1 files changed, 524 insertions, 0 deletions

diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
new file mode 100644
index 000000000000..fec926021f49
--- /dev/null
+++ b/arch/sparc/mm/init_32.c
@@ -0,0 +1,524 @@
+/*
+ *  linux/arch/sparc/mm/init.c
+ *
+ *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *  Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
+ *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ *  Copyright (C) 2000 Anton Blanchard (anton@samba.org)
+ */
+
+#include <linux/module.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/initrd.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/pagemap.h>
+#include <linux/poison.h>
+
+#include <asm/sections.h>
+#include <asm/system.h>
+#include <asm/vac-ops.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/vaddrs.h>
+#include <asm/pgalloc.h>        /* bug in asm-generic/tlb.h: check_pgt_cache */
+#include <asm/tlb.h>
+#include <asm/prom.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+unsigned long *sparc_valid_addr_bitmap;
+
+unsigned long phys_base;
+unsigned long pfn_base;
+
+unsigned long page_kernel;
+
+struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
+unsigned long sparc_unmapped_base;
+
+struct pgtable_cache_struct pgt_quicklists;
+
+/* Initial ramdisk setup */
+extern unsigned int sparc_ramdisk_image;
+extern unsigned int sparc_ramdisk_size;
+
+unsigned long highstart_pfn, highend_pfn;
+
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+#define kmap_get_fixmap_pte(vaddr) \
+        pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
+
+void __init kmap_init(void)
+{
+        /* cache the first kmap pte */
+        kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
+        kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
+}
+
+void show_mem(void)
+{
+        printk("Mem-info:\n");
+        show_free_areas();
+        printk("Free swap:       %6ldkB\n",
+               nr_swap_pages << (PAGE_SHIFT-10));
+        printk("%ld pages of RAM\n", totalram_pages);
+        printk("%ld free pages\n", nr_free_pages());
+#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
+        printk("%ld pages in page table cache\n",pgtable_cache_size);
+#ifndef CONFIG_SMP
+        if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
+                printk("%ld entries in page dir cache\n",pgd_cache_size);
+#endif  
+#endif
+}
+
+void __init sparc_context_init(int numctx)
+{
+        int ctx;
+
+        ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
+
+        for(ctx = 0; ctx < numctx; ctx++) {
+                struct ctx_list *clist;
+
+                clist = (ctx_list_pool + ctx);
+                clist->ctx_number = ctx;
+                clist->ctx_mm = NULL;
+        }
+        ctx_free.next = ctx_free.prev = &ctx_free;
+        ctx_used.next = ctx_used.prev = &ctx_used;
+        for(ctx = 0; ctx < numctx; ctx++)
+                add_to_free_ctxlist(ctx_list_pool + ctx);
+}
+
+extern unsigned long cmdline_memory_size;
+unsigned long last_valid_pfn;
+
+unsigned long calc_highpages(void)
+{
+        int i;
+        int nr = 0;
+
+        for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+                unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+                unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+
+                if (end_pfn <= max_low_pfn)
+                        continue;
+
+                if (start_pfn < max_low_pfn)
+                        start_pfn = max_low_pfn;
+
+                nr += end_pfn - start_pfn;
+        }
+
+        return nr;
+}
+
+static unsigned long calc_max_low_pfn(void)
+{
+        int i;
+        unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
+        unsigned long curr_pfn, last_pfn;
+
+        last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
+        for (i = 1; sp_banks[i].num_bytes != 0; i++) {
+                curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+
+                if (curr_pfn >= tmp) {
+                        if (last_pfn < tmp)
+                                tmp = last_pfn;
+                        break;
+                }
+
+                last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+        }
+
+        return tmp;
+}
+
+unsigned long __init bootmem_init(unsigned long *pages_avail)
+{
+        unsigned long bootmap_size, start_pfn;
+        unsigned long end_of_phys_memory = 0UL;
+        unsigned long bootmap_pfn, bytes_avail, size;
+        int i;
+
+        bytes_avail = 0UL;
+        for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+                end_of_phys_memory = sp_banks[i].base_addr +
+                        sp_banks[i].num_bytes;
+                bytes_avail += sp_banks[i].num_bytes;
+                if (cmdline_memory_size) {
+                        if (bytes_avail > cmdline_memory_size) {
+                                unsigned long slack = bytes_avail - cmdline_memory_size;
+
+                                bytes_avail -= slack;
+                                end_of_phys_memory -= slack;
+
+                                sp_banks[i].num_bytes -= slack;
+                                if (sp_banks[i].num_bytes == 0) {
+                                        sp_banks[i].base_addr = 0xdeadbeef;
+                                } else {
+                                        sp_banks[i+1].num_bytes = 0;
+                                        sp_banks[i+1].base_addr = 0xdeadbeef;
+                                }
+                                break;
+                        }
+                }
+        }
+
+        /* Start with page aligned address of last symbol in kernel
+         * image.  
