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874 lines
22 KiB
874 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/parisc/mm/init.c |
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* |
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* Copyright (C) 1995 Linus Torvalds |
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* Copyright 1999 SuSE GmbH |
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* changed by Philipp Rumpf |
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* Copyright 1999 Philipp Rumpf ([email protected]) |
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* Copyright 2004 Randolph Chung ([email protected]) |
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* Copyright 2006-2007 Helge Deller ([email protected]) |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <linux/memblock.h> |
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#include <linux/gfp.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/initrd.h> |
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#include <linux/swap.h> |
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#include <linux/unistd.h> |
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#include <linux/nodemask.h> /* for node_online_map */ |
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#include <linux/pagemap.h> /* for release_pages */ |
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#include <linux/compat.h> |
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#include <asm/pgalloc.h> |
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#include <asm/tlb.h> |
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#include <asm/pdc_chassis.h> |
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#include <asm/mmzone.h> |
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#include <asm/sections.h> |
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#include <asm/msgbuf.h> |
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#include <asm/sparsemem.h> |
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extern int data_start; |
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extern void parisc_kernel_start(void); /* Kernel entry point in head.S */ |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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pmd_t pmd0[PTRS_PER_PMD] __section(".data..vm0.pmd") __attribute__ ((aligned(PAGE_SIZE))); |
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#endif |
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".data..vm0.pgd") __attribute__ ((aligned(PAGE_SIZE))); |
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pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __section(".data..vm0.pte") __attribute__ ((aligned(PAGE_SIZE))); |
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static struct resource data_resource = { |
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.name = "Kernel data", |
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
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}; |
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static struct resource code_resource = { |
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.name = "Kernel code", |
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
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}; |
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static struct resource pdcdata_resource = { |
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.name = "PDC data (Page Zero)", |
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.start = 0, |
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.end = 0x9ff, |
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM, |
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}; |
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static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init; |
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/* The following array is initialized from the firmware specific |
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* information retrieved in kernel/inventory.c. |
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*/ |
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physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata; |
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int npmem_ranges __initdata; |
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#ifdef CONFIG_64BIT |
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#define MAX_MEM (1UL << MAX_PHYSMEM_BITS) |
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#else /* !CONFIG_64BIT */ |
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#define MAX_MEM (3584U*1024U*1024U) |
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#endif /* !CONFIG_64BIT */ |
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static unsigned long mem_limit __read_mostly = MAX_MEM; |
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static void __init mem_limit_func(void) |
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{ |
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char *cp, *end; |
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unsigned long limit; |
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/* We need this before __setup() functions are called */ |
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limit = MAX_MEM; |
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for (cp = boot_command_line; *cp; ) { |
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if (memcmp(cp, "mem=", 4) == 0) { |
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cp += 4; |
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limit = memparse(cp, &end); |
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if (end != cp) |
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break; |
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cp = end; |
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} else { |
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while (*cp != ' ' && *cp) |
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++cp; |
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while (*cp == ' ') |
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++cp; |
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} |
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} |
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if (limit < mem_limit) |
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mem_limit = limit; |
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} |
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#define MAX_GAP (0x40000000UL >> PAGE_SHIFT) |
