arch/arm/mach-omap2/omap-secure.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/omap-secure.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/omap-secure.c
Extension
.c
Size
6076 bytes
Lines
257
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP Secure API infrastructure.
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 *	Santosh Shilimkar <santosh.shilimkar@ti.com>
 * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
 * Copyright (C) 2013 Pali Rohár <pali@kernel.org>
 */

#include <linux/arm-smccc.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of.h>

#include <asm/cacheflush.h>
#include <asm/memblock.h>

#include "common.h"
#include "omap-secure.h"
#include "soc.h"

static phys_addr_t omap_secure_memblock_base;

bool optee_available;

#define OMAP_SIP_SMC_STD_CALL_VAL(func_num) \
	ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
	ARM_SMCCC_OWNER_SIP, (func_num))

static void __init omap_optee_init_check(void)
{
	struct device_node *np;

	/*
	 * We only check that the OP-TEE node is present and available. The
	 * OP-TEE kernel driver is not needed for the type of interaction made
	 * with OP-TEE here so the driver's status is not checked.
	 */
	np = of_find_node_by_path("/firmware/optee");
	if (np && of_device_is_available(np))
		optee_available = true;
	of_node_put(np);
}

/**
 * omap_secure_dispatcher - Routine to dispatch low power secure
 * service routines
 * @idx: The HAL API index
 * @flag: The flag indicating criticality of operation
 * @nargs: Number of valid arguments out of four.
 * @arg1, arg2, arg3 args4: Parameters passed to secure API
 *
 * Return the non-zero error value on failure.
 */
u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
							 u32 arg3, u32 arg4)
{
	static u32 buf[NR_CPUS][5];
	u32 *param;
	int cpu;
	u32 ret;

	cpu = get_cpu();
	param = buf[cpu];

	param[0] = nargs;
	param[1] = arg1;
	param[2] = arg2;
	param[3] = arg3;
	param[4] = arg4;

	/*
	 * Secure API needs physical address
	 * pointer for the parameters
	 */
	flush_cache_all();
	outer_clean_range(__pa(param), __pa(param + 5));
	ret = omap_smc2(idx, flag, __pa(param));

	put_cpu();

	return ret;
}

void omap_smccc_smc(u32 fn, u32 arg)
{

Annotation

Implementation Notes