104 строки
2.7 KiB
C
104 строки
2.7 KiB
C
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/*
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* Hypervisor-assisted dump
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*
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* Linas Vepstas, Manish Ahuja 2008
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* Copyright 2008 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/mm.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/phyp_dump.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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/* Variables, used to communicate data between early boot and late boot */
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static struct phyp_dump phyp_dump_vars;
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struct phyp_dump *phyp_dump_info = &phyp_dump_vars;
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/**
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* release_memory_range -- release memory previously lmb_reserved
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* @start_pfn: starting physical frame number
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* @nr_pages: number of pages to free.
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*
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* This routine will release memory that had been previously
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* lmb_reserved in early boot. The released memory becomes
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* available for genreal use.
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*/
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static void
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release_memory_range(unsigned long start_pfn, unsigned long nr_pages)
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{
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struct page *rpage;
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unsigned long end_pfn;
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long i;
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end_pfn = start_pfn + nr_pages;
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for (i = start_pfn; i <= end_pfn; i++) {
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rpage = pfn_to_page(i);
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if (PageReserved(rpage)) {
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ClearPageReserved(rpage);
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init_page_count(rpage);
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__free_page(rpage);
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totalram_pages++;
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}
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}
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}
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static int __init phyp_dump_setup(void)
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{
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unsigned long start_pfn, nr_pages;
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/* If no memory was reserved in early boot, there is nothing to do */
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if (phyp_dump_info->init_reserve_size == 0)
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return 0;
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/* Release memory that was reserved in early boot */
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start_pfn = PFN_DOWN(phyp_dump_info->init_reserve_start);
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nr_pages = PFN_DOWN(phyp_dump_info->init_reserve_size);
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release_memory_range(start_pfn, nr_pages);
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return 0;
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}
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machine_subsys_initcall(pseries, phyp_dump_setup);
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int __init early_init_dt_scan_phyp_dump(unsigned long node,
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const char *uname, int depth, void *data)
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{
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const unsigned int *sizes;
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phyp_dump_info->phyp_dump_configured = 0;
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phyp_dump_info->phyp_dump_is_active = 0;
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if (depth != 1 || strcmp(uname, "rtas") != 0)
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return 0;
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if (of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL))
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phyp_dump_info->phyp_dump_configured++;
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if (of_get_flat_dt_prop(node, "ibm,dump-kernel", NULL))
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phyp_dump_info->phyp_dump_is_active++;
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sizes = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
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NULL);
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if (!sizes)
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return 0;
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if (sizes[0] == 1)
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phyp_dump_info->cpu_state_size = *((unsigned long *)&sizes[1]);
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if (sizes[3] == 2)
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phyp_dump_info->hpte_region_size =
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*((unsigned long *)&sizes[4]);
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return 1;
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}
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