| /* |
| * arch/s390/mm/init.c |
| * |
| * S390 version |
| * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| * 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/pfn.h> |
| |
| #include <asm/processor.h> |
| #include <asm/system.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> |
| |
| DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| |
| pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); |
| char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); |
| |
| void diag10(unsigned long addr) |
| { |
| if (addr >= 0x7ff00000) |
| return; |
| asm volatile( |
| #ifdef CONFIG_64BIT |
| " sam31\n" |
| " diag %0,%0,0x10\n" |
| "0: sam64\n" |
| #else |
| " diag %0,%0,0x10\n" |
| "0:\n" |
| #endif |
| EX_TABLE(0b,0b) |
| : : "a" (addr)); |
| } |
| |
| void show_mem(void) |
| { |
| int i, total = 0, reserved = 0; |
| int shared = 0, cached = 0; |
| struct page *page; |
| |
| printk("Mem-info:\n"); |
| show_free_areas(); |
| printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| i = max_mapnr; |
| while (i-- > 0) { |
| page = pfn_to_page(i); |
| total++; |
| if (PageReserved(page)) |
| reserved++; |
| else if (PageSwapCache(page)) |
| cached++; |
| else if (page_count(page)) |
| shared += page_count(page) - 1; |
| } |
| printk("%d pages of RAM\n",total); |
| printk("%d reserved pages\n",reserved); |
| printk("%d pages shared\n",shared); |
| printk("%d pages swap cached\n",cached); |
| } |
| |
| extern unsigned long __initdata zholes_size[]; |
| /* |
| * paging_init() sets up the page tables |
| */ |
| |
| #ifndef CONFIG_64BIT |
| void __init paging_init(void) |
| { |
| pgd_t * pg_dir; |
| pte_t * pg_table; |
| pte_t pte; |
| int i; |
| unsigned long tmp; |
| unsigned long pfn = 0; |
| unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; |
| static const int ssm_mask = 0x04000000L; |
| unsigned long ro_start_pfn, ro_end_pfn; |
| unsigned long zones_size[MAX_NR_ZONES]; |
| |
| ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); |
| ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); |
| |
| memset(zones_size, 0, sizeof(zones_size)); |
| zones_size[ZONE_DMA] = max_low_pfn; |
| free_area_init_node(0, &contig_page_data, zones_size, |
| __pa(PAGE_OFFSET) >> PAGE_SHIFT, |
| zholes_size); |
| |
| /* unmap whole virtual address space */ |
| |
| pg_dir = swapper_pg_dir; |
| |
| for (i = 0; i < PTRS_PER_PGD; i++) |
| pmd_clear((pmd_t *) pg_dir++); |
| |
| /* |
| * map whole physical memory to virtual memory (identity mapping) |
| */ |
| |
| pg_dir = swapper_pg_dir; |
| |
| while (pfn < max_low_pfn) { |
| /* |
| * pg_table is physical at this point |
| */ |
| pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
| |
| pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table); |
| pg_dir++; |
| |
| for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { |
| if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
| pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); |
| else |
| pte = pfn_pte(pfn, PAGE_KERNEL); |
| if (pfn >= max_low_pfn) |
| pte_val(pte) = _PAGE_TYPE_EMPTY; |
| set_pte(pg_table, pte); |
| pfn++; |
| } |
| } |
| |
| S390_lowcore.kernel_asce = pgdir_k; |
| |
| /* enable virtual mapping in kernel mode */ |
| __ctl_load(pgdir_k, 1, 1); |
| __ctl_load(pgdir_k, 7, 7); |
| __ctl_load(pgdir_k, 13, 13); |
| __raw_local_irq_ssm(ssm_mask); |
| |
| local_flush_tlb(); |
| } |
| |
| #else /* CONFIG_64BIT */ |
| |
| void __init paging_init(void) |
| { |
| pgd_t * pg_dir; |
| pmd_t * pm_dir; |
| pte_t * pt_dir; |
| pte_t pte; |
| int i,j,k; |
| unsigned long pfn = 0; |
| unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | |
| _KERN_REGION_TABLE; |
| static const int ssm_mask = 0x04000000L; |
| unsigned long zones_size[MAX_NR_ZONES]; |
| unsigned long dma_pfn, high_pfn; |
| unsigned long ro_start_pfn, ro_end_pfn; |
| |
| memset(zones_size, 0, sizeof(zones_size)); |
| dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; |
| high_pfn = max_low_pfn; |
| ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata); |
| ro_end_pfn = PFN_UP((unsigned long)&__end_rodata); |
| |
| if (dma_pfn > high_pfn) |
| zones_size[ZONE_DMA] = high_pfn; |
| else { |
| zones_size[ZONE_DMA] = dma_pfn; |
| zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; |
| } |
| |
| /* Initialize mem_map[]. */ |
| free_area_init_node(0, &contig_page_data, zones_size, |
| __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); |
| |
| /* |
| * map whole physical memory to virtual memory (identity mapping) |
| */ |
| |
| pg_dir = swapper_pg_dir; |
| |
| for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { |
| |
| if (pfn >= max_low_pfn) { |
| pgd_clear(pg_dir); |
| continue; |
| } |
| |
| pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4); |
| pgd_populate(&init_mm, pg_dir, pm_dir); |
| |
| for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { |
| if (pfn >= max_low_pfn) { |
| pmd_clear(pm_dir); |
| continue; |
| } |
| |
| pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
| pmd_populate_kernel(&init_mm, pm_dir, pt_dir); |
| |
| for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { |
| if (pfn >= ro_start_pfn && pfn < ro_end_pfn) |
| pte = pfn_pte(pfn, __pgprot(_PAGE_RO)); |
| else |
| pte = pfn_pte(pfn, PAGE_KERNEL); |
| if (pfn >= max_low_pfn) |
| pte_val(pte) = _PAGE_TYPE_EMPTY; |
| set_pte(pt_dir, pte); |
| pfn++; |
| } |
| } |
| } |
| |
| S390_lowcore.kernel_asce = pgdir_k; |
| |
| /* enable virtual mapping in kernel mode */ |
| __ctl_load(pgdir_k, 1, 1); |
| __ctl_load(pgdir_k, 7, 7); |
| __ctl_load(pgdir_k, 13, 13); |
| __raw_local_irq_ssm(ssm_mask); |
| |
| local_flush_tlb(); |
| } |
| #endif /* CONFIG_64BIT */ |
| |
| void __init mem_init(void) |
| { |
| unsigned long codesize, reservedpages, datasize, initsize; |
| |
| max_mapnr = num_physpages = max_low_pfn; |
| high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
| |
| /* clear the zero-page */ |
| memset(empty_zero_page, 0, PAGE_SIZE); |
| |
| /* this will put all low memory onto the freelists */ |
| totalram_pages += free_all_bootmem(); |
| |
| reservedpages = 0; |
| |
| codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
| (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| max_mapnr << (PAGE_SHIFT-10), |
| codesize >> 10, |
| reservedpages << (PAGE_SHIFT-10), |
| datasize >>10, |
| initsize >> 10); |
| printk("Write protected kernel read-only data: %#lx - %#lx\n", |
| (unsigned long)&__start_rodata, |
| PFN_ALIGN((unsigned long)&__end_rodata) - 1); |
| } |
| |
| void free_initmem(void) |
| { |
| unsigned long addr; |
| |
| addr = (unsigned long)(&__init_begin); |
| for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(addr)); |
| init_page_count(virt_to_page(addr)); |
| free_page(addr); |
| totalram_pages++; |
| } |
| printk ("Freeing unused kernel memory: %ldk freed\n", |
| ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| if (start < end) |
| printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
| for (; start < end; start += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(start)); |
| init_page_count(virt_to_page(start)); |
| free_page(start); |
| totalram_pages++; |
| } |
| } |
| #endif |
