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/*
* Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <acpi/acpi.h>
#include <os/trace.h>
#include <kern/panic.h>
#include <dev/clkdev/hpet.h>
#include <lib/string.h>
#include <md/lapic.h>
#include <mu/cpu.h>
#include <vm/vm.h>
#define dtrace(fmt, ...) trace("mp: " fmt, ##__VA_ARGS__)
/*
* The startup code is copied to the processor bring up area
* to which it is executed in real mode. This area must fit
* within a page and be no larger and no smaller.
*/
#define AP_BUA_LEN 0x1000 /* Bring up area length in bytes */
#define AP_BUA_PADDR 0x1000 /* Bring up area [physical] */
#define AP_BUA_VADDR PHYS_TO_VIRT(AP_BUA_PADDR) /* Bring up area [virtual] */
__section(".trampoline") static char ap_code[4096];
static int
cpu_lapic_cb(struct apic_header *h, size_t arg)
{
struct local_apic *lapic;
struct cpu_info *self;
struct mcb *mcb;
struct lapic_ipi ipi;
int error;
self = cpu_self();
if (self == NULL) {
panic("mp: could not get self\n");
}
mcb = &self->mcb;
/* Skip ourselves */
lapic = (struct local_apic *)h;
if (lapic->apic_id == arg) {
return -1;
}
/* If not online capable, continue */
if (!ISSET(lapic->flags, 0x3)) {
return -1;
}
/* Prepare the IPI packet */
ipi.dest_id = lapic->apic_id;
ipi.vector = 0;
ipi.delmod = IPI_DELMOD_INIT;
ipi.shorthand = IPI_SHAND_NONE;
ipi.logical_dest = 0;
error = lapic_send_ipi(mcb, &ipi);
if (error < 0) {
panic("mp: failed to send INIT IPI\n");
}
/* Give it 20ms then prep a STARTUP */
hpet_msleep(20);
ipi.delmod = IPI_DELMOD_STARTUP;
ipi.vector = (AP_BUA_PADDR >> 12);
/* The MPSpec says to send two */
for (uint8_t i = 0; i < 2; ++i) {
error = lapic_send_ipi(mcb, &ipi);
if (error != 0) {
panic("mp: failed to send STARTUP IPI\n");
}
hpet_msleep(2);
}
dtrace("bootstrapping lapic %d\n", lapic->apic_id);
return -1; /* Keep going */
}
void
cpu_start_aps(struct cpu_info *ci)
{
struct cpu_info *self;
struct mcb *mcb;
size_t bua_len;
uint8_t *bua;
if (ci == NULL) {
return;
}
self = cpu_self();
if (self == NULL) {
panic("mp: could not get current processor\n");
}
/* Copy the bring up code to the BUA */
bua = AP_BUA_VADDR;
memcpy(bua, ap_code, AP_BUA_LEN);
/* Start up the APs */
mcb = &self->mcb;
dtrace("bringing up application processors...\n");
acpi_read_madt(
APIC_TYPE_LOCAL_APIC,
cpu_lapic_cb,
lapic_read_id(mcb)
);
}
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