arm64: MMU initialisation
This patch contains the initialisation of the memory blocks, MMU
attributes and the memory map. Only five memory types are defined:
Device nGnRnE (equivalent to Strongly Ordered), Device nGnRE (classic
Device memory), Device GRE, Normal Non-cacheable and Normal Cacheable.
Cache policies are supported via the memory attributes register
(MAIR_EL1) and only affect the Normal Cacheable mappings.
This patch also adds the SPARSEMEM_VMEMMAP initialisation.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
new file mode 100644
index 0000000..5f719ba
--- /dev/null
+++ b/arch/arm64/mm/init.c
@@ -0,0 +1,437 @@
+/*
+ * Based on arch/arm/mm/init.c
+ *
+ * Copyright (C) 1995-2005 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/initrd.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/sort.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/sizes.h>
+#include <asm/tlb.h>
+
+#include "mm.h"
+
+static unsigned long phys_initrd_start __initdata = 0;
+static unsigned long phys_initrd_size __initdata = 0;
+
+phys_addr_t memstart_addr __read_mostly = 0;
+
+void __init early_init_dt_setup_initrd_arch(unsigned long start,
+ unsigned long end)
+{
+ phys_initrd_start = start;
+ phys_initrd_size = end - start;
+}
+
+static int __init early_initrd(char *p)
+{
+ unsigned long start, size;
+ char *endp;
+
+ start = memparse(p, &endp);
+ if (*endp == ',') {
+ size = memparse(endp + 1, NULL);
+
+ phys_initrd_start = start;
+ phys_initrd_size = size;
+ }
+ return 0;
+}
+early_param("initrd", early_initrd);
+
+#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
+
+static void __init zone_sizes_init(unsigned long min, unsigned long max)
+{
+ struct memblock_region *reg;
+ unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
+ unsigned long max_dma32 = min;
+
+ memset(zone_size, 0, sizeof(zone_size));
+
+#ifdef CONFIG_ZONE_DMA32
+ /* 4GB maximum for 32-bit only capable devices */
+ max_dma32 = min(max, MAX_DMA32_PFN);
+ zone_size[ZONE_DMA32] = max_dma32 - min;
+#endif
+ zone_size[ZONE_NORMAL] = max - max_dma32;
+
+ memcpy(zhole_size, zone_size, sizeof(zhole_size));
+
+ for_each_memblock(memory, reg) {
+ unsigned long start = memblock_region_memory_base_pfn(reg);
+ unsigned long end = memblock_region_memory_end_pfn(reg);
+
+ if (start >= max)
+ continue;
+#ifdef CONFIG_ZONE_DMA32
+ if (start < max_dma32) {
+ unsigned long dma_end = min(end, max_dma32);
+ zhole_size[ZONE_DMA32] -= dma_end - start;
+ }
+#endif
+ if (end > max_dma32) {
+ unsigned long normal_end = min(end, max);
+ unsigned long normal_start = max(start, max_dma32);
+ zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
+ }
+ }
+
+ free_area_init_node(0, zone_size, min, zhole_size);
+}
+
+#ifdef CONFIG_HAVE_ARCH_PFN_VALID
+int pfn_valid(unsigned long pfn)
+{
+ return memblock_is_memory(pfn << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(pfn_valid);
+#endif
+
+#ifndef CONFIG_SPARSEMEM
+static void arm64_memory_present(void)
+{
+}
+#else
+static void arm64_memory_present(void)
+{
+ struct memblock_region *reg;
+
+ for_each_memblock(memory, reg)
+ memory_present(0, memblock_region_memory_base_pfn(reg),
+ memblock_region_memory_end_pfn(reg));
+}
+#endif
+
+void __init arm64_memblock_init(void)
+{
+ u64 *reserve_map, base, size;
+
+ /* Register the kernel text, kernel data and initrd with memblock */
+ memblock_reserve(__pa(_text), _end - _text);
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (phys_initrd_size) {
+ memblock_reserve(phys_initrd_start, phys_initrd_size);
+
+ /* Now convert initrd to virtual addresses */
+ initrd_start = __phys_to_virt(phys_initrd_start);
+ initrd_end = initrd_start + phys_initrd_size;
+ }
+#endif
+
+ /*
+ * Reserve the page tables. These are already in use,
+ * and can only be in node 0.
