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Linux/arch/s390/mm/init.c

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  1 /*
  2  *  S390 version
  3  *    Copyright IBM Corp. 1999
  4  *    Author(s): Hartmut Penner (hp@de.ibm.com)
  5  *
  6  *  Derived from "arch/i386/mm/init.c"
  7  *    Copyright (C) 1995  Linus Torvalds
  8  */
  9 
 10 #include <linux/signal.h>
 11 #include <linux/sched.h>
 12 #include <linux/kernel.h>
 13 #include <linux/errno.h>
 14 #include <linux/string.h>
 15 #include <linux/types.h>
 16 #include <linux/ptrace.h>
 17 #include <linux/mman.h>
 18 #include <linux/mm.h>
 19 #include <linux/swap.h>
 20 #include <linux/smp.h>
 21 #include <linux/init.h>
 22 #include <linux/pagemap.h>
 23 #include <linux/bootmem.h>
 24 #include <linux/memory.h>
 25 #include <linux/pfn.h>
 26 #include <linux/poison.h>
 27 #include <linux/initrd.h>
 28 #include <linux/export.h>
 29 #include <linux/gfp.h>
 30 #include <linux/memblock.h>
 31 #include <asm/processor.h>
 32 #include <asm/uaccess.h>
 33 #include <asm/pgtable.h>
 34 #include <asm/pgalloc.h>
 35 #include <asm/dma.h>
 36 #include <asm/lowcore.h>
 37 #include <asm/tlb.h>
 38 #include <asm/tlbflush.h>
 39 #include <asm/sections.h>
 40 #include <asm/ctl_reg.h>
 41 #include <asm/sclp.h>
 42 
 43 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
 44 
 45 unsigned long empty_zero_page, zero_page_mask;
 46 EXPORT_SYMBOL(empty_zero_page);
 47 EXPORT_SYMBOL(zero_page_mask);
 48 
 49 static void __init setup_zero_pages(void)
 50 {
 51         unsigned int order;
 52         struct page *page;
 53         int i;
 54 
 55         /* Latest machines require a mapping granularity of 512KB */
 56         order = 7;
 57 
 58         /* Limit number of empty zero pages for small memory sizes */
 59         while (order > 2 && (totalram_pages >> 10) < (1UL << order))
 60                 order--;
 61 
 62         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 63         if (!empty_zero_page)
 64                 panic("Out of memory in setup_zero_pages");
 65 
 66         page = virt_to_page((void *) empty_zero_page);
 67         split_page(page, order);
 68         for (i = 1 << order; i > 0; i--) {
 69                 mark_page_reserved(page);
 70                 page++;
 71         }
 72 
 73         zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 74 }
 75 
 76 /*
 77  * paging_init() sets up the page tables
 78  */
 79 void __init paging_init(void)
 80 {
 81         unsigned long max_zone_pfns[MAX_NR_ZONES];
 82         unsigned long pgd_type, asce_bits;
 83 
 84         init_mm.pgd = swapper_pg_dir;
 85         if (VMALLOC_END > (1UL << 42)) {
 86                 asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
 87                 pgd_type = _REGION2_ENTRY_EMPTY;
 88         } else {
 89                 asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
 90                 pgd_type = _REGION3_ENTRY_EMPTY;
 91         }
 92         init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
 93         S390_lowcore.kernel_asce = init_mm.context.asce;
 94         clear_table((unsigned long *) init_mm.pgd, pgd_type,
 95                     sizeof(unsigned long)*2048);
 96         vmem_map_init();
 97 
 98         /* enable virtual mapping in kernel mode */
 99         __ctl_load(S390_lowcore.kernel_asce, 1, 1);
100         __ctl_load(S390_lowcore.kernel_asce, 7, 7);
101         __ctl_load(S390_lowcore.kernel_asce, 13, 13);
102         __arch_local_irq_stosm(0x04);
103 
104         sparse_memory_present_with_active_regions(MAX_NUMNODES);
105         sparse_init();
106         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
107         max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
108         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
109         free_area_init_nodes(max_zone_pfns);
110 }
111 
112 void mark_rodata_ro(void)
113 {
114         /* Text and rodata are already protected. Nothing to do here. */
115         pr_info("Write protecting the kernel read-only data: %luk\n",
116                 ((unsigned long)&_eshared - (unsigned long)&_stext) >> 10);
117 }
118 
119 void __init mem_init(void)
120 {
121         if (MACHINE_HAS_TLB_LC)
122                 cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
123         cpumask_set_cpu(0, mm_cpumask(&init_mm));
124         atomic_set(&init_mm.context.attach_count, 1);
125 
126         set_max_mapnr(max_low_pfn);
127         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
128 
129         /* Setup guest page hinting */
130         cmma_init();
131 
132         /* this will put all low memory onto the freelists */
133         free_all_bootmem();
134         setup_zero_pages();     /* Setup zeroed pages. */
135 
136         mem_init_print_info(NULL);
137 }
138 
139 void free_initmem(void)
140 {
141         free_initmem_default(POISON_FREE_INITMEM);
142 }
143 
144 #ifdef CONFIG_BLK_DEV_INITRD
145 void __init free_initrd_mem(unsigned long start, unsigned long end)
146 {
147         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
148                            "initrd");
149 }
150 #endif
151 
152 #ifdef CONFIG_MEMORY_HOTPLUG
153 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
154 {
155         unsigned long normal_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
156         unsigned long dma_end_pfn = PFN_DOWN(MAX_DMA_ADDRESS);
157         unsigned long start_pfn = PFN_DOWN(start);
158         unsigned long size_pages = PFN_DOWN(size);
159         unsigned long nr_pages;
160         int rc, zone_enum;
161 
162         rc = vmem_add_mapping(start, size);
163         if (rc)
164                 return rc;
165 
166         while (size_pages > 0) {
167                 if (start_pfn < dma_end_pfn) {
168                         nr_pages = (start_pfn + size_pages > dma_end_pfn) ?
169                                    dma_end_pfn - start_pfn : size_pages;
170                         zone_enum = ZONE_DMA;
171                 } else if (start_pfn < normal_end_pfn) {
172                         nr_pages = (start_pfn + size_pages > normal_end_pfn) ?
173                                    normal_end_pfn - start_pfn : size_pages;
174                         zone_enum = ZONE_NORMAL;
175                 } else {
176                         nr_pages = size_pages;
177                         zone_enum = ZONE_MOVABLE;
178                 }
179                 rc = __add_pages(nid, NODE_DATA(nid)->node_zones + zone_enum,
180                                  start_pfn, size_pages);
181                 if (rc)
182                         break;
183                 start_pfn += nr_pages;
184                 size_pages -= nr_pages;
185         }
186         if (rc)
187                 vmem_remove_mapping(start, size);
188         return rc;
189 }
190 
191 unsigned long memory_block_size_bytes(void)
192 {
193         /*
194          * Make sure the memory block size is always greater
195          * or equal than the memory increment size.
196          */
197         return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
198 }
199 
200 #ifdef CONFIG_MEMORY_HOTREMOVE
201 int arch_remove_memory(u64 start, u64 size)
202 {
203         /*
204          * There is no hardware or firmware interface which could trigger a
205          * hot memory remove on s390. So there is nothing that needs to be
206          * implemented.
207          */
208         return -EBUSY;
209 }
210 #endif
211 #endif /* CONFIG_MEMORY_HOTPLUG */
212 

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