X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fmm%2Finit.c;h=dc675bfcab35faec2b3f9097d80879a030eefe4d;hb=refs%2Fheads%2Fvserver;hp=df953383724d9d0686997e7e931f3c98ad40becb;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index df9533837..dc675bfca 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -9,7 +9,6 @@ * Copyright (C) 1995 Linus Torvalds */ -#include #include #include #include @@ -24,6 +23,8 @@ #include #include #include +#include +#include #include #include @@ -34,6 +35,7 @@ #include #include #include +#include DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); @@ -44,45 +46,40 @@ void diag10(unsigned long addr) { if (addr >= 0x7ff00000) return; + asm volatile( #ifdef CONFIG_64BIT - asm volatile ( - " sam31\n" - " diag %0,%0,0x10\n" - "0: sam64\n" - ".section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 0b, 0b\n" - ".previous\n" - : : "a" (addr)); + " sam31\n" + " diag %0,%0,0x10\n" + "0: sam64\n" #else - asm volatile ( - " diag %0,%0,0x10\n" + " diag %0,%0,0x10\n" "0:\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b, 0b\n" - ".previous\n" - : : "a" (addr)); #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) { + if (!pfn_valid(i)) + continue; + page = pfn_to_page(i); total++; - if (PageReserved(mem_map+i)) + if (PageReserved(page)) reserved++; - else if (PageSwapCache(mem_map+i)) + else if (PageSwapCache(page)) cached++; - else if (page_count(mem_map+i)) - shared += page_count(mem_map+i) - 1; + else if (page_count(page)) + shared += page_count(page) - 1; } printk("%d pages of RAM\n",total); printk("%d reserved pages\n",reserved); @@ -90,173 +87,71 @@ void show_mem(void) printk("%d pages swap cached\n",cached); } -/* References to section boundaries */ - -extern unsigned long _text; -extern unsigned long _etext; -extern unsigned long _edata; -extern unsigned long __bss_start; -extern unsigned long _end; +static void __init setup_ro_region(void) +{ + pgd_t *pgd; + pmd_t *pmd; + pte_t *pte; + pte_t new_pte; + unsigned long address, end; + + address = ((unsigned long)&__start_rodata) & PAGE_MASK; + end = PFN_ALIGN((unsigned long)&__end_rodata); + + for (; address < end; address += PAGE_SIZE) { + pgd = pgd_offset_k(address); + pmd = pmd_offset(pgd, address); + pte = pte_offset_kernel(pmd, address); + new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO)); + set_pte(pte, new_pte); + } +} -extern unsigned long __init_begin; -extern unsigned long __init_end; +extern void vmem_map_init(void); -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; + pgd_t *pg_dir; + int i; + unsigned long pgdir_k; + static const int ssm_mask = 0x04000000L; + unsigned long max_zone_pfns[MAX_NR_ZONES]; - /* unmap whole virtual address space */ + pg_dir = swapper_pg_dir; - pg_dir = swapper_pg_dir; - - for (i=0;ipgd0 = (_PAGE_TABLE | __pa(pg_table)); - pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); - pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); - pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); - pg_dir++; - - for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { - pte = pfn_pte(pfn, PAGE_KERNEL); - if (pfn >= max_low_pfn) - pte_clear(&init_mm, 0, &pte); - set_pte(pg_table, pte); - pfn++; - } - } +#ifdef CONFIG_64BIT + pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; + for (i = 0; i < PTRS_PER_PGD; i++) + pgd_clear(pg_dir + i); +#else + pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; + for (i = 0; i < PTRS_PER_PGD; i++) + pmd_clear((pmd_t *)(pg_dir + i)); +#endif + vmem_map_init(); + setup_ro_region(); S390_lowcore.kernel_asce = pgdir_k; /* enable virtual mapping in kernel mode */ - __asm__ __volatile__(" LCTL 1,1,%0\n" - " LCTL 7,7,%0\n" - " LCTL 13,13,%0\n" - " SSM %1" - : : "m" (pgdir_k), "m" (ssm_mask)); - - local_flush_tlb(); - - { - unsigned long zones_size[MAX_NR_ZONES]; - - 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); - } - return; + __ctl_load(pgdir_k, 1, 1); + __ctl_load(pgdir_k, 7, 7); + __ctl_load(pgdir_k, 13, 13); + __raw_local_irq_ssm(ssm_mask); + + memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); + max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; + free_area_init_nodes(max_zone_pfns); } -#else /* CONFIG_64BIT */ -void __init paging_init(void) +int page_is_ram (unsigned long pagenr) { - 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; - - memset(zones_size, 0, sizeof(zones_size)); - dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; - high_pfn = max_low_pfn; - - 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_low_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_low_pages(PAGE_SIZE); - pmd_populate_kernel(&init_mm, pm_dir, pt_dir); - - for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { - pte = pfn_pte(pfn, PAGE_KERNEL); - if (pfn >= max_low_pfn) { - pte_clear(&init_mm, 0, &pte); - continue; - } - set_pte(pt_dir, pte); - pfn++; - } - } - } - - S390_lowcore.kernel_asce = pgdir_k; - - /* enable virtual mapping in kernel mode */ - __asm__ __volatile__("lctlg 1,1,%0\n\t" - "lctlg 7,7,%0\n\t" - "lctlg 13,13,%0\n\t" - "ssm %1" - : :"m" (pgdir_k), "m" (ssm_mask)); - - local_flush_tlb(); - - return; + return pagenr < max_mapnr; } -#endif /* CONFIG_64BIT */ void __init mem_init(void) { @@ -283,6 +178,11 @@ void __init mem_init(void) 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); + printk("Virtual memmap size: %ldk\n", + (max_pfn * sizeof(struct page)) >> 10); } void free_initmem(void) @@ -292,7 +192,8 @@ void free_initmem(void) addr = (unsigned long)(&__init_begin); for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); - set_page_count(virt_to_page(addr), 1); + init_page_count(virt_to_page(addr)); + memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); free_page(addr); totalram_pages++; } @@ -307,7 +208,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); - set_page_count(virt_to_page(start), 1); + init_page_count(virt_to_page(start)); free_page(start); totalram_pages++; }