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-rw-r--r--arch/metag/mm/init.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
new file mode 100644
index 000000000000..504a398d5f8b
--- /dev/null
+++ b/arch/metag/mm/init.c
@@ -0,0 +1,451 @@
+/*
+ * Copyright (C) 2005,2006,2007,2008,2009,2010 Imagination Technologies
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/pagemap.h>
+#include <linux/percpu.h>
+#include <linux/memblock.h>
+#include <linux/initrd.h>
+#include <linux/of_fdt.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/user_gateway.h>
+#include <asm/mmzone.h>
+#include <asm/fixmap.h>
+
+unsigned long pfn_base;
+EXPORT_SYMBOL(pfn_base);
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data;
+
+unsigned long empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
+
+extern char __user_gateway_start;
+extern char __user_gateway_end;
+
+void *gateway_page;
+
+/*
+ * Insert the gateway page into a set of page tables, creating the
+ * page tables if necessary.
+ */
+static void insert_gateway_page(pgd_t *pgd, unsigned long address)
+{
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ BUG_ON(!pgd_present(*pgd));
+
+ pud = pud_offset(pgd, address);
+ BUG_ON(!pud_present(*pud));
+
+ pmd = pmd_offset(pud, address);
+ if (!pmd_present(*pmd)) {
+ pte = alloc_bootmem_pages(PAGE_SIZE);
+ set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)));
+ }
+
+ pte = pte_offset_kernel(pmd, address);
+ set_pte(pte, pfn_pte(__pa(gateway_page) >> PAGE_SHIFT, PAGE_READONLY));
+}
+
+/* Alloc and map a page in a known location accessible to userspace. */
+static void __init user_gateway_init(void)
+{
+ unsigned long address = USER_GATEWAY_PAGE;
+ int offset = pgd_index(address);
+ pgd_t *pgd;
+
+ gateway_page = alloc_bootmem_pages(PAGE_SIZE);
+
+ pgd = swapper_pg_dir + offset;
+ insert_gateway_page(pgd, address);
+
+#ifdef CONFIG_METAG_META12
+ /*
+ * Insert the gateway page into our current page tables even
+ * though we've already inserted it into our reference page
+ * table (swapper_pg_dir). This is because with a META1 mmu we
+ * copy just the user address range and not the gateway page
+ * entry on context switch, see switch_mmu().
+ */
+ pgd = (pgd_t *)mmu_get_base() + offset;
+ insert_gateway_page(pgd, address);
+#endif /* CONFIG_METAG_META12 */
+
+ BUG_ON((&__user_gateway_end - &__user_gateway_start) > PAGE_SIZE);
+
+ gateway_page += (address & ~PAGE_MASK);
+
+ memcpy(gateway_page, &__user_gateway_start,
+ &__user_gateway_end - &__user_gateway_start);
+
+ /*
+ * We don't need to flush the TLB here, there should be no mapping
+ * present at boot for this address and only valid mappings are in
+ * the TLB (apart from on Meta 1.x, but those cached invalid
+ * mappings should be impossible to hit here).
+ *
+ * We don't flush the code cache here even though we have written
+ * code through the data cache and they may not be coherent. At
+ * this point we assume there is no stale data in the code cache
+ * for this address so there is no need to flush.
