Initial import

1 files changed, 1740 insertions, 0 deletions

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
new file mode 100644
index 000000000..d366675e4
--- /dev/null
+++ b/arch/tile/kernel/setup.c
@@ -0,0 +1,1740 @@
+/*
+ * Copyright 2010 Tilera Corporation. 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, version 2.
+ *
+ *   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, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mmzone.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+#include <linux/node.h>
+#include <linux/cpu.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/kexec.h>
+#include <linux/pci.h>
+#include <linux/swiotlb.h>
+#include <linux/initrd.h>
+#include <linux/io.h>
+#include <linux/highmem.h>
+#include <linux/smp.h>
+#include <linux/timex.h>
+#include <linux/hugetlb.h>
+#include <linux/start_kernel.h>
+#include <linux/screen_info.h>
+#include <linux/tick.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/cacheflush.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <hv/hypervisor.h>
+#include <arch/interrupts.h>
+
+/* <linux/smp.h> doesn't provide this definition. */
+#ifndef CONFIG_SMP
+#define setup_max_cpus 1
+#endif
+
+static inline int ABS(int x) { return x >= 0 ? x : -x; }
+
+/* Chip information */
+char chip_model[64] __write_once;
+
+#ifdef CONFIG_VT
+struct screen_info screen_info;
+#endif
+
+struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
+EXPORT_SYMBOL(node_data);
+
+/* Information on the NUMA nodes that we compute early */
+unsigned long node_start_pfn[MAX_NUMNODES];
+unsigned long node_end_pfn[MAX_NUMNODES];
+unsigned long __initdata node_memmap_pfn[MAX_NUMNODES];
+unsigned long __initdata node_percpu_pfn[MAX_NUMNODES];
+unsigned long __initdata node_free_pfn[MAX_NUMNODES];
+
+static unsigned long __initdata node_percpu[MAX_NUMNODES];
+
+/*
+ * per-CPU stack and boot info.
+ */
+DEFINE_PER_CPU(unsigned long, boot_sp) =
+	(unsigned long)init_stack + THREAD_SIZE;
+
+#ifdef CONFIG_SMP
+DEFINE_PER_CPU(unsigned long, boot_pc) = (unsigned long)start_kernel;
+#else
+/*
+ * The variable must be __initdata since it references __init code.
+ * With CONFIG_SMP it is per-cpu data, which is exempt from validation.
+ */
+unsigned long __initdata boot_pc = (unsigned long)start_kernel;
+#endif
+
+#ifdef CONFIG_HIGHMEM
+/* Page frame index of end of lowmem on each controller. */
+unsigned long node_lowmem_end_pfn[MAX_NUMNODES];
+
+/* Number of pages that can be mapped into lowmem. */
+static unsigned long __initdata mappable_physpages;
+#endif
+
+/* Data on which physical memory controller corresponds to which NUMA node */
+int node_controller[MAX_NUMNODES] = { [0 ... MAX_NUMNODES-1] = -1 };
+
+#ifdef CONFIG_HIGHMEM
+/* Map information from VAs to PAs */
+unsigned long pbase_map[1 << (32 - HPAGE_SHIFT)]
+  __write_once __attribute__((aligned(L2_CACHE_BYTES)));
+EXPORT_SYMBOL(pbase_map);
+
+/* Map information from PAs to VAs */
+void *vbase_map[NR_PA_HIGHBIT_VALUES]
+  __write_once __attribute__((aligned(L2_CACHE_BYTES)));
+EXPORT_SYMBOL(vbase_map);
+#endif
+
+/* Node number as a function of the high PA bits */
+int highbits_to_node[NR_PA_HIGHBIT_VALUES] __write_once;
+EXPORT_SYMBOL(highbits_to_node);
+
+static unsigned int __initdata maxmem_pfn = -1U;
+static unsigned int __initdata maxnodemem_pfn[MAX_NUMNODES] = {
+	[0 ... MAX_NUMNODES-1] = -1U
