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
12 struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
13 s64 __ro_after_init hyp_physvirt_offset;
14
15 static unsigned long base;
16 static unsigned long end;
17 static unsigned long cur;
18
19 unsigned long hyp_early_alloc_nr_used_pages(void)
20 {
21 return (cur - base) >> PAGE_SHIFT;
22 }
23
24 void *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
41 void *hyp_early_alloc_page(void *arg)
42 {
43 return hyp_early_alloc_contig(1);
44 }
45
46 static void hyp_early_alloc_get_page(void *addr) { }
47 static void hyp_early_alloc_put_page(void *addr) { }
48
49 void 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
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