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 00000000000..fec926021f4
--- /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);
+}