+};
+static nodemask_t __initdata isolnodes;
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+enum { DEFAULT_PCI_RESERVE_MB = 64 };
+static unsigned int __initdata pci_reserve_mb = DEFAULT_PCI_RESERVE_MB;
+unsigned long __initdata pci_reserve_start_pfn = -1U;
+unsigned long __initdata pci_reserve_end_pfn = -1U;
+#endif
+
+static int __init setup_maxmem(char *str)
+{
+	unsigned long long maxmem;
+	if (str == NULL || (maxmem = memparse(str, NULL)) == 0)
+		return -EINVAL;
+
+	maxmem_pfn = (maxmem >> HPAGE_SHIFT) << (HPAGE_SHIFT - PAGE_SHIFT);
+	pr_info("Forcing RAM used to no more than %dMB\n",
+		maxmem_pfn >> (20 - PAGE_SHIFT));
+	return 0;
+}
+early_param("maxmem", setup_maxmem);
+
+static int __init setup_maxnodemem(char *str)
+{
+	char *endp;
+	unsigned long long maxnodemem;
+	long node;
+
+	node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;
+	if (node >= MAX_NUMNODES || *endp != ':')
+		return -EINVAL;
+
+	maxnodemem = memparse(endp+1, NULL);
+	maxnodemem_pfn[node] = (maxnodemem >> HPAGE_SHIFT) <<
+		(HPAGE_SHIFT - PAGE_SHIFT);
+	pr_info("Forcing RAM used on node %ld to no more than %dMB\n",
+		node, maxnodemem_pfn[node] >> (20 - PAGE_SHIFT));
+	return 0;
+}
+early_param("maxnodemem", setup_maxnodemem);
+
+struct memmap_entry {
+	u64 addr;	/* start of memory segment */
+	u64 size;	/* size of memory segment */
+};
+static struct memmap_entry memmap_map[64];
+static int memmap_nr;
+
+static void add_memmap_region(u64 addr, u64 size)
+{
+	if (memmap_nr >= ARRAY_SIZE(memmap_map)) {
+		pr_err("Ooops! Too many entries in the memory map!\n");
+		return;
+	}
+	memmap_map[memmap_nr].addr = addr;
+	memmap_map[memmap_nr].size = size;
+	memmap_nr++;
+}
+
+static int __init setup_memmap(char *p)
+{
+	char *oldp;
+	u64 start_at, mem_size;
+
+	if (!p)
+		return -EINVAL;
+
+	if (!strncmp(p, "exactmap", 8)) {
+		pr_err("\"memmap=exactmap\" not valid on tile\n");
+		return 0;
+	}
+
+	oldp = p;
+	mem_size = memparse(p, &p);
+	if (p == oldp)
+		return -EINVAL;
+
+	if (*p == '@') {
+		pr_err("\"memmap=nn@ss\" (force RAM) invalid on tile\n");
+	} else if (*p == '#') {
+		pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on tile\n");
+	} else if (*p == '$') {
+		start_at = memparse(p+1, &p);
+		add_memmap_region(start_at, mem_size);
+	} else {
+		if (mem_size == 0)
+			return -EINVAL;
+		maxmem_pfn = (mem_size >> HPAGE_SHIFT) <<
+			(HPAGE_SHIFT - PAGE_SHIFT);
+	}
+	return *p == '\0' ? 0 : -EINVAL;
+}
+early_param("memmap", setup_memmap);
+
+static int __init setup_mem(char *str)
+{
+	return setup_maxmem(str);
+}
+early_param("mem", setup_mem);  /* compatibility with x86 */
+
+static int __init setup_isolnodes(char *str)
+{
+	if (str == NULL || nodelist_parse(str, isolnodes) != 0)
+		return -EINVAL;
+
+	pr_info("Set isolnodes value to '%*pbl'\n",
+		nodemask_pr_args(&isolnodes));
+	return 0;
+}
+early_param("isolnodes", setup_isolnodes);
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+static int __init setup_pci_reserve(char* str)
+{
+	if (str == NULL || kstrtouint(str, 0, &pci_reserve_mb) != 0 ||
+	    pci_reserve_mb > 3 * 1024)
+		return -EINVAL;
+
+	pr_info("Reserving %dMB for PCIE root complex mappings\n",
+		pci_reserve_mb);
+	return 0;
+}
+early_param("pci_reserve", setup_pci_reserve);
+#endif
+
+#ifndef __tilegx__
+/*
+ * vmalloc=size forces the vmalloc area to be exactly 'size' bytes.
