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This is equivalent to pmm.Frame (also a uintptr) but having different types for physical and virtual frames serves as an additional layer of protection for functions/methods that receive physical and/or virtual page arguments.
20 lines
667 B
Go
20 lines
667 B
Go
package vmm
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import "github.com/achilleasa/gopher-os/kernel/mem"
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// Page describes a virtual memory page index.
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type Page uintptr
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// Address returns a pointer to the virtual memory address pointed to by this Page.
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func (f Page) Address() uintptr {
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return uintptr(f << mem.PageShift)
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}
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// PageFromAddress returns a Page that corresponds to the given virtual
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// address. This function can handle both page-aligned and not aligned virtual
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// addresses. in the latter case, the input address will be rounded down to the
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// page that contains it.
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func PageFromAddress(virtAddr uintptr) Page {
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return Page((virtAddr & ^(uintptr(mem.PageSize - 1))) >> mem.PageShift)
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}
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