From 77e4e91b73b798e8b90c2cb7b3719d1b8a804c47 Mon Sep 17 00:00:00 2001
From: Nathan Cannon <neviynhd@gmail.com>
Date: Sat, 21 Oct 2017 19:23:17 +0100
Subject: [PATCH] Moved from a flat directory structure to a more sane one.

---
 boot.s => kernel/arch/i386/boot.s             |  0
 linker.ld => kernel/arch/i386/linker.ld       |  0
 kernel.nim => kernel/arch/i386/tty.nim        | 36 +++----------------
 kernel/arch/i386/vga.nim                      | 24 +++++++++++++
 kernel/kernel.nim                             |  5 +++
 panicoverride.nim => kernel/panicoverride.nim |  0
 makefile                                      |  6 ++--
 nim.cfg                                       |  7 ++--
 8 files changed, 40 insertions(+), 38 deletions(-)
 rename boot.s => kernel/arch/i386/boot.s (100%)
 rename linker.ld => kernel/arch/i386/linker.ld (100%)
 rename kernel.nim => kernel/arch/i386/tty.nim (57%)
 create mode 100644 kernel/arch/i386/vga.nim
 create mode 100644 kernel/kernel.nim
 rename panicoverride.nim => kernel/panicoverride.nim (100%)

diff --git a/boot.s b/kernel/arch/i386/boot.s
similarity index 100%
rename from boot.s
rename to kernel/arch/i386/boot.s
diff --git a/linker.ld b/kernel/arch/i386/linker.ld
similarity index 100%
rename from linker.ld
rename to kernel/arch/i386/linker.ld
diff --git a/kernel.nim b/kernel/arch/i386/tty.nim
similarity index 57%
rename from kernel.nim
rename to kernel/arch/i386/tty.nim
index 83684c3..c70dc8c 100644
--- a/kernel.nim
+++ b/kernel/arch/i386/tty.nim
@@ -1,27 +1,4 @@
-type
-  VGA_Colour {.pure.} = enum
-    black = 0,
-    blue = 1,
-    green = 2,
-    cyan = 3,
-    red = 4,
-    magenta = 5,
-    brown = 6,
-    lightGrey = 7,
-    darkGrey = 8,
-    lightBlue = 9,
-    lightGreen = 10,
-    lightCyan = 11,
-    lightRed = 12,
-    lightMagenta = 13,
-    lightBrown = 14,
-    white = 15
-
-proc vgaEntryColour(fg: VGA_Colour, bg: VGA_Colour): int =
-  result = ord(fg) or (ord(bg) shl 4)
-
-proc vgaEntry(c: char, colour: int): int16 =
-  result = int16(int(c) or (colour shl 8))
+import vga
 
 const
   vgaWidth = 80
@@ -35,9 +12,9 @@ var
 
 proc terminalWriteAtPoint(writeChar: char, colour: int, xPos: int, yPos: int) =
   let index = terminalBufferBaseAddress + (yPos * bufferWidthSkip + (xPos * 2))
-  cast[ptr int16](index)[] = vgaEntry(writeChar, terminalColour) # Write directly to display memory
+  cast[ptr int16](index)[] = vga.vgaEntry(writeChar, terminalColour) # Write directly to display memory
 
-proc terminalInitialize() =
+proc terminalInitialize*() =
   terminalColour = vgaEntryColour(VGA_Colour.lightGreen, VGA_Colour.red)
   for x in 0..<vgaWidth:
     for y in 0..<vgaHeight:
@@ -59,11 +36,6 @@ proc terminalWriteChar(writeChar: char) =
     inc(terminalRow)
     if(terminalRow == vgaHeight): terminalRow = 0
 
-proc terminalWrite(data: string) =
+proc terminalWrite*(data: string) =
   for character in data:
     terminalWriteChar(character)
-
-proc kernelMain() {.exportc: "kernel_main"}=
-  terminalInitialize()
-  terminalWrite("Hello World!\LNim here!")
-
diff --git a/kernel/arch/i386/vga.nim b/kernel/arch/i386/vga.nim
new file mode 100644
index 0000000..3e062ab
--- /dev/null
+++ b/kernel/arch/i386/vga.nim
@@ -0,0 +1,24 @@
+type
+  VGA_Colour* {.pure.} = enum
+    black = 0,
+    blue = 1,
+    green = 2,
+    cyan = 3,
+    red = 4,
+    magenta = 5,
+    brown = 6,
+    lightGrey = 7,
+    darkGrey = 8,
+    lightBlue = 9,
+    lightGreen = 10,
+    lightCyan = 11,
+    lightRed = 12,
+    lightMagenta = 13,
+    lightBrown = 14,
+    white = 15
+
+proc vgaEntryColour*(fg: VGA_Colour, bg: VGA_Colour): int =
+  result = ord(fg) or (ord(bg) shl 4)
+
+proc vgaEntry*(c: char, colour: int): int16 =
+  result = int16(int(c) or (colour shl 8))
diff --git a/kernel/kernel.nim b/kernel/kernel.nim
new file mode 100644
index 0000000..f444e0c
--- /dev/null
+++ b/kernel/kernel.nim
@@ -0,0 +1,5 @@
+import tty
+
+proc kernelMain() {.exportc: "kernel_main"}=
+  terminalInitialize()
+  terminalWrite("Hello World!\LNim here!")
diff --git a/panicoverride.nim b/kernel/panicoverride.nim
similarity index 100%
rename from panicoverride.nim
rename to kernel/panicoverride.nim
diff --git a/makefile b/makefile
index 7e25ab5..b71efe9 100644
--- a/makefile
+++ b/makefile
@@ -1,10 +1,10 @@
 all: kernel
 
 kernel: bootloader
-	nim cc kernel.nim
+	nim cc --skipCfg kernel/kernel.nim
 
 bootloader:
-	nasm -felf32 boot.s -o boot.o
+	nasm -felf32 kernel/arch/i386/boot.s -o boot.o
 
 clean:
-	rm -r kernel nimcache/ boot.o
+	rm -r myos.bin nimcache/ boot.o
diff --git a/nim.cfg b/nim.cfg
index 8c2279a..96c1d79 100644
--- a/nim.cfg
+++ b/nim.cfg
@@ -1,9 +1,10 @@
 --cc:clang
---clang.linkerexe=clang
+--clang.linkerexe="clang"
 --gc:none
 --deadCodeElim:on
+--path:"kernel/arch/i386"
 --cpu:i386
 --os:standalone
 --passC:"-ffreestanding -nostdlib --target=i686-pc-none-elf -march=i686"
---passL:"-target i386 -nostdlib -T linker.ld boot.o"
--o:myos.bin
+--passL:"-target i386 -nostdlib -T ./kernel/arch/i386/linker.ld boot.o"
+--out:"myos.bin"