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/*
* alternative runtime patching
* inspired by the x86 version
*
* Copyright (C) 2014 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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/>.
*/
#define pr_fmt(fmt) "alternatives: " fmt
#include <linux/init.h>
#include <linux/cpu.h>
#include <asm/cacheflush.h>
#include <asm/alternative.h>
#include <asm/cpufeature.h>
#include <linux/stop_machine.h>
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
struct alt_region {
struct alt_instr *begin;
struct alt_instr *end;
};
static int __apply_alternatives(void *alt_region)
{
struct alt_instr *alt;
struct alt_region *region = alt_region;
u8 *origptr, *replptr;
for (alt = region->begin; alt < region->end; alt++) {
if (!cpus_have_cap(alt->cpufeature))
continue;
BUG_ON(alt->alt_len > alt->orig_len);
pr_info_once("patching kernel code\n");
origptr = (u8 *)&alt->orig_offset + alt->orig_offset;
replptr = (u8 *)&alt->alt_offset + alt->alt_offset;
memcpy(origptr, replptr, alt->alt_len);
flush_icache_range((uintptr_t)origptr,
(uintptr_t)(origptr + alt->alt_len));
}
return 0;
}
void apply_alternatives_all(void)
{
struct alt_region region = {
.begin = __alt_instructions,
.end = __alt_instructions_end,
};
/* better not try code patching on a live SMP system */
stop_machine(__apply_alternatives, ®ion, NULL);
}
void apply_alternatives(void *start, size_t length)
{
struct alt_region region = {
.begin = start,
.end = start + length,
};
__apply_alternatives(®ion);
}
void free_alternatives_memory(void)
{
free_reserved_area(__alt_instructions, __alt_instructions_end,
0, "alternatives");
}
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