Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 000000000000..8e723bc7f795
--- /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