+         */
+        start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
+
+        /* Now shift down to get the real physical page frame number. */
+        start_pfn >>= PAGE_SHIFT;
+
+        bootmap_pfn = start_pfn;
+
+        max_pfn = end_of_phys_memory >> PAGE_SHIFT;
+
+        max_low_pfn = max_pfn;
+        highstart_pfn = highend_pfn = max_pfn;
+
+        if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
+                highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
+                max_low_pfn = calc_max_low_pfn();
+                printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+                    calc_highpages() >> (20 - PAGE_SHIFT));
+        }
+
+#ifdef CONFIG_BLK_DEV_INITRD
+        /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
+        if (sparc_ramdisk_image) {
+                if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
+                        sparc_ramdisk_image -= KERNBASE;
+                initrd_start = sparc_ramdisk_image + phys_base;
+                initrd_end = initrd_start + sparc_ramdisk_size;
+                if (initrd_end > end_of_phys_memory) {
+                        printk(KERN_CRIT "initrd extends beyond end of memory "
+                                         "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
+                               initrd_end, end_of_phys_memory);
+                        initrd_start = 0;
+                }
+                if (initrd_start) {
+                        if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
+                            initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
+                                bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
+                }
+        }
+#endif  
+        /* Initialize the boot-time allocator. */
+        bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
+                                         max_low_pfn);
+
+        /* Now register the available physical memory with the
+         * allocator.
+         */
+        *pages_avail = 0;
+        for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+                unsigned long curr_pfn, last_pfn;
+
+                curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+                if (curr_pfn >= max_low_pfn)
+                        break;
+
+                last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+                if (last_pfn > max_low_pfn)
+                        last_pfn = max_low_pfn;
+
+                /*
+                 * .. finally, did all the rounding and playing
+                 * around just make the area go away?
+                 */
+                if (last_pfn <= curr_pfn)
+                        continue;
+
+                size = (last_pfn - curr_pfn) << PAGE_SHIFT;
+                *pages_avail += last_pfn - curr_pfn;
+
+                free_bootmem(sp_banks[i].base_addr, size);
+        }
+
+#ifdef CONFIG_BLK_DEV_INITRD
+        if (initrd_start) {
+                /* Reserve the initrd image area. */
+                size = initrd_end - initrd_start;
+                reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
+                *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+                initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
+                initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;            
+        }
+#endif
+        /* Reserve the kernel text/data/bss. */
+        size = (start_pfn << PAGE_SHIFT) - phys_base;
+        reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
+        *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+        /* Reserve the bootmem map.   We do not account for it
+         * in pages_avail because we will release that memory
+         * in free_all_bootmem.
+         */
+        size = bootmap_size;
+        reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
+        *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+        return max_pfn;
+}
+
+/*
+ * check_pgt_cache
+ *
+ * This is called at the end of unmapping of VMA (zap_page_range),
+ * to rescan the page cache for architecture specific things,
+ * presumably something like sun4/sun4c PMEGs. Most architectures
+ * define check_pgt_cache empty.
+ *
+ * We simply copy the 2.4 implementation for now.
+ */
+static int pgt_cache_water[2] = { 25, 50 };
+
+void check_pgt_cache(void)
+{
+        do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
+}
+
+/*
+ * paging_init() sets up the page tables: We call the MMU specific
+ * init routine based upon the Sun model type on the Sparc.
