i386: Add new arch support! (woefully incomplete)

arch/i386/i386_main.c

@@ -0,0 +1,30 @@
+#include <stdint.h>
+
+void main();
+ 
+void i386_main(void)
+{
+   extern uint32_t magic;
+ 
+   /* Uncomment the following if you want to be able to access the multiboot header */
+   /* extern void *mbd; */
+ 
+   if ( magic != 0x2BADB002 )
+   {
+      /* Something went not according to specs. Print an error */
+      /* message and halt, but do *not* rely on the multiboot */
+      /* data structure. */
+   }
+ 
+   /* You could either use multiboot.h */
+   /* (http://www.gnu.org/software/grub/manual/multiboot/multiboot.html#multiboot_002eh) */
+   /* or do your offsets yourself. The following is merely an example. */ 
+   //char * boot_loader_name =(char*) ((long*)mbd)[16];
+ 
+   /* Print a letter to screen to see everything is working: */
+   unsigned char *videoram = (unsigned char *)0xB8000;
+   videoram[0] = 65; /* character 'A' */
+   videoram[1] = 0x07; /* light grey (7) on black (0). */
+
+   main();
+}

arch/i386/include/arch/types.h

@@ -0,0 +1,23 @@
+/*
+    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
+
+    This file is part of Aedrix.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <arch-generic/types.h>
+
+#define arch_uint_ptr uint32

arch/i386/kernel.ld

@@ -0,0 +1,18 @@
+ENTRY (start)
+
+SECTIONS
+{
+	. = 0x00100000;
+	.text ALIGN (0x1000) : { *(.text*) *(.rodata*) }
+	.init : {
+		early_initcalls_start = .;
+		*(.earlyinitcalls*)
+		early_initcalls_end = .;
+		initcalls_start = .;
+		*(.driversubsysinitcalls*)
+		*(.deviceinitcalls*)
+		initcalls_end = .;
+	}
+	.data ALIGN (0x1000) : { *(.data*) }
+	.bss : { *(.bss*) *(COMMON*) }
+}

arch/i386/kernel.mk

@@ -0,0 +1,32 @@
+DIRNAME := arch/i386
+SUBDIRS := kernel
+
+include $(BASEDIR)/header.mk
+
+# Architecture-specific definitions
+CROSS_COMPILE ?= 
+ARCH_KCFLAGS = -m32
+ARCH_KLDFLAGS = -melf_i386
+
+all: aedrix-boot.img
+
+HD_IMAGE_SIZE := $(shell echo $$((4*1024*1024)))
+HD_NUM_BLOCKS := $(shell echo $$(($(HD_IMAGE_SIZE)/4096)))
+KERNEL_ARGS := 
+aedrix-boot.img: aedrix-kernel.elf
+	@echo '  BUILD   aedrix-boot.img'
+	$(V)dd if=/dev/zero of="$@" bs=4k count=$(HD_NUM_BLOCKS) 2>/dev/null
+	$(V)mkfs.vfat "$@" 1>/dev/null
+	$(V)syslinux "$@"
+	$(V)mcopy -i "$@" /usr/lib/syslinux/mboot.c32 ::mboot.c32
+	$(V)mcopy -i "$@" aedrix-kernel.elf ::kernel.bin
+	$(V)mcopy -i "$@" arch/i386/syslinux.cfg ::syslinux.cfg
+
+OBJS_$(d) := $(d)/start.o \
+	$(d)/i386_main.o
+
+KOBJS += $(OBJS_$(d))
+
+include $(BASEDIR)/footer.mk
+
+ARCH_QEMU_CMD = qemu-system-i386 -m 1024

arch/i386/kernel/kernel.mk

@@ -0,0 +1,10 @@
+DIRNAME := kernel
+SUBDIRS :=
+
+include $(BASEDIR)/header.mk
+
+OBJS_$(d) := $(d)/mmu.o
+
+KOBJS += $(OBJS_$(d))
+
+include $(BASEDIR)/footer.mk

arch/i386/kernel/mmu.c

@@ -0,0 +1,30 @@
+/*
+    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
+
+    This file is part of Aedrix.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <print.h>
+#include <types.h>
+#include <mm.h>
+
+void mmu_reinit() {
+}
+void declare_memory_region(void *lower, void *upper) {
+	(void)lower;
+	(void)upper;
+}

arch/i386/start.S

@@ -0,0 +1,56 @@
+/*
+    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
+
+    This file is part of Aedrix.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+.global start /* making entry point visible to linker */
+
+/* setting up the Multiboot header - see GRUB docs for details */
+.set ALIGN,    1<<0                     /* align loaded modules on page boundaries */
+.set MEMINFO,  1<<1                     /* provide memory map */
+.set FLAGS,    ALIGN | MEMINFO          /* this is the Multiboot 'flag' field */
+.set MAGIC,    0x1BADB002               /* 'magic number' lets bootloader find the header */
+.set CHECKSUM, -(MAGIC + FLAGS)         /* checksum required */
+
+.align 4
+.long MAGIC
+.long FLAGS
+.long CHECKSUM
+
+/* reserve initial kernel stack space */
+.set STACKSIZE, 0x4000                  /* that is, 16k. */
+.align 32
+.lcomm stack, STACKSIZE                 /* reserve 16k stack on a doubleword boundary */
+.comm  mbd, 4                           /* we will use this in i386_main */
+.comm  magic, 4                         /* we will use this in i386_main */
+
+start:
+    movl  $(stack + STACKSIZE), %esp    /* set up the stack */
+    movl  %eax, magic                   /* Multiboot magic number */
+    movl  %ebx, mbd                     /* Multiboot data structure */
+
+    call  i386_main                     /* call kernel proper */
+
+    cli
+hang:
+    hlt                                 /* halt machine should kernel return */
+    jmp   hang
+
+.globl atags_ptr
+atags_ptr:
+	.word 0

arch/i386/syslinux.cfg

@@ -0,0 +1,2 @@
+TIMEOUT 1
+DEFAULT mboot.c32 kernel.bin ''