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PageTableView

ostd::specs::mm::page_table

Struct PageTableView 

Source 
pub struct PageTableView {
    pub mappings: Set<Mapping>,
}
Expand description

A view of the page table is simply the set of mappings that it contains. Its invariant is a crucial property for memory correctness.

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§mappings: Set<Mapping>

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impl PageTableView

In addition to requiring that individual mappings be well-formed, a valid PageTableView must not have any overlapping mappings, in the physical or virtual address space. The virtual ranges not overlapping is a consequence of the structure of the page table. The physical ranges not overlapping must be maintained by the page table implementation.

Source

pub open spec fn inv(self) -> bool

{
    &&& forall |m: Mapping| self.mappings has m ==> m.inv()
    &&& forall |m: Mapping, n: Mapping| (
        self.mappings has m
            ==> (self.mappings has n
                ==> (m != n
                    ==> {
                        &&& m.va_range.end <= n.va_range.start
                            || n.va_range.end <= m.va_range.start
                        &&& m.pa_range.end <= n.pa_range.start
                            || n.pa_range.end <= m.pa_range.start

                    }))
    )

}

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