microblaze_v8: memory inicialization, MMU, TLB
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>hifive-unleashed-5.1
Michal Simek
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65bc60930c
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a95d0e1602
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_MMU_H
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#define _ASM_MICROBLAZE_MMU_H
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#ifndef __ASSEMBLY__
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typedef struct {
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struct vm_list_struct *vmlist;
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unsigned long end_brk;
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} mm_context_t;
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_MMU_H */
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_MMU_CONTEXT_H
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#define _ASM_MICROBLAZE_MMU_CONTEXT_H
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# define init_new_context(tsk, mm) ({ 0; })
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# define enter_lazy_tlb(mm, tsk) do {} while (0)
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# define change_mm_context(old, ctx, _pml4) do {} while (0)
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# define destroy_context(mm) do {} while (0)
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# define deactivate_mm(tsk, mm) do {} while (0)
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# define switch_mm(prev, next, tsk) do {} while (0)
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# define activate_mm(prev, next) do {} while (0)
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#endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_TLB_H
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#define _ASM_MICROBLAZE_TLB_H
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#define tlb_flush(tlb) do {} while (0)
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#include <asm-generic/tlb.h>
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#endif /* _ASM_MICROBLAZE_TLB_H */
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_TLBFLUSH_H
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#define _ASM_MICROBLAZE_TLBFLUSH_H
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#define flush_tlb() BUG()
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#define flush_tlb_all() BUG()
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#define flush_tlb_mm(mm) BUG()
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#define flush_tlb_page(vma, addr) BUG()
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#define flush_tlb_range(mm, start, end) BUG()
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#define flush_tlb_pgtables(mm, start, end) BUG()
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#define flush_tlb_kernel_range(start, end) BUG()
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#endif /* _ASM_MICROBLAZE_TLBFLUSH_H */
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/*
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* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/bootmem.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/lmb.h>
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#include <linux/mm.h> /* mem_init */
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#include <linux/initrd.h>
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#include <linux/pagemap.h>
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#include <linux/pfn.h>
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#include <linux/swap.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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unsigned int __page_offset;
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/* EXPORT_SYMBOL(__page_offset); */
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char *klimit = _end;
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/*
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* Initialize the bootmem system and give it all the memory we
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* have available.
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*/
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unsigned int memory_start;
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unsigned int memory_end; /* due to mm/nommu.c */
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unsigned int memory_size;
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/*
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* paging_init() sets up the page tables - in fact we've already done this.
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*/
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static void __init paging_init(void)
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{
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int i;
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unsigned long zones_size[MAX_NR_ZONES];
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/*
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* old: we can DMA to/from any address.put all page into ZONE_DMA
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* We use only ZONE_NORMAL
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*/
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zones_size[ZONE_NORMAL] = max_mapnr;
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/* every other zones are empty */
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for (i = 1; i < MAX_NR_ZONES; i++)
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zones_size[i] = 0;
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free_area_init(zones_size);
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}
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void __init setup_memory(void)
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{
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int i;
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unsigned long map_size;
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u32 kernel_align_start, kernel_align_size;
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/* Find main memory where is the kernel */
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for (i = 0; i < lmb.memory.cnt; i++) {
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memory_start = (u32) lmb.memory.region[i].base;
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memory_end = (u32) lmb.memory.region[i].base
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+ (u32) lmb.memory.region[i].size;
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if ((memory_start <= (u32)_text) &&
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((u32)_text <= memory_end)) {
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memory_size = memory_end - memory_start;
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PAGE_OFFSET = memory_start;
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printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
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"size 0x%08x\n", __func__, memory_start,
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memory_end, memory_size);
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break;
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}
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}
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if (!memory_start || !memory_end) {
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panic("%s: Missing memory setting 0x%08x-0x%08x\n",
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__func__, memory_start, memory_end);
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}
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/* reservation of region where is the kernel */
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kernel_align_start = PAGE_DOWN((u32)_text);
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/* ALIGN can be remove because _end in vmlinux.lds.S is align */
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kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
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lmb_reserve(kernel_align_start, kernel_align_size);
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printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
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__func__, kernel_align_start, kernel_align_start
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+ kernel_align_size, kernel_align_size);
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/*
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* Kernel:
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* start: base phys address of kernel - page align
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* end: base phys address of kernel - page align
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*
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* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
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* max_low_pfn
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* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
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* num_physpages - number of all pages
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*/
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/* memory start is from the kernel end (aligned) to higher addr */
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min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
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/* RAM is assumed contiguous */
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num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
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max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
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printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
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printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
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printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
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/*
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* Find an area to use for the bootmem bitmap.
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* We look for the first area which is at least
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* 128kB in length (128kB is enough for a bitmap
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* for 4GB of memory, using 4kB pages), plus 1 page
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* (in case the address isn't page-aligned).
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*/
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map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
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min_low_pfn, max_low_pfn);
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lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
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/* free bootmem is whole main memory */
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free_bootmem(memory_start, memory_size);
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/* reserve allocate blocks */
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for (i = 0; i < lmb.reserved.cnt; i++) {
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pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
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(u32) lmb.reserved.region[i].base,
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(u32) lmb_size_bytes(&lmb.reserved, i));
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reserve_bootmem(lmb.reserved.region[i].base,
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lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
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}
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paging_init();
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}
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void free_init_pages(char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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for (addr = begin; addr < end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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memset((void *)addr, 0xcc, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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int pages = 0;
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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pages++;
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}
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printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
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}
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#endif
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void free_initmem(void)
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{
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free_init_pages("unused kernel memory",
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(unsigned long)(&__init_begin),
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(unsigned long)(&__init_end));
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}
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/* FIXME from arch/powerpc/mm/mem.c*/
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void show_mem(void)
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{
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printk(KERN_NOTICE "%s\n", __func__);
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}
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void __init mem_init(void)
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{
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high_memory = (void *)__va(memory_end);
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/* this will put all memory onto the freelists */
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totalram_pages += free_all_bootmem();
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printk(KERN_INFO "Memory: %luk/%luk available\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10));
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}
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/* Check against bounds of physical memory */
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int ___range_ok(unsigned long addr, unsigned long size)
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{
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return ((addr < memory_start) ||
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((addr + size) > memory_end));
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}
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