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static void __init setup_bootmem(void) |
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{ |
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unsigned long mem_max; |
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#ifndef CONFIG_SPARSEMEM |
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physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; |
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int npmem_holes; |
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#endif |
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int i, sysram_resource_count; |
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disable_sr_hashing(); /* Turn off space register hashing */ |
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/* |
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* Sort the ranges. Since the number of ranges is typically |
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* small, and performance is not an issue here, just do |
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* a simple insertion sort. |
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*/ |
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for (i = 1; i < npmem_ranges; i++) { |
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int j; |
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for (j = i; j > 0; j--) { |
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physmem_range_t tmp; |
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if (pmem_ranges[j-1].start_pfn < |
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pmem_ranges[j].start_pfn) { |
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break; |
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} |
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tmp = pmem_ranges[j-1]; |
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pmem_ranges[j-1] = pmem_ranges[j]; |
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pmem_ranges[j] = tmp; |
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} |
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} |
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#ifndef CONFIG_SPARSEMEM |
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/* |
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* Throw out ranges that are too far apart (controlled by |
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* MAX_GAP). |
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*/ |
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for (i = 1; i < npmem_ranges; i++) { |
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if (pmem_ranges[i].start_pfn - |
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(pmem_ranges[i-1].start_pfn + |
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pmem_ranges[i-1].pages) > MAX_GAP) { |
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npmem_ranges = i; |
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printk("Large gap in memory detected (%ld pages). " |
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"Consider turning on CONFIG_SPARSEMEM\n", |
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pmem_ranges[i].start_pfn - |
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(pmem_ranges[i-1].start_pfn + |
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pmem_ranges[i-1].pages)); |
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break; |
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} |
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} |
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#endif |
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/* Print the memory ranges */ |
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pr_info("Memory Ranges:\n"); |
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for (i = 0; i < npmem_ranges; i++) { |
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struct resource *res = &sysram_resources[i]; |
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unsigned long start; |
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unsigned long size; |
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size = (pmem_ranges[i].pages << PAGE_SHIFT); |
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start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); |
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pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", |
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i, start, start + (size - 1), size >> 20); |
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/* request memory resource */ |
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res->name = "System RAM"; |
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res->start = start; |
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res->end = start + size - 1; |
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res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
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request_resource(&iomem_resource, res); |
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} |
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sysram_resource_count = npmem_ranges; |
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/* |
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* For 32 bit kernels we limit the amount of memory we can |
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* support, in order to preserve enough kernel address space |
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* for other purposes. For 64 bit kernels we don't normally |
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* limit the memory, but this mechanism can be used to |
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* artificially limit the amount of memory (and it is written |
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* to work with multiple memory ranges). |
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*/ |
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mem_limit_func(); /* check for "mem=" argument */ |
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mem_max = 0; |
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for (i = 0; i < npmem_ranges; i++) { |
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unsigned long rsize; |
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rsize = pmem_ranges[i].pages << PAGE_SHIFT; |
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if ((mem_max + rsize) > mem_limit) { |
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printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); |
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if (mem_max == mem_limit) |
