44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
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/**
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* @file memory.h
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*
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* Memory mangament system: memory in Foenix/MCP is handled very simply.
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* The system will keep track of the top of available system RAM.
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* User programs can do whatever they want with system RAM from $400 to
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* the top of system RAM. Memory above top of system RAM is reserved for
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* the kernel and any terminate-stay-resident code the user cares to install.
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*
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* NOTE: this code does not manage video RAM or DRAM (on the A2560K)... only
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* system RAM, where code may be executed.
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*
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*/
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#ifndef __MEMORY_H
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#define __MEMORY_H
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#include "sys_macros.h"
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/*
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* Initialize the memory management system
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*
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* @param top_of_ram initial value for the top of system RAM
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*/
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extern void mem_init(unsigned long top_of_ram);
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/**
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* Return the top of system RAM... the user program must not use any
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* system memory from this address and above.
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*
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* @return the address of the first byte of reserved system RAM (one above the last byte the user program can use)
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*/
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extern SYSTEMCALL unsigned long mem_get_ramtop();
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/**
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* Reserve a block of memory at the top of system RAM.
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*
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* @param bytes the number of bytes to reserve
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* @return address of the first byte of the reserved block
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*/
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extern SYSTEMCALL unsigned long mem_reserve(unsigned long bytes);
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#endif
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