/*
* Bootstrap-CPU start; we came from head.S
*/
void __no_return kernel_start(void)
{
/* Before anything else, zero the bss section. As said by C99:
* “All objects with static storage duration shall be inited
* before program startup”, and that the implicit init is done
* with zero. Kernel assembly code also assumes a zeroed BSS
* space */
clear_bss();
/*
* Very-early setup: Do not call any code that will use
* printk(), `current', per-CPU vars, or a spin lock.
*/
setup_idt();
schedulify_this_code_path(BOOTSTRAP);
/*
* Memory Management init
*/
print_info();
/* First, don't override the ramdisk area (if any) */
ramdisk_init();
/* Then discover our physical memory map .. */
e820_init();
/* and tokenize the available memory into allocatable pages */
pagealloc_init();
/* With the page allocator in place, git rid of our temporary
* early-boot page tables and setup dynamic permanent ones */
vm_init();
/* MM basics done, enable dynamic heap memory to kernel code
* early on .. */
kmalloc_init();
/*
* Secondary-CPUs startup
*/
/* Discover our secondary-CPUs and system IRQs layout before
* initializing the local APICs */
mptables_init();
/* Remap and mask the PIC; it's just a disturbance */
serial_init();
pic_init();
/* Initialize the APICs (and map their MMIO regs) before enabling
* IRQs, and before firing other cores using Inter-CPU Interrupts */
apic_init();
ioapic_init();
/* SMP infrastructure ready, fire the CPUs! */
smpboot_init();
keyboard_init();
/* Startup finished, roll-in the scheduler! */
sched_init();
local_irq_enable();
/*
* Second part of kernel initialization (Scheduler is now on!)
*/
ext2_init();
// Signal the secondary cores to run their own test-cases code.
// They've been waiting for us (thread 0) till all of kernel
// subsystems has been properly initialized. Wait No More!
smpboot_trigger_secondary_cores_testcases();
run_test_cases();
halt();
}
int
main (int argc, char* argv[])
{
int fd, kernel_fd = -1;
/* scanning whether there's -h or --help in the options */
char c, *unit;
while ((c = getopt_long(argc, argv, ":skmdx:", longopts, 0)) != -1) {
switch (c) {
case 'h':
printf (" -d <path>, --disk=<path> specify normal disk\n"
" -k <path>, --kernel=<path> specify kernel file\n"
" -m NUM , --memsize=NUM specify memory size\n"
" -s <path>, --swap=<path> specify swap disk\n"
" -h, --help print this message and exit\n");
return 0;
break;
case 'k':
if ((kernel_fd = open (optarg, O_RDONLY)) < 0)
return 1;
break;
case 'm':
memsize = strtol (optarg, &unit, 10);
if (*unit == 'K' || *unit == 'k')
memsize <<= 10;
else if (*unit == 'M' || *unit == 'm')
memsize <<= 20;
break;
default:
/* ignore other options now */
break;
}
}
if (kernel_fd < 0) {
printf ("No kernel file specified.\n");
return 1;
}
struct stat buf;
fstat (kernel_fd, &buf);
fd = create_mem_file (memsize);
/* map the temp file & copy boot and kernel code to the memory */
int brk_end = (int)sbrk (0);
mmap ((void*)brk_end, memsize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED, fd, 0);
read_kernel (kernel_fd, brk_end - KERNBASE);
/* map the reserved part to where it really should be */
mmap ((void*)KERNBASE, RESERVED_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED, fd, 0);
/* Now we have access to ginfo normally. */
ginfo->mem_fd = fd;
e820_init (kernel_fd);
parse_opts (argc, argv);
/* unmap useless page table entries */
memcpy ((void*)(BOOT_CODE), (void*)&__boot_start, PGSIZE);
stk_init (brk_end, fd);
void (*boot_start) (void);
boot_start = __pa (__boot_entry);
boot_start ();
return 0;
}
