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/*
* 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.
*
*/
// Complain if some pleb's using a linux toolchain and not cross-compiling
#if defined(__linux__)
#error "You're not using a cross-compiler. Good luck with that."
#endif
#include <toast.h>
// vv-- Put me somewhere --vv
uint32_t TOTAL_MEMORY = 0; // Total memory. Typically set by k_tally_available_memory().
// It must be initialised to 0 so that if it's not set otherwise, nothing will think there's memory available
bool KERNEL_OPTION_QUIET = FALSE;
bool KERNEL_OPTION_SILENT = FALSE;
bool KERNEL_OPTION_ESHELL = FALSE;
// ^^-- put me somewhere --^
void kernel_main(multiboot_info_t *mbd, uint32_t magic)
{
//*********************************************************
// First things first. Parse the command line. Quick guide:
//
// o quiet - Don't print so much stuff to the screen during boot
// o silent - Don't print anything at all during boot (implies quiet)
// o eshell - (RESERVED) Will be used to enter emergency shell
//
if (string_contains( (char*)(mbd->cmdline) , "quiet"))
KERNEL_OPTION_QUIET = TRUE;
if (string_contains( (char*)(mbd->cmdline) , "silent"))
{
KERNEL_OPTION_QUIET = TRUE;
KERNEL_OPTION_SILENT = TRUE;
}
if (string_contains( (char*)(mbd->cmdline) , "eshell"))
KERNEL_OPTION_ESHELL = TRUE;
//*********************************************************
//*********************************************************
// Do some important things before we forget
k_tally_available_memory(mbd);
// Init the text console and colours
console_init();
console_set_colors(COLOR_BRIGHT_GRAY, COLOR_BLACK);
console_swap_colors();
console_set_colors(COLOR_BRIGHT_GRAY, COLOR_BLACK);
console_clear();
//*********************************************************
if (!KERNEL_OPTION_QUIET)
{
// Print some stuff about the environment
console_print("Here is kernel_main()\n");
console_print("Bootloader: %s\n",mbd->boot_loader_name);
console_print("Kernel: %s\n",mbd->cmdline);
console_print("Flags: %b\n",mbd->flags);
console_print("Boot Device: %x\n",mbd->boot_device);
// Dump some info about the memory blocks/regions available/reserved
k_dump_memory_blocks(mbd);
}
if (!KERNEL_OPTION_SILENT)
{
console_print("Welcome to Toast v%d.%d (nickname '%s')\nMemory: %dMiB",
KERNEL_VERSION_MAJ,
KERNEL_VERSION_MIN,
KERNEL_NICKNAME,
TOTAL_MEMORY/1048576);
}
//panic(0x4655434B); // (TEST) testing panic
}
/*********************************************************
* Tally/total the amount of available memory and store
* it for later use. Returns pointer to total mem figure
********************************************************/
uint32_t *k_tally_available_memory(multiboot_info_t *mbd)
{
multiboot_memory_map_t* mmap = (multiboot_memory_map_t*)mbd->mmap_addr;
TOTAL_MEMORY = 0;
while((uint32_t)mmap < mbd->mmap_addr + mbd->mmap_length)
{
mmap = (multiboot_memory_map_t*)( (uint32_t)mmap + mmap->size + sizeof(uint32_t) );
if (mmap->type == 1) // available
TOTAL_MEMORY += (uint32_t)mmap->len;
}
return &TOTAL_MEMORY;
}
/*********************************************************
* Dump information about the blocks of memory. What
* starts and finishes where and available/reserved
********************************************************/
void k_dump_memory_blocks(multiboot_info_t *mbd)
{
multiboot_memory_map_t* mmap = (multiboot_memory_map_t*)mbd->mmap_addr;
// While we're pointing to a mem map struct within the supplied range...
while((uint32_t)mmap < mbd->mmap_addr + mbd->mmap_length)
{
mmap = (multiboot_memory_map_t*)( (uint32_t)mmap + mmap->size + sizeof(uint32_t) );
console_print("[");
// Save current console colours
console_swap_colors();
if (mmap->type == 1)
{
console_set_colors(COLOR_GREEN, COLOR_BLACK);
console_print(" FREE ");
} else {
console_set_colors(COLOR_RED, COLOR_BLACK);
console_print(" RESERVED ");
}
// Restore old console colours
console_swap_colors();
console_print("] 0x%x to 0x%x = %d bytes\n",
(uint32_t)mmap->addr,
(uint32_t)mmap->addr + (uint32_t)mmap->len-1,
(uint32_t)mmap->len
);
}
}
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