116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/*
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* Copyright (c) 2011 Kevin Lange. All rights reserved.
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*
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* Developed by: ToAruOS Kernel Development Team
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* http://github.com/klange/osdev
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal with the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimers.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimers in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the ToAruOS Kernel Development Team, Kevin Lange,
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* nor the names of its contributors may be used to endorse
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* or promote products derived from this Software without specific prior
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* written permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* WITH THE SOFTWARE.
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*/
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#include <system.h>
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#include <boot.h>
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#include <ext2.h>
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/*
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* kernel entry point
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*
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* This is the C entry point for the kernel.
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* It is called by the assembly loader and is passed
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* multiboot information, if available, from the bootloader.
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*
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* The kernel boot process does the following:
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* - Align the dumb allocator's heap pointer
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* - Initialize the x86 descriptor tables (global, interrupts)
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* - Initialize the interrupt handlers (ISRS, IRQ)
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* - Load up the VGA driver.
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* - Initialize the hardware drivers (PIC, keyboard)
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* - Set up paging
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* - Initialize the kernel heap (klmalloc)
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* [Further booting]
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*
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* After booting, the kernel will display its version and dump the
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* multiboot data from the bootloader. It will then proceed to print
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* out the contents of the initial ramdisk image.
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*/
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int main(struct multiboot *mboot_ptr, uint32_t mboot_mag)
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{
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enum BOOTMODE boot_mode = unknown; /* Boot Mode */
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char * ramdisk = NULL;
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if (mboot_mag == MULTIBOOT_EAX_MAGIC) {
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boot_mode = multiboot;
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/* Realign memory to the end of the multiboot modules */
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kmalloc_startat(0x200000);
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if (mboot_ptr->flags & (1 << 3)) {
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if (mboot_ptr->mods_count > 0) {
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uint32_t module_start = *((uint32_t *) mboot_ptr->mods_addr);
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uint32_t module_end = *(uint32_t *) (mboot_ptr->mods_addr + 4);
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ramdisk = (char *)kmalloc(module_end - module_start);
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memcpy(ramdisk, (char *)module_start, module_end - module_start);
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}
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}
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} else {
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/*
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* This isn't a multiboot attempt. We were probably loaded by
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* Mr. Boots, our dedicated boot loader. Verify this...
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*/
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boot_mode = mrboots;
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}
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/* Initialize core modules */
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gdt_install(); /* Global descriptor table */
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idt_install(); /* IDT */
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isrs_install(); /* Interrupt service requests */
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irq_install(); /* Hardware interrupt requests */
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init_video(); /* VGA driver */
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/* Hardware drivers */
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timer_install();
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keyboard_install();
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serial_install();
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/* Memory management */
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paging_install(mboot_ptr->mem_upper);
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heap_install();
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/* Kernel Version */
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settextcolor(12, 0);
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kprintf("[%s %s]\n", KERNEL_UNAME, KERNEL_VERSION_STRING);
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if (boot_mode == multiboot) {
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/* Print multiboot information */
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dump_multiboot(mboot_ptr);
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if (mboot_ptr->flags & (1 << 3)) {
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if (mboot_ptr->mods_count > 0) {
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initrd_mount((uintptr_t)ramdisk, 0);
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}
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}
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}
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start_shell();
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return 0;
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}
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