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simplify layout pic

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This commit is contained in:
Frans Kaashoek 2018-10-02 08:50:05 -04:00
parent a0389f707f
commit ec110149ed
1 changed files with 3 additions and 3 deletions
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6
mmu.h
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@ -89,15 +89,15 @@ struct segdesc {
// | Sign | PML4 |Page Directory| Page Dir |Page Table | Offset Page |
// |Extend| Index | Pointer Index| Index | Index | in Page |
// +------+-------+--------------+----------+------------+-------------+
// \-PMX(va)-/\-PDPX(va)--/ \-PDX(va)-/ \-PTX(va)-/
// L3 pgtab L2 pgtab L1 pgtab L0 pgtab
// Page directory and page table constants.
#define NPDENTRIES 512 // # directory entries per page directory
#define NPDENTRIES 512 // # directory entries per page directory
#define PGSIZE 4096 // bytes mapped by a page
#define PGSHIFT 12 // offset of PTX in a linear address
#define PXMASK 0x1FF
#define PXSHIFT(n) (PGSHIFT+(9*(n)))
#define PXSHIFT(n) (PGSHIFT+(9*(n))) // shift for index into level n page table
#define PX(n, va) ((((uint64) (va)) >> PXSHIFT(n)) & PXMASK)
#define L_PML4 3