Hi, other time:
I'm trying to develop intel_startCPU function, using the function of this
file as base code
https://github.com/nneonneo/osx-10.9-opensource/blob/master/xnu-2422.1.72/osfmk/i386/mp.c
I've got to replace the *ml_set_interrupts_enabled() *calls, and now I need
to replace this call:* cpu_desc_init64(cpu_datap(slot_num));*
Reading the comments, this function do this:
*Initialize (or re-initialize) the descriptor tables for this cpu. *
Propagate processor mode to slave.*
But I won't be clear what is the Mach equivalent to this function.
I attach the current code
Can you help me?
2018-07-03 18:35 GMT+02:00 Luca Dariz <luca.da...@gmail.com>:
> Il 03/07/2018 18:15, Almudena Garcia ha scritto:
> > Using grep, I've found /local_bh_count/ and /local_irq_count. ffs /is
> > defined correctly.
> >
> > But I don't find the /intel_startCPU/ definition. In
> > /i386/i386/mp_desc.c /there are many calls to this, but It doesn't
> > appear to be in any file.
> >
> > Do you know about this?
>
> No. Note that the whole file results empty if NCPU == 1.. maybe it got
> lost when SMP was disabled, you could try to look for some old Mach
> version which supported SMP, or implement your own.
> For example you can look at the XNU kernel and see how it is implemented
> there.
>
> Luca
>
#include <kern/kmutex.h>
#include <kern/cpu_number.h>
#include <i386/gdt.h>
#include <i386/ldt.h>
#include <i386/i386/pcb.h>
#include <i386/i386/tss.h>
kern_return_t intel_startCPU(
int slot_num)
{
int lapic = cpu_to_lapic[slot_num];
int eFlagsRegister;
assert(lapic != -1);
DBGLOG_CPU_INIT(slot_num);
DBG("intel_startCPU(%d) lapic_id=%d\n", slot_num, lapic);
DBG("IdlePTD(%p): 0x%x\n", &IdlePTD, (int) (uintptr_t)IdlePTD);
/*
* Initialize (or re-initialize) the descriptor tables for this cpu.
* Propagate processor mode to slave.
*/
cpu_desc_init64(cpu_datap(slot_num));
/* Serialize use of the slave boot stack, etc. */
kmutex_lock(&mp_cpu_boot_lock);
/*istate = ml_set_interrupts_enabled(FALSE);*/
cpu_intr_save(&eFlagsRegister);
if (slot_num == cpu_number()) {
/*ml_set_interrupts_enabled(istate);*/
cpu_intr_save(&eFlagsRegister);
lck_mtx_unlock(&mp_cpu_boot_lock);
return KERN_SUCCESS;
}
start_info.starter_cpu = cpu_number();
start_info.target_cpu = slot_num;
start_info.target_lapic = lapic;
tsc_entry_barrier = 2;
tsc_exit_barrier = 2;
/*
* Perform the processor startup sequence with all running
* processors rendezvous'ed. This is required during periods when
* the cache-disable bit is set for MTRR/PAT initialization.
*/
mp_rendezvous_no_intrs(start_cpu, (void *) &start_info);
start_info.target_cpu = 0;
/*ml_set_interrupts_enabled(istate);*/
cpu_intr_restore(eFlagsRegister);
lck_mtx_unlock(&mp_cpu_boot_lock);
if (!cpu_datap(slot_num)->cpu_running) {
kprintf("Failed to start CPU %02d\n", slot_num);
printf("Failed to start CPU %02d, rebooting...\n", slot_num);
delay(1000000);
halt_cpu();
return KERN_SUCCESS;
} else {
kprintf("Started cpu %d (lapic id %08x)\n", slot_num, lapic);
return KERN_SUCCESS;
}
}