+ *
+ */
+extern void sun4c_paging_init(void);
+extern void srmmu_paging_init(void);
+extern void device_scan(void);
+
+pgprot_t PAGE_SHARED __read_mostly;
+EXPORT_SYMBOL(PAGE_SHARED);
+
+void __init paging_init(void)
+{
+        switch(sparc_cpu_model) {
+        case sun4c:
+        case sun4e:
+        case sun4:
+                sun4c_paging_init();
+                sparc_unmapped_base = 0xe0000000;
+                BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
+                break;
+        case sun4m:
+        case sun4d:
+                srmmu_paging_init();
+                sparc_unmapped_base = 0x50000000;
+                BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
+                break;
+        default:
+                prom_printf("paging_init: Cannot init paging on this Sparc\n");
+                prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
+                prom_printf("paging_init: Halting...\n");
+                prom_halt();
+        };
+
+        /* Initialize the protection map with non-constant, MMU dependent values. */
+        protection_map[0] = PAGE_NONE;
+        protection_map[1] = PAGE_READONLY;
+        protection_map[2] = PAGE_COPY;
+        protection_map[3] = PAGE_COPY;
+        protection_map[4] = PAGE_READONLY;
+        protection_map[5] = PAGE_READONLY;
+        protection_map[6] = PAGE_COPY;
+        protection_map[7] = PAGE_COPY;
+        protection_map[8] = PAGE_NONE;
+        protection_map[9] = PAGE_READONLY;
+        protection_map[10] = PAGE_SHARED;
+        protection_map[11] = PAGE_SHARED;
+        protection_map[12] = PAGE_READONLY;
+        protection_map[13] = PAGE_READONLY;
+        protection_map[14] = PAGE_SHARED;
+        protection_map[15] = PAGE_SHARED;
+        btfixup();
+        prom_build_devicetree();
+        device_scan();
+}
+
+static void __init taint_real_pages(void)
+{
+        int i;
+
+        for (i = 0; sp_banks[i].num_bytes; i++) {
+                unsigned long start, end;
+
+                start = sp_banks[i].base_addr;
+                end = start + sp_banks[i].num_bytes;
+
+                while (start < end) {
+                        set_bit(start >> 20, sparc_valid_addr_bitmap);
+                        start += PAGE_SIZE;
+                }
+        }
+}
+
+static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
+{
+        unsigned long tmp;
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+        printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
+#endif
+
+        for (tmp = start_pfn; tmp < end_pfn; tmp++) {
+                struct page *page = pfn_to_page(tmp);
+
+                ClearPageReserved(page);
+                init_page_count(page);
+                __free_page(page);
+                totalhigh_pages++;
+        }
+}
+
+void __init mem_init(void)
+{
+        int codepages = 0;
+        int datapages = 0;
+        int initpages = 0; 
+        int reservedpages = 0;
+        int i;
+
+        if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
+                prom_printf("BUG: fixmap and pkmap areas overlap\n");
+                prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
+                       PKMAP_BASE,
+                       (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
+                       FIXADDR_START);
+                prom_printf("Please mail sparclinux@vger.kernel.org.\n");
+                prom_halt();
+        }
+
+
+        /* Saves us work later. */
+        memset((void *)&empty_zero_page, 0, PAGE_SIZE);
+
+        i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
+        i += 1;
+        sparc_valid_addr_bitmap = (unsigned long *)
+                __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
+
+        if (sparc_valid_addr_bitmap == NULL) {
+                prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
+                prom_halt();
+        }
+        memset(sparc_valid_addr_bitmap, 0, i << 2);
+
+        taint_real_pages();
+
+        max_mapnr = last_valid_pfn - pfn_base;
+        high_memory = __va(max_low_pfn << PAGE_SHIFT);
+
+        totalram_pages = free_all_bootmem();
+
+        for (i = 0; sp_banks[i].num_bytes != 0; i++) {
+                unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
+                unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
+
+                num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
+
+                if (end_pfn <= highstart_pfn)
+                        continue;
+
+                if (start_pfn < highstart_pfn)
+                        start_pfn = highstart_pfn;
+
+                map_high_region(start_pfn, end_pfn);
+        }
+        
+        totalram_pages += totalhigh_pages;
+
+        codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
+        codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
+        datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
+        datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
+        initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
+        initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
+
+        /* Ignore memory holes for the purpose of counting reserved pages */
+        for (i=0; i < max_low_pfn; i++)
+                if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
+                    && PageReserved(pfn_to_page(i)))
+                        reservedpages++;
+
+        printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
+               (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+               num_physpages << (PAGE_SHIFT - 10),
+               codepages << (PAGE_SHIFT-10),
+               reservedpages << (PAGE_SHIFT - 10),
+               datapages << (PAGE_SHIFT-10), 
+               initpages << (PAGE_SHIFT-10),
+               totalhigh_pages << (PAGE_SHIFT-10));
+}
+
+void free_initmem (void)
+{
+        unsigned long addr;
+        unsigned long freed;
+
+        addr = (unsigned long)(&__init_begin);
+        freed = (unsigned long)(&__init_end) - addr;
+        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
+                struct page *p;
+
+                memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
+                p = virt_to_page(addr);
+
+                ClearPageReserved(p);
+                init_page_count(p);
+                __free_page(p);
+                totalram_pages++;
+                num_physpages++;
+        }
+        printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
+                freed >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        if (start < end)
+                printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
+                        (end - start) >> 10);
+        for (; start < end; start += PAGE_SIZE) {
+                struct page *p;
+
+                memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
+                p = virt_to_page(start);
+
+                ClearPageReserved(p);
+                init_page_count(p);
+                __free_page(p);
+                totalram_pages++;
+                num_physpages++;
+        }
+}
+#endif
+
+void sparc_flush_page_to_ram(struct page *page)
+{
+        unsigned long vaddr = (unsigned long)page_address(page);
+
+        if (vaddr)
+                __flush_page_to_ram(vaddr);
+}