mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
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0d21680c35
Remove useless private structure in function prototypes. Add a reference counter on clocks. Prepare for future secured/shared/non-secured clocks. Change-Id: I3dbed81721da5ceff5e10b2c4155b1e340c036ee Signed-off-by: Yann Gautier <yann.gautier@st.com> Signed-off-by: Etienne Carriere <etienne.carriere@st.com> Signed-off-by: Lionel Debieve <lionel.debieve@st.com> Signed-off-by: Nicolas LE BAYON <nicolas.le.bayon@st.com>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* Copyright (C) 2018-2019, STMicroelectronics - All Rights Reserved
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef STM32MP_SHRES_HELPERS_H
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#define STM32MP_SHRES_HELPERS_H
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#include <stdint.h>
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#include <common/debug.h>
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/*
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* Shared reference counter: increments by 2 on secure increment
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* request, decrements by 2 on secure decrement request. Bit #0
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* is set to 1 on non-secure increment request and reset to 0 on
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* non-secure decrement request. The counter initializes to
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* either 0, 1 or 2 upon their expect default state.
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* Counters saturates once above UINT_MAX / 2.
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*/
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#define SHREFCNT_NONSECURE_FLAG 0x1UL
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#define SHREFCNT_SECURE_STEP 0x2UL
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#define SHREFCNT_MAX (UINT32_MAX / 2)
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/* Return 1 if refcnt increments from 0, else return 0 */
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static inline int stm32mp_incr_shrefcnt(unsigned int *refcnt, bool secure)
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{
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int rc = !*refcnt;
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if (secure) {
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*refcnt += SHREFCNT_SECURE_STEP;
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if (*refcnt >= SHREFCNT_MAX) {
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panic();
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}
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} else {
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*refcnt |= SHREFCNT_NONSECURE_FLAG;
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}
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return rc;
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}
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/* Return 1 if refcnt decrements to 0, else return 0 */
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static inline int stm32mp_decr_shrefcnt(unsigned int *refcnt, bool secure)
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{
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int rc = 0;
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if (secure) {
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if (*refcnt < SHREFCNT_MAX) {
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if (*refcnt < SHREFCNT_SECURE_STEP) {
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panic();
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}
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*refcnt -= SHREFCNT_SECURE_STEP;
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rc = !*refcnt;
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}
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} else {
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rc = (*refcnt == SHREFCNT_NONSECURE_FLAG) ? 1 : 0;
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*refcnt &= ~SHREFCNT_NONSECURE_FLAG;
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}
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return rc;
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}
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static inline int stm32mp_incr_refcnt(unsigned int *refcnt)
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{
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return stm32mp_incr_shrefcnt(refcnt, true);
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}
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static inline int stm32mp_decr_refcnt(unsigned int *refcnt)
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{
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return stm32mp_decr_shrefcnt(refcnt, true);
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}
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#endif /* STM32MP_SHRES_HELPERS_H */
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