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/*
* Copyright (c) 2013, The Regents of the University of California (Regents).
* 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.
* 3. Neither the name of the Regents nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
* OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
* HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <spike_util.h>
#include <arch/errno.h>
#include <atomic.h>
#include <string.h>
#include <console/console.h>
uintptr_t translate_address(uintptr_t vAddr) {
// TODO: implement the page table translation algorithm
//uintptr_t pageTableRoot = read_csr(sptbr);
uintptr_t physAddrMask = 0xfffffff;
uintptr_t translationResult = vAddr & physAddrMask;
printk(BIOS_DEBUG, "Translated virtual address 0x%llx to physical address 0x%llx\n", vAddr, translationResult);
return translationResult;
}
uintptr_t mcall_query_memory(uintptr_t id, memory_block_info *p)
{
uintptr_t physicalAddr = translate_address((uintptr_t) p);
memory_block_info *info = (memory_block_info*) physicalAddr;
if (id == 0) {
info->base = 0x1000000; // hard coded for now, but we can put these values somewhere later
info->size = 0x7F000000 - info->base;
return 0;
}
return -1;
}
uintptr_t mcall_send_ipi(uintptr_t recipient)
{
//if (recipient >= num_harts)
//return -1;
if (atomic_swap(&OTHER_HLS(recipient)->ipi_pending, 1) == 0) {
mb();
write_csr(send_ipi, recipient);
}
return 0;
}
uintptr_t mcall_clear_ipi(void)
{
// only clear SSIP if no other events are pending
if (HLS()->device_response_queue_head == NULL) {
clear_csr(mip, MIP_SSIP);
mb();
}
return atomic_swap(&HLS()->ipi_pending, 0);
}
uintptr_t mcall_shutdown(void)
{
while (1) write_csr(mtohost, 1);
return 0;
}
uintptr_t mcall_set_timer(unsigned long long when)
{
write_csr(mtimecmp, when);
clear_csr(mip, MIP_STIP);
set_csr(mie, MIP_MTIP);
return 0;
}
uintptr_t mcall_dev_req(sbi_device_message *m)
{
if ((m->dev > 0xFFU) | (m->cmd > 0xFFU) | (m->data > 0x0000FFFFFFFFFFFFU)) return -EINVAL;
while (swap_csr(mtohost, TOHOST_CMD(m->dev, m->cmd, m->data)) != 0);
m->sbi_private_data = (uintptr_t)HLS()->device_request_queue_head;
HLS()->device_request_queue_head = m;
HLS()->device_request_queue_size++;
return 0;
}
uintptr_t mcall_dev_resp(void)
{
htif_interrupt(0, 0);
sbi_device_message* m = HLS()->device_response_queue_head;
if (m) {
//printm("resp %p\n", m);
sbi_device_message* next = (void*)atomic_read(&m->sbi_private_data);
HLS()->device_response_queue_head = next;
if (!next) {
HLS()->device_response_queue_tail = 0;
// only clear SSIP if no other events are pending
clear_csr(mip, MIP_SSIP);
mb();
if (HLS()->ipi_pending) set_csr(mip, MIP_SSIP);
}
}
return (uintptr_t)m;
}
uintptr_t mcall_hart_id(void)
{
return HLS()->hart_id;
}
void hls_init(uint32_t hart_id)
{
memset(HLS(), 0, sizeof(*HLS()));
HLS()->hart_id = hart_id;
}
uintptr_t htif_interrupt(uintptr_t mcause, uintptr_t* regs) {
uintptr_t fromhost = swap_csr(mfromhost, 0);
if (!fromhost)
return 0;
uintptr_t dev = FROMHOST_DEV(fromhost);
uintptr_t cmd = FROMHOST_CMD(fromhost);
uintptr_t data = FROMHOST_DATA(fromhost);
sbi_device_message* m = HLS()->device_request_queue_head;
sbi_device_message* prev = 0x0;
unsigned long i, n;
for (i = 0, n = HLS()->device_request_queue_size; i < n; i++) {
/*
if (!supervisor_paddr_valid(m, sizeof(*m))
&& EXTRACT_FIELD(read_csr(mstatus), MSTATUS_PRV1) != PRV_M)
panic("htif: page fault");
*/
sbi_device_message* next = (void*)m->sbi_private_data;
if (m->dev == dev && m->cmd == cmd) {
m->data = data;
// dequeue from request queue
if (prev)
prev->sbi_private_data = (uintptr_t)next;
else
HLS()->device_request_queue_head = next;
HLS()->device_request_queue_size = n-1;
m->sbi_private_data = 0;
// enqueue to response queue
if (HLS()->device_response_queue_tail)
{
HLS()->device_response_queue_tail->sbi_private_data = (uintptr_t)m;
}
else
{
HLS()->device_response_queue_head = m;
}
HLS()->device_response_queue_tail = m;
// signal software interrupt
set_csr(mip, MIP_SSIP);
return 0;
}
prev = m;
m = (void*)atomic_read(&m->sbi_private_data);
}
//HLT();
return 0;
//panic("htif: no record");
}
uintptr_t mcall_console_putchar(uint8_t ch)
{
while (swap_csr(mtohost, TOHOST_CMD(1, 1, ch)) != 0);
while (1) {
uintptr_t fromhost = read_csr(mfromhost);
if (FROMHOST_DEV(fromhost) != 1 || FROMHOST_CMD(fromhost) != 1) {
if (fromhost)
htif_interrupt(0, 0);
continue;
}
write_csr(mfromhost, 0);
break;
}
return 0;
}
void testPrint(void) {
/* Print a test command to check Spike console output */
mcall_console_putchar('h');
mcall_console_putchar('e');
mcall_console_putchar('l');
mcall_console_putchar('l');
mcall_console_putchar('o');
mcall_console_putchar('\n');
}
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