build: Introduce kconf for kernel configuration

The kernel will be configured by a per-arch config file. The config file
for the AMD64 port exists at sys/arch/amd64/conf/GENERIC

Signed-off-by: Ian Moffett <ian@osmora.org>

6 files changed, 163 insertions, 0 deletions

diff --git a/tools/kconf/.gitignore b/tools/kconf/.gitignore
new file mode 100644
index 0000000..ccb5c4c
--- /dev/null
+++ b/tools/kconf/.gitignore
@@ -0,0 +1,3 @@
+*.tab.c
+*.tab.h
+*.yy.c
diff --git a/tools/kconf/Makefile b/tools/kconf/Makefile
new file mode 100644
index 0000000..c6df7ee
--- /dev/null
+++ b/tools/kconf/Makefile
@@ -0,0 +1,9 @@
+kconf:
+	bison -d grammer.y
+	flex scan.l
+	gcc lex.yy.c grammer.tab.c -lfl -o kconf
+
+clean:
+	rm grammer.tab.*
+	rm lex.yy.c
+	rm kconf
diff --git a/tools/kconf/build b/tools/kconf/build
new file mode 100755
index 0000000..7544eac
--- /dev/null
+++ b/tools/kconf/build
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+bison -d grammer.y
+flex scan.l
+gcc lex.yy.c grammer.tab.c -lfl -o kconf
diff --git a/tools/kconf/grammer.y b/tools/kconf/grammer.y
new file mode 100644
index 0000000..2f131fc
--- /dev/null
+++ b/tools/kconf/grammer.y
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+%{
+#include <stdio.h>
+#include <stdlib.h>
+
+int yylex();
+int yyerror(char *s);
+%}
+
+%union {
+    char *str;
+    int num;
+}
+
+%token OPTION SETVAL
+%token <str> IDENTIFIER
+%token YES NO
+%token NUMBER STRING
+
+%type <str> str STRING
+%type <num> yes_or_no YES NO
+%type <num> num NUMBER
+
+%%
+
+input:
+     | line input
+     ;
+
+line: OPTION IDENTIFIER yes_or_no {
+        printf("-D__%s=%d ", $2, $3);
+        free($2);
+    }
+    | SETVAL IDENTIFIER num {
+        printf("-D__%s=%d " , $2, $3);
+        free($2);
+    }
+    | SETVAL IDENTIFIER str {
+        printf("-D__%s=%s ", $2, $3);
+        free($2);
+        free($3);
+    }
+
+yes_or_no: YES { $$ = 1; }
+         | NO  { $$ = 0; }
+         ;
+
+num: NUMBER { $$ = $1; }
+str: STRING { $$ = $1; }
+
+%%
+
+int
+main(void)
+{
+    yyparse();
+    printf("\n");
+}
diff --git a/tools/kconf/kconf b/tools/kconf/kconf
new file mode 100755
index 0000000..1c50c3a
--- /dev/null
+++ b/tools/kconf/kconf
diff --git a/tools/kconf/scan.l b/tools/kconf/scan.l
new file mode 100644
index 0000000..e416241
--- /dev/null
+++ b/tools/kconf/scan.l
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+%{
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include "grammer.tab.h"
+
+    int yyerror(char *e);
+%}
+
+%%
+
+"option"                    { return OPTION; }
+"setval"                    { return SETVAL; }
+"yes"                       { return YES; }
+"no"                        { return NO;  }
+\"([^\"])*\"                { yylval.str = strdup(yytext); return STRING; }
+[a-zA-Z_][a-zA-Z0-9_]+      { yylval.str = strdup(yytext); return IDENTIFIER; }
+[0-9]+                      { yylval.num = atoi(yytext); return NUMBER; }
+[ \t]                       { /* Ignore */ }
+[\/\/.*]                    { /* Ignore */ }
+\n                          { /* IGnore */ }
+"//".*                      { /* Ignore */ }
+.                           { /* Ignore */ }
+
+%%
+
+int
+yyerror(char *e)
+{
+    printf("\n** kconf: %s **", e);
+    return 0;
+}