xref: /optee_os/core/include/kernel/tee_misc.h (revision fbe66cf83199aa6a2aca9f93384cf1ad9185a5f6)

/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (c) 2014, STMicroelectronics International N.V.
 */
#ifndef __KERNEL_TEE_MISC_H
#define __KERNEL_TEE_MISC_H

#include <types_ext.h>

/*
 * Macro to derive hex string buffer size from binary buffer size & the
 * reverse
 */
#define TEE_B2HS_HSBUF_SIZE(x) ((x) * 2 + 1)
#define TEE_HS2B_BBUF_SIZE(x) ((x + 1) >> 1)

/*
 * binary to hex string buffer
 * Returns the number of data bytes written to the hex string
 */
uint32_t tee_b2hs(uint8_t *b, uint8_t *hs, uint32_t blen, uint32_t hslen);

/*
 * hex string to binary buffer
 * Returns the number of data bytes written to the bin buffer
 */
uint32_t tee_hs2b(uint8_t *hs, uint8_t *b, uint32_t hslen, uint32_t blen);

/*
 * Is buffer 'b' inside/outside/overlapping area 'a'?
 *
 * core_is_buffer_inside() - return true if buffer is inside memory area
 * core_is_buffer_outside() - return true if buffer is outside area
 * core_is_buffer_intersect() - return true if buffer overlaps area
 *
 * Warning: core_is_buffer_inside(x,x,x,x)==false does NOT mean
 * core_is_buffer_outside(x,x,x,x)==true.
 *
 * Arguments use by each of these routines:
 * @b - buffer start address (handled has an unsigned offset)
 * @bl - length (in bytes) of the target buffer
 * @a - memory area start address (handled has an unsigned offset)
 * @al - memory area length (in byte)
 */
bool core_is_buffer_inside(paddr_t b, paddr_size_t bl,
			   paddr_t a, paddr_size_t al);
bool core_is_buffer_outside(paddr_t b, paddr_size_t bl,
			    paddr_t a, paddr_size_t al);
bool core_is_buffer_intersect(paddr_t b, paddr_size_t bl,
			      paddr_t a, paddr_size_t al);

/**
 * Allocate maximum cache line aligned memory buffer.
 *
 * Both size and base address of the memory buffer will be maximum cache line
 * aligned to make it safe to perform cache maintenance operations over the
 * allocated area.
 *
 * This is needed when non-cache coherent peripherals are used and memory area
 * is shared between CPU and peripheral.
 *
 * Allocated memory is zeroed.
 *
 * Release memory with free().
 *
 * @size   Size in bytes to allocate
 * @return NULL on failure or a pointer to allocated memory on success.
 */
void *alloc_cache_aligned(size_t size);

#endif /* __KERNEL_TEE_MISC_H */