81 lines
3.6 KiB
C++
Executable File
81 lines
3.6 KiB
C++
Executable File
/*****************************************************************************
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* *
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* B U M P A L L O C A T O R *
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* *
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*---------------------------------------------------------------------------*
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* Beschreibung: Eine sehr einfache Heap-Verwaltung, welche freigegebenen *
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* Speicher nicht mehr nutzen kann. *
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* *
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* Autor: Michael Schoettner, HHU, 3.3.2022 *
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*****************************************************************************/
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#include "BumpAllocator.h"
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#include "kernel/system/Globals.h"
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namespace Kernel {
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/*****************************************************************************
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* Methode: BumpAllocator::init *
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*---------------------------------------------------------------------------*
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* Beschreibung: BumpAllokartor intitialisieren. *
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*****************************************************************************/
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void BumpAllocator::init() {
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/* Hier muess Code eingefuegt werden */
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allocations = 0;
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next = reinterpret_cast<uint8_t *>(heap_start);
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log.info() << "Initialized Bump Allocator" << endl;
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}
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/*****************************************************************************
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* Methode: BumpAllocator::dump_free_memory *
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*---------------------------------------------------------------------------*
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* Beschreibung: Ausgabe der Freispeicherinfos. Zu Debuggingzwecken. *
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*****************************************************************************/
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void BumpAllocator::dump_free_memory() {
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/* Hier muess Code eingefuegt werden */
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Kernel::kout << "Freier Speicher:" << endl
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<< " - Next: " << hex << reinterpret_cast<uint32_t>(next)
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<< ", Allocations: " << dec << allocations << endl;
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}
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/*****************************************************************************
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* Methode: BumpAllocator::alloc *
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*---------------------------------------------------------------------------*
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* Beschreibung: Einen neuen Speicherblock allozieren. *
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*****************************************************************************/
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void *BumpAllocator::alloc(uint32_t req_size) {
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/* Hier muess Code eingefuegt werden */
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log.debug() << "Requested " << hex << req_size << " Bytes" << endl;
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if (req_size + reinterpret_cast<uint32_t>(next) > heap_end) {
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log.error() << " - More memory requested than available :(" << endl;
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return nullptr;
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}
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void *allocated = next;
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next = reinterpret_cast<uint8_t *>(reinterpret_cast<uint32_t>(next) + req_size);
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allocations = allocations + 1;
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log.trace() << " - Allocated " << hex << req_size << " Bytes." << endl;
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return allocated;
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}
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/*****************************************************************************
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* Methode: BumpAllocator::free *
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*---------------------------------------------------------------------------*
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* Beschreibung: Nicht implementiert. *
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*****************************************************************************/
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void BumpAllocator::free(void *ptr) {
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log.error() << " mm_free: ptr= " << hex << reinterpret_cast<uint32_t>(ptr) << ", not supported" << endl;
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}
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}
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