1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2020 Google LLC 4*4882a593Smuzhiyun * Author: Quentin Perret <qperret@google.com> 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <asm/kvm_pgtable.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <nvhe/early_alloc.h> 10*4882a593Smuzhiyun #include <nvhe/memory.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops; 13*4882a593Smuzhiyun s64 __ro_after_init hyp_physvirt_offset; 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun static unsigned long base; 16*4882a593Smuzhiyun static unsigned long end; 17*4882a593Smuzhiyun static unsigned long cur; 18*4882a593Smuzhiyun hyp_early_alloc_nr_used_pages(void)19*4882a593Smuzhiyununsigned long hyp_early_alloc_nr_used_pages(void) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun return (cur - base) >> PAGE_SHIFT; 22*4882a593Smuzhiyun } 23*4882a593Smuzhiyun hyp_early_alloc_contig(unsigned int nr_pages)24*4882a593Smuzhiyunvoid *hyp_early_alloc_contig(unsigned int nr_pages) 25*4882a593Smuzhiyun { 26*4882a593Smuzhiyun unsigned long size = (nr_pages << PAGE_SHIFT); 27*4882a593Smuzhiyun void *ret = (void *)cur; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun if (!nr_pages) 30*4882a593Smuzhiyun return NULL; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun if (end - cur < size) 33*4882a593Smuzhiyun return NULL; 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun cur += size; 36*4882a593Smuzhiyun memset(ret, 0, size); 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun return ret; 39*4882a593Smuzhiyun } 40*4882a593Smuzhiyun hyp_early_alloc_page(void * arg)41*4882a593Smuzhiyunvoid *hyp_early_alloc_page(void *arg) 42*4882a593Smuzhiyun { 43*4882a593Smuzhiyun return hyp_early_alloc_contig(1); 44*4882a593Smuzhiyun } 45*4882a593Smuzhiyun hyp_early_alloc_init(void * virt,unsigned long size)46*4882a593Smuzhiyunvoid hyp_early_alloc_init(void *virt, unsigned long size) 47*4882a593Smuzhiyun { 48*4882a593Smuzhiyun base = cur = (unsigned long)virt; 49*4882a593Smuzhiyun end = base + size; 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page; 52*4882a593Smuzhiyun hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt; 53*4882a593Smuzhiyun hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys; 54*4882a593Smuzhiyun } 55