5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*/
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/memblock.h>
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#include <linux/mm.h>
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#include <asm/bootinfo.h>
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#include <loongson.h>
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#include <mem.h>
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#include <pci.h>
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u32 memsize, highmemsize;
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void __init prom_init_memory(void)
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{
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memblock_add(0x0, (memsize << 20));
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#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
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{
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int bit;
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bit = fls(memsize + highmemsize);
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if (bit != ffs(memsize + highmemsize))
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bit += 20;
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else
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bit = bit + 20 - 1;
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/* set cpu window3 to map CPU to DDR: 2G -> 2G */
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LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
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0x80000000ul, (1 << bit));
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mmiowb();
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}
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#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
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#ifdef CONFIG_64BIT
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if (highmemsize > 0)
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memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
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#endif /* !CONFIG_64BIT */
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}
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/* override of arch/mips/mm/cache.c: __uncached_access */
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int __uncached_access(struct file *file, unsigned long addr)
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{
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if (file->f_flags & O_DSYNC)
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return 1;
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return addr >= __pa(high_memory) ||
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((addr >= LOONGSON_MMIO_MEM_START) &&
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(addr < LOONGSON_MMIO_MEM_END));
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}
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