+ */
+ memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
+ memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
+
+ /* Reserve the dtb region */
+ memblock_reserve(virt_to_phys(initial_boot_params),
+ be32_to_cpu(initial_boot_params->totalsize));
+
+ /*
+ * Process the reserve map. This will probably overlap the initrd
+ * and dtb locations which are already reserved, but overlapping
+ * doesn't hurt anything
+ */
+ reserve_map = ((void*)initial_boot_params) +
+ be32_to_cpu(initial_boot_params->off_mem_rsvmap);
+ while (1) {
+ base = be64_to_cpup(reserve_map++);
+ size = be64_to_cpup(reserve_map++);
+ if (!size)
+ break;
+ memblock_reserve(base, size);
+ }
+
+ memblock_allow_resize();
+ memblock_dump_all();
+}
+
+void __init bootmem_init(void)
+{
+ unsigned long min, max;
+
+ min = PFN_UP(memblock_start_of_DRAM());
+ max = PFN_DOWN(memblock_end_of_DRAM());
+
+ /*
+ * Sparsemem tries to allocate bootmem in memory_present(), so must be
+ * done after the fixed reservations.
+ */
+ arm64_memory_present();
+
+ sparse_init();
+ zone_sizes_init(min, max);
+
+ high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
+ max_pfn = max_low_pfn = max;
+}
+
+static inline int free_area(unsigned long pfn, unsigned long end, char *s)
+{
+ unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
+
+ for (; pfn < end; pfn++) {
+ struct page *page = pfn_to_page(pfn);
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ pages++;
+ }
+
+ if (size && s)
+ pr_info("Freeing %s memory: %dK\n", s, size);
+
+ return pages;
+}
+
+/*
+ * Poison init memory with an undefined instruction (0x0).
+ */
+static inline void poison_init_mem(void *s, size_t count)
+{
+ memset(s, 0, count);
+}
+
+#ifndef CONFIG_SPARSEMEM_VMEMMAP
+static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
+{
+ struct page *start_pg, *end_pg;
+ unsigned long pg, pgend;
+
+ /*
+ * Convert start_pfn/end_pfn to a struct page pointer.
+ */
+ start_pg = pfn_to_page(start_pfn - 1) + 1;
+ end_pg = pfn_to_page(end_pfn - 1) + 1;
+
+ /*
+ * Convert to physical addresses, and round start upwards and end
+ * downwards.
+ */
+ pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
+ pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
+
+ /*
+ * If there are free pages between these, free the section of the
+ * memmap array.
+ */
+ if (pg < pgend)
+ free_bootmem(pg, pgend - pg);
+}
+
+/*
+ * The mem_map array can get very big. Free the unused area of the memory map.
+ */
+static void __init free_unused_memmap(void)
+{
+ unsigned long start, prev_end = 0;
+ struct memblock_region *reg;
+
+ for_each_memblock(memory, reg) {
+ start = __phys_to_pfn(reg->base);
+
+#ifdef CONFIG_SPARSEMEM
+ /*
+ * Take care not to free memmap entries that don't exist due
+ * to SPARSEMEM sections which aren't present.
+ */
+ start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
+#endif
+ /*
+ * If we had a previous bank, and there is a space between the
+ * current bank and the previous, free it.
+ */
+ if (prev_end && prev_end < start)
+ free_memmap(prev_end, start);
+
+ /*
+ * Align up here since the VM subsystem insists that the
+ * memmap entries are valid from the bank end aligned to
+ * MAX_ORDER_NR_PAGES.
+ */
+ prev_end = ALIGN(start + __phys_to_pfn(reg->size),
+ MAX_ORDER_NR_PAGES);
+ }
+
+#ifdef CONFIG_SPARSEMEM
+ if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
+ free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
+#endif
+}
+#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
+
+/*
+ * mem_init() marks the free areas in the mem_map and tells us how much memory
+ * is free. This is done after various parts of the system have claimed their
+ * memory after the kernel image.
