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/* util.c -- Utility functions for OpenRISC 1000.
*
* Copyright (c) 2014 Authors
*
* Contributor Julius Baxter <julius.baxter@orsoc.se>
* Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de>
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include <stdint.h>
#include <stddef.h>
#include <reent.h>
#include "or1k-internals.h"
#ifdef __OR1K_MULTICORE__
// Define pointers to arrays
uint8_t* *_or1k_stack_core;
uint8_t* *_or1k_exception_stack_core;
uint32_t* *_or1k_exception_level;
#else
// Define scalar
uint32_t _or1k_exception_level;
#endif
uint8_t* _or1k_stack_top;
uint8_t* _or1k_stack_bottom;
uint8_t* _or1k_exception_stack_top;
uint8_t* _or1k_exception_stack_bottom;
void _or1k_init() {
#ifdef __OR1K_MULTICORE__
uint32_t c;
// Initialize stacks
_or1k_stack_core = _sbrk_r(0, sizeof(uint8_t*) * or1k_numcores());
_or1k_exception_stack_core = _sbrk_r(0, sizeof(uint8_t*) * or1k_numcores());
_or1k_stack_core[0] = _or1k_stack_top;
_or1k_exception_stack_core[0] = _or1k_exception_stack_top;
for (c = 1; c < or1k_numcores(); c++) {
_or1k_stack_core[c] = _or1k_stack_core[c-1] - _or1k_stack_size;
_or1k_exception_stack_core[c] = _or1k_exception_stack_core[c-1] -
_or1k_exception_stack_size;
}
size_t exc_size = sizeof(void*) * or1k_numcores() * OR1K_NUM_EXCEPTIONS;
_or1k_exception_handler_table = _sbrk_r(0, exc_size);
size_t int_size = sizeof(void*) * or1k_numcores() * 32;
size_t intdata_size = sizeof(void*) * or1k_numcores() * 32;
_or1k_interrupt_handler_table = _sbrk_r(0, int_size);
_or1k_interrupt_handler_data_ptr_table = _sbrk_r(0, intdata_size);
#endif
_or1k_reent_init();
#ifdef __OR1K_MULTICORE__
for (c = 0; c < or1k_numcores(); c++) {
_or1k_exception_handler_table[c][6] = _or1k_interrupt_handler;
}
#else
_or1k_exception_handler_table[6] = _or1k_interrupt_handler;
#endif
#ifdef __OR1K_MULTICORE__
_or1k_exception_level = _sbrk_r(0, 4 * or1k_numcores());
for (c = 0; c < or1k_numcores(); c++) {
_or1k_exception_level[c] = 0;
}
#else
_or1k_exception_level = 0;
#endif
}
uint32_t or1k_critical_begin() {
uint32_t iee = or1k_interrupts_disable();
uint32_t tee = or1k_timer_disable();
return (iee << 1) | tee;
}
void or1k_critical_end(uint32_t restore) {
or1k_timer_restore(restore & 0x1);
or1k_interrupts_restore((restore >> 1) & 0x1);
}
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