101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
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*/
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#include <arch/cache.h>
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#include <arch/spintable.h>
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#include <arch/transition.h>
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#include <console/console.h>
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#include <cpu/cpu.h>
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#include <cbmem.h>
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#include <string.h>
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static struct spintable_attributes spin_attrs;
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void spintable_init(void *monitor_address)
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{
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extern void __wait_for_spin_table_request(void);
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const size_t code_size = 4096;
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if (monitor_address == NULL) {
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printk(BIOS_ERR, "spintable: NULL address to monitor.\n");
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return;
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}
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spin_attrs.entry = cbmem_add(CBMEM_ID_SPINTABLE, code_size);
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if (spin_attrs.entry == NULL)
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return;
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spin_attrs.addr = monitor_address;
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printk(BIOS_INFO, "spintable @ %p will monitor %p\n",
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spin_attrs.entry, spin_attrs.addr);
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/* Ensure the memory location is zero'd out. */
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*(uint64_t *)monitor_address = 0;
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memcpy(spin_attrs.entry, __wait_for_spin_table_request, code_size);
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dcache_clean_invalidate_by_mva(monitor_address, sizeof(uint64_t));
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dcache_clean_invalidate_by_mva(spin_attrs.entry, code_size);
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}
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static void spintable_enter(void *unused)
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{
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struct exc_state state;
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const struct spintable_attributes *attrs;
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int current_el;
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attrs = spintable_get_attributes();
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current_el = get_current_el();
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if (current_el != EL3)
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attrs->entry(attrs->addr);
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memset(&state, 0, sizeof(state));
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state.elx.spsr = get_eret_el(EL2, SPSR_USE_L);
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transition_with_entry(attrs->entry, attrs->addr, &state);
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}
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const struct spintable_attributes *spintable_get_attributes(void)
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{
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if (spin_attrs.entry == NULL) {
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printk(BIOS_ERR, "spintable: monitor code not present.\n");
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return NULL;
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}
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return &spin_attrs;
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}
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void spintable_start(void)
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{
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struct cpu_action action = {
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.run = spintable_enter,
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};
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if (spintable_get_attributes() == NULL)
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return;
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printk(BIOS_INFO, "All non-boot CPUs to enter spintable.\n");
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arch_run_on_all_cpus_but_self_async(&action);
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}
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