From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-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! --- arch/sparc/mm/init.c | 515 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 515 insertions(+) create mode 100644 arch/sparc/mm/init.c (limited to 'arch/sparc/mm/init.c') diff --git a/arch/sparc/mm/init.c b/arch/sparc/mm/init.c new file mode 100644 index 000000000000..a2dea69b2f07 --- /dev/null +++ b/arch/sparc/mm/init.c @@ -0,0 +1,515 @@ +/* $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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include /* bug in asm-generic/tlb.h: check_pgt_cache */ +#include + +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; + +/* 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; + +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("%d 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; +} + +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); + *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); + *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); + *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. + */ +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); + +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(); + 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 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); + set_bit(PG_highmem, &page->flags); + set_page_count(page, 1); + __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; + + addr = (unsigned long)(&__init_begin); + for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { + struct page *p; + + p = virt_to_page(addr); + + ClearPageReserved(p); + set_page_count(p, 1); + __free_page(p); + totalram_pages++; + num_physpages++; + } + printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__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 freed\n", (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 sparc_flush_page_to_ram(struct page *page) +{ + unsigned long vaddr = (unsigned long)page_address(page); + + if (vaddr) + __flush_page_to_ram(vaddr); +} -- cgit v1.2.3