mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
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>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/shm.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/random.h>
|
|
#include <linux/io.h>
|
|
|
|
unsigned long shm_align_mask = (0x4000 >> 1) - 1; /* Sane caches */
|
|
|
|
#define COLOUR_ALIGN(addr, pgoff) \
|
|
((((addr) + shm_align_mask) & ~shm_align_mask) + \
|
|
(((pgoff) << PAGE_SHIFT) & shm_align_mask))
|
|
|
|
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct vm_area_struct *vmm;
|
|
int do_color_align;
|
|
|
|
if (flags & MAP_FIXED) {
|
|
/*
|
|
* We do not accept a shared mapping if it would violate
|
|
* cache aliasing constraints.
|
|
*/
|
|
if ((flags & MAP_SHARED) &&
|
|
((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
|
|
return -EINVAL;
|
|
return addr;
|
|
}
|
|
|
|
if (len > TASK_SIZE)
|
|
return -ENOMEM;
|
|
do_color_align = 0;
|
|
if (filp || (flags & MAP_SHARED))
|
|
do_color_align = 1;
|
|
if (addr) {
|
|
if (do_color_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(addr);
|
|
vmm = find_vma(current->mm, addr);
|
|
if (TASK_SIZE - len >= addr &&
|
|
(!vmm || addr + len <= vmm->vm_start))
|
|
return addr;
|
|
}
|
|
addr = TASK_UNMAPPED_BASE;
|
|
if (do_color_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(addr);
|
|
|
|
for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
|
|
/* At this point: (!vmm || addr < vmm->vm_end). */
|
|
if (TASK_SIZE - len < addr)
|
|
return -ENOMEM;
|
|
if (!vmm || addr + len <= vmm->vm_start)
|
|
return addr;
|
|
addr = vmm->vm_end;
|
|
if (do_color_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
}
|
|
}
|