init.c
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上传日期:2013-04-10
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- /* $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
- * 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/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/swapctl.h>
- #ifdef CONFIG_BLK_DEV_INITRD
- #include <linux/blk.h>
- #endif
- #include <linux/init.h>
- #include <linux/highmem.h>
- #include <linux/bootmem.h>
- #include <asm/system.h>
- #include <asm/segment.h>
- #include <asm/vac-ops.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/vaddrs.h>
- #include <asm/tlb.h>
- mmu_gather_t mmu_gathers[NR_CPUS];
- unsigned long *sparc_valid_addr_bitmap;
- unsigned long phys_base;
- unsigned long page_kernel;
- struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
- unsigned long sparc_unmapped_base;
- struct pgtable_cache_struct pgt_quicklists;
- /* References to section boundaries */
- extern char __init_begin, __init_end, _start, _end, etext , edata;
- /* Initial ramdisk setup */
- extern unsigned int sparc_ramdisk_image;
- extern unsigned int sparc_ramdisk_size;
- unsigned long highstart_pfn, highend_pfn;
- unsigned long totalram_pages;
- unsigned long totalhigh_pages;
- pte_t *kmap_pte;
- pgprot_t kmap_prot;
- /* These are set in {srmmu,sun4c}_paging_init() */
- unsigned long fix_kmap_begin;
- unsigned long fix_kmap_end;
- #define kmap_get_fixed_pte(vaddr)
- pte_offset(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
- void __init kmap_init(void)
- {
- /* cache the first kmap pte */
- kmap_pte = kmap_get_fixed_pte(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: %6dkBn",
- nr_swap_pages << (PAGE_SHIFT-10));
- printk("%ld pages of RAMn", totalram_pages);
- printk("%d free pagesn", nr_free_pages());
- printk("%ld pages in page table cachen",pgtable_cache_size);
- #ifndef CONFIG_SMP
- if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
- printk("%ld entries in page dir cachen",pgd_cache_size);
- #endif
- show_buffers();
- }
- extern pgprot_t protection_map[16];
- 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 = 0;
- }
- 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);
- }
- #define DEBUG_BOOTMEM
- 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;
- }
- unsigned long calc_max_low_pfn(void)
- {
- int i;
- unsigned long tmp = (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, max_pfn;
- unsigned long end_of_phys_memory = 0UL;
- unsigned long bootmap_pfn, bytes_avail, size;
- int i;
- #ifdef DEBUG_BOOTMEM
- prom_printf("bootmem_init: Scan sp_banks, ");
- #endif
- 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));
- /* Adjust up to the physical address where the kernel begins. */
- start_pfn += phys_base;
- /* 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 > (SRMMU_MAXMEM >> PAGE_SHIFT)) {
- highstart_pfn = (SRMMU_MAXMEM >> PAGE_SHIFT);
- max_low_pfn = calc_max_low_pfn();
- printk(KERN_NOTICE "%ldMB HIGHMEM available.n", calc_highpages());
- }
- #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 initrdn",
- 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. */
- #ifdef DEBUG_BOOTMEM
- prom_printf("init_bootmem(spfn[%lx],bpfn[%lx],mlpfn[%lx])n",
- start_pfn, bootmap_pfn, max_low_pfn);
- #endif
- bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, phys_base>>PAGE_SHIFT, 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;
- #ifdef DEBUG_BOOTMEM
- prom_printf("free_bootmem: base[%lx] size[%lx]n",
- sp_banks[i].base_addr,
- size);
- #endif
- free_bootmem(sp_banks[i].base_addr,
- size);
- }
- #ifdef CONFIG_BLK_DEV_INITRD
- if (initrd_start) {
- size = initrd_end - initrd_start;
- #ifdef DEBUG_BOOTMEM
- prom_printf("reserve_bootmem: base[%lx] size[%lx]n",
- initrd_start, size);
- #endif
- /* Reserve the initrd image area. */
- reserve_bootmem(initrd_start, size);
- *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
- initrd_start += PAGE_OFFSET;
- initrd_end += PAGE_OFFSET;
- }
- #endif
- /* Reserve the kernel text/data/bss. */
- size = (start_pfn << PAGE_SHIFT) - phys_base;
- #ifdef DEBUG_BOOTMEM
- prom_printf("reserve_bootmem: base[%lx] size[%lx]n", phys_base, size);
- #endif
- reserve_bootmem(phys_base, size);
- *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;
- #ifdef DEBUG_BOOTMEM
- prom_printf("reserve_bootmem: base[%lx] size[%lx]n",
- (bootmap_pfn << PAGE_SHIFT), size);
- #endif
- reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
- *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
- return max_pfn;
- }
- /*
- * 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);
- 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 Sparcn");
- prom_printf("paging_init: sparc_cpu_model = %dn", 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();
- device_scan();
- }
- struct cache_palias *sparc_aliases;
- 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;
- }
- }
- }
- void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
- {
- unsigned long tmp;
- #ifdef DEBUG_HIGHMEM
- printk("mapping high region %08lx - %08lxn", start_pfn, end_pfn);
- #endif
- for (tmp = start_pfn; tmp < end_pfn; tmp++) {
- struct page *page = mem_map + tmp;
- ClearPageReserved(page);
- set_bit(PG_highmem, &page->flags);
- atomic_set(&page->count, 1);
- __free_page(page);
- totalhigh_pages++;
- }
- }
- void __init mem_init(void)
- {
- int codepages = 0;
- int datapages = 0;
- int initpages = 0;
- int i;
- highmem_start_page = mem_map + highstart_pfn;
- /* 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 - (phys_base >> PAGE_SHIFT);
- high_memory = __va(max_low_pfn << PAGE_SHIFT);
- #ifdef DEBUG_BOOTMEM
- prom_printf("mem_init: Calling free_all_bootmem().n");
- #endif
- num_physpages = 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;
- 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;
- printk(KERN_INFO "Memory: %dk available (%dk kernel code, %dk data, %dk init, %ldk highmem) [%08lx,%08lx]n",
- nr_free_pages() << (PAGE_SHIFT-10),
- codepages << (PAGE_SHIFT-10),
- datapages << (PAGE_SHIFT-10),
- initpages << (PAGE_SHIFT-10),
- totalhigh_pages << (PAGE_SHIFT-10),
- (unsigned long)PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));
- }
- void free_initmem (void)
- {
- unsigned long addr;
- addr = (unsigned long)(&__init_begin);
- for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
- unsigned long page;
- struct page *p;
- page = addr + phys_base;
- p = virt_to_page(page);
- ClearPageReserved(p);
- set_page_count(p, 1);
- __free_page(p);
- totalram_pages++;
- num_physpages++;
- }
- printk (KERN_INFO "Freeing unused kernel memory: %dk freedn", (&__init_end - &__init_begin) >> 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 freedn", (end - start) >> 10);
- for (; start < end; start += PAGE_SIZE) {
- struct page *p = virt_to_page(start);
- ClearPageReserved(p);
- set_page_count(p, 1);
- __free_page(p);
- num_physpages++;
- }
- }
- #endif
- void si_meminfo(struct sysinfo *val)
- {
- val->totalram = totalram_pages;
- val->sharedram = 0;
- val->freeram = nr_free_pages();
- val->bufferram = atomic_read(&buffermem_pages);
- val->totalhigh = totalhigh_pages;
- val->freehigh = nr_free_highpages();
- val->mem_unit = PAGE_SIZE;
- }
- void flush_page_to_ram(struct page *page)
- {
- unsigned long vaddr = (unsigned long)page_address(page);
- if (vaddr)
- __flush_page_to_ram(vaddr);
- }