224 lines
7.5 KiB
C
224 lines
7.5 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* The ToAruOS kernel is released under the terms of the
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* University of Illinois / NCSA License.
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*
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* Copyright (C) 2011-2014 Kevin Lange. All rights reserved.
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* Copyright (C) 2012 Markus Schober
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* Copyright (C) 2014 Lioncash
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*
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* Dedicated to the memory of
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* Dennis Ritchie
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* 1941-2011
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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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#include <fs.h>
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#include <logging.h>
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#include <process.h>
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#include <shm.h>
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#include <args.h>
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#include <module.h>
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uintptr_t initial_esp = 0;
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fs_node_t * ramdisk_mount(uintptr_t, size_t);
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#ifdef EARLY_BOOT_LOG
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#define EARLY_LOG_DEVICE 0x3F8
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static uint32_t _early_log_write(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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for (unsigned int i = 0; i < size; ++i) {
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outportb(EARLY_LOG_DEVICE, buffer[i]);
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}
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return size;
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}
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fs_node_t _early_log = { .write = &_early_log_write };
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#define ENABLE_EARLY_BOOT_LOG(level) do { debug_file = &_early_log; debug_level = (level); } while (0)
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#define DISABLE_EARLY_BOOT_LOG() do { debug_file = NULL; debug_level = NOTICE; } while (0)
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#else
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#define ENABLE_EARLY_BOOT_LOG(level)
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#define DISABLE_EARLY_BOOT_LOG()
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#endif
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/*
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* multiboot i386 (pc) kernel entry point
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*/
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int kmain(struct multiboot *mboot, uint32_t mboot_mag, uintptr_t esp) {
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initial_esp = esp;
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extern char * cmdline;
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uint32_t mboot_mods_count = 0;
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mboot_mod_t * mboot_mods = NULL;
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mboot_ptr = mboot;
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ENABLE_EARLY_BOOT_LOG(0);
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assert(mboot_mag == MULTIBOOT_EAX_MAGIC && "Didn't boot with multiboot, not sure how we got here.");
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debug_print(NOTICE, "Processing Multiboot information.");
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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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if (mboot_ptr->flags & (1 << 3)) {
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debug_print(NOTICE, "There %s %d module%s starting at 0x%x.", mboot_ptr->mods_count == 1 ? "is" : "are", mboot_ptr->mods_count, mboot_ptr->mods_count == 1 ? "" : "s", mboot_ptr->mods_addr);
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debug_print(NOTICE, "Current kernel heap start point would be 0x%x.", &end);
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if (mboot_ptr->mods_count > 0) {
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uintptr_t last_mod = (uintptr_t)&end;
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uint32_t i;
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mboot_mods = (mboot_mod_t *)mboot_ptr->mods_addr;
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mboot_mods_count = mboot_ptr->mods_count;
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for (i = 0; i < mboot_ptr->mods_count; ++i ) {
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mboot_mod_t * mod = &mboot_mods[i];
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uint32_t module_start = mod->mod_start;
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uint32_t module_end = mod->mod_end;
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if ((uintptr_t)mod + sizeof(mboot_mod_t) > last_mod) {
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/* Just in case some silly person put this *behind* the modules... */
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last_mod = (uintptr_t)mod + sizeof(mboot_mod_t);
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}
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debug_print(NOTICE, "Module %d is at 0x%x:0x%x", i, module_start, module_end);
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if (last_mod < module_end) {
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last_mod = module_end;
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}
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}
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debug_print(NOTICE, "Moving kernel heap start to 0x%x", last_mod);
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kmalloc_startat(last_mod);
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}
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}
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paging_install(mboot_ptr->mem_upper + mboot_ptr->mem_lower);
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if (mboot_ptr->flags & (1 << 6)) {
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debug_print(NOTICE, "Parsing memory map.");
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mboot_memmap_t * mmap = (void *)mboot_ptr->mmap_addr;
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while ((uintptr_t)mmap < mboot_ptr->mmap_addr + mboot_ptr->mmap_length) {
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if (mmap->type == 2) {
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for (unsigned long long int i = 0; i < mmap->length; i += 0x1000) {
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if (mmap->base_addr + i > 0xFFFFFFFF) break; /* xxx */
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debug_print(INFO, "Marking 0x%x", (uint32_t)(mmap->base_addr + i));
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paging_mark_system((mmap->base_addr + i) & 0xFFFFF000);
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}
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}
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mmap = (mboot_memmap_t *) ((uintptr_t)mmap + mmap->size + sizeof(uintptr_t));
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}
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}
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paging_finalize();
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{
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char cmdline_[1024];
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size_t len = strlen((char *)mboot_ptr->cmdline);
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memmove(cmdline_, (char *)mboot_ptr->cmdline, len + 1);
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/* Relocate the command line */
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cmdline = (char *)kmalloc(len + 1);
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memcpy(cmdline, cmdline_, len + 1);
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}
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/* Memory management */
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heap_install(); /* Kernel heap */
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if (cmdline) {
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args_parse(cmdline);
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}
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vfs_install();
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tasking_install(); /* Multi-tasking */
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timer_install(); /* PIC driver */
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fpu_install(); /* FPU/SSE magic */
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syscalls_install(); /* Install the system calls */
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shm_install(); /* Install shared memory */
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modules_install(); /* Modules! */
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DISABLE_EARLY_BOOT_LOG();
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/* Load modules from bootloader */
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debug_print(NOTICE, "%d modules to load", mboot_mods_count);
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for (unsigned int i = 0; i < mboot_ptr->mods_count; ++i ) {
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mboot_mod_t * mod = &mboot_mods[i];
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uint32_t module_start = mod->mod_start;
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uint32_t module_end = mod->mod_end;
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size_t module_size = module_end - module_start;
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if (!module_quickcheck((void *)module_start)) {
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debug_print(NOTICE, "Loading ramdisk: 0x%x:0x%x", module_start, module_end);
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ramdisk_mount(module_start, module_size);
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} else {
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debug_print(NOTICE, "Loading a module: 0x%x:0x%x", module_start, module_end);
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module_data_t * mod_info = (module_data_t *)module_load_direct((void *)(module_start), module_size);
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if (mod_info) {
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debug_print(NOTICE, "Loaded: %s", mod_info->mod_info->name);
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}
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}
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}
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/* Map /dev to a device mapper */
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map_vfs_directory("/dev");
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if (args_present("root")) {
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vfs_mount_type("ext2", args_value("root"), "/");
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}
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if (args_present("start")) {
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char * c = args_value("start");
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if (!c) {
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debug_print(WARNING, "Expected an argument to kernel option `start`. Ignoring.");
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} else {
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debug_print(NOTICE, "Got start argument: %s", c);
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boot_arg = strdup(c);
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}
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}
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if (!fs_root) {
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debug_print(CRITICAL, "No root filesystem is mounted. Skipping init.");
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map_vfs_directory("/");
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switch_task(0);
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}
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/* Prepare to run /bin/init */
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char * argv[] = {
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"/bin/init",
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boot_arg,
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NULL
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};
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int argc = 0;
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while (argv[argc]) {
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argc++;
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}
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system(argv[0], argc, argv); /* Run init */
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return 0;
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}
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