mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 14:02:19 +00:00
199 lines
9.9 KiB
C#
199 lines
9.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace Indy.IL2CPU.Assembler.X86 {
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public class Assembler : Indy.IL2CPU.Assembler.Assembler {
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public const string BreakMethodName = "DebugStub_Break";
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protected byte mComNumber = 0;
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protected UInt16[] mComPortAddresses = { 0x3F8, 0x2F8, 0x3E8, 0x2E8 };
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public Assembler(Func<string, string> aGetStreamForGroup, bool aInMetalMode, byte aComNumber)
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: base(aGetStreamForGroup, aInMetalMode) {
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mComNumber = aComNumber;
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}
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public Assembler(Func<string, string> aGetStreamForGroup) : base(aGetStreamForGroup) {
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}
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private static string GetValidGroupName(string aGroup) {
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return aGroup.Replace('-','_').Replace('.', '_');
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}
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protected override void EmitCodeSectionHeader(string aGroup, TextWriter aOutputWriter) {
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base.EmitCodeSectionHeader(aGroup, aOutputWriter);
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using (var xAsm = new RawAssembler()) {
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aOutputWriter.WriteLine("section .text");
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("global Kernel_Start");
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aOutputWriter.WriteLine("Kernel_Start: ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("; MultiBoot-compliant loader (e.g. GRUB or X.exe) provides info in registers: ");
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aOutputWriter.WriteLine("; EBX=multiboot_info ");
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aOutputWriter.WriteLine("; EAX=0x2BADB002 - check if it's really Multiboot loader ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(" ;- copy mb info - some stuff for you ");
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//aOutputWriter.WriteLine(" mov mb_info, ebx");
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aOutputWriter.WriteLine(" add ebx, 4");
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aOutputWriter.WriteLine(" mov dword eax, [ebx]");
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aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_Low], eax");
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aOutputWriter.WriteLine(" add ebx, 4");
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aOutputWriter.WriteLine(" mov dword eax, [ebx]");
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aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_High], eax");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(" mov esp,Kernel_Stack ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("; some more startups todo");
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aOutputWriter.WriteLine(" cli");
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//aOutputWriter.WriteLine(" push ebx");
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if (mComNumber > 0) {
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UInt16 xComAddr = mComPortAddresses[mComNumber - 1];
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x00");
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aOutputWriter.WriteLine("out DX, AL"); // disable all interrupts
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x80");
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aOutputWriter.WriteLine("out DX, AL"); // Enable DLAB (set baud rate divisor)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 0).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x01");
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aOutputWriter.WriteLine("out DX, AL"); // Set divisor (lo byte)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x00");
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aOutputWriter.WriteLine("out DX, AL"); // (hi byte)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x03");
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aOutputWriter.WriteLine("out DX, AL"); // 8 bits, no parity, one stop bit
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 2).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0xC7");
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aOutputWriter.WriteLine("out DX, AL"); // Enable FIFO, clear them, with 14-byte threshold
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 4).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x03");
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aOutputWriter.WriteLine("out DX, AL"); // IRQ-s enabled, RTS/DSR set
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}
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// SSE init
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// CR4[bit 9]=1, CR4[bit 10]=1, CR0[bit 2]=0, CR0[bit 1]=1
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aOutputWriter.WriteLine("mov eax, cr4");
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aOutputWriter.WriteLine("or eax, 0x100");
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aOutputWriter.WriteLine("mov cr4, eax");
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aOutputWriter.WriteLine("mov eax, cr4");
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aOutputWriter.WriteLine("or eax, 0x200");
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aOutputWriter.WriteLine("mov cr4, eax");
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aOutputWriter.WriteLine("mov eax, cr0");
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aOutputWriter.WriteLine("and eax, 0xfffffffd");
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aOutputWriter.WriteLine("mov cr0, eax");
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aOutputWriter.WriteLine("mov eax, cr0");
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aOutputWriter.WriteLine("or eax, 0x1");
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aOutputWriter.WriteLine("mov cr0, eax");
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// END SSE INIT
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aOutputWriter.WriteLine(" call " + EntryPointName);
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aOutputWriter.WriteLine(" .loop:");
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aOutputWriter.WriteLine(" cli");
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aOutputWriter.WriteLine(" hlt");
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aOutputWriter.WriteLine(" jmp .loop");
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aOutputWriter.WriteLine(" ");
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if (mComNumber > 0) {
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var xStub = new DebugStub();
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xStub.Main(mComPortAddresses[mComNumber - 1]);
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}
