129 lines
3.1 KiB
D
129 lines
3.1 KiB
D
/**
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* IDT (Interrupt Descriptor Table) functionality.
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*/
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module hulk.idt;
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import hulk.gdt;
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import ldc.llvmasm;
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import hulk.fb;
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import hulk.console;
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import hulk.klog;
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import hulk.apic;
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import hulk.rtc;
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struct idt
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{
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/* IRQ 0 is interrupt 32 (0x20). */
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public static enum ulong INT_RTC = 0x28u; /* IRQ 8 */
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public static enum ulong INT_LAPIC_TIMER = 0x70u;
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public static enum ulong INT_LAPIC_LINT0 = 0x71u;
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public static enum ulong INT_LAPIC_LINT1 = 0x72u;
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struct idtr_t
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{
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ushort limit;
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align(2) ulong offset;
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}
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static assert(idtr_t.sizeof == 10u);
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alias descriptor_t = ulong[2];
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static __gshared align(0x10) descriptor_t[256] idt;
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static assert(idt.sizeof == (256u * 16u));
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static __gshared idtr_t idtr;
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public static void initialize()
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{
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set_isrs();
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idtr.limit = idt.sizeof - 1u;
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idtr.offset = cast(ulong)&idt;
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lidt(&idtr);
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}
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private static void lidt(idtr_t * idtr)
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{
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__asm("lidt $0", "*m", idtr);
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}
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private static bool isr_has_error_code(size_t isr)
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{
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return (isr == 8) ||
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((10 <= isr) && (isr <= 14)) ||
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(isr == 17) ||
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(isr == 21) ||
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(isr == 29) ||
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(isr == 30);
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}
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private static bool isr_is_trap(size_t isr)
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{
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return (isr < 32u) && (isr != 2u);
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}
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private static void set_isrs()
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{
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ulong isr_address;
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static foreach(isr; 0 .. 256)
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{
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mixin("isr_address = __asm!ulong(`
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movabs $$1f, %rax
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jmp 2f
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1:
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pushq %rdi
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pushq %rsi
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pushq %rax
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mov $$", isr, ", %rdi
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" ~ (isr_has_error_code(isr) ? "mov 0x18(%rsp), %rsi" : "") ~ "
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movabs $$isr, %rax
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callq *%rax
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popq %rax
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popq %rsi
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popq %rdi
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" ~ (isr_has_error_code(isr) ? "add $$8, %rsp" : "") ~ "
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iretq
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2:`, `={rax}`);");
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mixin("set_descriptor(", isr, ", 0u, " ~
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(isr_is_trap(isr) ? "true" : "false") ~ ", isr_address);");
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}
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}
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private static void set_descriptor(size_t index, ulong dpl, bool trap, ulong offset)
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{
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idt[index][0] =
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0x0000_8E_00_0000_0000u |
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((offset & 0xFFFF_0000u) << 32u) |
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(dpl << 45u) |
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((trap ? 1uL : 0uL) << 40u) |
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(gdt.SELECTOR_KERNEL_CODE << 16u) |
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(offset & 0xFFFFu);
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idt[index][1] = offset >> 32u;
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}
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}
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public extern(C) void isr(ulong vector, ulong arg)
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{
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switch (vector)
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{
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case idt.INT_RTC:
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rtc.isr();
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break;
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case idt.INT_LAPIC_TIMER:
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case idt.INT_LAPIC_LINT0:
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case idt.INT_LAPIC_LINT1:
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apic.isr(vector);
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break;
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default:
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console.clear();
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fb.clear(0xFF8000u);
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klog.writefln("ISR %u, 0x%x", vector, arg);
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__asm("cli", "");
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for (;;)
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{
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__asm("hlt", "");
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}
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}
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}
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