Function flash_touch_cache

core/flash.c:55–86

}

uint32_t flash_touch_cache(uint32_t addr) {
    if (unlikely(++cpu.flashTotalAccesses == 0)) {
        cpu.flashTotalAccesses = 0x80000000;
        cpu.flashDelayCycles >>= 1;
    }
    uint32_t line = addr >> FLASH_CACHE_LINE_BITS;
    if (likely(line == flash.lastCacheLine)) {
        return 2;
    } else {
        flash.lastCacheLine = line;
        flash_cache_set_t* set = &flash.cacheTags[line & (FLASH_CACHE_SETS - 1)];
        uint16_t tag = (uint16_t)(line >> FLASH_CACHE_SET_BITS);
        if (likely(set->mru == tag)) {
            cpu.flashDelayCycles++;
            return 3;
        } else if (likely(set->lru == tag)) {
            /* Swap to track most-recently-used */
            set->lru = set->mru;
            set->mru = tag;
            cpu.flashDelayCycles++;
            return 3;
        } else {
            /* Handle a cache miss by replacing least-recently-used */
            set->lru = set->mru;
            set->mru = tag;
            cpu.flashCacheMisses++;
            /* Supposedly this takes from 195-201 cycles, but typically seems to be 196-197 */
            cpu.flashDelayCycles += 195;
            return 197;
        }
    }
}

static void flash_finish_command(void) {
    flash.commandStatus[0] |= 1 << 0;