+ */
+}
+
+static void __init allocate_pgdat(unsigned int nid)
+{
+ unsigned long start_pfn, end_pfn;
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ unsigned long phys;
+#endif
+
+ get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ phys = __memblock_alloc_base(sizeof(struct pglist_data),
+ SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
+ /* Retry with all of system memory */
+ if (!phys)
+ phys = __memblock_alloc_base(sizeof(struct pglist_data),
+ SMP_CACHE_BYTES,
+ memblock_end_of_DRAM());
+ if (!phys)
+ panic("Can't allocate pgdat for node %d\n", nid);
+
+ NODE_DATA(nid) = __va(phys);
+ memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
+
+ NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
+#endif
+
+ NODE_DATA(nid)->node_start_pfn = start_pfn;
+ NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
+}
+
+static void __init bootmem_init_one_node(unsigned int nid)
+{
+ unsigned long total_pages, paddr;
+ unsigned long end_pfn;
+ struct pglist_data *p;
+
+ p = NODE_DATA(nid);
+
+ /* Nothing to do.. */
+ if (!p->node_spanned_pages)
+ return;
+
+ end_pfn = p->node_start_pfn + p->node_spanned_pages;
+#ifdef CONFIG_HIGHMEM
+ if (end_pfn > max_low_pfn)
+ end_pfn = max_low_pfn;
+#endif
+
+ total_pages = bootmem_bootmap_pages(end_pfn - p->node_start_pfn);
+
+ paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
+ if (!paddr)
+ panic("Can't allocate bootmap for nid[%d]\n", nid);
+
+ init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
+
+ free_bootmem_with_active_regions(nid, end_pfn);
+
+ /*
+ * XXX Handle initial reservations for the system memory node
+ * only for the moment, we'll refactor this later for handling
+ * reservations in other nodes.
+ */
+ if (nid == 0) {
+ struct memblock_region *reg;
+
+ /* Reserve the sections we're already using. */
+ for_each_memblock(reserved, reg) {
+ unsigned long size = reg->size;
+
+#ifdef CONFIG_HIGHMEM
+ /* ...but not highmem */
+ if (PFN_DOWN(reg->base) >= highstart_pfn)
+ continue;
+
+ if (PFN_UP(reg->base + size) > highstart_pfn)
+ size = (highstart_pfn - PFN_DOWN(reg->base))
+ << PAGE_SHIFT;
+#endif
+
+ reserve_bootmem(reg->base, size, BOOTMEM_DEFAULT);
+ }
+ }
+
+ sparse_memory_present_with_active_regions(nid);
+}
+
+static void __init do_init_bootmem(void)
+{
+ struct memblock_region *reg;
+ int i;
+
+ /* Add active regions with valid PFNs. */
+ for_each_memblock(memory, reg) {
+ unsigned long start_pfn, end_pfn;
+ start_pfn = memblock_region_memory_base_pfn(reg);
+ end_pfn = memblock_region_memory_end_pfn(reg);
+ memblock_set_node(PFN_PHYS(start_pfn),
+ PFN_PHYS(end_pfn - start_pfn), 0);
+ }
+
+ /* All of system RAM sits in node 0 for the non-NUMA case */
+ allocate_pgdat(0);
+ node_set_online(0);
+
+ soc_mem_setup();
+
+ for_each_online_node(i)
+ bootmem_init_one_node(i);
+
+ sparse_init();
+}
+
+extern char _heap_start[];
+
+static void __init init_and_reserve_mem(void)
+{
+ unsigned long start_pfn, heap_start;
+ u64 base = min_low_pfn << PAGE_SHIFT;
+ u64 size = (max_low_pfn << PAGE_SHIFT) - base;
+
+ heap_start = (unsigned long) &_heap_start;
+
+ memblock_add(base, size);
+
+ /*
+ * Partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ start_pfn = PFN_UP(__pa(heap_start));
+
+ /*
+ * Reserve the kernel text.
+ */
+ memblock_reserve(base, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - base);
+
+#ifdef CONFIG_HIGHMEM
+ /*
+ * Add & reserve highmem, so page structures are initialised.
+ */
+ base = highstart_pfn << PAGE_SHIFT;
+ size = (highend_pfn << PAGE_SHIFT) - base;
+ if (size) {
+ memblock_add(base, size);
+ memblock_reserve(base, size);
+ }
+#endif
+}
+
+#ifdef CONFIG_HIGHMEM
+/*
+ * Ensure we have allocated page tables in swapper_pg_dir for the
+ * fixed mappings range from 'start' to 'end'.
