linux/arch/arm64/kvm/hyp/nvhe/early_alloc.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2020 Google LLC
   4 * Author: Quentin Perret <qperret@google.com>
   5 */
   6
   7#include <asm/kvm_pgtable.h>
   8
   9#include <nvhe/early_alloc.h>
  10#include <nvhe/memory.h>
  11
  12struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
  13s64 __ro_after_init hyp_physvirt_offset;
  14
  15static unsigned long base;
  16static unsigned long end;
  17static unsigned long cur;
  18
  19unsigned long hyp_early_alloc_nr_used_pages(void)
  20{
  21        return (cur - base) >> PAGE_SHIFT;
  22}
  23
  24void *hyp_early_alloc_contig(unsigned int nr_pages)
  25{
  26        unsigned long size = (nr_pages << PAGE_SHIFT);
  27        void *ret = (void *)cur;
  28
  29        if (!nr_pages)
  30                return NULL;
  31
  32        if (end - cur < size)
  33                return NULL;
  34
  35        cur += size;
  36        memset(ret, 0, size);
  37
  38        return ret;
  39}
  40
  41void *hyp_early_alloc_page(void *arg)
  42{
  43        return hyp_early_alloc_contig(1);
  44}
  45
  46void hyp_early_alloc_init(void *virt, unsigned long size)
  47{
  48        base = cur = (unsigned long)virt;
  49        end = base + size;
  50
  51        hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
  52        hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
  53        hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
  54}
  55
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