c461731836
Multiple Loongson-3A chips can be interconnected with HT0-bus. This is a CC-NUMA system that every chip (node) has its own local memory and cache coherency is maintained by hardware. The 64-bit physical memory address format is as follows: 0x-0000-YZZZ-ZZZZ-ZZZZ The high 16 bits should be 0, which means the real physical address supported by Loongson-3 is 48-bit. The "Y" bits is the base address of each node, which can be also considered as the node-id. The "Z" bits is the address offset within a node, which means every node has a 44 bits address space. Macros XPHYSADDR and MAX_PHYSMEM_BITS are modified unconditionally, because many other MIPS CPUs have also extended their address spaces. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7187/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 Embedded Alley Solutions, Inc
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* Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2009 Jiajie Chen (chenjiajie@cse.buaa.edu.cn)
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* Copyright (C) 2012 Huacai Chen (chenhc@lemote.com)
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*/
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#ifndef __ASM_MACH_LOONGSON_KERNEL_ENTRY_H
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#define __ASM_MACH_LOONGSON_KERNEL_ENTRY_H
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/*
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* Override macros used in arch/mips/kernel/head.S.
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*/
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.macro kernel_entry_setup
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#ifdef CONFIG_CPU_LOONGSON3
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.set push
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.set mips64
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/* Set LPA on LOONGSON3 config3 */
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mfc0 t0, $16, 3
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or t0, (0x1 << 7)
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mtc0 t0, $16, 3
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/* Set ELPA on LOONGSON3 pagegrain */
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li t0, (0x1 << 29)
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mtc0 t0, $5, 1
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_ehb
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.set pop
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#endif
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.endm
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/*
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* Do SMP slave processor setup.
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*/
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.macro smp_slave_setup
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#ifdef CONFIG_CPU_LOONGSON3
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.set push
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.set mips64
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/* Set LPA on LOONGSON3 config3 */
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mfc0 t0, $16, 3
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or t0, (0x1 << 7)
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mtc0 t0, $16, 3
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/* Set ELPA on LOONGSON3 pagegrain */
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li t0, (0x1 << 29)
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mtc0 t0, $5, 1
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_ehb
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.set pop
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#endif
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.endm
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#endif /* __ASM_MACH_LOONGSON_KERNEL_ENTRY_H */
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