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228 lines
8.1 KiB
228 lines
8.1 KiB
/*
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* Copyright (c) 2014-2020, ARM Limited and Contributors. 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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#include <assert.h>
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#include <errno.h>
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#include <common/bl_common.h>
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#include <bl31/interrupt_mgmt.h>
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#include <lib/el3_runtime/context_mgmt.h>
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#include <plat/common/platform.h>
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/*******************************************************************************
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* Local structure and corresponding array to keep track of the state of the
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* registered interrupt handlers for each interrupt type.
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* The field descriptions are:
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*
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* 'scr_el3[2]' : Mapping of the routing model in the 'flags' field to the
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* value of the SCR_EL3.IRQ or FIQ bit for each security state.
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* There are two instances of this field corresponding to the
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* two security states.
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*
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* 'flags' : Bit[0], Routing model for this interrupt type when execution is
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* not in EL3 in the secure state. '1' implies that this
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* interrupt will be routed to EL3. '0' implies that this
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* interrupt will be routed to the current exception level.
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*
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* Bit[1], Routing model for this interrupt type when execution is
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* not in EL3 in the non-secure state. '1' implies that this
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* interrupt will be routed to EL3. '0' implies that this
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* interrupt will be routed to the current exception level.
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*
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* All other bits are reserved and SBZ.
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******************************************************************************/
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typedef struct intr_type_desc {
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interrupt_type_handler_t handler;
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u_register_t scr_el3[2];
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uint32_t flags;
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} intr_type_desc_t;
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static intr_type_desc_t intr_type_descs[MAX_INTR_TYPES];
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/*******************************************************************************
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* This function validates the interrupt type.
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******************************************************************************/
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static int32_t validate_interrupt_type(uint32_t type)
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{
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if ((type == INTR_TYPE_S_EL1) || (type == INTR_TYPE_NS) ||
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(type == INTR_TYPE_EL3))
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return 0;
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return -EINVAL;
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}
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/*******************************************************************************
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* This function validates the routing model for this type of interrupt
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******************************************************************************/
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static int32_t validate_routing_model(uint32_t type, uint32_t flags)
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{
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uint32_t rm_flags = (flags >> INTR_RM_FLAGS_SHIFT) & INTR_RM_FLAGS_MASK;
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if (type == INTR_TYPE_S_EL1)
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return validate_sel1_interrupt_rm(rm_flags);
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if (type == INTR_TYPE_NS)
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return validate_ns_interrupt_rm(rm_flags);
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if (type == INTR_TYPE_EL3)
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return validate_el3_interrupt_rm(rm_flags);
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return -EINVAL;
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}
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/*******************************************************************************
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* This function returns the cached copy of the SCR_EL3 which contains the
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* routing model (expressed through the IRQ and FIQ bits) for a security state
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* which was stored through a call to 'set_routing_model()' earlier.
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******************************************************************************/
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u_register_t get_scr_el3_from_routing_model(uint32_t security_state)
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{
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u_register_t scr_el3;
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assert(sec_state_is_valid(security_state));
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scr_el3 = intr_type_descs[INTR_TYPE_NS].scr_el3[security_state];
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scr_el3 |= intr_type_descs[INTR_TYPE_S_EL1].scr_el3[security_state];
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scr_el3 |= intr_type_descs[INTR_TYPE_EL3].scr_el3[security_state];
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return scr_el3;
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}
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/*******************************************************************************
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* This function uses the 'interrupt_type_flags' parameter to obtain the value
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* of the trap bit (IRQ/FIQ) in the SCR_EL3 for a security state for this
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* interrupt type. It uses it to update the SCR_EL3 in the cpu context and the
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* 'intr_type_desc' for that security state.
