#include <stddef.h>

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Enumerations
enum	palloc_flags { PAL_ASSERT = 001 , PAL_ZERO = 002 , PAL_USER = 004 }
	How to allocate pages. More...

Functions
void	palloc_init (size_t user_page_limit)
	Initializes the page allocator. More...

void *	palloc_get_page (enum palloc_flags)
	Obtains a single free page and returns its kernel virtual address. More...

void *	palloc_get_multiple (enum palloc_flags, size_t page_cnt)
	Obtains and returns a group of PAGE_CNT contiguous free pages. More...

void	palloc_free_page (void *)
	Frees the page at PAGE. More...

void	palloc_free_multiple (void *, size_t page_cnt)
	threads/palloc.h More...

Enumeration Type Documentation

◆ palloc_flags

enum palloc_flags

How to allocate pages.

Enumerator
PAL_ASSERT	Panic on failure.
PAL_ZERO	Zero page contents.
PAL_USER	User page.

Definition at line 7 of file palloc.h.

Function Documentation

◆ palloc_free_multiple()

void palloc_free_multiple	(	void *	pages,
		size_t	page_cnt
	)

threads/palloc.h

Definition at line 118 of file palloc.c.

References ASSERT, pool::base, bitmap_all(), bitmap_set_multiple(), memset(), NOT_REACHED, NULL, page_from_pool(), pg_no(), pg_ofs(), PGSIZE, pool::used_map, and user_pool.

Referenced by free(), and palloc_free_page().

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◆ palloc_free_page()

void palloc_free_page ( void * page )

Frees the page at PAGE.

Definition at line 146 of file palloc.c.

References palloc_free_multiple().

Referenced by free(), fsutil_cat(), load_segment(), pagedir_destroy(), process_execute(), setup_stack(), start_process(), and thread_schedule_tail().

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◆ palloc_get_multiple()

void * palloc_get_multiple	(	enum palloc_flags	flags,
		size_t	page_cnt
	)

Obtains and returns a group of PAGE_CNT contiguous free pages.

If PAL_USER is set, the pages are obtained from the user pool, otherwise from the kernel pool. If PAL_ZERO is set in FLAGS, then the pages are filled with zeros. If too few pages are available, returns a null pointer, unless PAL_ASSERT is set in FLAGS, in which case the kernel panics.

Definition at line 71 of file palloc.c.

References pool::base, BITMAP_ERROR, bitmap_scan_and_flip(), pool::lock, lock_acquire(), lock_release(), memset(), NULL, PAL_ASSERT, PAL_USER, PAL_ZERO, PANIC, PGSIZE, pool::used_map, and user_pool.

Referenced by malloc(), and palloc_get_page().

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◆ palloc_get_page()

void * palloc_get_page ( enum palloc_flags flags )

Obtains a single free page and returns its kernel virtual address.

If PAL_USER is set, the page is obtained from the user pool, otherwise from the kernel pool. If PAL_ZERO is set in FLAGS, then the page is filled with zeros. If no pages are available, returns a null pointer, unless PAL_ASSERT is set in FLAGS, in which case the kernel panics.

Definition at line 111 of file palloc.c.

References palloc_get_multiple().

Referenced by fsutil_cat(), load_segment(), lookup_page(), malloc(), pagedir_create(), paging_init(), process_execute(), setup_stack(), thread_create(), and tss_init().

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