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Page struct related info in update memlayout.h

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chyyuu
2012-10-01 22:21:31 +08:00
parent 6a1b22578e
commit a0b91ae23f
7 changed files with 19 additions and 24 deletions
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4
code/lab2/kern/mm/memlayout.h
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@@ -104,8 +104,8 @@ struct Page {
};
/* Flags describing the status of a page frame */
#define PG_reserved 0 // the page descriptor is reserved for kernel or unusable
#define PG_property 1 // the member 'property' is valid
#define PG_reserved 0 // if this bit=1: the Page is reserved for kernel, cannot be used in alloc/free_pages; otherwise, this bit=0
#define PG_property 1 // if this bit=1: the Page is the head page of a free memory block(contains some continuous_addrress pages), and can be used in alloc_pages; if this bit=0: if the Page is the the head page of a free memory block, then this Page and the memory block is alloced. Or this Page isn't the head page.
#define SetPageReserved(page) set_bit(PG_reserved, &((page)->flags))
#define ClearPageReserved(page) clear_bit(PG_reserved, &((page)->flags))