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-rw-r--r--kernel/arch/s390/mm/init.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/kernel/arch/s390/mm/init.c b/kernel/arch/s390/mm/init.c
new file mode 100644
index 000000000..80875c43a
--- /dev/null
+++ b/kernel/arch/s390/mm/init.c
@@ -0,0 +1,230 @@
+/*
+ * S390 version
+ * Copyright IBM Corp. 1999
+ * Author(s): Hartmut Penner (hp@de.ibm.com)
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1995 Linus Torvalds
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/memory.h>
+#include <linux/pfn.h>
+#include <linux/poison.h>
+#include <linux/initrd.h>
+#include <linux/export.h>
+#include <linux/gfp.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/dma.h>
+#include <asm/lowcore.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/sections.h>
+#include <asm/ctl_reg.h>
+#include <asm/sclp.h>
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
+
+unsigned long empty_zero_page, zero_page_mask;
+EXPORT_SYMBOL(empty_zero_page);
+EXPORT_SYMBOL(zero_page_mask);
+
+static void __init setup_zero_pages(void)
+{
+ struct cpuid cpu_id;
+ unsigned int order;
+ struct page *page;
+ int i;
+
+ get_cpu_id(&cpu_id);
+ switch (cpu_id.machine) {
+ case 0x9672: /* g5 */
+ case 0x2064: /* z900 */
+ case 0x2066: /* z900 */
+ case 0x2084: /* z990 */
+ case 0x2086: /* z990 */
+ case 0x2094: /* z9-109 */
+ case 0x2096: /* z9-109 */
+ order = 0;
+ break;
+ case 0x2097: /* z10 */
+ case 0x2098: /* z10 */
+ case 0x2817: /* z196 */
+ case 0x2818: /* z196 */
+ order = 2;
+ break;
+ case 0x2827: /* zEC12 */
+ case 0x2828: /* zEC12 */
+ order = 5;
+ break;
+ case 0x2964: /* z13 */
+ default:
+ order = 7;
+ break;
+ }
+ /* Limit number of empty zero pages for small memory sizes */
+ while (order > 2 && (totalram_pages >> 10) < (1UL << order))
+ order--;
+
+ empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!empty_zero_page)
+ panic("Out of memory in setup_zero_pages");
+
+ page = virt_to_page((void *) empty_zero_page);
+ split_page(page, order);
+ for (i = 1 << order; i > 0; i--) {
+ mark_page_reserved(page);
+ page++;
+ }
+
+ zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
+}
+
+/*
+ * paging_init() sets up the page tables
+ */
+void __init paging_init(void)
+{
+ unsigned long max_zone_pfns[MAX_NR_ZONES];
+ unsigned long pgd_type, asce_bits;
+
+ init_mm.pgd = swapper_pg_dir;
+ if (VMALLOC_END > (1UL << 42)) {
+ asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
+ pgd_type = _REGION2_ENTRY_EMPTY;
+ } else {
+ asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
+ pgd_type = _REGION3_ENTRY_EMPTY;
+ }
+ S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
+ clear_table((unsigned long *) init_mm.pgd, pgd_type,
+ sizeof(unsigned long)*2048);
+ vmem_map_init();
+
+ /* enable virtual mapping in kernel mode */
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ __ctl_load(S390_lowcore.kernel_asce, 7, 7);
+ __ctl_load(S390_lowcore.kernel_asce, 13, 13);
+ arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
+
+ sparse_memory_present_with_active_regions(MAX_NUMNODES);
+ sparse_init();
+ memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+ max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
+ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+ free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+ if (MACHINE_HAS_TLB_LC)
+ cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
+ cpumask_set_cpu(0, mm_cpumask(&init_mm));
+ atomic_set(&init_mm.context.attach_count, 1);
+
+ max_mapnr = max_low_pfn;
+ high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+ /* Setup guest page hinting */
+ cmma_init();
+
+ /* this will put all low memory onto the freelists */
+ free_all_bootmem();
+ setup_zero_pages(); /* Setup zeroed pages. */
+
+ mem_init_print_info(NULL);
+ printk("Write protected kernel read-only data: %#lx - %#lx\n",
+ (unsigned long)&_stext,
+ PFN_ALIGN((unsigned long)&_eshared) - 1);
+}
+
+void free_initmem(void)
+{
+ free_initmem_default(POISON_FREE_INITMEM);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+ "initrd");
+}
+#endif
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int arch_add_memory(int nid, u64 start, u64 size)
+{
+ unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long size_pages = PFN_DOWN(size);
+ struct zone *zone;
+ int rc;
+
+ rc = vmem_add_mapping(start, size);
+ if (rc)
+ return rc;
+ for_each_zone(zone) {
+ if (zone_idx(zone) != ZONE_MOVABLE) {
+ /* Add range within existing zone limits */
+ zone_start_pfn = zone->zone_start_pfn;
+ zone_end_pfn = zone->zone_start_pfn +
+ zone->spanned_pages;
+ } else {
+ /* Add remaining range to ZONE_MOVABLE */
+ zone_start_pfn = start_pfn;
+ zone_end_pfn = start_pfn + size_pages;
+ }
+ if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
+ continue;
+ nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
+ zone_end_pfn - start_pfn : size_pages;
+ rc = __add_pages(nid, zone, start_pfn, nr_pages);
+ if (rc)
+ break;
+ start_pfn += nr_pages;
+ size_pages -= nr_pages;
+ if (!size_pages)
+ break;
+ }
+ if (rc)
+ vmem_remove_mapping(start, size);
+ return rc;
+}
+
+unsigned long memory_block_size_bytes(void)
+{
+ /*
+ * Make sure the memory block size is always greater
+ * or equal than the memory increment size.
+ */
+ return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
+}
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int arch_remove_memory(u64 start, u64 size)
+{
+ /*
+ * There is no hardware or firmware interface which could trigger a
+ * hot memory remove on s390. So there is nothing that needs to be
+ * implemented.
+ */
+ return -EBUSY;
+}
+#endif
+#endif /* CONFIG_MEMORY_HOTPLUG */