+ * This can be used to increase (or decrease) the vmalloc area.
+ */
+static int __init parse_vmalloc(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	VMALLOC_RESERVE = (memparse(arg, &arg) + PGDIR_SIZE - 1) & PGDIR_MASK;
+
+	/* See validate_va() for more on this test. */
+	if ((long)_VMALLOC_START >= 0)
+		early_panic("\"vmalloc=%#lx\" value too large: maximum %#lx\n",
+			    VMALLOC_RESERVE, _VMALLOC_END - 0x80000000UL);
+
+	return 0;
+}
+early_param("vmalloc", parse_vmalloc);
+#endif
+
+#ifdef CONFIG_HIGHMEM
+/*
+ * Determine for each controller where its lowmem is mapped and how much of
+ * it is mapped there.  On controller zero, the first few megabytes are
+ * already mapped in as code at MEM_SV_START, so in principle we could
+ * start our data mappings higher up, but for now we don't bother, to avoid
+ * additional confusion.
+ *
+ * One question is whether, on systems with more than 768 Mb and
+ * controllers of different sizes, to map in a proportionate amount of
+ * each one, or to try to map the same amount from each controller.
+ * (E.g. if we have three controllers with 256MB, 1GB, and 256MB
+ * respectively, do we map 256MB from each, or do we map 128 MB, 512
+ * MB, and 128 MB respectively?)  For now we use a proportionate
+ * solution like the latter.
+ *
+ * The VA/PA mapping demands that we align our decisions at 16 MB
+ * boundaries so that we can rapidly convert VA to PA.
+ */
+static void *__init setup_pa_va_mapping(void)
+{
+	unsigned long curr_pages = 0;
+	unsigned long vaddr = PAGE_OFFSET;
+	nodemask_t highonlynodes = isolnodes;
+	int i, j;
+
+	memset(pbase_map, -1, sizeof(pbase_map));
+	memset(vbase_map, -1, sizeof(vbase_map));
+
+	/* Node zero cannot be isolated for LOWMEM purposes. */
+	node_clear(0, highonlynodes);
+
+	/* Count up the number of pages on non-highonlynodes controllers. */
+	mappable_physpages = 0;
+	for_each_online_node(i) {
+		if (!node_isset(i, highonlynodes))
+			mappable_physpages +=
+				node_end_pfn[i] - node_start_pfn[i];
+	}
+
+	for_each_online_node(i) {
+		unsigned long start = node_start_pfn[i];
+		unsigned long end = node_end_pfn[i];
+		unsigned long size = end - start;
+		unsigned long vaddr_end;
+
+		if (node_isset(i, highonlynodes)) {
+			/* Mark this controller as having no lowmem. */
+			node_lowmem_end_pfn[i] = start;
+			continue;
+		}
+
+		curr_pages += size;
+		if (mappable_physpages > MAXMEM_PFN) {
+			vaddr_end = PAGE_OFFSET +
+				(((u64)curr_pages * MAXMEM_PFN /
+				  mappable_physpages)
+				 << PAGE_SHIFT);
+		} else {
+			vaddr_end = PAGE_OFFSET + (curr_pages << PAGE_SHIFT);
+		}
+		for (j = 0; vaddr < vaddr_end; vaddr += HPAGE_SIZE, ++j) {
+			unsigned long this_pfn =
+				start + (j << HUGETLB_PAGE_ORDER);
+			pbase_map[vaddr >> HPAGE_SHIFT] = this_pfn;
+			if (vbase_map[__pfn_to_highbits(this_pfn)] ==
+			    (void *)-1)
+				vbase_map[__pfn_to_highbits(this_pfn)] =
+					(void *)(vaddr & HPAGE_MASK);
+		}
+		node_lowmem_end_pfn[i] = start + (j << HUGETLB_PAGE_ORDER);
+		BUG_ON(node_lowmem_end_pfn[i] > end);
+	}
+
+	/* Return highest address of any mapped memory. */
+	return (void *)vaddr;
+}
+#endif /* CONFIG_HIGHMEM */
+
+/*
+ * Register our most important memory mappings with the debug stub.
+ *
+ * This is up to 4 mappings for lowmem, one mapping per memory
+ * controller, plus one for our text segment.
