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1/*
2 * arch/s390/mm/init.c
3 *
4 * S390 version
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 *
8 * Derived from "arch/i386/mm/init.c"
9 * Copyright (C) 1995 Linus Torvalds
10 */
11
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/ptrace.h>
19#include <linux/mman.h>
20#include <linux/mm.h>
21#include <linux/swap.h>
22#include <linux/smp.h>
23#include <linux/init.h>
24#include <linux/pagemap.h>
25#include <linux/bootmem.h>
26#include <linux/pfn.h>
27#include <linux/poison.h>
28#include <linux/initrd.h>
29#include <linux/gfp.h>
30#include <asm/processor.h>
31#include <asm/system.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
41pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
42
43unsigned long empty_zero_page, zero_page_mask;
44EXPORT_SYMBOL(empty_zero_page);
45
46static unsigned long setup_zero_pages(void)
47{
48 struct cpuid cpu_id;
49 unsigned int order;
50 unsigned long size;
51 struct page *page;
52 int i;
53
54 get_cpu_id(&cpu_id);
55 switch (cpu_id.machine) {
56 case 0x9672: /* g5 */
57 case 0x2064: /* z900 */
58 case 0x2066: /* z900 */
59 case 0x2084: /* z990 */
60 case 0x2086: /* z990 */
61 case 0x2094: /* z9-109 */
62 case 0x2096: /* z9-109 */
63 order = 0;
64 break;
65 case 0x2097: /* z10 */
66 case 0x2098: /* z10 */
67 default:
68 order = 2;
69 break;
70 }
71
72 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
73 if (!empty_zero_page)
74 panic("Out of memory in setup_zero_pages");
75
76 page = virt_to_page((void *) empty_zero_page);
77 split_page(page, order);
78 for (i = 1 << order; i > 0; i--) {
79 SetPageReserved(page);
80 page++;
81 }
82
83 size = PAGE_SIZE << order;
84 zero_page_mask = (size - 1) & PAGE_MASK;
85
86 return 1UL << order;
87}
88
89/*
90 * paging_init() sets up the page tables
91 */
92void __init paging_init(void)
93{
94 unsigned long max_zone_pfns[MAX_NR_ZONES];
95 unsigned long pgd_type;
96
97 init_mm.pgd = swapper_pg_dir;
98 S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
99#ifdef CONFIG_64BIT
100 /* A three level page table (4TB) is enough for the kernel space. */
101 S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
102 pgd_type = _REGION3_ENTRY_EMPTY;
103#else
104 S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
105 pgd_type = _SEGMENT_ENTRY_EMPTY;
106#endif
107 clear_table((unsigned long *) init_mm.pgd, pgd_type,
108 sizeof(unsigned long)*2048);
109 vmem_map_init();
110
111 /* enable virtual mapping in kernel mode */
112 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
113 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
114 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
115 arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
116
117 atomic_set(&init_mm.context.attach_count, 1);
118
119 sparse_memory_present_with_active_regions(MAX_NUMNODES);
120 sparse_init();
121 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
122 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
123 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
124 free_area_init_nodes(max_zone_pfns);
125 fault_init();
126}
127
128void __init mem_init(void)
129{
130 unsigned long codesize, reservedpages, datasize, initsize;
131
132 max_mapnr = num_physpages = max_low_pfn;
133 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
134
135 /* Setup guest page hinting */
136 cmma_init();
137
138 /* this will put all low memory onto the freelists */
139 totalram_pages += free_all_bootmem();
140 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
141
142 reservedpages = 0;
143
144 codesize = (unsigned long) &_etext - (unsigned long) &_text;
145 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
146 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
147 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
148 nr_free_pages() << (PAGE_SHIFT-10),
149 max_mapnr << (PAGE_SHIFT-10),
150 codesize >> 10,
151 reservedpages << (PAGE_SHIFT-10),
152 datasize >>10,
153 initsize >> 10);
154 printk("Write protected kernel read-only data: %#lx - %#lx\n",
155 (unsigned long)&_stext,
156 PFN_ALIGN((unsigned long)&_eshared) - 1);
157}
158
159#ifdef CONFIG_DEBUG_PAGEALLOC
160void kernel_map_pages(struct page *page, int numpages, int enable)
161{
162 pgd_t *pgd;
163 pud_t *pud;
164 pmd_t *pmd;
165 pte_t *pte;
166 unsigned long address;
167 int i;
168
169 for (i = 0; i < numpages; i++) {
170 address = page_to_phys(page + i);
171 pgd = pgd_offset_k(address);
172 pud = pud_offset(pgd, address);
173 pmd = pmd_offset(pud, address);
174 pte = pte_offset_kernel(pmd, address);
175 if (!enable) {
176 __ptep_ipte(address, pte);
177 pte_val(*pte) = _PAGE_TYPE_EMPTY;
178 continue;
179 }
180 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
181 /* Flush cpu write queue. */
182 mb();
183 }
184}
185#endif
186
187void free_init_pages(char *what, unsigned long begin, unsigned long end)
188{
189 unsigned long addr = begin;
190
191 if (begin >= end)
192 return;
193 for (; addr < end; addr += PAGE_SIZE) {
194 ClearPageReserved(virt_to_page(addr));
195 init_page_count(virt_to_page(addr));
196 memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
197 PAGE_SIZE);
198 free_page(addr);
199 totalram_pages++;
200 }
201 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
202}
203
204void free_initmem(void)
205{
206 free_init_pages("unused kernel memory",
207 (unsigned long)&__init_begin,
208 (unsigned long)&__init_end);
209}
210
211#ifdef CONFIG_BLK_DEV_INITRD
212void free_initrd_mem(unsigned long start, unsigned long end)
213{
214 free_init_pages("initrd memory", start, end);
215}
216#endif
217
218#ifdef CONFIG_MEMORY_HOTPLUG
219int arch_add_memory(int nid, u64 start, u64 size)
220{
221 struct pglist_data *pgdat;
222 struct zone *zone;
223 int rc;
224
225 pgdat = NODE_DATA(nid);
226 zone = pgdat->node_zones + ZONE_MOVABLE;
227 rc = vmem_add_mapping(start, size);
228 if (rc)
229 return rc;
230 rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
231 if (rc)
232 vmem_remove_mapping(start, size);
233 return rc;
234}
235#endif /* CONFIG_MEMORY_HOTPLUG */
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
43pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
44
45unsigned long empty_zero_page, zero_page_mask;
46EXPORT_SYMBOL(empty_zero_page);
47EXPORT_SYMBOL(zero_page_mask);
48
49static 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 */
79void __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
112void 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
119void __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
139void free_initmem(void)
140{
141 free_initmem_default(POISON_FREE_INITMEM);
142}
143
144#ifdef CONFIG_BLK_DEV_INITRD
145void __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
153int 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
191unsigned 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
201int 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 */