cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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trusted_foundations.h (2500B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright (c) 2013, NVIDIA Corporation.
      4 */
      5
      6/*
      7 * Support for the Trusted Foundations secure monitor.
      8 *
      9 * Trusted Foundation comes active on some ARM consumer devices (most
     10 * Tegra-based devices sold on the market are concerned). Such devices can only
     11 * perform some basic operations, like setting the CPU reset vector, through
     12 * SMC calls to the secure monitor. The calls are completely specific to
     13 * Trusted Foundations, and do *not* follow the SMC calling convention or the
     14 * PSCI standard.
     15 */
     16
     17#ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
     18#define __FIRMWARE_TRUSTED_FOUNDATIONS_H
     19
     20#include <linux/printk.h>
     21#include <linux/bug.h>
     22#include <linux/of.h>
     23#include <linux/cpu.h>
     24#include <linux/smp.h>
     25#include <linux/types.h>
     26
     27#include <asm/hardware/cache-l2x0.h>
     28#include <asm/outercache.h>
     29
     30#define TF_PM_MODE_LP0			0
     31#define TF_PM_MODE_LP1			1
     32#define TF_PM_MODE_LP1_NO_MC_CLK	2
     33#define TF_PM_MODE_LP2			3
     34#define TF_PM_MODE_LP2_NOFLUSH_L2	4
     35#define TF_PM_MODE_NONE			5
     36
     37struct trusted_foundations_platform_data {
     38	unsigned int version_major;
     39	unsigned int version_minor;
     40};
     41
     42#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
     43
     44void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
     45void of_register_trusted_foundations(void);
     46bool trusted_foundations_registered(void);
     47
     48#else /* CONFIG_TRUSTED_FOUNDATIONS */
     49static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
     50{
     51}
     52
     53static inline void register_trusted_foundations(
     54				   struct trusted_foundations_platform_data *pd)
     55{
     56	/*
     57	 * If the system requires TF and we cannot provide it, continue booting
     58	 * but disable features that cannot be provided.
     59	 */
     60	pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
     61	pr_err("Secondary processors as well as CPU PM will be disabled.\n");
     62#if IS_ENABLED(CONFIG_CACHE_L2X0)
     63	pr_err("L2X0 cache will be kept disabled.\n");
     64	outer_cache.write_sec = tf_dummy_write_sec;
     65#endif
     66#if IS_ENABLED(CONFIG_SMP)
     67	setup_max_cpus = 0;
     68#endif
     69	cpu_idle_poll_ctrl(true);
     70}
     71
     72static inline void of_register_trusted_foundations(void)
     73{
     74	/*
     75	 * If we find the target should enable TF but does not support it,
     76	 * fail as the system won't be able to do much anyway
     77	 */
     78	if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
     79		register_trusted_foundations(NULL);
     80}
     81
     82static inline bool trusted_foundations_registered(void)
     83{
     84	return false;
     85}
     86#endif /* CONFIG_TRUSTED_FOUNDATIONS */
     87
     88#endif