+ */
+static void store_permanent_mappings(void)
+{
+	int i;
+
+	for_each_online_node(i) {
+		HV_PhysAddr pa = ((HV_PhysAddr)node_start_pfn[i]) << PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+		HV_PhysAddr high_mapped_pa = node_lowmem_end_pfn[i];
+#else
+		HV_PhysAddr high_mapped_pa = node_end_pfn[i];
+#endif
+
+		unsigned long pages = high_mapped_pa - node_start_pfn[i];
+		HV_VirtAddr addr = (HV_VirtAddr) __va(pa);
+		hv_store_mapping(addr, pages << PAGE_SHIFT, pa);
+	}
+
+	hv_store_mapping((HV_VirtAddr)_text,
+			 (uint32_t)(_einittext - _text), 0);
+}
+
+/*
+ * Use hv_inquire_physical() to populate node_{start,end}_pfn[]
+ * and node_online_map, doing suitable sanity-checking.
+ * Also set min_low_pfn, max_low_pfn, and max_pfn.
+ */
+static void __init setup_memory(void)
+{
+	int i, j;
+	int highbits_seen[NR_PA_HIGHBIT_VALUES] = { 0 };
+#ifdef CONFIG_HIGHMEM
+	long highmem_pages;
+#endif
+#ifndef __tilegx__
+	int cap;
+#endif
+#if defined(CONFIG_HIGHMEM) || defined(__tilegx__)
+	long lowmem_pages;
+#endif
+	unsigned long physpages = 0;
+
+	/* We are using a char to hold the cpu_2_node[] mapping */
+	BUILD_BUG_ON(MAX_NUMNODES > 127);
+
+	/* Discover the ranges of memory available to us */
+	for (i = 0; ; ++i) {
+		unsigned long start, size, end, highbits;
+		HV_PhysAddrRange range = hv_inquire_physical(i);
+		if (range.size == 0)
+			break;
+#ifdef CONFIG_FLATMEM
+		if (i > 0) {
+			pr_err("Can't use discontiguous PAs: %#llx..%#llx\n",
+			       range.size, range.start + range.size);
+			continue;
+		}
+#endif
+#ifndef __tilegx__
+		if ((unsigned long)range.start) {
+			pr_err("Range not at 4GB multiple: %#llx..%#llx\n",
+			       range.start, range.start + range.size);
+			continue;
+		}
+#endif
+		if ((range.start & (HPAGE_SIZE-1)) != 0 ||
+		    (range.size & (HPAGE_SIZE-1)) != 0) {
+			unsigned long long start_pa = range.start;
+			unsigned long long orig_size = range.size;
+			range.start = (start_pa + HPAGE_SIZE - 1) & HPAGE_MASK;
+			range.size -= (range.start - start_pa);
+			range.size &= HPAGE_MASK;
+			pr_err("Range not hugepage-aligned: %#llx..%#llx: now %#llx-%#llx\n",
+			       start_pa, start_pa + orig_size,
+			       range.start, range.start + range.size);
+		}
+		highbits = __pa_to_highbits(range.start);
+		if (highbits >= NR_PA_HIGHBIT_VALUES) {
+			pr_err("PA high bits too high: %#llx..%#llx\n",
+			       range.start, range.start + range.size);
+			continue;
+		}
+		if (highbits_seen[highbits]) {
+			pr_err("Range overlaps in high bits: %#llx..%#llx\n",
+			       range.start, range.start + range.size);
+			continue;
+		}
+		highbits_seen[highbits] = 1;
+		if (PFN_DOWN(range.size) > maxnodemem_pfn[i]) {
+			int max_size = maxnodemem_pfn[i];
+			if (max_size > 0) {
+				pr_err("Maxnodemem reduced node %d to %d pages\n",
+				       i, max_size);
+				range.size = PFN_PHYS(max_size);
+			} else {
+				pr_err("Maxnodemem disabled node %d\n", i);
+				continue;
+			}
+		}
+		if (physpages + PFN_DOWN(range.size) > maxmem_pfn) {
+			int max_size = maxmem_pfn - physpages;
+			if (max_size > 0) {
+				pr_err("Maxmem reduced node %d to %d pages\n",
+				       i, max_size);
+				range.size = PFN_PHYS(max_size);
+			} else {
+				pr_err("Maxmem disabled node %d\n", i);
+				continue;
+			}
+		}
+		if (i >= MAX_NUMNODES) {
+			pr_err("Too many PA nodes (#%d): %#llx...%#llx\n",
+			       i, range.size, range.size + range.start);
+			continue;
+		}
+
+		start = range.start >> PAGE_SHIFT;
+		size = range.size >> PAGE_SHIFT;
+		end = start + size;
+
+#ifndef __tilegx__
+		if (((HV_PhysAddr)end << PAGE_SHIFT) !=
+		    (range.start + range.size)) {
+			pr_err("PAs too high to represent: %#llx..%#llx\n",
+			       range.start, range.start + range.size);
+			continue;
+		}
+#endif
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+		/*
+		 * Blocks that overlap the pci reserved region must
+		 * have enough space to hold the maximum percpu data
+		 * region at the top of the range.  If there isn't
+		 * enough space above the reserved region, just
+		 * truncate the node.
