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-rw-r--r--arch/s390/mm/init.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
new file mode 100644
index 00000000000..8e723bc7f79
--- /dev/null
+++ b/arch/s390/mm/init.c
@@ -0,0 +1,310 @@
+/*
+ * 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/config.h>
+#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 <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>
+
+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;
+#ifdef __s390x__
+ 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));
+#else
+ asm volatile (
+ " diag %0,%0,0x10\n"
+ "0:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b, 0b\n"
+ ".previous\n"
+ : : "a" (addr));
+#endif
+}
+
+void show_mem(void)
+{
+ int i, total = 0, reserved = 0;
+ int shared = 0, cached = 0;
+
+ printk("Mem-info:\n");
+ show_free_areas();
+ printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (page_count(mem_map+i))
+ shared += page_count(mem_map+i) - 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);
+}
+
+/* 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;
+
+extern unsigned long __init_begin;
+extern unsigned long __init_end;
+
+/*
+ * paging_init() sets up the page tables
+ */
+
+#ifndef CONFIG_ARCH_S390X
+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;
+
+ /* unmap whole virtual address space */
+
+ pg_dir = swapper_pg_dir;
+
+ for (i=0;i<KERNEL_PGD_PTRS;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_low_pages(PAGE_SIZE);
+
+ pg_dir->pgd0 = (_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++;
+ }
+ }
+
+ 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] = { 0, 0, 0};
+
+ zones_size[ZONE_DMA] = max_low_pfn;
+ free_area_init(zones_size);
+ }
+ return;
+}
+
+#else /* CONFIG_ARCH_S390X */
+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] = {0, 0, 0};
+ unsigned long dma_pfn, high_pfn;
+
+ 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(zones_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;
+}
+#endif /* CONFIG_ARCH_S390X */
+
+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);
+}
+
+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));
+ set_page_count(virt_to_page(addr), 1);
+ 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));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ }
+}
+#endif
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