47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/pgtable.h>
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#include <asm/abs_lowcore.h>
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unsigned long __bootdata_preserved(__abs_lowcore);
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int abs_lowcore_map(int cpu, struct lowcore *lc, bool alloc)
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{
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unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
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unsigned long phys = __pa(lc);
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int rc, i;
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for (i = 0; i < LC_PAGES; i++) {
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rc = __vmem_map_4k_page(addr, phys, PAGE_KERNEL, alloc);
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if (rc) {
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/*
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* Do not unmap allocated page tables in case the
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* allocation was not requested. In such a case the
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* request is expected coming from an atomic context,
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* while the unmap attempt might sleep.
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*/
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if (alloc) {
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for (--i; i >= 0; i--) {
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addr -= PAGE_SIZE;
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vmem_unmap_4k_page(addr);
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}
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}
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return rc;
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}
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addr += PAGE_SIZE;
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phys += PAGE_SIZE;
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}
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return 0;
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}
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void abs_lowcore_unmap(int cpu)
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{
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unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
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int i;
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for (i = 0; i < LC_PAGES; i++) {
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vmem_unmap_4k_page(addr);
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addr += PAGE_SIZE;
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}
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}
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