+		 */
+		if (start <= pci_reserve_start_pfn &&
+		    end > pci_reserve_start_pfn) {
+			unsigned int per_cpu_size =
+				__per_cpu_end - __per_cpu_start;
+			unsigned int percpu_pages =
+				NR_CPUS * (PFN_UP(per_cpu_size) >> PAGE_SHIFT);
+			if (end < pci_reserve_end_pfn + percpu_pages) {
+				end = pci_reserve_start_pfn;
+				pr_err("PCI mapping region reduced node %d to %ld pages\n",
+				       i, end - start);
+			}
+		}
+#endif
+
+		for (j = __pfn_to_highbits(start);
+		     j <= __pfn_to_highbits(end - 1); j++)
+			highbits_to_node[j] = i;
+
+		node_start_pfn[i] = start;
+		node_end_pfn[i] = end;
+		node_controller[i] = range.controller;
+		physpages += size;
+		max_pfn = end;
+
+		/* Mark node as online */
+		node_set(i, node_online_map);
+		node_set(i, node_possible_map);
+	}
+
+#ifndef __tilegx__
+	/*
+	 * For 4KB pages, mem_map "struct page" data is 1% of the size
+	 * of the physical memory, so can be quite big (640 MB for
+	 * four 16G zones).  These structures must be mapped in
+	 * lowmem, and since we currently cap out at about 768 MB,
+	 * it's impractical to try to use this much address space.
+	 * For now, arbitrarily cap the amount of physical memory
+	 * we're willing to use at 8 million pages (32GB of 4KB pages).
+	 */
+	cap = 8 * 1024 * 1024;  /* 8 million pages */
+	if (physpages > cap) {
+		int num_nodes = num_online_nodes();
+		int cap_each = cap / num_nodes;
+		unsigned long dropped_pages = 0;
+		for (i = 0; i < num_nodes; ++i) {
+			int size = node_end_pfn[i] - node_start_pfn[i];
+			if (size > cap_each) {
+				dropped_pages += (size - cap_each);
+				node_end_pfn[i] = node_start_pfn[i] + cap_each;
+			}
+		}
+		physpages -= dropped_pages;
+		pr_warn("Only using %ldMB memory - ignoring %ldMB\n",
+			physpages >> (20 - PAGE_SHIFT),
+			dropped_pages >> (20 - PAGE_SHIFT));
+		pr_warn("Consider using a larger page size\n");
+	}
+#endif
+
+	/* Heap starts just above the last loaded address. */
+	min_low_pfn = PFN_UP((unsigned long)_end - PAGE_OFFSET);
+
+#ifdef CONFIG_HIGHMEM
+	/* Find where we map lowmem from each controller. */
+	high_memory = setup_pa_va_mapping();
+
+	/* Set max_low_pfn based on what node 0 can directly address. */
+	max_low_pfn = node_lowmem_end_pfn[0];
+
+	lowmem_pages = (mappable_physpages > MAXMEM_PFN) ?
