Mark
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/** vim: set ft=cpp.doxygen :
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* @file sys/vmalloc.h
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* @brief Contiguous virtual memory range management functions
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*/
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#pragma once
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#include "sys/mm.h"
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#define VM_ALLOC_USER (1 << 0)
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#define VM_ALLOC_WRITE (1 << 1)
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/**
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* @brief Find a free contiguous memory range inside a given one
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* in a virtual memory space.
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* @param pd Virtual memory space
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* @param from Start of the range to allocate from
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* @param to End of the range to allocate from
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* @param npages Size of the needed range in 4K pages
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* @return Address of the resulting range on success,
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* MM_NADDR if such range cannot be allocated
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*/
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uintptr_t vmfind(const mm_space_t pd, uintptr_t from, uintptr_t to, size_t npages);
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/**
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* @brief Allocate a contiguous virtual memory range in a space
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* within `from'..`to' limits and map it to a set of
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* physical pages (which may not be contiguous).
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* @param pd Virtual memory space
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* @param from Start of the range to allocate from
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* @param to End of the range to allocate from
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* @param npages Count of 4K pages to allocate
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* @param flags:
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* * VM_ALLOC_USER - The range is available for userspace
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* * VM_ALLOC_WRITE - The range is writable
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* @return Virtual address of the resulting range on success,
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* MM_NADDR otherwise
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*/
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uintptr_t vmalloc(mm_space_t pd, uintptr_t from, uintptr_t to, size_t npages, int flags);
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/**
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* @brief Deallocate a virtual memory range and physical pages
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* it's mapped to.
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* @param pd Virtual memory space
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* @param addr Address of the beginning of the range
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* @param npages Size of the range in 4K pages
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*/
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void vmfree(mm_space_t pd, uintptr_t addr, size_t npages);
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