cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ioremap.c (1052B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * I/O remap functions for Hexagon
      4 *
      5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
      6 */
      7
      8#include <linux/io.h>
      9#include <linux/vmalloc.h>
     10#include <linux/mm.h>
     11
     12void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
     13{
     14	unsigned long last_addr, addr;
     15	unsigned long offset = phys_addr & ~PAGE_MASK;
     16	struct vm_struct *area;
     17
     18	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
     19					|(__HEXAGON_C_DEV << 6));
     20
     21	last_addr = phys_addr + size - 1;
     22
     23	/*  Wrapping not allowed  */
     24	if (!size || (last_addr < phys_addr))
     25		return NULL;
     26
     27	/*  Rounds up to next page size, including whole-page offset */
     28	size = PAGE_ALIGN(offset + size);
     29
     30	area = get_vm_area(size, VM_IOREMAP);
     31	addr = (unsigned long)area->addr;
     32
     33	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
     34		vunmap((void *)addr);
     35		return NULL;
     36	}
     37
     38	return (void __iomem *) (offset + addr);
     39}
     40
     41void iounmap(const volatile void __iomem *addr)
     42{
     43	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
     44}