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#include <types.h>
#include <config.h>
#include "multiboot.h"
#include "monitor.h"
#include "sys.h"
#include <task/idt.h>
#include <task/timer.h>
#include <task/task.h>
#include <mem/gdt.h>
#include <mem/paging.h>
#include <mem/mem.h>
#include <linker/elf.h>
/* The kernel's main procedure. This function is called in loader_.asm.
This function calls the initializer functions for all system parts.
It then loads the modules the kernel was given by the bootloader.
This function never returns : once multitasking is started for good,
the execution flow of this function is never returned to. */
extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
ASSERT(magic == MULTIBOOT_BOOTLOADER_MAGIC);
size_t totalRam = 0;
uint32_t i;
mem_placementAddr = ((size_t)&end & 0xFFFFF000) + 0x1000;
mbd->cmdline += K_HIGHHALF_ADDR; mbd->mods_addr += K_HIGHHALF_ADDR;
module_t *mods = (module_t*)mbd->mods_addr;
for (i = 0; i < mbd->mods_count; i++) {
mods[i].mod_start += K_HIGHHALF_ADDR;
mods[i].mod_end += K_HIGHHALF_ADDR;
mods[i].string += K_HIGHHALF_ADDR;
if (mods[i].mod_end > mem_placementAddr)
mem_placementAddr = (mods[i].mod_end & 0xFFFFF000) + 0x1000;
}
monitor_clear();
monitor_write(K_OS_NAME);
monitor_write(" version ");
monitor_write(K_OS_VER);
monitor_write(" codename '");
monitor_write(K_OS_CODENAME);
monitor_write("' starting up :\n");
idt_init();
totalRam = ((mbd->mem_upper + mbd->mem_lower) * 1024);
paging_init(totalRam);
gdt_init();
paging_cleanup();
_no_more_ksbrk = true;
//kheap_init();
timer_init(30);
tasking_init();
monitor_write("\nLoading modules :\n");
for (i = 0; i < mbd->mods_count; i++) {
monitor_write(" * ");
monitor_write((char*)mods[i].string);
if (elf_check((uint8_t*)mods[i].mod_start)) {
monitor_write(" : Invalid ELF file\n");
} else {
process *pr = elf_exec((uint8_t*)mods[i].mod_start, PL_USER);
if (pr == 0) {
monitor_write(" : Error loading\n");
} else {
monitor_write(" : OK, pid="); monitor_writeDec(pr->pid); monitor_write("\n");
}
}
}
monitor_write("Giving control to userland processes.\n\n");
sti();
schedule();
PANIC("Should never happen. Something probably went wrong with multitasking.");
}
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