171 lines
5.2 KiB
Nim
171 lines
5.2 KiB
Nim
import macros, serial
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type
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IDTEntry{.packed.} = object
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base_low: uint16
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kernel_selector: uint16
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zero: uint8
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flags: uint8
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base_high: uint16
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IDTPointer{.packed.} = object
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limit: uint16
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base: uint32
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IDT{.packed.} = object
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descriptor: IDTPointer
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entries: array[0..255, IDTEntry]
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Registers{.packed.} = object
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ds: uint32 # Data segment selector
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edi, esi, ebp, esp, ebx, edx, ecx, eax: uint32 # Pushed by pusha.
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int_no, err_code: uint32 # Interrupt number and error code (if applicable)
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eip, cs, eflags, useresp, ss: uint32 # Pushed by the processor automatically.
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var
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idt: IDT
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idtAddr: uint32 = cast[uint32](idt.addr)
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{.push stackTrace:off.}
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proc idtFlush(){.inline,asmNoStackFrame.} =
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asm """
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lidt [`idtAddr`]
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ret
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"""
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{.pop.}
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proc isrHandler(registers: Registers){.exportc.} =
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serial.write("Recieved interrupt:")
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serial.write(registers.int_no)
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serial.write("\L")
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proc isrCommon() =
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asm """
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pusha
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movw %ax, %ds
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push %eax
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movw $0x10, %ax
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movw %ds, %ax
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movw %es, %ax
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movw %fs, %ax
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movw %gs, %ax
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call `isrHandler`
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pop %eax
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movw %ds, %ax
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movw %es, %ax
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movw %fs, %ax
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movw %gs, %ax
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popa
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add $8, %esp
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sti
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iret
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"""
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macro generateISR(code: static[uint8], isError: static[bool]): typed =
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result = nnkStmtList.newTree(
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nnkProcDef.newTree(
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newIdentNode("isr" & $code),
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newEmptyNode(),
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newEmptyNode(),
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nnkFormalParams.newTree(
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newEmptyNode()
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),
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newEmptyNode(),
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newEmptyNode(),
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nnkStmtList.newTree(
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nnkAsmStmt.newTree(
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newEmptyNode(),
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newLit("cli\x0A" & (if isError: "" else: "push 0\x0A") & "push " & $code & "\x0A")
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),
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nnkCall.newTree(
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newIdentNode("isrCommon")
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)
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)
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)
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)
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proc idtSetGate(num: uint8, base: uint32, sel: uint16, flags: uint8) =
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idt.entries[num].base_low = uint16(base and 0xFFFF)
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idt.entries[num].base_high = uint16((base shr 16) and 0xFFFF)
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idt.entries[num].zero = 0
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idt.entries[num].flags = flags
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idt.entries[num].kernel_selector = sel
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# Would like to generate these in a loop, but apparently
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# Error: type mismatch: got <uint8, bool>
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# but expected one of:
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# macro generateISR(code: static[uint8]; isError: static[bool]): typed
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# first type mismatch at position: 1
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# required type: static[uint8]
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# but expression 'uint8(i)' is of type: uint8
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static:
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generateISR(0, false)
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generateISR(1, false)
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generateISR(2, false)
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generateISR(3, false)
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generateISR(4, false)
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generateISR(5, false)
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generateISR(6, false)
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generateISR(7, false)
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generateISR(8, true)
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generateISR(9, false)
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generateISR(10, true)
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generateISR(11, true)
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generateISR(12, true)
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generateISR(13, true)
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generateISR(14, true)
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generateISR(15, false)
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generateISR(16, false)
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generateISR(17, false)
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generateISR(18, false)
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generateISR(19, false)
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generateISR(20, false)
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generateISR(21, false)
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generateISR(22, false)
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generateISR(23, false)
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generateISR(24, false)
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generateISR(25, false)
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generateISR(26, false)
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generateISR(27, false)
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generateISR(28, false)
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generateISR(29, false)
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generateISR(30, false)
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generateISR(31, false)
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let
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selector: uint16 = 0x08
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flags: uint8 = 0x8E
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proc idtInstall*() =
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idt.descriptor.limit = uint16(sizeof(IDTEntry) * idt.entries.len) - 1
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idt.descriptor.base = cast[uint32](idt.entries.addr)
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idtSetGate(0, cast[uint32](isr0) ,selector, flags)
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idtSetGate(1, cast[uint32](isr1) ,selector, flags)
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idtSetGate(2, cast[uint32](isr2) ,selector, flags)
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idtSetGate(3, cast[uint32](isr3) ,selector, flags)
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idtSetGate(4, cast[uint32](isr4) ,selector, flags)
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idtSetGate(5, cast[uint32](isr5) ,selector, flags)
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idtSetGate(6, cast[uint32](isr6) ,selector, flags)
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idtSetGate(7, cast[uint32](isr7) ,selector, flags)
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idtSetGate(8, cast[uint32](isr8) ,selector, flags)
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idtSetGate(9, cast[uint32](isr9) ,selector, flags)
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idtSetGate(10, cast[uint32](isr10) ,selector, flags)
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idtSetGate(11, cast[uint32](isr11) ,selector, flags)
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idtSetGate(12, cast[uint32](isr12) ,selector, flags)
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idtSetGate(13, cast[uint32](isr13) ,selector, flags)
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idtSetGate(14, cast[uint32](isr14) ,selector, flags)
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idtSetGate(15, cast[uint32](isr15) ,selector, flags)
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idtSetGate(16, cast[uint32](isr16) ,selector, flags)
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idtSetGate(17, cast[uint32](isr17) ,selector, flags)
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idtSetGate(18, cast[uint32](isr18) ,selector, flags)
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idtSetGate(19, cast[uint32](isr19) ,selector, flags)
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idtSetGate(20, cast[uint32](isr20) ,selector, flags)
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idtSetGate(21, cast[uint32](isr21) ,selector, flags)
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idtSetGate(22, cast[uint32](isr22) ,selector, flags)
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idtSetGate(23, cast[uint32](isr23) ,selector, flags)
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idtSetGate(24, cast[uint32](isr24) ,selector, flags)
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idtSetGate(25, cast[uint32](isr25) ,selector, flags)
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idtSetGate(26, cast[uint32](isr26) ,selector, flags)
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idtSetGate(27, cast[uint32](isr27) ,selector, flags)
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idtSetGate(28, cast[uint32](isr28) ,selector, flags)
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idtSetGate(29, cast[uint32](isr29) ,selector, flags)
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idtSetGate(30, cast[uint32](isr30) ,selector, flags)
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idtSetGate(31, cast[uint32](isr31) ,selector, flags)
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idtFlush() |