s_idtr));
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}
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extern "C" void irq7_handler();
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asm(
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".globl irq7_handler\n"
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"irq7_handler:\n"
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" iret\n");
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extern "C" void irq15_handler();
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asm(
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".globl irq15_handler\n"
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"irq15_handler:\n"
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" iret\n");
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GENERATE_IRQ_ASM_ENTRY(0, 0x50)
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GENERATE_IRQ_ASM_ENTRY(1, 0x51)
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GENERATE_IRQ_ASM_ENTRY(2, 0x52)
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GENERATE_IRQ_ASM_ENTRY(3, 0x53)
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GENERATE_IRQ_ASM_ENTRY(4, 0x54)
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GENERATE_IRQ_ASM_ENTRY(5, 0x55)
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GENERATE_IRQ_ASM_ENTRY(6, 0x56)
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GENERATE_IRQ_ASM_ENTRY(7, 0x57)
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GENERATE_IRQ_ASM_ENTRY(8, 0x58)
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GENERATE_IRQ_ASM_ENTRY(9, 0x59)
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GENERATE_IRQ_ASM_ENTRY(10, 0x5a)
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GENERATE_IRQ_ASM_ENTRY(11, 0x5b)
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GENERATE_IRQ_ASM_ENTRY(12, 0x5c)
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GENERATE_IRQ_ASM_ENTRY(13, 0x5d)
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GENERATE_IRQ_ASM_ENTRY(14, 0x5e)
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GENERATE_IRQ_ASM_ENTRY(15, 0x5f)
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void idt_init()
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{
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@ -475,8 +480,22 @@ void idt_init()
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register_interrupt_handler(0x0f, _exception15);
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register_interrupt_handler(0x10, _exception16);
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register_interrupt_handler(0x57, irq7_handler);
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register_interrupt_handler(0x5f, irq15_handler);
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register_interrupt_handler(0x50, irq_0_asm_entry);
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register_interrupt_handler(0x51, irq_1_asm_entry);
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register_interrupt_handler(0x52, irq_2_asm_entry);
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register_interrupt_handler(0x53, irq_3_asm_entry);
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register_interrupt_handler(0x54, irq_4_asm_entry);
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register_interrupt_handler(0x55, irq_5_asm_entry);
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register_interrupt_handler(0x56, irq_6_asm_entry);
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register_interrupt_handler(0x57, irq_7_asm_entry);
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register_interrupt_handler(0x58, irq_8_asm_entry);
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register_interrupt_handler(0x59, irq_9_asm_entry);
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register_interrupt_handler(0x5a, irq_10_asm_entry);
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register_interrupt_handler(0x5b, irq_11_asm_entry);
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register_interrupt_handler(0x5c, irq_12_asm_entry);
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register_interrupt_handler(0x5d, irq_13_asm_entry);
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register_interrupt_handler(0x5e, irq_14_asm_entry);
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register_interrupt_handler(0x5f, irq_15_asm_entry);
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for (u8 i = 0; i < 16; ++i) {
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s_irq_handler[i] = nullptr;
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@ -490,24 +509,10 @@ void load_task_register(u16 selector)
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asm("ltr %0" ::"r"(selector));
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}
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void handle_irq()
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void handle_irq(RegisterDump regs)
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{
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u16 isr = PIC::get_isr();
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if (!isr) {
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kprintf("Spurious IRQ\n");
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return;
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}
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u8 irq = 0;
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for (u8 i = 0; i < 16; ++i) {
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if (i == 2)
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continue;
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if (isr & (1 << i)) {
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irq = i;
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break;
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}
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}
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ASSERT(regs.isr_number >= 0x50 && regs.isr_number <= 0x5f);
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u8 irq = (u8)(regs.isr_number - 0x50);
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if (s_irq_handler[irq])
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s_irq_handler[irq]->handle_irq();
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PIC::eoi(irq);
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@ -376,11 +376,11 @@ private:
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struct [[gnu::packed]] RegisterDump
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{
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u16 ss;
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u16 gs;
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u16 fs;
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u16 es;
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u16 ds;
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u32 ss;
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u32 gs;
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u32 fs;
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u32 es;
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u32 ds;
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u32 edi;
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u32 esi;
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u32 ebp;
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@ -390,13 +390,12 @@ struct [[gnu::packed]] RegisterDump
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u32 ecx;
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u32 eax;
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u16 exception_code;
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u16 __exception_code_padding;
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u16 isr_number;
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u32 eip;
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u16 cs;
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u16 __csPadding;
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u32 cs;
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u32 eflags;
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u32 esp_if_crossRing;
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u16 ss_if_crossRing;
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u32 ss_if_crossRing;
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};
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struct [[gnu::aligned(16)]] FPUState
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@ -14,26 +14,21 @@ asm(
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"timer_interrupt_entry: \n"
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" pushl $0x0\n"
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" pusha\n"
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" pushw %ds\n"
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" pushw %es\n"
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" pushw %fs\n"
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" pushw %gs\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" popw %ds\n"
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" popw %es\n"
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" popw %fs\n"
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" popw %gs\n"
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" pushl %ds\n"
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" pushl %es\n"
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" pushl %fs\n"
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" pushl %gs\n"
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" pushl %ss\n"
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" mov $0x10, %ax\n"
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" mov %ax, %ds\n"
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" mov %ax, %es\n"
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" cld\n"
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" call timer_interrupt_handler\n"
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" popw %gs\n"
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" popw %gs\n"
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" popw %fs\n"
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" popw %es\n"
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" popw %ds\n"
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" add $0x4, %esp\n"
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" popl %gs\n"
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" popl %fs\n"
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" popl %es\n"
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" popl %ds\n"
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" popa\n"
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" add $0x4, %esp\n"
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" iret\n");
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@ -12,26 +12,21 @@ asm(
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"syscall_asm_entry:\n"
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" pushl $0x0\n"
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" pusha\n"
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" pushw %ds\n"
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" pushw %es\n"
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" pushw %fs\n"
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" pushw %gs\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" popw %ds\n"
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" popw %es\n"
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" popw %fs\n"
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" popw %gs\n"
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" pushl %ds\n"
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" pushl %es\n"
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" pushl %fs\n"
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" pushl %gs\n"
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" pushl %ss\n"
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" mov $0x10, %ax\n"
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" mov %ax, %ds\n"
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" mov %ax, %es\n"
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" cld\n"
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" call syscall_handler\n"
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" popw %gs\n"
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" popw %gs\n"
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" popw %fs\n"
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" popw %es\n"
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" popw %ds\n"
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" add $0x4, %esp\n"
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" popl %gs\n"
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" popl %fs\n"
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" popl %es\n"
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" popl %ds\n"
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" popa\n"
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" add $0x4, %esp\n"
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" iret\n");
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