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added some preprocessor macros for upcoming paging code

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This commit is contained in:
Steffen Vogel 2014-08-21 20:13:55 +02:00
parent d2db43e93a
commit e514ae24f8
1 changed files with 8 additions and 4 deletions
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12
arch/x86/include/asm/page.h
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@ -54,6 +54,9 @@
/// Mask the page address without page map flags
#define PAGE_MASK 0xFFFFF000
/// Make address canonical
#define CANONICAL(addr) (addr) // only for 32 bit paging
/// The number of entries in a page map table
#define PAGE_MAP_ENTRIES (1L << PAGE_MAP_BITS)
@ -61,6 +64,11 @@
#define PAGE_MAP_PGD 0xFFFFF000
#define PAGE_MAP_PGT 0xFFC00000
/// Align to next page
#define PAGE_FLOOR(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
/// Align to page
#define PAGE_CEIL(addr) ( (addr) & PAGE_MASK)
/// Page is present
#define PG_PRESENT (1 << 0)
/// Page is read- and writable
@ -84,10 +92,6 @@
/// This page or table is used during the boot process
#define PG_BOOT (1 << 9)
/// This is a whole set of flags (PRESENT,RW,ACCESSED,DIRTY) for kernelspace tables
#define PG_TABLE (PG_PRESENT|PG_RW)
/// This is a whole set of flags (PRESENT,RW,GLOBAL) for kernelspace pages
#define PG_PAGE (PG_PRESENT|PG_RW|PG_GLOBAL)
/** @brief A single entry in a page map
*