rusty_mos::memory

Module pmap

Source
Expand description

The page-memory manager model of MOS. Core functions are provided here.

Structs§

  • PageData
    The only page data needed to maintain.

Constants§

Statics§

  • CUR_PGDIR
    Current env’s page directary address.
  • KERN_HEAP
    The kernel heap start. Used by the buddy system.
  • NPAGE
    The the count of all the pages available.
  • PAGES
    The kernel array for all pages.
  • PAGE_FREE_LIST
    The list of free pages.

Functions§

  • alloc 🔒
    Alloc needed memorys in kernel mode. Only use it before the page-manager is ready to use.
  • mips_detect_memory
    Calculate the NPAGE and validate it.
  • mips_vm_init
    Alloc memories needed for the PAGES and reserve 512 * 4KB spaces for the buddy system to alloc.
  • page_alloc
    Alloc a page. Return the page’s address or an error if no free pages available.
  • page_decref
    Decrease the page’s pp_ref. If all reference is removed, the page will be freed.
  • page_free
    Free a page. The pp_ref shall be zero before freeing it.
  • page_init
    Init all the pages. Mark the pages below the freemem as used.
  • page_insert
    Map the physical page to the virtual address va. The permission bits will be set to perm | PTE_C_CACHEABLE | PTE_V.
  • page_lookup
    Look up the Page that virtual address va map to. Return the page and the page table entry together if the page is found and is valid.
  • page_remove
    Unmap the physical page at virtual address va.
  • pgdir_walk
    Walk the current page table to find the virtual address va’s page table entry (Pte).

Type Aliases§