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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <arch/cache.h>
#include <arch/spintable.h>
#include <arch/transition.h>
#include <console/console.h>
#include <cpu/cpu.h>
#include <cbmem.h>
#include <string.h>
static struct spintable_attributes spin_attrs;
void spintable_init(void *monitor_address)
{
extern void __wait_for_spin_table_request(void);
const size_t code_size = 4096;
if (monitor_address == NULL) {
printk(BIOS_ERR, "spintable: NULL address to monitor.\n");
return;
}
spin_attrs.entry = cbmem_add(CBMEM_ID_SPINTABLE, code_size);
if (spin_attrs.entry == NULL)
return;
spin_attrs.addr = monitor_address;
printk(BIOS_INFO, "spintable @ %p will monitor %p\n",
spin_attrs.entry, spin_attrs.addr);
/* Ensure the memory location is zero'd out. */
*(uint64_t *)monitor_address = 0;
memcpy(spin_attrs.entry, __wait_for_spin_table_request, code_size);
dcache_clean_invalidate_by_mva(monitor_address, sizeof(uint64_t));
dcache_clean_invalidate_by_mva(spin_attrs.entry, code_size);
}
static void spintable_enter(void *unused)
{
struct exc_state state;
const struct spintable_attributes *attrs;
int current_el;
attrs = spintable_get_attributes();
current_el = get_current_el();
if (current_el != EL3)
attrs->entry(attrs->addr);
memset(&state, 0, sizeof(state));
state.elx.spsr = get_eret_el(EL2, SPSR_USE_L);
transition_with_entry(attrs->entry, attrs->addr, &state);
}
const struct spintable_attributes *spintable_get_attributes(void)
{
if (spin_attrs.entry == NULL) {
printk(BIOS_ERR, "spintable: monitor code not present.\n");
return NULL;
}
return &spin_attrs;
}
void spintable_start(void)
{
struct cpu_action action = {
.run = spintable_enter,
};
if (spintable_get_attributes() == NULL)
return;
printk(BIOS_INFO, "All non-boot CPUs to enter spintable.\n");
arch_run_on_all_cpus_but_self_async(&action);
}
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