mirror of
https://github.com/switchbrew/libnx.git
synced 2025-06-22 04:52:39 +02:00
a05a44fca8
- Added virtmemLock/Unlock, needed for atomic find-and-map operations
- Added virtmemFindAslr, which looks for a random free area in AslrRegion
- virtmemReserve still exists for legacy callers who rely on sequential
allocation in order to avoid race conditions from concurrent uses
- Added virtmemFindStack, which searches within StackRegion instead
- Removed virtmemReserveStack/FreeStack
- Changed shmem/thread/tmem/codememory-jit to use the new virtmem API
- Legacy jit still uses virtmemReserve
47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/**
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* @file virtmem.h
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* @brief Virtual memory mapping utilities
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* @author plutoo
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* @copyright libnx Authors
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*/
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#pragma once
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#include "../types.h"
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/**
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* @brief Reserves a slice of general purpose address space sequentially.
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* @param size Desired size of the slice (rounded up to page alignment).
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* @return Pointer to the slice of address space.
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*/
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void* virtmemReserve(size_t size);
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/**
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* @brief Relinquishes a slice of address space reserved with virtmemReserve (currently no-op).
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* @param addr Pointer to the slice.
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* @param size Size of the slice.
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*/
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void virtmemFree(void* addr, size_t size);
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/// Locks the virtual memory manager mutex.
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void virtmemLock(void);
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/// Unlocks the virtual memory manager mutex.
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void virtmemUnlock(void);
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/**
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* @brief Finds a random slice of free general purpose address space.
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* @param size Desired size of the slice (rounded up to page alignment).
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* @param guard_size Desired size of the unmapped guard areas surrounding the slice (rounded up to page alignment).
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* @return Pointer to the slice of address space, or NULL on failure.
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* @note The virtual memory manager mutex must be held during the find-and-map process (see \ref virtmemLock and \ref virtmemUnlock).
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*/
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void* virtmemFindAslr(size_t size, size_t guard_size);
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/**
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* @brief Finds a random slice of free stack address space.
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* @param size Desired size of the slice (rounded up to page alignment).
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* @param guard_size Desired size of the unmapped guard areas surrounding the slice (rounded up to page alignment).
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* @return Pointer to the slice of address space, or NULL on failure.
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* @note The virtual memory manager mutex must be held during the find-and-map process (see \ref virtmemLock and \ref virtmemUnlock).
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*/
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void* virtmemFindStack(size_t size, size_t guard_size);
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