void __attribute__((noreturn)) kernel_main(unsigned int _memory_size)
{
struct vm_translation_map *init_map;
struct process *init_proc;
vm_page_init(_memory_size);
init_map = vm_translation_map_init();
boot_init_heap((char*) KERNEL_HEAP_BASE + PAGE_STRUCTURES_SIZE(_memory_size));
vm_address_space_init(init_map);
bootstrap_vm_cache();
bool_init_kernel_process();
boot_init_thread();
// Start other threads
REGISTERS[REG_THREAD_RESUME] = 0xffffffff;
spawn_kernel_thread("Grim Reaper", grim_reaper, 0);
init_proc = exec_program("program.elf");
// Idle task
for (;;)
{
if (list_is_empty(&init_proc->thread_list))
{
kprintf("init process has exited, shutting down\n");
REGISTERS[REG_THREAD_HALT] = 0xffffffff;
}
reschedule();
}
}
/* init virtual memory */
status_t vm_init(kernel_args_t *kargs)
{
addr_t heap_base; /* Kernel's heap base */
size_t heap_size; /* Kernel's heap size */
status_t err;
/* clear VM statistics */
memset(&VM_State, 0, sizeof(vm_stat_t));
/* translation map module init */
err = vm_translation_map_init(kargs);
if(err)
panic("vm_init: translation map init failed!\n");
/* execute architecture-specific init */
err = arch_vm_init(kargs);
if(err)
panic("arch_vm_init: failed!\n");
/* start platform-specific init */
err = platform_vm_init(kargs);
if(err)
panic("platform_vm_init: failed!\n");
/* init memory size */
err = vm_page_preinit(kargs);
if(err)
panic("vm_page_preinit: failed!\n");
/* init kernel's heap */
{
/* compute heap size */
heap_size = ROUNDUP(
vm_phys_mem_size() / SYSCFG_KERNEL_HEAP_FRAC,
1*1024*1024 /* Mbyte */
);
if(heap_size > SYSCFG_KERNEL_HEAP_MAX)
heap_size = SYSCFG_KERNEL_HEAP_MAX;
/* allocate heap area */
heap_base = vm_alloc_from_kargs(kargs, heap_size, VM_PROT_KERNEL_DEFAULT);
/* init heap */
heap_init(heap_base, heap_size);
/* Fuf... Now kmalloc and kfree is available */
}
/* init vm page module */
err = vm_page_init(kargs);
if(err)
panic("vm_page_init: failed!\n");
/*** Important note: After this point vm_alloc_from_kargs must not be used
*** because physical pages bookkeping is turned on.
***/
/* prefinal stage of translation map module init */
err = vm_translation_map_init_prefinal(kargs);
if(err)
panic("vm_init: prefinal stage of translation map init failed!\n");
/* start prefinal init stage of architecture-specific parts */
err = arch_vm_init_prefinal(kargs);
if(err)
panic("arch_vm_init_prefinal: stage failed!\n");
/* start prefinal stages of platform-specific init */
err = platform_vm_init_prefinal(kargs);
if(err)
panic("platform_vm_init_prefinal: stage failed!\n");
/* init address spaces module */
err = vm_address_spaces_init(kargs);
if(err)
panic("vm_address_spaces_init: failed!\n");
/* init vm objects module */
err = vm_objects_init(kargs);
if(err)
panic("vm_objects_init: failed!\n");
/* create initial kernel space */
if(vm_create_kernel_aspace("kernel_space", KERNEL_BASE, KERNEL_SIZE) == VM_INVALID_ASPACEID)
panic("vm_init: failed to create initial kernel space!\n");
/*** Final stages of VM init ***/
/* final stage of translation map module init */
err = vm_translation_map_init_final(kargs);
if(err)
panic("vm_init: final stage of translation map init failed!\n");
/* start final init stage of architecture-specific parts */
err = arch_vm_init_final(kargs);
if(err)
panic("arch_vm_init_final: final stage failed!\n");
/* final stages of platform-specific init */
err = platform_vm_init_final(kargs);
if(err)
panic("platform_vm_init_final: final stage failed!\n");
/* final stages of vm page module init */
err = vm_page_init_final(kargs);
if(err)
panic("vm_page_init_final: failed!\n");
/* init memory structures */
{
aspace_id kid = vm_get_kernel_aspace_id();
object_id id;
char name[SYS_MAX_OS_NAME_LEN];
int i;
/* create kernel_image memory object and its mapping */
id = vm_create_physmem_object(VM_NAME_KERNEL_IMAGE, kargs->phys_kernel_addr.start,
kargs->phys_kernel_addr.size, VM_OBJECT_PROTECT_ALL);
if(id == VM_INVALID_OBJECTID)
panic("vm_init: failed to create kernel_image object!\n");
err = vm_map_object_exactly(kid, id, VM_PROT_KERNEL_ALL, kargs->virt_kernel_addr.start);
if(err != NO_ERROR)
panic("vm_init: failed to create mapping of kernel_image object!\n");
/* init physical page counters */
err = vm_page_init_wire_counters(kargs->virt_kernel_addr.start,
kargs->virt_kernel_addr.size);
if(err != NO_ERROR)
panic("vm_init: failed to init counters for kernel_image object!\n");
/* create kernel stacks memory objects and mappings */
for(i = 0; i < SYSCFG_MAX_CPUS; i++) {
snprintf(name, SYS_MAX_OS_NAME_LEN, VM_NAME_KERNEL_CPU_STACK_FMT, i);
id = vm_create_physmem_object(name, kargs->phys_cpu_kstack[i].start,
kargs->phys_cpu_kstack[i].size, VM_OBJECT_PROTECT_ALL);
if(id == VM_INVALID_OBJECTID)
panic("vm_init: failed to create %s object!\n", name);
err = vm_map_object_exactly(kid, id, VM_PROT_KERNEL_ALL, kargs->virt_cpu_kstack[i].start);
if(err != NO_ERROR)
panic("vm_init: failed to create mapping of %s object!\n", name);
/* init counters */
err = vm_page_init_wire_counters(kargs->virt_cpu_kstack[i].start,
kargs->virt_cpu_kstack[i].size);
if(err != NO_ERROR)
panic("vm_init: failed to init counters for %s object!\n", name);
}
/* create kernel_heap memory object and its mapping */
id = vm_create_virtmem_object(VM_NAME_KERNEL_HEAP, kid, heap_base, heap_size,
VM_OBJECT_PROTECT_ALL);
if(id == VM_INVALID_OBJECTID)
panic("vm_init: failed to create kernel_heap object!\n");
err = vm_map_object_exactly(kid, id, VM_PROT_KERNEL_ALL, heap_base);
if(err != NO_ERROR)
panic("vm_init: failed to create mapping of kernel_heap object!\n");
/* init counters for heap pages */
err = vm_page_init_wire_counters(heap_base, heap_size);
if(err != NO_ERROR)
panic("vm_init: failed to init counters for kernel_heap object!\n");
/* create bootfs_image memory object */
id = vm_create_physmem_object(VM_NAME_BOOTFS_IMAGE, kargs->btfs_image_addr.start,
kargs->btfs_image_addr.size, VM_OBJECT_PROTECT_ALL);
if(id == VM_INVALID_OBJECTID)
panic("vm_init: failed to create bootfs_image object!\n");
}
/* end of init memory structures */
return NO_ERROR;
}