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#include <memstr.h>
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#include <memstr.h>
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#include <macros.h>
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#include <macros.h>
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#include <arch.h>
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#include <arch.h>
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#include <align.h>
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#include <align.h>
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static int phys_page_fault(as_area_t *area, __address addr, pf_access_t access);
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static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access);
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static void phys_share(as_area_t *area);
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static void phys_share(as_area_t *area);
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mem_backend_t phys_backend = {
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mem_backend_t phys_backend = {
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    .page_fault = phys_page_fault,
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    .page_fault = phys_page_fault,
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    .frame_free = NULL,
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    .frame_free = NULL,
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 * @param addr Faulting virtual address.
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 * @param addr Faulting virtual address.
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 * @param access Access mode that caused the fault (i.e. read/write/exec).
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 * @param access Access mode that caused the fault (i.e. read/write/exec).
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 *
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 *
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 * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
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 * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
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 */
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 */
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int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)
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int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
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{
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{
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    __address base = area->backend_data.base;
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    uintptr_t base = area->backend_data.base;
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    if (!as_area_check_access(area, access))
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    if (!as_area_check_access(area, access))
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        return AS_PF_FAULT;
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        return AS_PF_FAULT;
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    ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
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    ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);