early_alloc.c (1331B)
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 12struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops; 13s64 __ro_after_init hyp_physvirt_offset; 14 15static unsigned long base; 16static unsigned long end; 17static unsigned long cur; 18 19unsigned long hyp_early_alloc_nr_used_pages(void) 20{ 21 return (cur - base) >> PAGE_SHIFT; 22} 23 24void *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 41void *hyp_early_alloc_page(void *arg) 42{ 43 return hyp_early_alloc_contig(1); 44} 45 46static void hyp_early_alloc_get_page(void *addr) { } 47static void hyp_early_alloc_put_page(void *addr) { } 48 49void 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}