int_irqmp_init.c
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/*
* Copyright (c) 2017, Cobham Gaisler AB
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bcc/bsp.h>
#include "bcc/ambapp.h"
#include "int_irqmp_priv.h"
static void findplic(void)
{
if (__BSP_PLIC_HANDLE) {
return;
}
if (__bcc_plic_handle) {
return;
}
struct amba_ahb_info ahbi;
uintptr_t regs;
regs = ambapp_visit(
__bcc_ioarea,
VENDOR_GAISLER,
GAISLER_GRPLIC,
AMBAPP_VISIT_AHBSLAVE,
4,
ambapp_findfirst_fn,
&ahbi
);
__bcc_plic_handle = regs;
}
static void findclint(void)
{
if (__BSP_CLINT_HANDLE) {
return;
}
if (__bcc_clint_handle) {
return;
}
struct amba_ahb_info ahbi;
uintptr_t regs;
regs = ambapp_visit(
__bcc_ioarea,
VENDOR_GAISLER,
GAISLER_CLINT,
AMBAPP_VISIT_AHBSLAVE,
4,
ambapp_findfirst_fn,
&ahbi
);
__bcc_clint_handle = regs;
}
#ifndef UNUSED
#define UNUSED(v) ((void) sizeof (v))
#endif
/* count number of NOEL-V processor by plug&play scanning */
static uint32_t fncpu(
void *info,
uint32_t vendor,
uint32_t device,
uint32_t type,
uint32_t depth,
void *arg
)
{
UNUSED(vendor); UNUSED(device); UNUSED(type); UNUSED(depth);
UNUSED(info); UNUSED(arg);
__bcc_cpu_count++;
return 0;
}
int __bcc_int_init(void)
{
/* The CPU counting can be disabled by assigning in __bcc_init60() */
if (__bcc_cpu_count == 0) {
ambapp_visit(
__bcc_ioarea,
VENDOR_GAISLER,
GAISLER_RV64GC,
AMBAPP_VISIT_AHBMASTER,
4,
fncpu,
NULL
);
if (__bcc_cpu_count == 0) {
__bcc_cpu_count = 1;
}
}
findplic();
findclint();
volatile struct plic_regs *plic = (void *) __bcc_plic_handle;
plic->context[__bcc_cpuid * 4].priority_threshold = 0;
for (int i = 1; i < 32; i++) {
plic->priority[i] = 1;
}
__asm__ volatile ( "csrrs zero, mie, %0" : : "r" (1<<11) );
bcc_int_enable(RISCV_MSTATUS_MIE);
return BCC_OK;
}