mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-07 04:03:35 +00:00
d882b17251
Put s390's syscall tables into .rodata section and write protect this section to prevent misuse of it. Suggested by Arjan van de Ven <arjan@infradead.org>. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
321 lines
9.3 KiB
C
321 lines
9.3 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 <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 diag10(unsigned long addr)
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{
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if (addr >= 0x7ff00000)
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return;
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#ifdef CONFIG_64BIT
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asm volatile (
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" sam31\n"
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" diag %0,%0,0x10\n"
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"0: sam64\n"
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".section __ex_table,\"a\"\n"
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" .align 8\n"
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" .quad 0b, 0b\n"
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".previous\n"
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: : "a" (addr));
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#else
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asm volatile (
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" diag %0,%0,0x10\n"
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"0:\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 0b, 0b\n"
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".previous\n"
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: : "a" (addr));
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#endif
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}
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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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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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total++;
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if (PageReserved(mem_map+i))
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reserved++;
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else if (PageSwapCache(mem_map+i))
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cached++;
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else if (page_count(mem_map+i))
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shared += page_count(mem_map+i) - 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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}
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extern unsigned long __initdata zholes_size[];
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/*
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* paging_init() sets up the page tables
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*/
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#ifndef CONFIG_64BIT
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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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pte_t * pg_table;
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pte_t pte;
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int i;
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unsigned long tmp;
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unsigned long pfn = 0;
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unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
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static const int ssm_mask = 0x04000000L;
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unsigned long ro_start_pfn, ro_end_pfn;
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ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
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ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
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/* unmap whole virtual address space */
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pg_dir = swapper_pg_dir;
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for (i=0;i<KERNEL_PGD_PTRS;i++)
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pmd_clear((pmd_t*)pg_dir++);
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/*
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* map whole physical memory to virtual memory (identity mapping)
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*/
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pg_dir = swapper_pg_dir;
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while (pfn < max_low_pfn) {
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/*
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* pg_table is physical at this point
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*/
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pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
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pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table));
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pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024));
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pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048));
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pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072));
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pg_dir++;
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for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
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if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
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pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
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else
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pte = pfn_pte(pfn, PAGE_KERNEL);
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if (pfn >= max_low_pfn)
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pte_clear(&init_mm, 0, &pte);
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set_pte(pg_table, pte);
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pfn++;
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}
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}
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S390_lowcore.kernel_asce = pgdir_k;
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/* enable virtual mapping in kernel mode */
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__asm__ __volatile__(" LCTL 1,1,%0\n"
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" LCTL 7,7,%0\n"
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" LCTL 13,13,%0\n"
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" SSM %1"
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: : "m" (pgdir_k), "m" (ssm_mask));
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local_flush_tlb();
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{
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unsigned long zones_size[MAX_NR_ZONES];
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memset(zones_size, 0, sizeof(zones_size));
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zones_size[ZONE_DMA] = max_low_pfn;
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free_area_init_node(0, &contig_page_data, zones_size,
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__pa(PAGE_OFFSET) >> PAGE_SHIFT,
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zholes_size);
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}
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return;
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}
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#else /* CONFIG_64BIT */
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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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pmd_t * pm_dir;
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pte_t * pt_dir;
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pte_t pte;
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int i,j,k;
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unsigned long pfn = 0;
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unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
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_KERN_REGION_TABLE;
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static const int ssm_mask = 0x04000000L;
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unsigned long zones_size[MAX_NR_ZONES];
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unsigned long dma_pfn, high_pfn;
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unsigned long ro_start_pfn, ro_end_pfn;
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memset(zones_size, 0, sizeof(zones_size));
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dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
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high_pfn = max_low_pfn;
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ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
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ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
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if (dma_pfn > high_pfn)
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zones_size[ZONE_DMA] = high_pfn;
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else {
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zones_size[ZONE_DMA] = dma_pfn;
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zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
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}
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/* Initialize mem_map[]. */
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free_area_init_node(0, &contig_page_data, zones_size,
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__pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
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/*
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* map whole physical memory to virtual memory (identity mapping)
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*/
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pg_dir = swapper_pg_dir;
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for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
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if (pfn >= max_low_pfn) {
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pgd_clear(pg_dir);
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continue;
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}
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pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4);
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pgd_populate(&init_mm, pg_dir, pm_dir);
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for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
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if (pfn >= max_low_pfn) {
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pmd_clear(pm_dir);
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continue;
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}
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pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
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pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
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for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
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if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
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pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
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else
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pte = pfn_pte(pfn, PAGE_KERNEL);
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if (pfn >= max_low_pfn) {
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pte_clear(&init_mm, 0, &pte);
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continue;
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}
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set_pte(pt_dir, pte);
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pfn++;
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}
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}
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}
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S390_lowcore.kernel_asce = pgdir_k;
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/* enable virtual mapping in kernel mode */
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__asm__ __volatile__("lctlg 1,1,%0\n\t"
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"lctlg 7,7,%0\n\t"
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"lctlg 13,13,%0\n\t"
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"ssm %1"
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: :"m" (pgdir_k), "m" (ssm_mask));
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local_flush_tlb();
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return;
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}
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#endif /* CONFIG_64BIT */
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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)&__start_rodata,
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PFN_ALIGN((unsigned long)&__end_rodata) - 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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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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