wip zig kernel

as386.sed

@@ -0,0 +1,196 @@
+#\
+#       @(#)as386.sed	1.1 - 86/11/17\
+#\
+# This is a sed script which converts Intel 386 assembly code to Unix\
+# 386 assembly code\
+#\
+# This script does not attempt to convert 100% of the ASM386 source code,\
+# it cannot handle the following constructs:\
+#\
+# - strange segmentation schemes\
+# - data declarations beyond the simple db/dw/dd with simple init list\
+# - ascii strings\
+# - structure template addressing (i.e., [ebp].foo)\
+# - complex expressions (parenthesis and operators other than +-*/)\
+# - immediate operands that are not simple constants\
+# - immediate operands with automatically typed memory operands\
+# - source files in upper case\
+# - source files with continued lines\
+#\
+# A typical way to use this sed script is:\
+# tr "[A-Z]" "[a-z]" <infile | sed -f this-script >outfile\
+#\
+#\
+# Meaning of labels:\
+#\
+# cmpress	preserve comments, insert tabs, change '?' to '_'\
+# control	convert '$' control lines\
+# segment	convert segmentation directives\
+# equate	convert 'equ' directives\
+# data		convert db/dw/dd data declarations\
+# modifer	delete address/type modifiers\
+# registr	convert register names\
+# bincons	convert binary/octal/hex conatants\
+# address	regularize addess expressions, delete unneeded tabs\
+# normliz	normalize instruction formats (name-tab-opcode-tab-operands)\
+# operand	swap operands, convert scale/index/base address format\
+# opcode	append b/w to opcode for byte/word register operands\
+# comment	restore preserved comments\
+
+:cmpress
+h
+s/;.*$//
+s/[ 	]*$/	/
+s/[ 	][ 	]*/	/g
+s/\([][)(.,:*/+-]\)/	\1	/g
+s/	?	/	0	/g
+s/?/_/g
+s/[ 	][ 	]*/	/g
+
+:control
+s/^\$[	]*include	(	\([^	.)]*\)[^)]*)/#include	"\1.h"/
+s/^\$[	]*eject	/;	/
+/^\$/ s/^/;/
+
+:segment
+/	segment	e[or]	/ s/^/	.text	;/
+/	segment	ro	/ s/^/	.text	;/
+/	segment	rw	/ s/^/	.data	;/
+/	ends	/ s/^/;/
+/	stackseg	/ s/^/;/
+s/^[	]*name	\([^	]*\)/	.file	"\1"/
+/^[	]*end	/ s/^/;/
+/^[	]*assume	/ s/^/;/
+/^[	]*extrn	/ s/^/;/
+/^[	]*public	[^	,]*	,	/ {
+s/^[	]*public	/	.globl	/
+s/	,	.*$//
+G
+s/\n\([ 	]*\)public\([ 	]\)[^,]*,/\
+\1public\2/
+P
+D
+}
+s/^[	]*public	/	.globl	/
+s/^[	]*comm	/	.comm	/
+s/^\([^	][^	]*\)	proc	/\1	:	;proc	/
+/	endp	/ s/^/;/
+s/^\([^	][^	]*\)	label	/\1	:	;label	/
+s/^[	]*even	/	.even	/
+
+:equate
+s/^\([^	]*\)	equ	\(.*\)	$/#define	:	\1	\2	/
+
+:data
+s/^[	]*db	/	.byte	/
+s/^\([^	][^	]*\)	db	/\1	:	.byte	/
+s/^[	]*dw	/	.value	/
