From b1322ac720b4a04175dae0e60e627e81e19f1cb9 Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Sun, 21 Feb 2021 18:11:26 +0200
Subject: Kconfig

---
 .config          | 30 ++++++++++++++++++++++++++++++
 .gitignore       |  3 +++
 Kconfig          |  9 +++++++++
 drivers/Kconfig  | 42 ++++++++++++++++++++++++++++++++++++++++++
 drivers/makefile | 18 ++++++++++++++++++
 makefile         | 11 ++++++-----
 src/kernel.cc    |  7 +++++--
 7 files changed, 113 insertions(+), 7 deletions(-)
 create mode 100644 .config
 create mode 100644 Kconfig
 create mode 100644 drivers/Kconfig

diff --git a/.config b/.config
new file mode 100644
index 0000000..1cfccc9
--- /dev/null
+++ b/.config
@@ -0,0 +1,30 @@
+
+#
+# Build
+#
+CONFIG_EXTRA_CXX_FLAGS=""
+CONFIG_OBJ_DIR="build"
+# end of Build
+
+#
+# Drivers
+#
+
+#
+# Video
+#
+CONFIG_video0_enable=y
+CONFIG_video0_driver_cga=y
+# CONFIG_video0_driver_vga is not set
+CONFIG_VIDEO0_CLASS="CGA"
+CONFIG_VIDEO0_CONSOLE=y
+# end of Video
+
+#
+# Serial ports
+#
+CONFIG_serial0_enable=y
+CONFIG_SERIAL0_CLASS="SerialPort"
+CONFIG_SERIAL0_CONSOLE=y
+# end of Serial ports
+# end of Drivers
diff --git a/.gitignore b/.gitignore
index bd048b4..5ef19a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,7 @@ glitch.iso
 build/
 isodir/
 
+drivers/hardware.h
+.config.old
+
 *.tar*
diff --git a/Kconfig b/Kconfig
new file mode 100644
index 0000000..9b05045
--- /dev/null
+++ b/Kconfig
@@ -0,0 +1,9 @@
+menu "Build"
+    config EXTRA_CXX_FLAGS
+        string "Additional cxx flags"
+    config OBJ_DIR
+        string "Build location"
+        default "build"
+endmenu
+
+source 'drivers/Kconfig'
diff --git a/drivers/Kconfig b/drivers/Kconfig
new file mode 100644
index 0000000..5f33772
--- /dev/null
+++ b/drivers/Kconfig
@@ -0,0 +1,42 @@
+menu "Drivers"
+
+    menu "Video"
+        config video0_enable
+            bool "Enable video0"
+            default y
+
+        choice video0_driver
+            prompt "video0 driver"
+            depends on video0_enable
+            config video0_driver_cga
+                bool "CGA"
+            config video0_driver_vga
+                bool "VGA"
+        endchoice
+
+        config VIDEO0_CLASS
+            string "video0 class"
+            default "CGA" if video0_driver_cga
+            default "VGA" if video0_driver_vga
+            depends on video0_enable
+        config VIDEO0_CONSOLE
+            bool "use video0 for debug output"
+            default y
+            depends on video0_enable
+    endmenu
+
+    menu "Serial ports"
+        config serial0_enable
+            bool "Enable serial0"
+            default y
+
+        config SERIAL0_CLASS
+            string "serial0 class"
+            default "SerialPort"
+            depends on serial0_enable
+        config SERIAL0_CONSOLE
+            bool "Use serial0 for debug output"
+            default y
+            depends on serial0_enable
+    endmenu
+endmenu
diff --git a/drivers/makefile b/drivers/makefile
index 0d9071a..ad255c4 100644
--- a/drivers/makefile
+++ b/drivers/makefile
@@ -1,2 +1,20 @@
 CXX_OBJ += drivers/cga.o \
 	   drivers/serial.o
+
+HWH := drivers/hardware.h
+autogen := $(autogen) $(HWH)
+
+$(HWH): .config
+	@echo "  GEN $@"
+	@echo \/\* autogenerated hardware description \*\/ > $(HWH)
+	@echo \#pragma once >> $(HWH)
+ifdef CONFIG_video0_enable
+	@echo \#define HAS_VIDEO0 >> $(HWH)
+	@echo $(CONFIG_VIDEO0_CLASS) video0\; >> $(HWH)
+	@echo constexpr bool video0_console = true\; >> $(HWH)
+endif
+ifdef CONFIG_serial0_enable
+	@echo \#define HAS_SERIAL0 >> $(HWH)
+	@echo $(CONFIG_SERIAL0_CLASS) serial0\; >> $(HWH)
+	@echo constexpr bool serial0_console = true\; >> $(HWH)
+endif
diff --git a/makefile b/makefile
index 2d9460d..bbd42a4 100644
--- a/makefile
+++ b/makefile
@@ -1,5 +1,9 @@
 include toolchain.makefile
-OBJ_DIR := build
+include .config
+OBJ_DIR != echo $(CONFIG_OBJ_DIR)
+
+.PHONY: default clean test check-grub run
+default: glitch.elf
 
 include libk/makefile
 include src/makefile
@@ -12,10 +16,7 @@ CXX_TEST_OBJ := $(addprefix $(OBJ_DIR)/, $(CXX_TEST_OBJ))
 CXX_INCLUDE := $(addprefix -I, $(CXX_INCLUDE))
 CXX_SYSTEM_INCLUDE := $(addprefix -isystem, $(CXX_SYSTEM_INCLUDE))
 
-.PHONY: default clean test check-grub run
-default: glitch.elf
-
-glitch.elf: $(AS_OBJ) $(CXX_OBJ)
+glitch.elf: $(autogen) $(AS_OBJ) $(CXX_OBJ)
 	@echo "  LD  $@"
 	@$(LD) $(LD_FLAGS) -o $@ $(AS_OBJ) $(CXX_OBJ)
 
diff --git a/src/kernel.cc b/src/kernel.cc
index 37773e1..ff95d16 100644
--- a/src/kernel.cc
+++ b/src/kernel.cc
@@ -15,8 +15,7 @@
 #include "idt.h"
 #include "serial.h"
 
-SerialPort serial0;
-CGA video0;
+#include "hardware.h"
 
 typedef void (*constructor)();
 
@@ -32,9 +31,13 @@ void dump_multiboot(uint32_t mb_magic, uint32_t mb_addr);
 void dump_gdt();
 
 void kernel_main([[maybe_unused]] uint32_t mb_magic, [[maybe_unused]] uint32_t mb_addr) {
+#ifdef HAS_SERIAL0
   if (serial0.self_check()) Console::set(&serial0);
+#endif
 
+#ifdef HAS_VIDEO0
   Console::set(&video0);
+#endif
 
   printk("Hello, kernel World!\n");
 
-- 
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