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