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
46static void hyp_early_alloc_get_page(void *addr) { }
47static void hyp_early_alloc_put_page(void *addr) { }
48
49void hyp_early_alloc_init(void *virt, unsigned long size)
50{
51	base = cur = (unsigned long)virt;
52	end = base + size;
53
54	hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
55	hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
56	hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
57	hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page;
58	hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page;
59}
60