013de2d667
This patch adds files related to memory management and here is our memory-layout: Fixmap : 0xffc02000 – 0xfffff000 (4 MB - 12KB) Pkmap : 0xff800000 – 0xffc00000 (4 MB) Vmalloc : 0xf0200000 – 0xff000000 (238 MB) Lowmem : 0x80000000 – 0xc0000000 (1GB) abiv1 CPU (CK610) is VIPT cache and it doesn't support highmem. abiv2 CPUs are all PIPT cache and they could support highmem. Lowmem is directly mapped by msa0 & msa1 reg, and we needn't setup memory page table for it. Link:https://lore.kernel.org/lkml/20180518215548.GH17671@n2100.armlinux.org.uk/ Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Christoph Hellwig <hch@infradead.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/io.h>
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#include <asm/pgtable.h>
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void __iomem *ioremap(phys_addr_t addr, size_t size)
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{
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phys_addr_t last_addr;
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unsigned long offset, vaddr;
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struct vm_struct *area;
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pgprot_t prot;
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last_addr = addr + size - 1;
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if (!size || last_addr < addr)
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return NULL;
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offset = addr & (~PAGE_MASK);
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addr &= PAGE_MASK;
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size = PAGE_ALIGN(size + offset);
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area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0));
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if (!area)
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return NULL;
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vaddr = (unsigned long)area->addr;
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prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
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_PAGE_GLOBAL | _CACHE_UNCACHED);
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if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
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free_vm_area(area);
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return NULL;
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}
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return (void __iomem *)(vaddr + offset);
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}
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EXPORT_SYMBOL(ioremap);
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void iounmap(void __iomem *addr)
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{
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vunmap((void *)((unsigned long)addr & PAGE_MASK));
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}
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EXPORT_SYMBOL(iounmap);
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