| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * OpenRISC ioremap.c |
| * |
| * Linux architectural port borrowing liberally from similar works of |
| * others. All original copyrights apply as per the original source |
| * declaration. |
| * |
| * Modifications for the OpenRISC architecture: |
| * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
| * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
| */ |
| |
| #include <linux/vmalloc.h> |
| #include <linux/io.h> |
| #include <linux/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/fixmap.h> |
| #include <asm/bug.h> |
| #include <linux/sched.h> |
| #include <asm/tlbflush.h> |
| |
| extern int mem_init_done; |
| |
| /* |
| * OK, this one's a bit tricky... ioremap can get called before memory is |
| * initialized (early serial console does this) and will want to alloc a page |
| * for its mapping. No userspace pages will ever get allocated before memory |
| * is initialized so this applies only to kernel pages. In the event that |
| * this is called before memory is initialized we allocate the page using |
| * the memblock infrastructure. |
| */ |
| |
| pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm) |
| { |
| pte_t *pte; |
| |
| if (likely(mem_init_done)) { |
| pte = (pte_t *)get_zeroed_page(GFP_KERNEL); |
| } else { |
| pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
| if (!pte) |
| panic("%s: Failed to allocate %lu bytes align=0x%lx\n", |
| __func__, PAGE_SIZE, PAGE_SIZE); |
| } |
| |
| return pte; |
| } |