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os-k/kaleid/kernel/init/init.c

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Kernel entry point //
// //
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// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 3 of the License, or //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
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#include <kernel/term.h>
#include <kernel/panic.h>
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#include <kernel/mm.h>
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//
// BootInfo_t initialization. It is necessary because grub will potentially be
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// wiped since it is below 1MB.... And we must reorganize all that stuff.
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//
void InitBootInfo(multiboot_info_t *mbi)
{
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extern uint MB_header;
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char *okStr = "available";
char *noStr = "unavailable";
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// We need the multiboot structure
KalAlwaysAssert(mbi);
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//Retrieves the bootloader flags to ensure infos are valid
GetBootInfo(btldr).grubFlags = mbi->flags;
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_BOOT_LOADER_NAME) {
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GetBootInfo(btldr).grubName = (char*)(ullong)(mbi->boot_loader_name);
GetBootInfo(btldr).mbHeaderAddr = (void*)(ullong)&MB_header;
GetBootInfo(btldr).valid = 1;
}
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MODS) {
GetBootInfo(btldr).modulesCount = mbi->mods_count;
GetBootInfo(btldr).modulesAddr = (void*)(ullong)mbi->mods_addr;
}
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//Retrieves the drives informations
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_DRIVE_INFO) {
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GetBootInfo(drives).bufferLength = mbi->drives_length;
GetBootInfo(drives).bufferAddr = (void*)(ullong)mbi->drives_addr;
GetBootInfo(drives).bufferValid = 1;
}
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_BOOTDEV) {
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GetBootInfo(drives).bootDrv = mbi->boot_device;
GetBootInfo(drives).drvValid = 1;
}
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//Retrieves the memory informations
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MEMORY) {
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GetBootInfo(memory).lowMemory = mbi->mem_lower;
GetBootInfo(memory).upMemory = mbi->mem_upper;
GetBootInfo(memory).memValid = 1;
}
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MEM_MAP) {
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GetBootInfo(memory).mapAddr = (void*)(ullong)mbi->mmap_addr;
GetBootInfo(memory).mapLength = mbi->mmap_length;
GetBootInfo(memory).mapValid = 1;
}
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// XXX assign video infos, but unused at this time
// Retrieves the firmware infos
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_CONFIG_TABLE) {
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GetBootInfo(firmware).romTable = mbi->config_table;
GetBootInfo(firmware).romValid = 1;
}
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if (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_APM_TABLE) {
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GetBootInfo(firmware).apmTable = mbi->apm_table;
GetBootInfo(firmware).apmValid = 1;
}
//Now we check (debug)
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/*DebugLog("[InitBootInfo] Flags : %b\n\n",
GetBootInfo(btldr).grubFlags);*/
DebugLog("[InitBootInfo] Boot loader %s\n",
GetBootInfo(btldr).valid ? okStr : noStr);
DebugLog("[InitBootInfo] Boot drive %s\n",
GetBootInfo(drives).drvValid ? okStr : noStr);
DebugLog("[InitBootInfo] Disk buffer %s\n",
GetBootInfo(drives).bufferValid ? okStr : noStr);
DebugLog("[InitBootInfo] Basic mem %s\n",
GetBootInfo(memory).memValid ? okStr : noStr);
DebugLog("[InitBootInfo] Memory map %s\n",
GetBootInfo(memory).mapValid ? okStr : noStr);
DebugLog("[InitBootInfo] ROM table %s\n",
GetBootInfo(firmware).romValid ? okStr : noStr);
DebugLog("[InitBootInfo] APM table %s\n\n",
GetBootInfo(firmware).apmValid ? okStr : noStr);
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}
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//
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// Entry point of the Kaleid kernel
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//
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noreturn void StartKern(multiboot_info_t *mbInfo, int mbMagic)
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{
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// We're not ready to deal with interrupts
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DisableIRQs();
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// Kernel terminals
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InitTerms();
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//Hello world because why not
KernLog("%c%c%c OS/K\n\n", 219, 219, 219);
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KalAlwaysAssert(mbMagic == MULTIBOOT_BOOTLOADER_MAGIC);
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KernLog("[Init] We have magic : %x\n\n", mbMagic);
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//Initialize the BootInfo_t structure
InitBootInfo(mbInfo);
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//Memory mapping
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error_t mapBad = InitMemoryMap();
if (mapBad)
StartPanic("[Init] The memory map failed to initialize. Error : %d", mapBad);
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// We're out
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KernLog("\n[Init] Evil never dies !");
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CrashSystem(); //yay
}