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[kernel] Move the page table cache into page_table

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Further chipping away at page_manager: the cache of pages to be used as
page tables gets moved to a static in page_table.
This commit is contained in:
Justin C. Miller
2020-09-17 21:30:05 -07:00
parent 09575370ce
commit ac67111b83
7 changed files with 86 additions and 71 deletions
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16
src/kernel/page_table.h
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@@ -5,6 +5,7 @@
#include <stdint.h>
#include "kernel_memory.h"
struct free_page_header;
class page_manager;
/// Struct to allow easy accessing of a memory page being used as a page table.
@@ -111,6 +112,21 @@ struct page_table
uint16_t m_index[D];
};
/// Allocate a page for a page table, or pull one from the cache
/// \returns An empty page, mapped in the linear offset area
static page_table * get_table_page();
/// Return a page table's page to the page cache.
/// \arg pt The page to be returned
static void free_table_page(page_table *pt);
// Ensure the page table page cache has a minimum number of pages
// in it.
static void fill_table_page_cache();
static free_page_header *s_page_cache; ///< Cache of free pages to use for tables
static size_t s_cache_count; ///< Number of pages in s_page_cache
/// Get an entry in the page table as a page_table pointer
/// \arg i Index of the entry in this page table
/// \arg flags [out] If set, this will receive the entry's flags