add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/alpha/kernel/core_t2.c
..
..
@@ -351,7 +351,7 @@
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 	/* Note we can only do 1 SG window, as the other is for direct, so
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 	   do an ISA SG area, especially for the floppy. */
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-	hose->sg_isa = iommu_arena_new(hose, base, length, 0);
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+	hose->sg_isa = iommu_arena_new(hose, base, length, SMP_CACHE_BYTES);
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 	hose->sg_pci = NULL;
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 	temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20);