diff options
Diffstat (limited to 'target/linux/ar7-2.6/files/arch/mips/ar7/memory.c')
| -rw-r--r-- | target/linux/ar7-2.6/files/arch/mips/ar7/memory.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/target/linux/ar7-2.6/files/arch/mips/ar7/memory.c b/target/linux/ar7-2.6/files/arch/mips/ar7/memory.c new file mode 100644 index 000000000..ea5b5bee7 --- /dev/null +++ b/target/linux/ar7-2.6/files/arch/mips/ar7/memory.c @@ -0,0 +1,210 @@ +/* + * $Id$ + * + * Copyright (C) 2007 OpenWrt.org + * + * Based on arch/mips/mm/init.c + * Copyright (C) 1994 - 2000 Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com + * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <linux/bootmem.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/pfn.h> +#include <linux/proc_fs.h> +#include <linux/string.h> +#include <linux/swap.h> + +#include <asm/bootinfo.h> +#include <asm/page.h> +#include <asm/sections.h> + +#include <asm/mips-boards/prom.h> + +#warning FIXME: use sdram control regs and/or autodetection +static int __init memsize(void) +{ + char *memsize_str; + unsigned int result; + char cmdline[CL_SIZE], *ptr; + + /* Check the command line first for a memsize directive */ + strcpy(cmdline, arcs_cmdline); + ptr = strstr(cmdline, "memsize="); + if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' ')) + ptr = strstr(ptr, " memsize="); + + if (ptr) { + result = memparse(ptr + 8, &ptr); + } else { + /* otherwise look in the environment */ + memsize_str = prom_getenv("memsize"); + if (!memsize_str) { + prom_printf("memsize not set in boot prom, set to default (8Mb)\n"); + result = 0x00800000; + } else { + result = simple_strtol(memsize_str, NULL, 0); + } + } + + return result; +} + +extern unsigned long __initramfs_start, __initramfs_end; + +#ifdef CONFIG_NEED_MULTIPLE_NODES +static bootmem_data_t node_bootmem_data; +pg_data_t __node_data[1] = { + { + .bdata = &node_bootmem_data + }, +}; +EXPORT_SYMBOL(__node_data); + +unsigned long max_mapnr; +struct page *mem_map; +EXPORT_SYMBOL(max_mapnr); +EXPORT_SYMBOL(mem_map); + +static unsigned long setup_zero_pages(void) +{ + unsigned int order = 3; + unsigned long size; + struct page *page; + + empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!empty_zero_page) + panic("Oh boy, that early out of memory?"); + + page = virt_to_page(empty_zero_page); + split_page(page, order); + while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { + SetPageReserved(page); + page++; + } + + size = PAGE_SIZE << order; + zero_page_mask = (size - 1) & PAGE_MASK; + + return 1UL << order; +} + +extern void pagetable_init(void); + +void __init paging_init(void) +{ + unsigned long zones_size[MAX_NR_ZONES] = { 0, }; + + pagetable_init(); + + zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn; + + free_area_init_node(0, NODE_DATA(0), zones_size, ARCH_PFN_OFFSET, NULL); +} + +static struct kcore_list kcore_mem, kcore_vmalloc; + +void __init mem_init(void) +{ + unsigned long codesize, reservedpages, datasize, initsize; + unsigned long tmp, ram; + unsigned long kernel_start, kernel_end; + + kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text)); + kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end)); + for (tmp = min_low_pfn + 1; tmp < kernel_start; tmp++) { + ClearPageReserved(pfn_to_page(tmp)); + init_page_count(pfn_to_page(tmp)); + free_page((unsigned long)__va(tmp << PAGE_SHIFT)); + } + + totalram_pages += free_all_bootmem(); + totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ + + reservedpages = ram = 0; + for (tmp = min_low_pfn; tmp <= max_low_pfn; tmp++) { + ram++; + if (PageReserved(pfn_to_page(tmp))) + if ((tmp < kernel_start) || (tmp > kernel_end)) + reservedpages++; + } + num_physpages = ram; + + codesize = (unsigned long) &_etext - (unsigned long) &_text; + datasize = (unsigned long) &_edata - (unsigned long) &_etext; + initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; + + kclist_add(&kcore_mem, __va(min_low_pfn), + (max_low_pfn - min_low_pfn) << PAGE_SHIFT); + kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, + VMALLOC_END - VMALLOC_START); + + printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " + "%ldk reserved, %ldk data, %ldk init)\n", + (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), + ram << (PAGE_SHIFT-10), + codesize >> 10, + reservedpages << (PAGE_SHIFT-10), + datasize >> 10, + initsize >> 10); +} +#endif + +void __init prom_meminit(void) +{ +#ifdef CONFIG_NEED_MULTIPLE_NODES + unsigned long kernel_start, kernel_end; + unsigned long pages, free_pages; + unsigned long bootmap_size; +#endif + +#ifdef CONFIG_BLK_DEV_INITRD + initrd_start = (unsigned long)&__initramfs_start; + initrd_end = (unsigned long)&__initramfs_end; +#endif + + pages = memsize() >> PAGE_SHIFT; + add_memory_region(ARCH_PFN_OFFSET << PAGE_SHIFT, pages << + PAGE_SHIFT, BOOT_MEM_RAM); + +#ifdef CONFIG_NEED_MULTIPLE_NODES + kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text)); + kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end)); + min_low_pfn = ARCH_PFN_OFFSET; + max_low_pfn = ARCH_PFN_OFFSET + pages; + max_mapnr = max_low_pfn; + free_pages = pages - (kernel_end - min_low_pfn); + bootmap_size = init_bootmem_node(NODE_DATA(0), kernel_end, + ARCH_PFN_OFFSET, max_low_pfn); + + free_bootmem(PFN_PHYS(kernel_end), free_pages << PAGE_SHIFT); + memory_present(0, min_low_pfn, max_low_pfn); + reserve_bootmem(PFN_PHYS(kernel_end), bootmap_size); + mem_map = NODE_DATA(0)->node_mem_map; +#endif +} + +unsigned long __init prom_free_prom_memory(void) +{ +/* return freed; +*/ + return 0; +} |