ZealOS/src/Kernel/Memory/BlkPool.CC

U0 BlkPoolAdd(CBlkPool *bp, CMemBlk *m, I64 pags)
{//Add mem to BlkPool.
	if (sys_mem_init_flag)
		MemSet(m, sys_mem_init_val, pags * MEM_PAG_SIZE);

	PUSHFD
	CLI
	while (LBts(&bp->locked_flags, BPlf_LOCKED))
		PAUSE
	m->next			= bp->mem_free_list;
	m->pags			= pags;
	m->mb_signature	= MBS_UNUSED_SIGNATURE_VAL;
	bp->alloced_u8s  += pags << MEM_PAG_BITS;
	bp->mem_free_list = m;
	LBtr(&bp->locked_flags, BPlf_LOCKED);
	POPFD
}

U0 BlkPoolInit(CBlkPool *bp, I64 pags)
{//Make mem chunk into a BlkPool.
	I64		 num;
	CMemBlk	*m;

	MemSet(bp, 0, sizeof(CBlkPool));
	m = (bp(U8 *) + sizeof(CBlkPool) + MEM_PAG_SIZE - 1) & ~(MEM_PAG_SIZE - 1);
	num = (bp(U8 *) + pags << MEM_PAG_BITS - m(U8 *)) >> MEM_PAG_BITS;
	bp->alloced_u8s = (pags-num) << MEM_PAG_BITS; //Compensate before num added.
	BlkPoolAdd(bp, m, num);
}

U0 BlkPoolsInit()
{
	I64			 i, total, lo, hi, code_heap_limit;
	CMemE820	*m20   = MEM_E820;
	Bool		 first = TRUE;

	total = MemBIOSTotal;

	if (total <= 0x80000000)
		code_heap_limit = total;
	else if (total <= 0x100000000)
		code_heap_limit = total / 4;
	else
		code_heap_limit = 0x80000000;

	i = code_heap_limit - SYS_16MEG_AREA_LIMIT; //See $LK,"RLf_16MEG_SYS_CODE_BP",A="FF:::/Kernel/Memory/PageTables.CC,RLf_16MEG_SYS_CODE_BP"$
	BlkPoolAdd(sys_code_bp, SYS_16MEG_AREA_LIMIT, i >> MEM_PAG_BITS);
	mem_heap_limit = i + SYS_16MEG_AREA_LIMIT - 1;

	if (code_heap_limit<total)
	{
		while (m20->type)
		{
			if (m20->type == MEM_E820t_USABLE)
			{
				lo = m20->base;
				hi = m20->base + m20->len;
				if (lo<code_heap_limit)
				{
					if (hi > code_heap_limit)
						lo = code_heap_limit;
					else
						hi = lo; //cancel
				}
				if (code_heap_limit <= lo < hi)
				{
					if (first)
					{
						BlkPoolInit(lo, (hi - lo) >> MEM_PAG_BITS);
						sys_data_bp = lo;
						Fs->data_heap = HeapCtrlInit(, Fs, sys_data_bp);
						first = FALSE;
					}
					else
						BlkPoolAdd(sys_data_bp, lo, (hi - lo) >> MEM_PAG_BITS);
				}
			}
			m20++;
		}
	}
	LBts(&sys_run_level, RLf_FULL_HEAPS);
}