matos/core/mem.h

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#pragma once
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#include "stdint.h"
#include "types.h"
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/**
* Physical Page management
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*/
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#define PAGE_SHIFT 12U
#define PAGE_SIZE (1U << PAGE_SHIFT)
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#define PAGE_MASK (PAGE_SIZE - 1)
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// Defined in linker.ld script
extern char __ld_kernel_begin;
extern char __ld_kernel_end;
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struct phyMemDesc {
paddr_t phy_addr;
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unsigned long ref;
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struct phyMemDesc *next, *prev;
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};
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/**
* Initi Physical Page management subsystem
**/
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int memSetup(paddr_t upperMem, paddr_t * firstUsed, paddr_t *lastUsed);
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/**
* Declare a physical region to be managed by the physica page subsystem
**/
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int memAddBank(paddr_t bottomMem, paddr_t topMem, int isFree);
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/**
* Request @params nbPage free physical pages
**/
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paddr_t allocPhyPage(uint nbPage);
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/**
* Decrement the nb of user of a given physical page
**/
int unrefPhyPage(paddr_t addr);
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/**
* Increment the nb of user of a given physical page
**/
int refPhyPage(paddr_t addr);
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/**
* Return the number of physical allocated pages
**/
unsigned long getNbAllocatedPage(void);
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void memGetStat(uint *free, uint *used);