+ */
+static void __init allocate_pgtables(unsigned long start, unsigned long end)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = pgd_index(vaddr);
+ j = pmd_index(vaddr);
+ pgd = swapper_pg_dir + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+ pmd = (pmd_t *)pgd;
+ for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
+ vaddr += PMD_SIZE;
+
+ if (!pmd_none(*pmd))
+ continue;
+
+ pte = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pmd, pte);
+ }
+ j = 0;
+ }
+}
+
+static void __init fixedrange_init(void)
+{
+ unsigned long vaddr, end;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ /*
+ * Fixed mappings:
+ */
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
+ allocate_pgtables(vaddr, end);
+
+ /*
+ * Permanent kmaps:
+ */
+ vaddr = PKMAP_BASE;
+ allocate_pgtables(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP);
+
+ pgd = swapper_pg_dir + pgd_index(vaddr);
+ pud = pud_offset(pgd, vaddr);
+ pmd = pmd_offset(pud, vaddr);
+ pte = pte_offset_kernel(pmd, vaddr);
+ pkmap_page_table = pte;
+}
+#endif /* CONFIG_HIGHMEM */
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/metag/kernel/setup.c.
+ */
+void __init paging_init(unsigned long mem_end)
+{
+ unsigned long max_zone_pfns[MAX_NR_ZONES];
+ int nid;
+
+ init_and_reserve_mem();
+
+ memblock_allow_resize();
+
+ memblock_dump_all();
+
+ nodes_clear(node_online_map);
+
+ init_new_context(&init_task, &init_mm);
+
+ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
+
+ do_init_bootmem();
+ mmu_init(mem_end);
+
+#ifdef CONFIG_HIGHMEM
+ fixedrange_init();
+ kmap_init();
+#endif
+
+ /* Initialize the zero page to a bootmem page, already zeroed. */
+ empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+
+ user_gateway_init();
+
+ memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
+ unsigned long low, start_pfn;
+
+ start_pfn = pgdat->bdata->node_min_pfn;
+ low = pgdat->bdata->node_low_pfn;
+
+ if (max_zone_pfns[ZONE_NORMAL] < low)
+ max_zone_pfns[ZONE_NORMAL] = low;
+
+#ifdef CONFIG_HIGHMEM
+ max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
+#endif
+ pr_info("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
+ nid, start_pfn, low);
+ }
+
+ free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+ int nid;
+
+#ifdef CONFIG_HIGHMEM
+ unsigned long tmp;
+ for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
+ struct page *page = pfn_to_page(tmp);
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ totalhigh_pages++;
+ }
+ totalram_pages += totalhigh_pages;
+ num_physpages += totalhigh_pages;
+#endif /* CONFIG_HIGHMEM */
+
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
+ unsigned long node_pages = 0;
+
+ num_physpages += pgdat->node_present_pages;
+
+ if (pgdat->node_spanned_pages)
+ node_pages = free_all_bootmem_node(pgdat);
+
+ totalram_pages += node_pages;
+ }
+
+ pr_info("Memory: %luk/%luk available\n",
+ (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
+ num_physpages << (PAGE_SHIFT - 10));
+
+ show_mem(0);
+
+ return;
+}
+
+static void free_init_pages(char *what, unsigned long begin, unsigned long end)
+{
+ unsigned long addr;
+
+ for (addr = begin; addr < end; addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ init_page_count(virt_to_page(addr));
+ memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
+ free_page(addr);
+ totalram_pages++;
+ }
+ pr_info("Freeing %s: %luk freed\n", what, (end - begin) >> 10);
+}
+
+void free_initmem(void)
+{
+ free_init_pages("unused kernel memory",
+ (unsigned long)(&__init_begin),
+ (unsigned long)(&__init_end));
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ end = end & PAGE_MASK;
+ free_init_pages("initrd memory", start, end);
+}
+#endif
+
+#ifdef CONFIG_OF_FLATTREE
+void __init early_init_dt_setup_initrd_arch(unsigned long start,
+ unsigned long end)
+{
+ pr_err("%s(%lx, %lx)\n",
+ __func__, start, end);
+}
+#endif /* CONFIG_OF_FLATTREE */