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npmem_ranges = i; |
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else { |
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pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) |
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- (mem_max >> PAGE_SHIFT); |
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npmem_ranges = i + 1; |
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mem_max = mem_limit; |
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} |
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break; |
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} |
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mem_max += rsize; |
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} |
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printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); |
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#ifndef CONFIG_SPARSEMEM |
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/* Merge the ranges, keeping track of the holes */ |
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{ |
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unsigned long end_pfn; |
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unsigned long hole_pages; |
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npmem_holes = 0; |
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end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; |
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for (i = 1; i < npmem_ranges; i++) { |
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hole_pages = pmem_ranges[i].start_pfn - end_pfn; |
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if (hole_pages) { |
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pmem_holes[npmem_holes].start_pfn = end_pfn; |
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pmem_holes[npmem_holes++].pages = hole_pages; |
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end_pfn += hole_pages; |
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} |
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end_pfn += pmem_ranges[i].pages; |
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} |
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pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; |
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npmem_ranges = 1; |
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} |
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#endif |
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/* |
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* Initialize and free the full range of memory in each range. |
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*/ |
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max_pfn = 0; |
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for (i = 0; i < npmem_ranges; i++) { |
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unsigned long start_pfn; |
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unsigned long npages; |
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unsigned long start; |
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unsigned long size; |
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start_pfn = pmem_ranges[i].start_pfn; |
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npages = pmem_ranges[i].pages; |
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start = start_pfn << PAGE_SHIFT; |
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size = npages << PAGE_SHIFT; |
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/* add system RAM memblock */ |
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memblock_add(start, size); |
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if ((start_pfn + npages) > max_pfn) |
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max_pfn = start_pfn + npages; |
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} |
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/* |
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* We can't use memblock top-down allocations because we only |
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* created the initial mapping up to KERNEL_INITIAL_SIZE in |
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* the assembly bootup code. |
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*/ |
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memblock_set_bottom_up(true); |
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/* IOMMU is always used to access "high mem" on those boxes |
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* that can support enough mem that a PCI device couldn't |
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* directly DMA to any physical addresses. |
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* ISA DMA support will need to revisit this. |
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*/ |
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max_low_pfn = max_pfn; |
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/* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ |
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#define PDC_CONSOLE_IO_IODC_SIZE 32768 |
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memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free + |
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PDC_CONSOLE_IO_IODC_SIZE)); |
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memblock_reserve(__pa(KERNEL_BINARY_TEXT_START), |
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(unsigned long)(_end - KERNEL_BINARY_TEXT_START)); |
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#ifndef CONFIG_SPARSEMEM |
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/* reserve the holes */ |
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for (i = 0; i < npmem_holes; i++) { |
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memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT), |
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(pmem_holes[i].pages << PAGE_SHIFT)); |
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} |
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#endif |
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#ifdef CONFIG_BLK_DEV_INITRD |
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if (initrd_start) { |
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printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); |
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if (__pa(initrd_start) < mem_max) { |
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unsigned long initrd_reserve; |