+s/^\([^	][^	]*\)	dw	/\1	:	.value	/
+s/^[	]*dd	/	.long	/
+s/^\([^	][^	]*\)	dd	/\1	:	.long	/
+/^[	]*dp	/ {
+s/^[	]*dp	/	.value	/
+s/$/\/selector of dp pointer/
+G
+s/\n\([ 	]*\)dp\([ 	]\)/\
+\1dd\2/
+P
+D
+}
+/^\([^	][^	]*\)	dp	/ {
+s/^\([^	][^	]*\)	dp	/\1:	.value	/
+s/$/\/selector of dp pointer/
+G
+s/\n[^ 	]*\([ 	]*\)dp\([ 	]\)/\
+\1dd\2/
+P
+D
+}
+s/^\([^	][^	]*\)	struc	/\1	:	;struc	/
+s/^\([^	][^	]*\)	record	/\1	:	;record	/
+
+:modifer
+s/	:	near	/	/g
+s/	:	far	/	/g
+s/	:	byte	/	/g
+s/	:	word	/	/g
+s/	:	dword	/	/g
+s/	short	/	/g
+s/	offset	/	$/g
+/	byte	ptr	/ s/$/?%al?/
+s/	byte	ptr	/	/g
+/	word	ptr	/ s/$/?%ax?/
+s/	word	ptr	/	/g
+s/	dword	ptr	/	/g
+s/	pword	ptr	/	/g
+
+:registr
+s/	e\([abcd]\)x	/	%e\1x	/g
+s/	\([abcd]\)\([hlx]\)	/	%\1\2	/g
+s/	e\([ds]\)i	/	%e\1i	/g
+s/	\([ds]\)i	/	%\1i	/g
+s/	e\([bs]\)p	/	%e\1p	/g
+s/	\([bs]\)p	/	%\1p	/g
+s/	\([cdefgs]\)s	/	%\1s	/g
+
+:bincons
+s/	\([01][01]*\)b	/	0b\1	/g
+s/	\([0-7][0-7]*\)[oq]	/	0\1	/g
+s/	\([0-9][0-9a-f]*\)h	/	0x\1	/g
+
+t address
+:address
+s/\[/+/g
+/;/ !s/	]	\.	/	+	/g
+s/	]//g
+s/	%\([^	]*\)	\*	\([248]\)	+	\([^	%][^	]*\)/	\3	+	%\1	*	\2/g
+s/	%\([^	]*\)	+	\([^	%][^	]*\)/	\2	+	%\1/g
+s/	%\([^	]*\)	\*	\([248]\)	-	\([^	%][^	]*\)/	-	\3	+	%\1	*	\2/g
+s/	%\([^	]*\)	-	\([^	%][^	]*\)/	-	\2	+	%\1/g
+s/	+	-	/	-	/g
+t address
+s/	\([)(,*/+-]\)/\1/g
+s/\([)(,*/+-]\)	/\1/g
+s/	:/:/g
+s/%\([cdefgs]\)s:	/%\1s:/g
+
+:normliz
+/:	/ !s/^\([^	;#][^	]*\)/	\1/
+/:	/ !s/^	\([^	+,-]*\)\([+-]\)/	\1	\2/g
+/:	/ !s/^	\([^	+,]*\)+%/	\1	+%/g
+/:	/ s/^\([^	]*\)	\([^	+,-]*\)\([+-]\)/\1	\2	\3/g
+/:	/ s/^\([^	]*\)	\([^	+,]*\)+%/\1	\2	+%/g
+s/+%\([^	,]*\)/(%\1)/g
+s/	+/	/g
+s/\([:,]\)+/\1/g
+
+:operand
+/[.;#]/ !s/^	\([^	]*\)	\([^,]*\),\([^	]*\)/	\1	\3,\2/
+/[.;#]/ !s/^\([^	][^	]*\)	\([^	]*\)	\([^,]*\),\([^	]*\)/\1	\2	\4,\3/
+/[.;#]/ !s/^	\([^	]*\)	\([0-9][0-9a-fx]*\)\([	,]\)/	\1	$\2\3/
+/[.;#]/ !s/^\([^	][^	]*\)	\([^	]*\)	\([0-9][0-9a-fx]*\)\([	,]\)/\1	\2	$\3\4/
+s/(%\([^)+*]*\)+%\([^)*]*\)\*\([248]\))/(%\1,%\2,\3)/g
+s/(%\([^)+*]*\)\*\([248]\)+%\([^)]*\))/(%\3,%\1,\2)/g
+s/(%\([^)+*]*\)+%\([^)]*\))/(%\1,%\2)/g
+s/(%\([^)+*]*\)\*\([248]\))/(,%\1,\2)/g
+
+:opcode
+/[	,]%[abcd][hl]/ s/$/?%al?/
+/[	,]%[abcd]x/ s/$/?%ax?/
+/[	,]%[ds]i/ s/$/?%ax?/
+/[	,]%[bs]p/ s/$/?%ax?/
+/?%al?/ s/^\([^	]*\)	\([^	]*\)	/\1	\2b	/
+/?%ax?/ s/^\([^	]*\)	\([^	]*\)	/\1	\2w	/
+s/^#define:/#define/
+s/?%a[xl]?//g
+
+:comment
+s/	*$//
+x
+/;/ !s/^.*$//
+s/\([ 	]*\);/;\1;/
+s/^[^;]*;//
+x
+G
+s/\n//
+s/;/\//

