mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
65a792e84f
Add the arch-specific code to support jump label for TILE-Gx. This code shares NOP instruction with ftrace, so we move it to a common header file. Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by: Zhigang Lu <zlu@ezchip.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
|
|
* Copyright 2015 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* jump label TILE-Gx support
|
|
*/
|
|
|
|
#include <linux/jump_label.h>
|
|
#include <linux/memory.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/cpu.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/insn.h>
|
|
|
|
#ifdef HAVE_JUMP_LABEL
|
|
|
|
static void __jump_label_transform(struct jump_entry *e,
|
|
enum jump_label_type type)
|
|
{
|
|
tilegx_bundle_bits opcode;
|
|
/* Operate on writable kernel text mapping. */
|
|
unsigned long pc_wr = ktext_writable_addr(e->code);
|
|
|
|
if (type == JUMP_LABEL_JMP)
|
|
opcode = tilegx_gen_branch(e->code, e->target, false);
|
|
else
|
|
opcode = NOP();
|
|
|
|
*(tilegx_bundle_bits *)pc_wr = opcode;
|
|
/* Make sure that above mem writes were issued towards the memory. */
|
|
smp_wmb();
|
|
}
|
|
|
|
void arch_jump_label_transform(struct jump_entry *e,
|
|
enum jump_label_type type)
|
|
{
|
|
get_online_cpus();
|
|
mutex_lock(&text_mutex);
|
|
|
|
__jump_label_transform(e, type);
|
|
flush_icache_range(e->code, e->code + sizeof(tilegx_bundle_bits));
|
|
|
|
mutex_unlock(&text_mutex);
|
|
put_online_cpus();
|
|
}
|
|
|
|
__init_or_module void arch_jump_label_transform_static(struct jump_entry *e,
|
|
enum jump_label_type type)
|
|
{
|
|
__jump_label_transform(e, type);
|
|
}
|
|
|
|
#endif /* HAVE_JUMP_LABEL */
|