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if (__pa(initrd_end) > mem_max) { |
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initrd_reserve = mem_max - __pa(initrd_start); |
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} else { |
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initrd_reserve = initrd_end - initrd_start; |
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} |
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initrd_below_start_ok = 1; |
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printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); |
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memblock_reserve(__pa(initrd_start), initrd_reserve); |
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} |
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} |
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#endif |
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data_resource.start = virt_to_phys(&data_start); |
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data_resource.end = virt_to_phys(_end) - 1; |
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code_resource.start = virt_to_phys(_text); |
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code_resource.end = virt_to_phys(&data_start)-1; |
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/* We don't know which region the kernel will be in, so try |
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* all of them. |
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*/ |
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for (i = 0; i < sysram_resource_count; i++) { |
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struct resource *res = &sysram_resources[i]; |
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request_resource(res, &code_resource); |
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request_resource(res, &data_resource); |
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} |
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request_resource(&sysram_resources[0], &pdcdata_resource); |
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/* Initialize Page Deallocation Table (PDT) and check for bad memory. */ |
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pdc_pdt_init(); |
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memblock_allow_resize(); |
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memblock_dump_all(); |
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} |
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static bool kernel_set_to_readonly; |
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static void __init map_pages(unsigned long start_vaddr, |
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unsigned long start_paddr, unsigned long size, |
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pgprot_t pgprot, int force) |
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{ |
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pmd_t *pmd; |
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pte_t *pg_table; |
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unsigned long end_paddr; |
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unsigned long start_pmd; |
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unsigned long start_pte; |
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unsigned long tmp1; |
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unsigned long tmp2; |
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unsigned long address; |
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unsigned long vaddr; |
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unsigned long ro_start; |
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unsigned long ro_end; |
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unsigned long kernel_start, kernel_end; |
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ro_start = __pa((unsigned long)_text); |
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ro_end = __pa((unsigned long)&data_start); |
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kernel_start = __pa((unsigned long)&__init_begin); |
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kernel_end = __pa((unsigned long)&_end); |
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end_paddr = start_paddr + size; |
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/* for 2-level configuration PTRS_PER_PMD is 0 so start_pmd will be 0 */ |
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start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); |
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start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); |
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address = start_paddr; |
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vaddr = start_vaddr; |
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while (address < end_paddr) { |
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pgd_t *pgd = pgd_offset_k(vaddr); |
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p4d_t *p4d = p4d_offset(pgd, vaddr); |
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pud_t *pud = pud_offset(p4d, vaddr); |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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if (pud_none(*pud)) { |
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pmd = memblock_alloc(PAGE_SIZE << PMD_ORDER, |
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PAGE_SIZE << PMD_ORDER); |
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if (!pmd) |
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panic("pmd allocation failed.\n"); |
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pud_populate(NULL, pud, pmd); |
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} |
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#endif |
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pmd = pmd_offset(pud, vaddr); |
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for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { |
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if (pmd_none(*pmd)) { |
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pg_table = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
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if (!pg_table) |
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panic("page table allocation failed\n"); |
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pmd_populate_kernel(NULL, pmd, pg_table); |
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} |
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pg_table = pte_offset_kernel(pmd, vaddr); |
