void start(uint32_t* modulep, void* physbase, void* physfree)
{
struct smap_t {
uint64_t base, length;
uint32_t type;
}__attribute__((packed)) *smap;
while(modulep[0] != 0x9001) modulep += modulep[1]+2;
physfree = init_pages(physfree);
for(smap = (struct smap_t*)(modulep+2); smap < (struct smap_t*)((char*)modulep+modulep[1]+2*4); ++smap) {
if (smap->type == 1 /* memory */ && smap->length != 0) {
printf("Available Physical Memory [%x-%x]\n", smap->base, smap->base + smap->length);
physfree = make_pages(smap->base, smap->length, physfree);
}
}
printf("KERNEL IN [%p:%p:%x]\n", physbase, physfree, &kernmem);
setup_paging(physbase, physfree, 0xb8000, 0xbb200, &kernmem);
printf("tarfs in [%p:%p]\n", &_binary_tarfs_start, &_binary_tarfs_end);
init_tarfs(&_binary_tarfs_start, &_binary_tarfs_end);
idts_setup();
PIC_setup();
process_init();
__asm__ volatile("sti");
init();
}
void kmain(void)
{
init_bss();
init_ro();
setup_kernel_memory();
setup_pages();
setup_ints();
setup_tss();
setup_paging();
setup_faults();
setup_fs();
setup_syscalls();
init_devs();
char vendor[12];
if (has_cpuid()) {
cpuid_string(0, vendor);
dprintf("CPU Vendor ID: %s\n");
}
fexec("/prgm/start", 0, NULL, NULL);
start_scheduler();
asm volatile ("sti");
asm volatile ("hlt");
/* We should never reach this */
assert(0);
}
main()
{
int t, d;
// reposition stack within first 16M
//LI即将imme（立即数）赋值给a寄存器，此处a=4M
asm(LI, 4*1024*1024);
//kernel sp指针指向a(4M)
asm(SSP);
setup_paging();
out(1,'1');
halt(0);
}
