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Better support for PICO_DISABLE_SHARED_IRQ_HANDLERS (#496)

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* use PICO_DISABLE_SHARED_IRQ_HANDLERS exclusively as config for no shared handler support (rather than also PICO_MAX_SHARED_IRQ_HANDLERS == 0)
additionally make irq_add_shared_irq_handler() call irq_set_exclusive_handler() so that single usage of an IRQ still works

* Comment typo

Co-authored-by: Luke Wren <wren6991@gmail.com>
This commit is contained in:
Graham Sanderson 2021-06-29 11:55:35 -05:00 committed by GitHub
parent edcb65c916
commit cefe5c5b2a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 9 deletions
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21
src/rp2_common/hardware_irq/irq.c
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@ -63,7 +63,7 @@ void irq_set_pending(uint num) {
*((io_rw_32 *) (PPB_BASE + M0PLUS_NVIC_ISPR_OFFSET)) = 1u << num;
}
#if PICO_MAX_SHARED_IRQ_HANDLERS
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS
// limited by 8 bit relative links (and reality)
static_assert(PICO_MAX_SHARED_IRQ_HANDLERS >= 1 && PICO_MAX_SHARED_IRQ_HANDLERS < 0x7f, "");
@ -92,11 +92,13 @@ extern struct irq_handler_chain_slot {
} irq_handler_chain_slots[PICO_MAX_SHARED_IRQ_HANDLERS];
static int8_t irq_hander_chain_free_slot_head;
#endif
static inline bool is_shared_irq_raw_handler(irq_handler_t raw_handler) {
return (uintptr_t)raw_handler - (uintptr_t)irq_handler_chain_slots < sizeof(irq_handler_chain_slots);
}
#else
#define is_shared_irq_raw_handler(h) false
#endif
irq_handler_t irq_get_vtable_handler(uint num) {
check_irq_param(num);
@ -133,6 +135,7 @@ irq_handler_t irq_get_exclusive_handler(uint num) {
}
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS
static uint16_t make_branch(uint16_t *from, void *to) {
uint32_t ui_from = (uint32_t)from;
uint32_t ui_to = (uint32_t)to;
@ -179,18 +182,18 @@ static inline int8_t slot_diff(struct irq_handler_chain_slot *to, struct irq_han
static inline int8_t get_slot_index(struct irq_handler_chain_slot *slot) {
return slot_diff(slot, irq_handler_chain_slots);
}
#endif
void irq_add_shared_handler(uint num, irq_handler_t handler, uint8_t order_priority) {
check_irq_param(num);
#if PICO_DISABLE_SHARED_IRQ_HANDLERS
#endif
#if PICO_NO_RAM_VECTOR_TABLE || !PICO_MAX_SHARED_IRQ_HANDLERS
#if PICO_NO_RAM_VECTOR_TABLE
panic_unsupported()
#elif PICO_DISABLE_SHARED_IRQ_HANDLERS
irq_set_exclusive_handler(num, handler);
#else
spin_lock_t *lock = spin_lock_instance(PICO_SPINLOCK_ID_IRQ);
uint32_t save = spin_lock_blocking(lock);
hard_assert(irq_hander_chain_free_slot_head >= 0);
hard_assert(irq_hander_chain_free_slot_head >= 0); // we must have a slot
struct irq_handler_chain_slot *slot = &irq_handler_chain_slots[irq_hander_chain_free_slot_head];
int8_t slot_index = irq_hander_chain_free_slot_head;
irq_hander_chain_free_slot_head = slot->link;
@ -261,7 +264,7 @@ void irq_remove_handler(uint num, irq_handler_t handler) {
uint32_t save = spin_lock_blocking(lock);
irq_handler_t vtable_handler = get_vtable()[16 + num];
if (vtable_handler != __unhandled_user_irq && vtable_handler != handler) {
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS && PICO_MAX_SHARED_IRQ_HANDLERS
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS
if (is_shared_irq_raw_handler(vtable_handler)) {
// This is a bit tricky, as an executing IRQ handler doesn't take a lock.
@ -361,7 +364,7 @@ void irq_set_priority(uint num, uint8_t hardware_priority) {
*p = (*p & ~(0xffu << (8 * (num & 3u)))) | (((uint32_t) hardware_priority) << (8 * (num & 3u)));
}
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS && PICO_MAX_SHARED_IRQ_HANDLERS
#if !PICO_DISABLE_SHARED_IRQ_HANDLERS
// used by irq_handler_chain.S to remove the last link in a handler chain after it executes
// note this must be called only with the last slot in a chain (and during the exception)
void irq_add_tail_to_free_list(struct irq_handler_chain_slot *slot) {