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1 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ia32mm
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 * @{
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 */
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/** @file
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 */
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#include <arch/mm/page.h>
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#include <genarch/mm/page_pt.h>
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#include <genarch/drivers/ega/ega.h>
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#include <genarch/drivers/legacy/ia32/io.h>
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#include <arch/mm/frame.h>
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <mm/as.h>
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#include <arch/types.h>
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#include <align.h>
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#include <config.h>
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#include <func.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <debug.h>
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#include <memstr.h>
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#include <print.h>
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#include <interrupt.h>
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#include <ddi/ddi.h>
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/** Physical memory area for devices. */
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static parea_t dev_area;
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static parea_t ega_area;
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void page_arch_init(void)
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{
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    uintptr_t cur;
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    int flags;
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    if (config.cpu_active == 1) {
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        page_mapping_operations = &pt_mapping_operations;
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        /*
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         * PA2KA(identity) mapping for all frames until last_frame.
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         */
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        for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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            flags = PAGE_CACHEABLE | PAGE_WRITE;
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            if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
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                flags |= PAGE_GLOBAL;
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            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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        }
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        exc_register(14, "page_fault", (iroutine) page_fault);
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        write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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    } else
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        write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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    paging_on();
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}
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uintptr_t hw_map(uintptr_t physaddr, size_t size)
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{
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    if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
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        panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
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    uintptr_t virtaddr = PA2KA(last_frame);
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    pfn_t i;
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    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
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        uintptr_t addr = PFN2ADDR(i);
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        page_mapping_insert(AS_KERNEL, virtaddr + addr, physaddr + addr, PAGE_NOT_CACHEABLE | PAGE_WRITE);
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    }
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    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
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    return virtaddr;
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}
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void hw_area(void)
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{
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    dev_area.pbase = end_frame;
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    dev_area.frames = SIZE2FRAMES(0xffffffff - end_frame);
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    ddi_parea_register(&dev_area);
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    ega_area.pbase = EGA_VIDEORAM;
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    ega_area.frames = SIZE2FRAMES(EGA_VRAM_SIZE);
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    ddi_parea_register(&ega_area);
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}
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void page_fault(int n __attribute__((unused)), istate_t *istate)
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{
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    uintptr_t page;
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    pf_access_t access;
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    page = read_cr2();
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    if (istate->error_word & PFERR_CODE_RSVD)
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        panic("Reserved bit set in page directory.");
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    if (istate->error_word & PFERR_CODE_RW)
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        access = PF_ACCESS_WRITE;
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    else
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        access = PF_ACCESS_READ;
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    if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
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        fault_if_from_uspace(istate, "Page fault: %#x.", page);
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        decode_istate(istate);
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        printf("page fault address: %#lx\n", page);
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        panic("Page fault.");
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    }
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}
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/** @}
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 */