128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
// See LICENSE for license details.
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#include "sifive/devices/plic.h"
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#include "plic/plic_driver.h"
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#include "platform.h"
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#include "encoding.h"
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#include <string.h>
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// Note that there are no assertions or bounds checking on these
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// parameter values.
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void volatile_memzero(uint8_t * base, unsigned int size)
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{
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volatile uint8_t * ptr;
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for (ptr = base; ptr < (base + size); ptr++){
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*ptr = 0;
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}
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}
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void PLIC_init (
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plic_instance_t * this_plic,
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uintptr_t base_addr,
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uint32_t num_sources,
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uint32_t num_priorities
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)
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{
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this_plic->base_addr = base_addr;
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this_plic->num_sources = num_sources;
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this_plic->num_priorities = num_priorities;
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// Disable all interrupts (don't assume that these registers are reset).
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unsigned long hart_id = read_csr(mhartid);
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volatile_memzero((uint8_t*) (this_plic->base_addr +
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PLIC_ENABLE_OFFSET +
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(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET)),
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(num_sources + 8) / 8);
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// Set all priorities to 0 (equal priority -- don't assume that these are reset).
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volatile_memzero ((uint8_t *)(this_plic->base_addr +
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PLIC_PRIORITY_OFFSET),
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(num_sources + 1) << PLIC_PRIORITY_SHIFT_PER_SOURCE);
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// Set the threshold to 0.
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volatile plic_threshold* threshold = (plic_threshold*)
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(this_plic->base_addr +
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PLIC_THRESHOLD_OFFSET +
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(hart_id << PLIC_THRESHOLD_SHIFT_PER_TARGET));
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*threshold = 0;
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}
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void PLIC_set_threshold (plic_instance_t * this_plic,
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plic_threshold threshold){
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unsigned long hart_id = read_csr(mhartid);
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volatile plic_threshold* threshold_ptr = (plic_threshold*) (this_plic->base_addr +
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PLIC_THRESHOLD_OFFSET +
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(hart_id << PLIC_THRESHOLD_SHIFT_PER_TARGET));
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*threshold_ptr = threshold;
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}
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void PLIC_enable_interrupt (plic_instance_t * this_plic, plic_source source){
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unsigned long hart_id = read_csr(mhartid);
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volatile uint8_t * current_ptr = (volatile uint8_t *)(this_plic->base_addr +
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PLIC_ENABLE_OFFSET +
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(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
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(source >> 3));
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uint8_t current = *current_ptr;
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current = current | ( 1 << (source & 0x7));
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*current_ptr = current;
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}
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void PLIC_disable_interrupt (plic_instance_t * this_plic, plic_source source){
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unsigned long hart_id = read_csr(mhartid);
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volatile uint8_t * current_ptr = (volatile uint8_t *) (this_plic->base_addr +
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PLIC_ENABLE_OFFSET +
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(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
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(source >> 3));
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uint8_t current = *current_ptr;
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current = current & ~(( 1 << (source & 0x7)));
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*current_ptr = current;
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}
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void PLIC_set_priority (plic_instance_t * this_plic, plic_source source, plic_priority priority){
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if (this_plic->num_priorities > 0) {
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volatile plic_priority * priority_ptr = (volatile plic_priority *)
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(this_plic->base_addr +
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PLIC_PRIORITY_OFFSET +
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(source << PLIC_PRIORITY_SHIFT_PER_SOURCE));
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*priority_ptr = priority;
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}
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}
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plic_source PLIC_claim_interrupt(plic_instance_t * this_plic){
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unsigned long hart_id = read_csr(mhartid);
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volatile plic_source * claim_addr = (volatile plic_source * )
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(this_plic->base_addr +
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PLIC_CLAIM_OFFSET +
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(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
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return *claim_addr;
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}
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void PLIC_complete_interrupt(plic_instance_t * this_plic, plic_source source){
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unsigned long hart_id = read_csr(mhartid);
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volatile plic_source * claim_addr = (volatile plic_source *) (this_plic->base_addr +
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PLIC_CLAIM_OFFSET +
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(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
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*claim_addr = source;
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}
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