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for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { |
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pte_t pte; |
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pgprot_t prot; |
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bool huge = false; |
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if (force) { |
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prot = pgprot; |
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} else if (address < kernel_start || address >= kernel_end) { |
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/* outside kernel memory */ |
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prot = PAGE_KERNEL; |
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} else if (!kernel_set_to_readonly) { |
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/* still initializing, allow writing to RO memory */ |
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prot = PAGE_KERNEL_RWX; |
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huge = true; |
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} else if (address >= ro_start) { |
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/* Code (ro) and Data areas */ |
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prot = (address < ro_end) ? |
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PAGE_KERNEL_EXEC : PAGE_KERNEL; |
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huge = true; |
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} else { |
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prot = PAGE_KERNEL; |
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} |
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pte = __mk_pte(address, prot); |
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if (huge) |
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pte = pte_mkhuge(pte); |
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if (address >= end_paddr) |
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break; |
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set_pte(pg_table, pte); |
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address += PAGE_SIZE; |
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vaddr += PAGE_SIZE; |
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} |
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start_pte = 0; |
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if (address >= end_paddr) |
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break; |
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} |
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start_pmd = 0; |
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} |
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} |
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void __init set_kernel_text_rw(int enable_read_write) |
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{ |
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unsigned long start = (unsigned long) __init_begin; |
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unsigned long end = (unsigned long) &data_start; |
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map_pages(start, __pa(start), end-start, |
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PAGE_KERNEL_RWX, enable_read_write ? 1:0); |
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/* force the kernel to see the new page table entries */ |
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flush_cache_all(); |
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flush_tlb_all(); |
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} |
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void __ref free_initmem(void) |
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{ |
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unsigned long init_begin = (unsigned long)__init_begin; |
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unsigned long init_end = (unsigned long)__init_end; |
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unsigned long kernel_end = (unsigned long)&_end; |
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/* Remap kernel text and data, but do not touch init section yet. */ |
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kernel_set_to_readonly = true; |
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map_pages(init_end, __pa(init_end), kernel_end - init_end, |
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PAGE_KERNEL, 0); |
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/* The init text pages are marked R-X. We have to |
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* flush the icache and mark them RW- |
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* |
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* This is tricky, because map_pages is in the init section. |
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* Do a dummy remap of the data section first (the data |
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* section is already PAGE_KERNEL) to pull in the TLB entries |
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* for map_kernel */ |
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map_pages(init_begin, __pa(init_begin), init_end - init_begin, |
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PAGE_KERNEL_RWX, 1); |
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/* now remap at PAGE_KERNEL since the TLB is pre-primed to execute |
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* map_pages */ |
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map_pages(init_begin, __pa(init_begin), init_end - init_begin, |
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PAGE_KERNEL, 1); |
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/* force the kernel to see the new TLB entries */ |
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__flush_tlb_range(0, init_begin, kernel_end); |
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|
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/* finally dump all the instructions which were cached, since the |
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* pages are no-longer executable */ |
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flush_icache_range(init_begin, init_end); |
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free_initmem_default(POISON_FREE_INITMEM); |
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/* set up a new led state on systems shipped LED State panel */ |
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); |
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} |
