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Rev 3343 Rev 3665
Line 473... Line 473...
473
            panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid, istate->cr_iip);
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            panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid, istate->cr_iip);
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        }
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        }
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    }
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    }
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}
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}
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static int is_io_page_accessible(int page)
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{
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    if(TASK->arch.iomap) return bitmap_get(TASK->arch.iomap,page);
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    else return 0;
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}
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#define IO_FRAME_BASE 0xFFFFC000000
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/** There is special handling of memmaped lagacy io, because
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 * of 4KB sized access
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 * only for userspace
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 *
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 * @param va virtual address of page fault
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 * @param istate Structure with saved interruption state.
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 *
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 *
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 * @return 1 on success, 0 on fail
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 */
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static int try_memmap_io_insertion(uintptr_t va, istate_t *istate)
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{
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    if((va >= IO_OFFSET ) && (va < IO_OFFSET + (1<<IO_PAGE_WIDTH)))
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        if(TASK){
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            uint64_t io_page=(va &  ((1<<IO_PAGE_WIDTH)-1)) >> (USPACE_IO_PAGE_WIDTH);
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            if(is_io_page_accessible(io_page)){
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                //printf("Insert %llX\n",va);
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                uint64_t page,frame;
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                page = IO_OFFSET + (1 << USPACE_IO_PAGE_WIDTH) * io_page;
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                frame = IO_FRAME_BASE + (1 << USPACE_IO_PAGE_WIDTH) * io_page;
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                tlb_entry_t entry;
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                entry.word[0] = 0;
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                entry.word[1] = 0;
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                entry.p = true;         /* present */
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                entry.ma = MA_UNCACHEABLE;     
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                entry.a = true;         /* already accessed */
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                entry.d = true;         /* already dirty */
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                entry.pl = PL_USER;
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                entry.ar = AR_READ | AR_WRITE;
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                entry.ppn = frame >> PPN_SHIFT;    //MUSIM spocitat frame
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                entry.ps = USPACE_IO_PAGE_WIDTH;
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                dtc_mapping_insert(page, TASK->as->asid, entry); //Musim zjistit ASID
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                return 1;
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            }else {
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                fault_if_from_uspace(istate,"IO access fault at %p",va);
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                return 0;
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            }      
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        } else
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            return 0;
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    else
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        return 0;
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    return 0;
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}
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478
/** Data TLB fault handler for faults with VHPT turned off.
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/** Data TLB fault handler for faults with VHPT turned off.
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 *
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 *
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 * @param vector Interruption vector.
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 * @param vector Interruption vector.
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 * @param istate Structure with saved interruption state.
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 * @param istate Structure with saved interruption state.
482
 */
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 */
Line 509... Line 576...
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         * Insert it into data translation cache.
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         * Insert it into data translation cache.
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         */
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         */
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        dtc_pte_copy(t);
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        dtc_pte_copy(t);
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        page_table_unlock(AS, true);
579
        page_table_unlock(AS, true);
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    } else {
580
    } else {
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        page_table_unlock(AS, true);
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582
        if (try_memmap_io_insertion(va,istate)) return;
514
        /*
583
        /*
515
         * Forward the page fault to the address space page fault handler.
584
         * Forward the page fault to the address space page fault handler.
516
         */
585
         */
517
        page_table_unlock(AS, true);
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        if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
586
        if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
519
            fault_if_from_uspace(istate,"Page fault at %p",va);
587
            fault_if_from_uspace(istate,"Page fault at %p",va);
520
            panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid, istate->cr_iip);
588
            panic("%s: va=%p, rid=%d, iip=%p\n", __func__, va, rid, istate->cr_iip);
521
        }
589
        }
522
    }
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    }