Add i386 support

Makefile

@@ -10,7 +10,12 @@ $(COMPONENTS):
 
 disk: $(KERNEL_HDD)
 run: $(KERNEL_HDD)
-	qemu-system-x86_64 -m 2G -drive file=$(KERNEL_HDD),format=raw
+	qemu-system-$(ARCH) \
+	-m 16M \
+	-drive file=$(KERNEL_HDD),format=raw \
+	-smp 2 \
+	-enable-kvm \
+	-debugcon stdio
 
 ext/limine/limine-install:
 	$(MAKE) -C ext/limine/ limine-install

ext/limine.cfg

@@ -1,4 +1,5 @@
 TIMEOUT=5
+E9_OUTPUT=yes
 
 :KornOS
 PROTOCOL=stivale2

kernel/Makefile

@@ -8,7 +8,7 @@ LD              = ld -m elf_$(ARCH)
 CFLAGS          ?= -O2
 CFLAGS          := $(CFLAGS) $(ARCH_CFLAGS) \
                    -Wall -Wextra -pedantic -Wno-language-extension-token -std=gnu11 -I../ext/limine/stivale -fPIE
-LDFLAGS         := $(LDFLAGS) -T linker.ld 
+LDFLAGS         := $(LDFLAGS) -T linker.ld.$(ARCH) 
 
 
 TARGET := kernel

kernel/linker.ld.i386

@@ -0,0 +1,34 @@
+ENTRY(stivale2_main)
+
+SECTIONS
+{
+    . = 1M + 512K;
+
+    .stivale2hdr ALIGN(4K) :
+    {
+        KEEP(*(.stivalehdr))
+    }
+
+    .text ALIGN(4K) :
+    {
+        KEEP(*(.text*))
+    }
+
+    .rodata ALIGN(4K) :
+    {
+        KEEP(*(.rodata*))
+    }
+
+    .data ALIGN(4K) :
+    {
+        KEEP(*(.data*))
+    }
+
+    .bss ALIGN(4K) :
+    {
+        KEEP(*(COMMON))
+        KEEP(*(.bss*))
+    }
+
+    _stack = 1M;
+}

kernel/src/arch/i386/entry-stivale2.c

@@ -0,0 +1,28 @@
+#include <stivale2.h>
+#include <stdint.h>
+#include <stddef.h>
+
+#include "../../main.h"
+
+void stivale2_main(struct stivale2_struct *info);
+
+struct stivale2_header_tag_smp smp_request = {
+    .tag = {
+        .identifier = STIVALE2_HEADER_TAG_SMP_ID,
+        .next       = 0
+    },
+    .flags = 02
+};
+
+__attribute__((section(".stivale2hdr"), used))
+struct stivale2_header header2 = {
+    .entry_point = 0,
+    .stack       = 1024*1024,
+    .flags       = 0,
+    .tags        = 0
+};
+
+void stivale2_main(struct stivale2_struct *info) {
+	char *argv[3] = {"stivale2", info->bootloader_brand, info->bootloader_version};
+    kmain(3, argv);
+}

kernel/src/arch/i386/ops.c

@@ -0,0 +1,4 @@
+void halt_catch_fire() {
+    asm volatile ("cli");
+    while(1) asm volatile ("hlt");
+}

kernel/src/arch/i386/vga.c

@@ -0,0 +1,53 @@
+#include <stdint.h>
+#include <stddef.h>
+
+#include "vga.h"
+
+static const size_t VGA_WIDTH = 80;
+static const size_t VGA_HEIGHT = 25;
+ 
+static volatile size_t terminal_row;
+static volatile size_t terminal_column;
+static volatile uint8_t current_color = VGA_WHITE;
+static uint16_t *terminal_buffer = (uint16_t*)0xb8000;
+
+void vga_putc(char c) {
+	size_t index = terminal_row*VGA_WIDTH + terminal_column;
+	if(c == '\t') {
+		vga_putc(' ');
+		while(terminal_column % 8 != 0) {
+			vga_putc(' ');
+		}
+		return;
+	}
+	if(c != '\n' && c != '\t')
+		terminal_buffer[index] = (uint16_t)c | (uint16_t)(current_color) << 8;
+
+	if (c == '\n' || ++terminal_column == VGA_WIDTH) {
+		terminal_column = 0;
+		if (++terminal_row == VGA_HEIGHT)
+			terminal_row = 0;
+	}
+}
+
+void vga_puts(char *c) {
+	char cur = *(c++);
+	while(cur != '\0') {
+		vga_putc(cur);
+		cur = *(c++);
+	}
+}
+
+void vga_setcolor(uint8_t new_color) {
+	current_color = new_color;
+}
+
+void vga_write_elsewhere(char *c, size_t y, size_t x) {
+	size_t old_row = terminal_row;
+	size_t old_column = terminal_column;
+	terminal_row = y;
+	terminal_column = x;
+	vga_puts(c);
+	terminal_row=old_row;
+	terminal_column=old_column;
+}

kernel/src/arch/i386/vga.h

@@ -0,0 +1,24 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#define VGA_BLACK        0
+#define VGA_BLUE         1
+#define VGA_GREEN        2
+#define VGA_CYAN         3
+#define VGA_RED          4
+#define VGA_PURPLE       5
+#define VGA_BROWN        6
+#define VGA_GRAY         7
+#define VGA_DARK_GRAY    8
+#define VGA_LIGHT_BLUE   9
+#define VGA_LIGH_GREEN   10
+#define VGA_LIGHT_CYAN   11
+#define VGA_LIGHT_RED    12
+#define VGA_LIGHT_PURPLE 13
+#define VGA_YELLOW       14
+#define VGA_WHITE        15
+
+void vga_putc(char c);
+void vga_puts(char *c);
+void vga_setcolor(uint8_t color);
+void vga_write_elsewhere(char *c, size_t y, size_t x);