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/*
* Copyright (c) 2014-2017 Richard Braun.
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <kern/init.h>
#include <kern/log.h>
#include <kern/macros.h>
#include <kern/panic.h>
#include <kern/percpu.h>
#include <machine/cpu.h>
#include <vm/vm_kmem.h>
#include <vm/vm_page.h>
void *percpu_areas[CONFIG_MAX_CPUS] __read_mostly;
static void *percpu_area_content __initdata;
static size_t percpu_area_size __initdata;
static int percpu_skip_warning __initdata;
static int __init
percpu_bootstrap(void)
{
percpu_areas[0] = &_percpu;
return 0;
}
INIT_OP_DEFINE(percpu_bootstrap);
static int __init
percpu_setup(void)
{
struct vm_page *page;
unsigned int order;
percpu_area_size = &_percpu_end - &_percpu;
log_info("percpu: max_cpus: %u, section size: %zuk", CONFIG_MAX_CPUS,
percpu_area_size >> 10);
assert(vm_page_aligned(percpu_area_size));
if (percpu_area_size == 0) {
return 0;
}
order = vm_page_order(percpu_area_size);
page = vm_page_alloc(order, VM_PAGE_SEL_DIRECTMAP, VM_PAGE_KERNEL);
if (page == NULL) {
panic("percpu: unable to allocate memory for percpu area content");
}
percpu_area_content = vm_page_direct_ptr(page);
memcpy(percpu_area_content, &_percpu, percpu_area_size);
return 0;
}
INIT_OP_DEFINE(percpu_setup,
INIT_OP_DEP(percpu_bootstrap, true),
INIT_OP_DEP(vm_page_setup, true));
int __init
percpu_add(unsigned int cpu)
{
struct vm_page *page;
unsigned int order;
if (cpu >= ARRAY_SIZE(percpu_areas)) {
if (!percpu_skip_warning) {
log_warning("percpu: ignoring processor beyond id %zu",
ARRAY_SIZE(percpu_areas) - 1);
percpu_skip_warning = 1;
}
return EINVAL;
}
if (percpu_areas[cpu] != NULL) {
log_err("percpu: id %u ignored, already registered", cpu);
return EINVAL;
}
if (percpu_area_size == 0) {
goto out;
}
order = vm_page_order(percpu_area_size);
page = vm_page_alloc(order, VM_PAGE_SEL_DIRECTMAP, VM_PAGE_KERNEL);
if (page == NULL) {
log_err("percpu: unable to allocate percpu area");
return ENOMEM;
}
percpu_areas[cpu] = vm_page_direct_ptr(page);
memcpy(percpu_area(cpu), percpu_area_content, percpu_area_size);
out:
return 0;
}
static int __init
percpu_cleanup(void)
{
struct vm_page *page;
uintptr_t va;
va = (uintptr_t)percpu_area_content;
page = vm_page_lookup(vm_page_direct_pa(va));
vm_page_free(page, vm_page_order(percpu_area_size));
return 0;
}
INIT_OP_DEFINE(percpu_cleanup,
INIT_OP_DEP(cpu_mp_probe, true),
INIT_OP_DEP(percpu_setup, true),
INIT_OP_DEP(vm_page_setup, true));
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