![Michael Holzheu](/assets/img/avatar_default.png)
There are several s390 diagnose calls, which must be executed below the 2GB memory boundary. In order to enforce this, those diagnoses must be compiled into the kernel. Currently diag 14 can be called within the vmur kernel module from addresses above 2GB. This leads to specification exceptions. This patch moves diag10, diag14 and diag210 into the new diag.c file. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
201 lines
5.6 KiB
C
201 lines
5.6 KiB
C
/*
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* arch/s390/mm/init.c
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/pfn.h>
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#include <linux/poison.h>
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#include <linux/initrd.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/lowcore.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
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char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
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void show_mem(void)
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{
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int i, total = 0, reserved = 0;
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int shared = 0, cached = 0;
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struct page *page;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages << (PAGE_SHIFT - 10));
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i = max_mapnr;
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while (i-- > 0) {
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if (!pfn_valid(i))
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continue;
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page = pfn_to_page(i);
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (page_count(page))
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shared += page_count(page) - 1;
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}
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printk("%d pages of RAM\n", total);
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printk("%d reserved pages\n", reserved);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
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printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK));
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printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
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printk("%lu pages slab\n",
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global_page_state(NR_SLAB_RECLAIMABLE) +
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global_page_state(NR_SLAB_UNRECLAIMABLE));
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printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
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}
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static void __init setup_ro_region(void)
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{
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pgd_t *pgd;
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pmd_t *pmd;
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pte_t *pte;
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pte_t new_pte;
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unsigned long address, end;
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address = ((unsigned long)&_stext) & PAGE_MASK;
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end = PFN_ALIGN((unsigned long)&_eshared);
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for (; address < end; address += PAGE_SIZE) {
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pgd = pgd_offset_k(address);
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pmd = pmd_offset(pgd, address);
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pte = pte_offset_kernel(pmd, address);
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new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO));
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*pte = new_pte;
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}
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}
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/*
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* paging_init() sets up the page tables
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*/
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void __init paging_init(void)
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{
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pgd_t *pg_dir;
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int i;
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unsigned long pgdir_k;
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static const int ssm_mask = 0x04000000L;
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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pg_dir = swapper_pg_dir;
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#ifdef CONFIG_64BIT
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pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE;
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for (i = 0; i < PTRS_PER_PGD; i++)
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pgd_clear_kernel(pg_dir + i);
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#else
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pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
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for (i = 0; i < PTRS_PER_PGD; i++)
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pmd_clear_kernel((pmd_t *)(pg_dir + i));
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#endif
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vmem_map_init();
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setup_ro_region();
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S390_lowcore.kernel_asce = pgdir_k;
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/* enable virtual mapping in kernel mode */
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__ctl_load(pgdir_k, 1, 1);
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__ctl_load(pgdir_k, 7, 7);
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__ctl_load(pgdir_k, 13, 13);
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__raw_local_irq_ssm(ssm_mask);
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init_nodes(max_zone_pfns);
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}
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void __init mem_init(void)
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{
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unsigned long codesize, reservedpages, datasize, initsize;
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max_mapnr = num_physpages = max_low_pfn;
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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/* this will put all low memory onto the freelists */
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totalram_pages += free_all_bootmem();
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reservedpages = 0;
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codesize = (unsigned long) &_etext - (unsigned long) &_text;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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max_mapnr << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >>10,
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initsize >> 10);
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printk("Write protected kernel read-only data: %#lx - %#lx\n",
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(unsigned long)&_stext,
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PFN_ALIGN((unsigned long)&_eshared) - 1);
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}
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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printk ("Freeing unused kernel memory: %ldk freed\n",
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((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start < end)
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printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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}
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}
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#endif
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