1 | // SPDX-License-Identifier: GPL-3.0-or-later |
2 | |
3 | #include "mos/mm/paging/pmlx/pml1.hpp" |
4 | |
5 | #include "mos/assert.hpp" |
6 | #include "mos/mm/paging/pml_types.hpp" |
7 | #include "mos/platform/platform.hpp" |
8 | |
9 | #include <algorithm> |
10 | #include <mos_stdlib.hpp> |
11 | |
12 | #if MOS_PLATFORM_PAGING_LEVELS < 1 |
13 | #error "Give up your mind" |
14 | #endif |
15 | |
16 | void pml1_traverse(pml1_t pml1, ptr_t *vaddr, size_t *n_pages, pagetable_walk_options_t callback, void *data) |
17 | { |
18 | for (size_t pml1_i = pml1_index(*vaddr); pml1_i < PML1_ENTRIES && *n_pages; pml1_i++) |
19 | { |
20 | pml1e_t *pml1e = pml1_entry(pml1, vaddr: *vaddr); |
21 | if (callback.pml1e_callback) |
22 | callback.pml1e_callback(pml1, pml1e, *vaddr, data); |
23 | (*vaddr) += std::min(a: *n_pages, b: (size_t) PML1E_NPAGES) * MOS_PAGE_SIZE; |
24 | (*n_pages) -= std::min(a: *n_pages, b: (size_t) PML1E_NPAGES); |
25 | } |
26 | } |
27 | |
28 | bool pml1_destroy_range(pml1_t pml1, ptr_t *vaddr, size_t *n_pages) |
29 | { |
30 | const bool should_zap_this_pml1 = pml1_index(*vaddr) == 0 && *n_pages >= PML1_ENTRIES * PML1E_NPAGES; |
31 | |
32 | for (size_t pml1_i = pml1_index(*vaddr); pml1_i < PML1_ENTRIES && *n_pages; pml1_i++) |
33 | { |
34 | pml1e_t *pml1e = pml1_entry(pml1, vaddr: *vaddr); |
35 | MOS_ASSERT(!pml1e_is_present(pml1e)); |
36 | |
37 | (*vaddr) += PML1E_NPAGES * MOS_PAGE_SIZE; |
38 | (*n_pages) -= PML1E_NPAGES; |
39 | } |
40 | |
41 | if (should_zap_this_pml1) |
42 | pml_destroy_table(pml1); |
43 | |
44 | return should_zap_this_pml1; |
45 | } |
46 | |
47 | pml1e_t *pml1_entry(pml1_t pml1, ptr_t vaddr) |
48 | { |
49 | return &pml1.table[pml1_index(vaddr)]; |
50 | } |
51 | |
52 | bool pml1e_is_present(const pml1e_t *pml1e) |
53 | { |
54 | return platform_pml1e_get_present(pml1: pml1e); |
55 | } |
56 | |
57 | pfn_t pml1e_get_pfn(const pml1e_t *pml1e) |
58 | { |
59 | return platform_pml1e_get_pfn(pml1: pml1e); |
60 | } |
61 | |