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 */
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 */
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#ifndef __mips_PAGE_H__
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#ifndef __mips_PAGE_H__
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#define __mips_PAGE_H__
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#define __mips_PAGE_H__
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#include <arch/mm/tlb.h>
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#include <mm/page.h>
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#include <arch/mm/frame.h>
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#include <arch/mm/frame.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <arch.h>
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#define PAGE_SIZE   FRAME_SIZE
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#define PAGE_SIZE   FRAME_SIZE
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#define KA2PA(x)    ((x) - 0x80000000)
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#define KA2PA(x)    ((x) - 0x80000000)
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#define PA2KA(x)    ((x) + 0x80000000)
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#define PA2KA(x)    ((x) + 0x80000000)
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#define page_arch_init()    ;
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/*
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/*
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 * Implementation of generic 4-level page table interface.
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 * Implementation of generic 4-level page table interface.
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 * TODO: this is a fake implementation provided to satisfy the compiler
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 * NOTE: this implementation is under construction
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 *
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 * Page table layout:
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 * - 32-bit virtual addresses
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 * - Offset is 14 bits => pages are 16K long
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 * - PTE's use the same format as CP0 EntryLo[01] registers => PTE is therefore 4 bytes long
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 * - PTL0 has 64 entries (6 bits)
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 * - PTL1 is not used
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 * - PTL2 is not used
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 * - PTL3 has 4096 entries (12 bits)
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 */
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 */
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#define PTL0_INDEX_ARCH(vaddr)  0
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#define PTL0_INDEX_ARCH(vaddr)  ((vaddr)>>26)
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#define PTL1_INDEX_ARCH(vaddr)  0
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#define PTL1_INDEX_ARCH(vaddr)  0
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#define PTL2_INDEX_ARCH(vaddr)  0
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#define PTL2_INDEX_ARCH(vaddr)  0
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#define PTL3_INDEX_ARCH(vaddr)  0
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#define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>14)&0xfff)
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#define GET_PTL0_ADDRESS_ARCH()                 (PTL0)
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#define SET_PTL0_ADDRESS_ARCH(ptl0)     (PTL0 = (pte_t *)(ptl0))
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#define GET_PTL0_ADDRESS_ARCH()                 ((pte_t *) 0)
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#define GET_PTL1_ADDRESS_ARCH(ptl0, i)          ((pte_t *) 0)
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#define GET_PTL1_ADDRESS_ARCH(ptl0, i)          (((pte_t *)(ptl0))[(i)].pfn<<14)
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#define GET_PTL2_ADDRESS_ARCH(ptl1, i)          ((pte_t *) 0)
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#define GET_PTL2_ADDRESS_ARCH(ptl1, i)          (ptl1)
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#define GET_PTL3_ADDRESS_ARCH(ptl2, i)          ((pte_t *) 0)
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#define GET_PTL3_ADDRESS_ARCH(ptl2, i)          (ptl2)
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#define GET_FRAME_ADDRESS_ARCH(ptl3, i)         ((pte_t *) 0)
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#define GET_FRAME_ADDRESS_ARCH(ptl3, i)         (((pte_t *)(ptl3))[(i)].pfn<<14)
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#define SET_PTL0_ADDRESS_ARCH(ptl0)
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#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
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#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].pfn = (a)>>14)
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#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
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#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
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#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
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#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
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#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
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#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].pfn = (a)>>14)
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#define GET_PTL1_FLAGS_ARCH(ptl0, i)            0
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#define GET_PTL1_FLAGS_ARCH(ptl0, i)            get_pt_flags((pte_t *)(ptl0), (index_t)(i))
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#define GET_PTL2_FLAGS_ARCH(ptl1, i)            0
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#define GET_PTL2_FLAGS_ARCH(ptl1, i)            PAGE_PRESENT
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#define GET_PTL3_FLAGS_ARCH(ptl2, i)            0
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#define GET_PTL3_FLAGS_ARCH(ptl2, i)            PAGE_PRESENT
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#define GET_FRAME_FLAGS_ARCH(ptl3, i)           0
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#define GET_FRAME_FLAGS_ARCH(ptl3, i)           get_pt_flags((pte_t *)(ptl3), (index_t)(i))
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#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)
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#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
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#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
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#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
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#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
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#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
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#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)
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#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
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static inline int get_pt_flags(pte_t *pt, index_t i)
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{
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    pte_t *p = &pt[i];
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    return (
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        ((p->c>PAGE_UNCACHED)<<PAGE_CACHEABLE_SHIFT) |
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        ((!p->v)<<PAGE_PRESENT_SHIFT) |
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        (1<<PAGE_USER_SHIFT) |
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        (1<<PAGE_READ_SHIFT) |
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        ((p->d)<<PAGE_WRITE_SHIFT) |
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        (1<<PAGE_EXEC_SHIFT)
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    );
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}
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static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
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{
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    pte_t *p = &pt[i];
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    p->c = (flags & PAGE_CACHEABLE) ? PAGE_CACHEABLE_EXC_WRITE : PAGE_UNCACHED;
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    p->v = !(flags & PAGE_NOT_PRESENT);
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    p->d = flags & PAGE_WRITE;
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}
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extern void page_arch_init(void);
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typedef __u32 pte_t;
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extern pte_t *PTL0;
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#endif
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#endif