diff options
Diffstat (limited to 'kernel/arch/sparc/mm/init_32.c')
| -rw-r--r-- | kernel/arch/sparc/mm/init_32.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/kernel/arch/sparc/mm/init_32.c b/kernel/arch/sparc/mm/init_32.c new file mode 100644 index 000000000..eb8287155 --- /dev/null +++ b/kernel/arch/sparc/mm/init_32.c @@ -0,0 +1,359 @@ +/* + * 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 <linux/gfp.h> + +#include <asm/sections.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/setup.h> +#include <asm/tlb.h> +#include <asm/prom.h> +#include <asm/leon.h> + +#include "mm_32.h" + +unsigned long *sparc_valid_addr_bitmap; +EXPORT_SYMBOL(sparc_valid_addr_bitmap); + +unsigned long phys_base; +EXPORT_SYMBOL(phys_base); + +unsigned long pfn_base; +EXPORT_SYMBOL(pfn_base); + +struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; + +/* Initial ramdisk setup */ +extern unsigned int sparc_ramdisk_image; +extern unsigned int sparc_ramdisk_size; + +unsigned long highstart_pfn, highend_pfn; + +void show_mem(unsigned int filter) +{ + printk("Mem-info:\n"); + show_free_areas(filter); + printk("Free swap: %6ldkB\n", + get_nr_swap_pages() << (PAGE_SHIFT-10)); + printk("%ld pages of RAM\n", totalram_pages); + printk("%ld free pages\n", nr_free_pages()); +} + + +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; +} + +/* + * paging_init() sets up the page tables: We call the MMU specific + * init routine based upon the Sun model type on the Sparc. + * + */ +void __init paging_init(void) +{ + srmmu_paging_init(); + prom_build_devicetree(); + of_fill_in_cpu_data(); + 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++) + free_highmem_page(pfn_to_page(tmp)); +} + +void __init mem_init(void) +{ + 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); + 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); + } + + mem_init_print_info(NULL); +} + +void free_initmem (void) +{ + free_initmem_default(POISON_FREE_INITMEM); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, + "initrd"); +} +#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); +} +EXPORT_SYMBOL(sparc_flush_page_to_ram); |