mmu.c (cf9ce948f47640797bd19980e1d99c6d17d0bdc3) mmu.c (2475ff9d2c6ea3bbfed55c4635426c371f9ad327)
1/*
2 * Based on arch/arm/mm/mmu.c
3 *
4 * Copyright (C) 1995-2005 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as

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20#include <linux/export.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/init.h>
24#include <linux/mman.h>
25#include <linux/nodemask.h>
26#include <linux/memblock.h>
27#include <linux/fs.h>
1/*
2 * Based on arch/arm/mm/mmu.c
3 *
4 * Copyright (C) 1995-2005 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as

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20#include <linux/export.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/init.h>
24#include <linux/mman.h>
25#include <linux/nodemask.h>
26#include <linux/memblock.h>
27#include <linux/fs.h>
28#include <linux/io.h>
28
29#include <asm/cputype.h>
30#include <asm/sections.h>
31#include <asm/setup.h>
32#include <asm/sizes.h>
33#include <asm/tlb.h>
34#include <asm/mmu_context.h>
35

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246 end = addr + length;
247 do {
248 next = pgd_addr_end(addr, end);
249 alloc_init_pud(pgd, addr, next, phys);
250 phys += next - addr;
251 } while (pgd++, addr = next, addr != end);
252}
253
29
30#include <asm/cputype.h>
31#include <asm/sections.h>
32#include <asm/setup.h>
33#include <asm/sizes.h>
34#include <asm/tlb.h>
35#include <asm/mmu_context.h>
36

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247 end = addr + length;
248 do {
249 next = pgd_addr_end(addr, end);
250 alloc_init_pud(pgd, addr, next, phys);
251 phys += next - addr;
252 } while (pgd++, addr = next, addr != end);
253}
254
255#ifdef CONFIG_EARLY_PRINTK
256/*
257 * Create an early I/O mapping using the pgd/pmd entries already populated
258 * in head.S as this function is called too early to allocated any memory. The
259 * mapping size is 2MB with 4KB pages or 64KB or 64KB pages.
260 */
261void __iomem * __init early_io_map(phys_addr_t phys, unsigned long virt)
262{
263 unsigned long size, mask;
264 bool page64k = IS_ENABLED(ARM64_64K_PAGES);
265 pgd_t *pgd;
266 pud_t *pud;
267 pmd_t *pmd;
268 pte_t *pte;
269
270 /*
271 * No early pte entries with !ARM64_64K_PAGES configuration, so using
272 * sections (pmd).
273 */
274 size = page64k ? PAGE_SIZE : SECTION_SIZE;
275 mask = ~(size - 1);
276
277 pgd = pgd_offset_k(virt);
278 pud = pud_offset(pgd, virt);
279 if (pud_none(*pud))
280 return NULL;
281 pmd = pmd_offset(pud, virt);
282
283 if (page64k) {
284 if (pmd_none(*pmd))
285 return NULL;
286 pte = pte_offset_kernel(pmd, virt);
287 set_pte(pte, __pte((phys & mask) | PROT_DEVICE_nGnRE));
288 } else {
289 set_pmd(pmd, __pmd((phys & mask) | PROT_SECT_DEVICE_nGnRE));
290 }
291
292 return (void __iomem *)((virt & mask) + (phys & ~mask));
293}
294#endif
295
254static void __init map_mem(void)
255{
256 struct memblock_region *reg;
257
258 /* map all the memory banks */
259 for_each_memblock(memory, reg) {
260 phys_addr_t start = reg->base;
261 phys_addr_t end = start + reg->size;

--- 134 unchanged lines hidden --- 		296static void __init map_mem(void)
297{
298 struct memblock_region *reg;
299
300 /* map all the memory banks */
301 for_each_memblock(memory, reg) {
302 phys_addr_t start = reg->base;
303 phys_addr_t end = start + reg->size;

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