/*
* Create a CPU structure. This is used for the bootup CPU and
* also for secondary CPUs.
*
* The hardware number (the number assigned by firmware or system
* board config or whatnot) is tracked separately because it is not
* necessarily anything sane or meaningful.
*/
struct cpu *
cpu_create(unsigned hardware_number)
{
struct cpu *c;
int result;
char namebuf[16];
c = kmalloc(sizeof(*c));
if (c == NULL) {
panic("cpu_create: Out of memory\n");
}
c->c_self = c;
c->c_hardware_number = hardware_number;
c->c_curthread = NULL;
threadlist_init(&c->c_zombies);
c->c_hardclocks = 0;
c->c_spinlocks = 0;
c->c_isidle = false;
threadlist_init(&c->c_runqueue);
spinlock_init(&c->c_runqueue_lock);
c->c_ipi_pending = 0;
c->c_numshootdown = 0;
spinlock_init(&c->c_ipi_lock);
result = cpuarray_add(&allcpus, c, &c->c_number);
if (result != 0) {
panic("cpu_create: array_add: %s\n", strerror(result));
}
snprintf(namebuf, sizeof(namebuf), "<boot #%d>", c->c_number);
c->c_curthread = thread_create(namebuf);
if (c->c_curthread == NULL) {
panic("cpu_create: thread_create failed\n");
}
result = proc_addthread(kproc, c->c_curthread);
if (result) {
panic("cpu_create: proc_addthread:: %s\n", strerror(result));
}
if (c->c_number == 0) {
/*
* Leave c->c_curthread->t_stack NULL for the boot
* cpu. This means we're using the boot stack, which
* can't be freed. (Exercise: what would it take to
* make it possible to free the boot stack?)
*/
/*c->c_curthread->t_stack = ... */
}
else {
c->c_curthread->t_stack = kmalloc(STACK_SIZE);
if (c->c_curthread->t_stack == NULL) {
panic("cpu_create: couldn't allocate stack");
}
thread_checkstack_init(c->c_curthread);
}
c->c_curthread->t_cpu = c;
cpu_machdep_init(c);
return c;
}
/*
* Create a CPU structure. This is used for the bootup CPU and
* also for secondary CPUs.
*
* The hardware number (the number assigned by firmware or system
* board config or whatnot) is tracked separately because it is not
* necessarily anything sane or meaningful.
*/
struct cpu *
cpu_create(unsigned hardware_number)
{
struct cpu *c;
int result;
char namebuf[16];
c = kmalloc(sizeof(*c));
if (c == NULL) {
panic("cpu_create: Out of memory\n");
}
c->c_self = c;
c->c_hardware_number = hardware_number;
c->c_curthread = NULL;
threadlist_init(&c->c_zombies);
c->c_hardclocks = 0;
c->c_spinlocks = 0;
c->c_isidle = false;
threadlist_init(&c->c_runqueue);
spinlock_init(&c->c_runqueue_lock);
c->c_ipi_pending = 0;
c->c_numshootdown = 0;
spinlock_init(&c->c_ipi_lock);
result = cpuarray_add(&allcpus, c, &c->c_number);
if (result != 0) {
panic("cpu_create: array_add: %s\n", strerror(result));
}
snprintf(namebuf, sizeof(namebuf), "<boot #%d>", c->c_number);
c->c_curthread = thread_create(namebuf);
if (c->c_curthread == NULL) {
panic("cpu_create: thread_create failed\n");
}
c->c_curthread->t_cpu = c;
if (c->c_number == 0) {
/*
* Leave c->c_curthread->t_stack NULL for the boot
* cpu. This means we're using the boot stack, which
* can't be freed. (Exercise: what would it take to
* make it possible to free the boot stack?)
*/
/*c->c_curthread->t_stack = ... */
}
else {
c->c_curthread->t_stack = kmalloc(STACK_SIZE);
if (c->c_curthread->t_stack == NULL) {
panic("cpu_create: couldn't allocate stack");
}
thread_checkstack_init(c->c_curthread);
}
/*
* If there is no curcpu (or curthread) yet, we are creating
* the first (boot) cpu. Initialize curcpu and curthread as
* early as possible so that other code can take locks without
* exploding.
*/
if (!CURCPU_EXISTS()) {
/*
* Initializing curcpu and curthread is
* machine-dependent because either of curcpu and
* curthread might be defined in terms of the other.
*/
INIT_CURCPU(c, c->c_curthread);
/*
* Now make sure both t_cpu and c_curthread are
* set. This might be partially redundant with
* INIT_CURCPU depending on how things are defined.
*/
curthread->t_cpu = curcpu;
curcpu->c_curthread = curthread;
}
result = proc_addthread(kproc, c->c_curthread);
if (result) {
panic("cpu_create: proc_addthread:: %s\n", strerror(result));
}
cpu_machdep_init(c);
return c;
}
