1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/pgtable.h>
4 #include <asm/abs_lowcore.h>
5
6 unsigned long __bootdata_preserved(__abs_lowcore);
7 int __bootdata_preserved(relocate_lowcore);
8
9 int abs_lowcore_map(int cpu, struct lowcore *lc, bool alloc)
10 {
11 unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
12 unsigned long phys = __pa(lc);
13 int rc, i;
14
15 for (i = 0; i < LC_PAGES; i++) {
16 rc = __vmem_map_4k_page(addr, phys, PAGE_KERNEL, alloc);
17 if (rc) {
18 /*
19 * Do not unmap allocated page tables in case the
20 * allocation was not requested. In such a case the
21 * request is expected coming from an atomic context,
22 * while the unmap attempt might sleep.
23 */
24 if (alloc) {
25 for (--i; i >= 0; i--) {
26 addr -= PAGE_SIZE;
27 vmem_unmap_4k_page(addr);
28 }
29 }
30 return rc;
31 }
32 addr += PAGE_SIZE;
33 phys += PAGE_SIZE;
34 }
35 return 0;
36 }
37
38 void abs_lowcore_unmap(int cpu)
39 {
40 unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
41 int i;
42
43 for (i = 0; i < LC_PAGES; i++) {
44 vmem_unmap_4k_page(addr);
45 addr += PAGE_SIZE;
46 }
47 }
48
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