+ */
+void __init mem_init(void)
+{
+ unsigned long reserved_pages, free_pages;
+ struct memblock_region *reg;
+
+#if CONFIG_SWIOTLB
+ extern void __init arm64_swiotlb_init(size_t max_size);
+ arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
+#endif
+
+ max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
+
+#ifndef CONFIG_SPARSEMEM_VMEMMAP
+ /* this will put all unused low memory onto the freelists */
+ free_unused_memmap();
+#endif
+
+ totalram_pages += free_all_bootmem();
+
+ reserved_pages = free_pages = 0;
+
+ for_each_memblock(memory, reg) {
+ unsigned int pfn1, pfn2;
+ struct page *page, *end;
+
+ pfn1 = __phys_to_pfn(reg->base);
+ pfn2 = pfn1 + __phys_to_pfn(reg->size);
+
+ page = pfn_to_page(pfn1);
+ end = pfn_to_page(pfn2 - 1) + 1;
+
+ do {
+ if (PageReserved(page))
+ reserved_pages++;
+ else if (!page_count(page))
+ free_pages++;
+ page++;
+ } while (page < end);
+ }
+
+ /*
+ * Since our memory may not be contiguous, calculate the real number
+ * of pages we have in this system.
+ */
+ pr_info("Memory:");
+ num_physpages = 0;
+ for_each_memblock(memory, reg) {
+ unsigned long pages = memblock_region_memory_end_pfn(reg) -
+ memblock_region_memory_base_pfn(reg);
+ num_physpages += pages;
+ printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
+ }
+ printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
+
+ pr_notice("Memory: %luk/%luk available, %luk reserved\n",
+ nr_free_pages() << (PAGE_SHIFT-10),
+ free_pages << (PAGE_SHIFT-10),
+ reserved_pages << (PAGE_SHIFT-10));
+
+#define MLK(b, t) b, t, ((t) - (b)) >> 10
+#define MLM(b, t) b, t, ((t) - (b)) >> 20
+#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
+
+ pr_notice("Virtual kernel memory layout:\n"
+ " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
+#endif
+ " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
+ " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
+ " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
+ " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
+ " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
+ MLM(VMALLOC_START, VMALLOC_END),
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ MLM((unsigned long)virt_to_page(PAGE_OFFSET),
+ (unsigned long)virt_to_page(high_memory)),
+#endif
+ MLM(MODULES_VADDR, MODULES_END),
+ MLM(PAGE_OFFSET, (unsigned long)high_memory),
+
+ MLK_ROUNDUP(__init_begin, __init_end),
+ MLK_ROUNDUP(_text, _etext),
+ MLK_ROUNDUP(_sdata, _edata));
+
+#undef MLK
+#undef MLM
+#undef MLK_ROUNDUP
+
+ /*
+ * Check boundaries twice: Some fundamental inconsistencies can be
+ * detected at build time already.
+ */
+#ifdef CONFIG_COMPAT
+ BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
+#endif
+ BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
+ BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
+
+ if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
+ extern int sysctl_overcommit_memory;
+ /*
+ * On a machine this small we won't get anywhere without
+ * overcommit, so turn it on by default.
+ */
+ sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
+ }
+}
+
+void free_initmem(void)
+{
+ poison_init_mem(__init_begin, __init_end - __init_begin);
+ totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
+ __phys_to_pfn(__pa(__init_end)),
+ "init");
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int keep_initrd;
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ if (!keep_initrd) {
+ poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
+ totalram_pages += free_area(__phys_to_pfn(__pa(start)),
+ __phys_to_pfn(__pa(end)),
+ "initrd");
+ }
+}
+
+static int __init keepinitrd_setup(char *__unused)
+{
+ keep_initrd = 1;
+ return 1;
+}
+
+__setup("keepinitrd", keepinitrd_setup);
+#endif