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}
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aOutputWriter.WriteLine(xAsm.GetContents());
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}
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}
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protected override void EmitDataSectionHeader(string aGroup, TextWriter aOutputWriter) {
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base.EmitDataSectionHeader(aGroup, aOutputWriter);
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("section .data");
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aOutputWriter.WriteLine("_start: ");
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aOutputWriter.WriteLine("; multiboot header ");
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aOutputWriter.WriteLine("MBFLAGS equ 0x03 ; 4KB aligned modules etc., full memory info, ");
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aOutputWriter.WriteLine(" ; use special header (see below) ");
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aOutputWriter.WriteLine("dd 0x1BADB002 ; multiboot signature ");
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aOutputWriter.WriteLine("dd MBFLAGS ; 4kb page aligment for modules, supply memory info ");
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aOutputWriter.WriteLine("dd -0x1BADB002-MBFLAGS ; checksum=-(FLAGS+0x1BADB002) ");
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aOutputWriter.WriteLine("; other data - that is the additional (optional) header which helps to load ");
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aOutputWriter.WriteLine("; the kernel. ");
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//aOutputWriter.WriteLine(" dd _start ; header_addr ");
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//aOutputWriter.WriteLine(" dd _start ; load_addr ");
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//aOutputWriter.WriteLine(" dd _end_data ; load_end_addr ");
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//aOutputWriter.WriteLine(" dd _end ; bss_end_addr ");
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//aOutputWriter.WriteLine(" dd Kernel_Start ; entry ");
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aOutputWriter.WriteLine("; end of header ");
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//aOutputWriter.WriteLine("mb_info multiboot_info");
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aOutputWriter.WriteLine("MultiBootInfo_Memory_High dd 0");
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aOutputWriter.WriteLine("MultiBootInfo_Memory_Low dd 0");
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if (Signature != null && Signature.Length > 0) {
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aOutputWriter.WriteLine("{0} db {1}", SignatureLabelName, Signature.Aggregate<byte, string>("", (r, b) => r + b + ",") + "0");
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}
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aOutputWriter.WriteLine("DebugTraceMode dd 1"); // Tracing: On, Off
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aOutputWriter.WriteLine("DebugStatus dd 0"); // Run, Break, Stepping
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aOutputWriter.WriteLine("DebugRunning dd 0"); // 0 = Not in, 1 = already running
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aOutputWriter.WriteLine("DebugSuspendLevel dd 0"); // Nesting control for non steppable routines
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aOutputWriter.WriteLine("DebugResumeLevel dd 0"); // Nesting control for non steppable routines
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aOutputWriter.WriteLine("DebugEIP dd 0"); // Last EIP value
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aOutputWriter.WriteLine("InterruptsEnabledFlag dd 0");
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aOutputWriter.WriteLine("DebugTraceSent dd 0");
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}
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}
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protected override void EmitIDataSectionHeader(string aGroup, TextWriter aOutputWriter) {
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}
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protected override void EmitDataSectionFooter(string aGroup, TextWriter aOutputWriter) {
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base.EmitDataSectionFooter(aGroup, aOutputWriter);
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(";--- bss --- place r*, d* ? directives here, so that you'll have a BSS. ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("Before_Kernel_Stack:");
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//aOutputWriter.WriteLine("times 50000 resb 0 ; our own stack ");
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aOutputWriter.WriteLine("TIMES 0x50000 db 0");
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aOutputWriter.WriteLine("Kernel_Stack: ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("_end: ; end of BSS - here's the virtual and logical end.");
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}
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}
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protected override void EmitHeader(string aGroup, TextWriter aOutputWriter) {
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//mOutputWriter.WriteLine("format ms coff ");
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//mOutputWriter.WriteLine("org 0220000h ; the best place to load our kernel to. ");
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aOutputWriter.WriteLine("use32 ; the kernel will be run in 32-bit protected mode, ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("%ifdef {0}", GetValidGroupName(aGroup));
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aOutputWriter.WriteLine("%else");
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aOutputWriter.WriteLine(" %define {0} 1", GetValidGroupName(aGroup));
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aOutputWriter.WriteLine("");
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}
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protected override void EmitIncludes(string aGroup, TextWriter aOutputWriter) {
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foreach (string xInclude in (from item in Includes
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where String.Equals(item.Key, aGroup, StringComparison.InvariantCultureIgnoreCase)
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select item.Value).Distinct(StringComparer.InvariantCultureIgnoreCase)) {
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aOutputWriter.WriteLine("%include '{0}'", xInclude);
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}
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}
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protected override void EmitFooter(string aGroup, TextWriter aOutputWriter) {
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("_end_data: ; -- end of CODE+DATA ");
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}
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aOutputWriter.WriteLine("%endif");
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}
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}
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}
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