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d4b6f1562a
Add Non-Uniform Memory Access (NUMA) support for LoongArch. LoongArch has 48-bit physical address, but the HyperTransport I/O bus only support 40-bit address, so we need a custom phys_to_dma() and dma_to_phys() to extract the 4-bit node id (bit 44~47) from Loongson-3's 48-bit physical address space and embed it into 40-bit. In the 40-bit dma address, node id offset can be read from the LS7A_DMA_CFG register. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
19 lines
402 B
C
19 lines
402 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Huacai Chen (chenhuacai@loongson.cn)
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_MMZONE_H_
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#define _ASM_MMZONE_H_
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#include <asm/page.h>
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#include <asm/numa.h>
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extern struct pglist_data *node_data[];
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#define NODE_DATA(nid) (node_data[(nid)])
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extern void setup_zero_pages(void);
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#endif /* _ASM_MMZONE_H_ */
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