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******************************************************************************/
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static void set_scr_el3_from_rm(uint32_t type,
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uint32_t interrupt_type_flags,
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uint32_t security_state)
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{
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uint32_t flag, bit_pos;
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flag = get_interrupt_rm_flag(interrupt_type_flags, security_state);
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bit_pos = plat_interrupt_type_to_line(type, security_state);
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intr_type_descs[type].scr_el3[security_state] = (u_register_t)flag << bit_pos;
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/*
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* Update scr_el3 only if there is a context available. If not, it
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* will be updated later during context initialization which will obtain
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* the scr_el3 value to be used via get_scr_el3_from_routing_model()
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*/
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if (cm_get_context(security_state) != NULL)
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cm_write_scr_el3_bit(security_state, bit_pos, flag);
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}
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/*******************************************************************************
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* This function validates the routing model specified in the 'flags' and
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* updates internal data structures to reflect the new routing model. It also
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* updates the copy of SCR_EL3 for each security state with the new routing
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* model in the 'cpu_context' structure for this cpu.
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******************************************************************************/
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int32_t set_routing_model(uint32_t type, uint32_t flags)
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{
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int32_t rc;
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rc = validate_interrupt_type(type);
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if (rc != 0)
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return rc;
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rc = validate_routing_model(type, flags);
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if (rc != 0)
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return rc;
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/* Update the routing model in internal data structures */
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intr_type_descs[type].flags = flags;
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set_scr_el3_from_rm(type, flags, SECURE);
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set_scr_el3_from_rm(type, flags, NON_SECURE);
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return 0;
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}
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/******************************************************************************
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* This function disables the routing model of interrupt 'type' from the
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* specified 'security_state' on the local core. The disable is in effect
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* till the core powers down or till the next enable for that interrupt
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* type.
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*****************************************************************************/
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int disable_intr_rm_local(uint32_t type, uint32_t security_state)
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{
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uint32_t bit_pos, flag;
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assert(intr_type_descs[type].handler != NULL);
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flag = get_interrupt_rm_flag(INTR_DEFAULT_RM, security_state);
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bit_pos = plat_interrupt_type_to_line(type, security_state);
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cm_write_scr_el3_bit(security_state, bit_pos, flag);
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return 0;
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}
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/******************************************************************************
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* This function enables the routing model of interrupt 'type' from the
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* specified 'security_state' on the local core.
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*****************************************************************************/
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int enable_intr_rm_local(uint32_t type, uint32_t security_state)
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{
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uint32_t bit_pos, flag;
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assert(intr_type_descs[type].handler != NULL);
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flag = get_interrupt_rm_flag(intr_type_descs[type].flags,
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security_state);
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bit_pos = plat_interrupt_type_to_line(type, security_state);
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cm_write_scr_el3_bit(security_state, bit_pos, flag);
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return 0;
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}
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/*******************************************************************************
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* This function registers a handler for the 'type' of interrupt specified. It
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* also validates the routing model specified in the 'flags' for this type of
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* interrupt.
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******************************************************************************/
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int32_t register_interrupt_type_handler(uint32_t type,
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interrupt_type_handler_t handler,
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uint32_t flags)
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{
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int32_t rc;
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/* Validate the 'handler' parameter */
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if (handler == NULL)
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return -EINVAL;
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/* Validate the 'flags' parameter */
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if ((flags & INTR_TYPE_FLAGS_MASK) != 0U)
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return -EINVAL;
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/* Check if a handler has already been registered */
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if (intr_type_descs[type].handler != NULL)
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return -EALREADY;
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rc = set_routing_model(type, flags);
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if (rc != 0)
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return rc;
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/* Save the handler */
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intr_type_descs[type].handler = handler;
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return 0;
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}
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/*******************************************************************************
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* This function is called when an interrupt is generated and returns the
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* handler for the interrupt type (if registered). It returns NULL if the
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* interrupt type is not supported or its handler has not been registered.
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******************************************************************************/
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interrupt_type_handler_t get_interrupt_type_handler(uint32_t type)
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{
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if (validate_interrupt_type(type) != 0)
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return NULL;
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return intr_type_descs[type].handler;
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}
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