Mark
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/** vim:ft=c.doxygen
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* @file sys/mem/phys.h
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* @brief Physical memory control functions
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*/
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#pragma once
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#include "sys/types.h"
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#include "sys/list.h"
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extern struct page *mm_pages;
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#define PHYS2PAGE(phys) \
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(&mm_pages[((uintptr_t) (phys)) / MM_PAGE_SIZE])
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#define PAGE2PHYS(page) \
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(MM_PAGE_SIZE * ((uintptr_t) (phys) - (uintptr_t) pages) / sizeof(struct page))
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#define PG_ALLOC (1 << 0)
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#define PG_MMAPED (1 << 1)
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struct page {
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uint64_t flags;
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enum page_usage {
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PU_UNKNOWN = 0,
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PU_PRIVATE, // Program data: image + mmap()ed anonymous regions
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PU_SHARED, // Shared memory mapping
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PU_DEVICE, // Possibly shared device mapping
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PU_KERNEL, // Not a userspace page
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PU_PAGING, // Paging structures
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PU_CACHE,
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_PU_COUNT
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} usage;
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size_t refcount;
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};
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struct mm_phys_reserved {
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uintptr_t begin, end;
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struct list_head link;
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};
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struct mm_phys_stat {
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size_t pages_total;
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size_t pages_free;
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size_t pages_used_kernel;
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size_t pages_used_user;
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size_t pages_used_shared;
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size_t pages_used_paging;
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size_t pages_used_cache;
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};
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void mm_phys_reserve(const char *use, struct mm_phys_reserved *res);
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void mm_phys_stat(struct mm_phys_stat *st);
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/**
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* @brief Allocate a single physical memory region of MM_PAGE_SIZE bytes
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* @return MM_NADDR on failure, a page-aligned physical address otherwise
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*/
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uintptr_t mm_phys_alloc_page(enum page_usage pu);
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/**
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* @brief Allocates a contiguous physical memory region of MM_PAGE_SIZE * \p count bytes
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* @param count Size of the region in pages
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* @return MM_NADDR on failure, a page-aligned physical address otherwise
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*/
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uintptr_t mm_phys_alloc_contiguous(size_t count, enum page_usage pu);
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/**
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* @brief Free a physical page
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* @param addr Physical memory page address, aligned to page boundary
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*/
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void mm_phys_free_page(uintptr_t addr);
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