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#ifdef CONFIG_STRICT_KERNEL_RWX |
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void mark_rodata_ro(void) |
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{ |
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/* rodata memory was already mapped with KERNEL_RO access rights by |
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pagetable_init() and map_pages(). No need to do additional stuff here */ |
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unsigned long roai_size = __end_ro_after_init - __start_ro_after_init; |
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pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10); |
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} |
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#endif |
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/* |
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* Just an arbitrary offset to serve as a "hole" between mapping areas |
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* (between top of physical memory and a potential pcxl dma mapping |
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* area, and below the vmalloc mapping area). |
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* |
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* The current 32K value just means that there will be a 32K "hole" |
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* between mapping areas. That means that any out-of-bounds memory |
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* accesses will hopefully be caught. The vmalloc() routines leaves |
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* a hole of 4kB between each vmalloced area for the same reason. |
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*/ |
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|
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/* Leave room for gateway page expansion */ |
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#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE |
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#error KERNEL_MAP_START is in gateway reserved region |
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#endif |
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#define MAP_START (KERNEL_MAP_START) |
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#define VM_MAP_OFFSET (32*1024) |
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#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ |
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& ~(VM_MAP_OFFSET-1))) |
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void *parisc_vmalloc_start __ro_after_init; |
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EXPORT_SYMBOL(parisc_vmalloc_start); |
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#ifdef CONFIG_PA11 |
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unsigned long pcxl_dma_start __ro_after_init; |
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#endif |
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void __init mem_init(void) |
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{ |
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/* Do sanity checks on IPC (compat) structures */ |
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BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48); |
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#ifndef CONFIG_64BIT |
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BUILD_BUG_ON(sizeof(struct semid64_ds) != 80); |
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BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104); |
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BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104); |
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#endif |
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#ifdef CONFIG_COMPAT |
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BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm)); |
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BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80); |
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BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104); |
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BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104); |
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#endif |
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|
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/* Do sanity checks on page table constants */ |
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BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); |
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BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); |
|
BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); |
|
BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD |
|
> BITS_PER_LONG); |
|
#if CONFIG_PGTABLE_LEVELS == 3 |
|
BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PMD); |
|
#else |
|
BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD); |
|
#endif |
|
|
|
high_memory = __va((max_pfn << PAGE_SHIFT)); |
|
set_max_mapnr(max_low_pfn); |
|
memblock_free_all(); |
|
|
|
#ifdef CONFIG_PA11 |
|
if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) { |
|
pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); |
|
parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start |
|
+ PCXL_DMA_MAP_SIZE); |
|
} else |
|
#endif |
|
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
|
|
|
mem_init_print_info(NULL); |
|
|
|
#if 0 |
|
/* |
|
* Do not expose the virtual kernel memory layout to userspace. |
|
* But keep code for debugging purposes. |
|
*/ |
|
printk("virtual kernel memory layout:\n" |
|
" vmalloc : 0x%px - 0x%px (%4ld MB)\n" |
|
" fixmap : 0x%px - 0x%px (%4ld kB)\n" |
|
" memory : 0x%px - 0x%px (%4ld MB)\n" |
|
" .init : 0x%px - 0x%px (%4ld kB)\n" |
|
" .data : 0x%px - 0x%px (%4ld kB)\n" |
|
" .text : 0x%px - 0x%px (%4ld kB)\n", |
|
|
|
(void*)VMALLOC_START, (void*)VMALLOC_END, |
|
(VMALLOC_END - VMALLOC_START) >> 20, |
|
|
|
(void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE), |
|
(unsigned long)(FIXMAP_SIZE / 1024), |
|
|
|
__va(0), high_memory, |
|
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, |
|
|
|
__init_begin, __init_end, |
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, |
|
|
|
_etext, _edata, |
|
((unsigned long)_edata - (unsigned long)_etext) >> 10, |
|
|
|
_text, _etext, |
|
((unsigned long)_etext - (unsigned long)_text) >> 10); |
|
#endif |
|
} |
|
|
|
unsigned long *empty_zero_page __ro_after_init; |
|
