121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
#include "sifive/devices/plic.h"
|
|
#include "plic_driver.h"
|
|
#include "platform.h"
|
|
#include "encoding.h"
|
|
#include <string.h>
|
|
|
|
void volatile_memzero(uint8_t * base, unsigned int size)
|
|
{
|
|
volatile uint8_t * ptr;
|
|
for (ptr = base; ptr < (base + size); ptr++){
|
|
*ptr = 0;
|
|
}
|
|
}
|
|
|
|
void PLIC_init (
|
|
plic_instance_t * this_plic,
|
|
uintptr_t base_addr,
|
|
uint32_t num_sources,
|
|
uint32_t num_priorities
|
|
)
|
|
{
|
|
|
|
this_plic->base_addr = base_addr;
|
|
this_plic->num_sources = num_sources;
|
|
this_plic->num_priorities = num_priorities;
|
|
|
|
// Disable all interrupts (don't assume that these registers are reset).
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
volatile_memzero((uint8_t*) (this_plic->base_addr +
|
|
PLIC_ENABLE_OFFSET +
|
|
(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET)),
|
|
(num_sources + 8) / 8);
|
|
|
|
// Set all priorities to 0 (equal priority -- don't assume that these are reset).
|
|
volatile_memzero ((uint8_t *)(this_plic->base_addr +
|
|
PLIC_PRIORITY_OFFSET),
|
|
(num_sources + 1) << PLIC_PRIORITY_SHIFT_PER_SOURCE);
|
|
|
|
// Set the threshold to 0.
|
|
volatile plic_threshold* threshold = (plic_threshold*)
|
|
(this_plic->base_addr +
|
|
PLIC_THRESHOLD_OFFSET +
|
|
(hart_id << PLIC_THRESHOLD_SHIFT_PER_TARGET));
|
|
|
|
*threshold = 0;
|
|
|
|
}
|
|
|
|
void PLIC_set_threshold (plic_instance_t * this_plic,
|
|
plic_threshold threshold){
|
|
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
volatile plic_threshold* threshold_ptr = (plic_threshold*) (this_plic->base_addr +
|
|
PLIC_THRESHOLD_OFFSET +
|
|
(hart_id << PLIC_THRESHOLD_SHIFT_PER_TARGET));
|
|
|
|
*threshold_ptr = threshold;
|
|
|
|
}
|
|
|
|
|
|
void PLIC_enable_interrupt (plic_instance_t * this_plic, plic_source source){
|
|
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
volatile uint8_t * current_ptr = (volatile uint8_t *)(this_plic->base_addr +
|
|
PLIC_ENABLE_OFFSET +
|
|
(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
|
|
(source >> 3));
|
|
uint8_t current = *current_ptr;
|
|
current = current | ( 1 << (source & 0x7));
|
|
*current_ptr = current;
|
|
|
|
}
|
|
|
|
void PLIC_disable_interrupt (plic_instance_t * this_plic, plic_source source){
|
|
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
volatile uint8_t * current_ptr = (volatile uint8_t *) (this_plic->base_addr +
|
|
PLIC_ENABLE_OFFSET +
|
|
(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
|
|
(source >> 3));
|
|
uint8_t current = *current_ptr;
|
|
current = current & ~(( 1 << (source & 0x7)));
|
|
*current_ptr = current;
|
|
|
|
}
|
|
|
|
void PLIC_set_priority (plic_instance_t * this_plic, plic_source source, plic_priority priority){
|
|
|
|
if (this_plic->num_priorities > 0) {
|
|
volatile plic_priority * priority_ptr = (volatile plic_priority *)
|
|
(this_plic->base_addr +
|
|
PLIC_PRIORITY_OFFSET +
|
|
(source << PLIC_PRIORITY_SHIFT_PER_SOURCE));
|
|
*priority_ptr = priority;
|
|
}
|
|
}
|
|
|
|
plic_source PLIC_claim_interrupt(plic_instance_t * this_plic){
|
|
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
|
|
volatile plic_source * claim_addr = (volatile plic_source * )
|
|
(this_plic->base_addr +
|
|
PLIC_CLAIM_OFFSET +
|
|
(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
|
|
|
|
return *claim_addr;
|
|
|
|
}
|
|
|
|
void PLIC_complete_interrupt(plic_instance_t * this_plic, plic_source source){
|
|
|
|
unsigned long hart_id = read_csr(mhartid);
|
|
volatile plic_source * claim_addr = (volatile plic_source *) (this_plic->base_addr +
|
|
PLIC_CLAIM_OFFSET +
|
|
(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
|
|
*claim_addr = source;
|
|
|
|
}
|