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 * 1:1 virtual-physical mapping is created in kernel address space. Mapping
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 * 1:1 virtual-physical mapping is created in kernel address space. Mapping
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 * for table with exception vectors is also created.
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 * for table with exception vectors is also created.
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 */
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 */
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void page_arch_init(void)
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void page_arch_init(void)
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{
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{
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    uintptr_t cur;
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    int flags;
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    int flags = PAGE_CACHEABLE;
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 - 
 
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    page_mapping_operations = &pt_mapping_operations;
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    page_mapping_operations = &pt_mapping_operations;
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    flags = PAGE_CACHEABLE;
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    uintptr_t cur;
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    /* PA2KA(identity) mapping for all frames until last_frame */
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    /* Kernel identity mapping */
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    for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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    for (cur = 0; cur < last_frame; cur += FRAME_SIZE)
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        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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        page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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    }
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    /* create mapping for exception table at high offset */
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    /* Create mapping for exception table at high offset */
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#ifdef HIGH_EXCEPTION_VECTORS
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#ifdef HIGH_EXCEPTION_VECTORS
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    void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
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    void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
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    page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
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    page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
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#else
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#else
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#error "Only high exception vector supported now"
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#error "Only high exception vector supported now"