EXPORT_SYMBOL(empty_zero_page); |
|
|
|
/* |
|
* pagetable_init() sets up the page tables |
|
* |
|
* Note that gateway_init() places the Linux gateway page at page 0. |
|
* Since gateway pages cannot be dereferenced this has the desirable |
|
* side effect of trapping those pesky NULL-reference errors in the |
|
* kernel. |
|
*/ |
|
static void __init pagetable_init(void) |
|
{ |
|
int range; |
|
|
|
/* Map each physical memory range to its kernel vaddr */ |
|
|
|
for (range = 0; range < npmem_ranges; range++) { |
|
unsigned long start_paddr; |
|
unsigned long end_paddr; |
|
unsigned long size; |
|
|
|
start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; |
|
size = pmem_ranges[range].pages << PAGE_SHIFT; |
|
end_paddr = start_paddr + size; |
|
|
|
map_pages((unsigned long)__va(start_paddr), start_paddr, |
|
size, PAGE_KERNEL, 0); |
|
} |
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD |
|
if (initrd_end && initrd_end > mem_limit) { |
|
printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
|
map_pages(initrd_start, __pa(initrd_start), |
|
initrd_end - initrd_start, PAGE_KERNEL, 0); |
|
} |
|
#endif |
|
|
|
empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
|
if (!empty_zero_page) |
|
panic("zero page allocation failed.\n"); |
|
|
|
} |
|
|
|
static void __init gateway_init(void) |
|
{ |
|
unsigned long linux_gateway_page_addr; |
|
/* FIXME: This is 'const' in order to trick the compiler |
|
into not treating it as DP-relative data. */ |
|
extern void * const linux_gateway_page; |
|
|
|
linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; |
|
|
|
/* |
|
* Setup Linux Gateway page. |
|
* |
|
* The Linux gateway page will reside in kernel space (on virtual |
|
* page 0), so it doesn't need to be aliased into user space. |
|
*/ |
|
|
|
map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), |
|
PAGE_SIZE, PAGE_GATEWAY, 1); |
|
} |
|
|
|
static void __init parisc_bootmem_free(void) |
|
{ |
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, }; |
|
|
|
max_zone_pfn[0] = memblock_end_of_DRAM(); |
|
|
|
free_area_init(max_zone_pfn); |
|
} |
|
|
|
void __init paging_init(void) |
|
{ |
|
setup_bootmem(); |
|
pagetable_init(); |
|
gateway_init(); |
|
flush_cache_all_local(); /* start with known state */ |
|
flush_tlb_all_local(NULL); |
|
|
|
sparse_init(); |
|
parisc_bootmem_free(); |
|
} |
|
|
|
#ifdef CONFIG_PA20 |
|
|
|
/* |
|
* Currently, all PA20 chips have 18 bit protection IDs, which is the |
|
* limiting factor (space ids are 32 bits). |
|
*/ |
|
|
|
#define NR_SPACE_IDS 262144 |
|
|
|
#else |
|
|
|
/* |
|
* Currently we have a one-to-one relationship between space IDs and |
|
* protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only |
|
* support 15 bit protection IDs, so that is the limiting factor. |
|
* PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's |
|
* probably not worth the effort for a special case here. |
|
*/ |
|
|
|
#define NR_SPACE_IDS 32768 |
|
|
|
#endif /* !CONFIG_PA20 */ |
|
|
|
#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) |
|
#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) |
|
|
|
static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ |
|
static unsigned long dirty_space_id[SID_ARRAY_SIZE]; |
|
static unsigned long space_id_index; |
|
static unsigned long free_space_ids = NR_SPACE_IDS - 1; |
|
static unsigned long dirty_space_ids = 0; |
|
|
|
static DEFINE_SPINLOCK(sid_lock); |
|
|
|
unsigned long alloc_sid(void) |
|
{ |
|
unsigned long index; |
|
|
|
spin_lock(&sid_lock); |
|
|
|
if (free_space_ids == 0) { |
|
if (dirty_space_ids != 0) { |
|
spin_unlock(&sid_lock); |
|
flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ |
|
spin_lock(&sid_lock); |
|
} |
|
BUG_ON(free_space_ids == 0); |
|
} |
|
|
|
free_space_ids--; |
|
|
|
index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); |
|
space_id[BIT_WORD(index)] |= BIT_MASK(index); |
|
space_id_index = index; |
|
|
|
spin_unlock(&sid_lock); |
|
|
|
return index << SPACEID_SHIFT; |
|
} |
|
|
|
void free_sid(unsigned long spaceid) |
|
{ |
|
unsigned long index = spaceid >> SPACEID_SHIFT; |
|
unsigned long *dirty_space_offset, mask; |
|
|
|
dirty_space_offset = &dirty_space_id[BIT_WORD(index)]; |
|
mask = BIT_MASK(index); |
|
|
|
spin_lock(&sid_lock); |
|
|
|
BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */ |
|
|
|
*dirty_space_offset |= mask; |
|
dirty_space_ids++; |
|
|
|
spin_unlock(&sid_lock); |
|
} |
|
|
|
|
|
#ifdef CONFIG_SMP |
|
static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) |
|
{ |
|
int i; |
|
|
|
/* NOTE: sid_lock must be held upon entry */ |
|
|
|
*ndirtyptr = dirty_space_ids; |
|
if (dirty_space_ids != 0) { |
|
for (i = 0; i < SID_ARRAY_SIZE; i++) { |
|
dirty_array[i] = dirty_space_id[i]; |
|
dirty_space_id[i] = 0; |
|
} |
|
dirty_space_ids = 0; |
|
} |
|
|
|
return; |
|
} |
|
|
|
static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) |
|
{ |
|
int i; |
|
|
|
/* NOTE: sid_lock must be held upon entry */ |
|
|
|
if (ndirty != 0) { |
|
for (i = 0; i < SID_ARRAY_SIZE; i++) { |
|
space_id[i] ^= dirty_array[i]; |
|
} |
|
|
|
free_space_ids += ndirty; |
|
space_id_index = 0; |
|
} |
|
} |
|
|
|
#else /* CONFIG_SMP */ |
|
|
|
static void recycle_sids(void) |
|
{ |
|
int i; |
|
|
|
/* NOTE: sid_lock must be held upon entry */ |
|
|
|
if (dirty_space_ids != 0) { |
|
for (i = 0; i < SID_ARRAY_SIZE; i++) { |
|
space_id[i] ^= dirty_space_id[i]; |
|
dirty_space_id[i] = 0; |
|
} |
|
|
|
free_space_ids += dirty_space_ids; |
|
dirty_space_ids = 0; |
|
space_id_index = 0; |
|
} |
|
} |
|
#endif |
|
|
|
/* |
|
* flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is |
|
* purged, we can safely reuse the space ids that were released but |
|
* not flushed from the tlb. |
|
*/ |
|
|
|
#ifdef CONFIG_SMP |
|
|
|
static unsigned long recycle_ndirty; |
|
static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; |
|
static unsigned int recycle_inuse; |
|
|
|
void flush_tlb_all(void) |
|
{ |
|
int do_recycle; |
|
|
|
__inc_irq_stat(irq_tlb_count); |
|
do_recycle = 0; |
|
spin_lock(&sid_lock); |
|
if (dirty_space_ids > RECYCLE_THRESHOLD) { |
|
BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
|
get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
|
recycle_inuse++; |
|
do_recycle++; |
|
} |
|
spin_unlock(&sid_lock); |
|
on_each_cpu(flush_tlb_all_local, NULL, 1); |
|
if (do_recycle) { |
|
spin_lock(&sid_lock); |
|
recycle_sids(recycle_ndirty,recycle_dirty_array); |
|
recycle_inuse = 0; |
|
spin_unlock(&sid_lock); |
|
} |
|
} |
|
#else |
|
void flush_tlb_all(void) |
|
{ |
|
__inc_irq_stat(irq_tlb_count); |
|
spin_lock(&sid_lock); |
|
flush_tlb_all_local(NULL); |
|
recycle_sids(); |
|
spin_unlock(&sid_lock); |
|
} |
|
#endif
|
|
|