build.zig

@@ -10,17 +10,35 @@ pub fn build(b: *std.Build) void {
         .outputname = "bootloader.bin",
         .flags = &.{"-f bin"},
     });
-    const kernel = addNasmFiles(b, AddNasmFilesOptions{
+    //const kernel = addNasmFiles(b, AddNasmFilesOptions{
-        .filename = "src/kernel.asm",
+    //    .filename = "src/kernel.asm",
-        .outputname = "kernel.bin",
+    //    .outputname = "kernel.bin",
-        .flags = &.{"-f bin"},
+    //    .flags = &.{"-f bin"},
+    //});
+
+    const target = b.standardTargetOptions(.{
+        .default_target = .{
+            .os_tag = .uefi,
+            .cpu_arch = .x86,
+        },
+    });
+
+    const kernel_mod = b.addModule("kernel", .{
+        .root_source_file = b.path("src/kernel.zig"),
+        .target = target,
+    });
+
+    const kernel = b.addExecutable(.{
+        .root_module = kernel_mod,
+        .linkage = .static,
+        .name = "kernel",
     });
 
     const floppy = createFloppy(b, "main_floppy.img");
     formatFloppyFat12(b, floppy);
 
     var installToFloppy = installImgToFloppy(b, floppy, bootloader, &.{
-        NamedFile{ .file = kernel, .name = "::kernel.bin" },
+        NamedFile{ .file = kernel.getEmittedBin(), .name = "::kernel.bin" },
         NamedFile{ .file = b.path("src/reference_implementations/test.txt"), .name = "::test.txt" },
     });
 
@@ -29,7 +47,6 @@ pub fn build(b: *std.Build) void {
 
     b.getInstallStep().dependOn(&img_install.step);
 
-    const target = b.standardTargetOptions(.{});
     const fat_reference_mod = b.createModule(.{
         .root_source_file = b.path("src/reference_implementations/fat.zig"),
         .target = target,

src/definitions.asm

@@ -2,22 +2,12 @@
 org 0x0
 bits 16
 
-%define ENDL 0x0D, 0x0A
-
-start:
-;    ; print hello world message
-    mov si, msg_hello
-    call echo 
-
-.halt:
-	cli
-	hlt
-
 ; echo:
 ; print something to the screen
 ;  - ds:si points to string
 ;
-echo:
+global _echo:function
+_echo:
 	; save the registers we want to modify
 	push si
 	push ax
@@ -39,6 +29,3 @@ echo:
 	pop ax
 	pop si
 	ret
-
-
-msg_hello: db 'Hello, world!', ENDL, 0

src/kernel.zig

@@ -0,0 +1,25 @@
+fn BIOSprint(string: []const u8) void {
+    asm volatile (
+        \\pushw %%ax
+        \\pushw %%bx
+    );
+    for (string) |char| {
+        asm volatile (
+            \\movb $0x0E, %%ah
+            \\movb $0, %%bh
+            \\int $0x10
+            :
+            : [arg1] "{al}" (char),
+        );
+    }
+    asm volatile (
+        \\popw %%bx
+        \\popw %%ax
+    );
+}
+
+const std = @import("std");
+
+pub fn main() void {
+    BIOSprint("kernel loaded");
+}