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/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __EHF_H__
#define __EHF_H__
#ifndef __ASSEMBLY__
#include <stdint.h>
#include <utils_def.h>
/* Valid priorities set bit 0 of the priority handler. */
#define _EHF_PRI_VALID (((uintptr_t) 1) << 0)
/* Marker for no handler registered for a valid priority */
#define _EHF_NO_HANDLER (0 | _EHF_PRI_VALID)
/* Extract the specified number of top bits from 7 lower bits of priority */
#define EHF_PRI_TO_IDX(pri, plat_bits) \
((pri & 0x7f) >> (7 - plat_bits))
/* Install exception priority descriptor at a suitable index */
#define EHF_PRI_DESC(plat_bits, priority) \
[EHF_PRI_TO_IDX(priority, plat_bits)] = { \
.ehf_handler = _EHF_NO_HANDLER, \
}
/* Macro for platforms to regiter its exception priorities */
#define EHF_REGISTER_PRIORITIES(priorities, num, bits) \
const ehf_priorities_t exception_data = { \
.num_priorities = num, \
.ehf_priorities = priorities, \
.pri_bits = bits, \
}
/*
* Priority stack, managed as a bitmap.
*
* Currently only supports 32 priority levels, allowing platforms to use up to 5
* top bits of priority. But the type can be changed to uint64_t should need
* arise to support 64 priority levels, allowing platforms to use up to 6 top
* bits of priority.
*/
typedef uint32_t ehf_pri_bits_t;
/*
* Per-PE exception data. The data for each PE is kept as a per-CPU data field.
* See cpu_data.h.
*/
typedef struct {
ehf_pri_bits_t active_pri_bits;
/* Priority mask value before any priority levels were active */
uint8_t init_pri_mask;
/* Non-secure priority mask value stashed during Secure execution */
uint8_t ns_pri_mask;
} __aligned(sizeof(uint64_t)) pe_exc_data_t;
typedef int (*ehf_handler_t)(uint32_t intr_raw, uint32_t flags, void *handle,
void *cookie);
typedef struct ehf_pri_desc {
/*
* 4-byte-aligned exception handler. Bit 0 indicates the corresponding
* priority level is valid. This is effectively of ehf_handler_t type,
* but left as uintptr_t in order to make pointer arithmetic convenient.
*/
uintptr_t ehf_handler;
} ehf_pri_desc_t;
typedef struct ehf_priorities {
ehf_pri_desc_t *ehf_priorities;
unsigned int num_priorities;
int pri_bits;
} ehf_priorities_t;
void ehf_init(void);
void ehf_activate_priority(unsigned int priority);
void ehf_deactivate_priority(unsigned int priority);
void ehf_register_priority_handler(unsigned int pri, ehf_handler_t handler);
void ehf_allow_ns_preemption(void);
unsigned int ehf_is_ns_preemption_allowed(void);
#endif /* __ASSEMBLY__ */
#endif /* __EHF_H__ */