mmu.c (0bf757c73d6612d3d279de3f61b35062aa9c8b1d) mmu.c (bf4b558eba920a38f91beb5ee62a8ce2628c92f7)
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

--- 246 unchanged lines hidden (view full) ---

255 end = addr + length;
256 do {
257 next = pgd_addr_end(addr, end);
258 alloc_init_pud(pgd, addr, next, phys);
259 phys += next - addr;
260 } while (pgd++, addr = next, addr != end);
261}
262
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

--- 246 unchanged lines hidden (view full) ---

255 end = addr + length;
256 do {
257 next = pgd_addr_end(addr, end);
258 alloc_init_pud(pgd, addr, next, phys);
259 phys += next - addr;
260 } while (pgd++, addr = next, addr != end);
261}
262
263#ifdef CONFIG_EARLY_PRINTK
264/*
265 * Create an early I/O mapping using the pgd/pmd entries already populated
266 * in head.S as this function is called too early to allocated any memory. The
267 * mapping size is 2MB with 4KB pages or 64KB or 64KB pages.
268 */
269void __iomem * __init early_io_map(phys_addr_t phys, unsigned long virt)
270{
271 unsigned long size, mask;
272 bool page64k = IS_ENABLED(CONFIG_ARM64_64K_PAGES);
273 pgd_t *pgd;
274 pud_t *pud;
275 pmd_t *pmd;
276 pte_t *pte;
277
278 /*
279 * No early pte entries with !ARM64_64K_PAGES configuration, so using
280 * sections (pmd).
281 */
282 size = page64k ? PAGE_SIZE : SECTION_SIZE;
283 mask = ~(size - 1);
284
285 pgd = pgd_offset_k(virt);
286 pud = pud_offset(pgd, virt);
287 if (pud_none(*pud))
288 return NULL;
289 pmd = pmd_offset(pud, virt);
290
291 if (page64k) {
292 if (pmd_none(*pmd))
293 return NULL;
294 pte = pte_offset_kernel(pmd, virt);
295 set_pte(pte, __pte((phys & mask) | PROT_DEVICE_nGnRE));
296 } else {
297 set_pmd(pmd, __pmd((phys & mask) | PROT_SECT_DEVICE_nGnRE));
298 }
299
300 return (void __iomem *)((virt & mask) + (phys & ~mask));
301}
302#endif
303
304static void __init map_mem(void)
305{
306 struct memblock_region *reg;
307 phys_addr_t limit;
308
309 /*
310 * Temporarily limit the memblock range. We need to do this as
311 * create_mapping requires puds, pmds and ptes to be allocated from

--- 158 unchanged lines hidden --- 		263static void __init map_mem(void)
264{
265 struct memblock_region *reg;
266 phys_addr_t limit;
267
268 /*
269 * Temporarily limit the memblock range. We need to do this as
270 * create_mapping requires puds, pmds and ptes to be allocated from

--- 158 unchanged lines hidden ---