+		MAXMEM_PFN : mappable_physpages;
+	highmem_pages = (long) (physpages - lowmem_pages);
+
+	pr_notice("%ldMB HIGHMEM available\n",
+		  pages_to_mb(highmem_pages > 0 ? highmem_pages : 0));
+	pr_notice("%ldMB LOWMEM available\n", pages_to_mb(lowmem_pages));
+#else
+	/* Set max_low_pfn based on what node 0 can directly address. */
+	max_low_pfn = node_end_pfn[0];
+
+#ifndef __tilegx__
+	if (node_end_pfn[0] > MAXMEM_PFN) {
+		pr_warn("Only using %ldMB LOWMEM\n", MAXMEM >> 20);
+		pr_warn("Use a HIGHMEM enabled kernel\n");
+		max_low_pfn = MAXMEM_PFN;
+		max_pfn = MAXMEM_PFN;
+		node_end_pfn[0] = MAXMEM_PFN;
+	} else {
+		pr_notice("%ldMB memory available\n",
+			  pages_to_mb(node_end_pfn[0]));
+	}
+	for (i = 1; i < MAX_NUMNODES; ++i) {
+		node_start_pfn[i] = 0;
+		node_end_pfn[i] = 0;
+	}
+	high_memory = __va(node_end_pfn[0]);
+#else
+	lowmem_pages = 0;
+	for (i = 0; i < MAX_NUMNODES; ++i) {
+		int pages = node_end_pfn[i] - node_start_pfn[i];
+		lowmem_pages += pages;
+		if (pages)
+			high_memory = pfn_to_kaddr(node_end_pfn[i]);
+	}
+	pr_notice("%ldMB memory available\n", pages_to_mb(lowmem_pages));
+#endif
+#endif
+}
+
+/*
+ * On 32-bit machines, we only put bootmem on the low controller,
+ * since PAs > 4GB can't be used in bootmem.  In principle one could
+ * imagine, e.g., multiple 1 GB controllers all of which could support
+ * bootmem, but in practice using controllers this small isn't a
+ * particularly interesting scenario, so we just keep it simple and
+ * use only the first controller for bootmem on 32-bit machines.
+ */
+static inline int node_has_bootmem(int nid)
+{
+#ifdef CONFIG_64BIT
+	return 1;
+#else
+	return nid == 0;
+#endif
+}
+
+static inline unsigned long alloc_bootmem_pfn(int nid,
+					      unsigned long size,
+					      unsigned long goal)
+{
+	void *kva = __alloc_bootmem_node(NODE_DATA(nid), size,
+					 PAGE_SIZE, goal);
+	unsigned long pfn = kaddr_to_pfn(kva);
+	BUG_ON(goal && PFN_PHYS(pfn) != goal);
+	return pfn;
+}
+
+static void __init setup_bootmem_allocator_node(int i)
+{
+	unsigned long start, end, mapsize, mapstart;
+
+	if (node_has_bootmem(i)) {
+		NODE_DATA(i)->bdata = &bootmem_node_data[i];
+	} else {
+		/* Share controller zero's bdata for now. */
+		NODE_DATA(i)->bdata = &bootmem_node_data[0];
+		return;
+	}
+
+	/* Skip up to after the bss in node 0. */
+	start = (i == 0) ? min_low_pfn : node_start_pfn[i];
+
+	/* Only lowmem, if we're a HIGHMEM build. */
+#ifdef CONFIG_HIGHMEM
+	end = node_lowmem_end_pfn[i];
+#else
+	end = node_end_pfn[i];
+#endif
+
+	/* No memory here. */
+	if (end == start)
+		return;
+
+	/* Figure out where the bootmem bitmap is located. */
+	mapsize = bootmem_bootmap_pages(end - start);
+	if (i == 0) {
+		/* Use some space right before the heap on node 0. */
+		mapstart = start;
+		start += mapsize;
+	} else {
+		/* Allocate bitmap on node 0 to avoid page table issues. */
+		mapstart = alloc_bootmem_pfn(0, PFN_PHYS(mapsize), 0);
+	}
+
+	/* Initialize a node. */
+	init_bootmem_node(NODE_DATA(i), mapstart, start, end);
+
+	/* Free all the space back into the allocator. */
+	free_bootmem(PFN_PHYS(start), PFN_PHYS(end - start));
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+	/*
+	 * Throw away any memory aliased by the PCI region.
+	 */
+	if (pci_reserve_start_pfn < end && pci_reserve_end_pfn > start) {
+		start = max(pci_reserve_start_pfn, start);
+		end = min(pci_reserve_end_pfn, end);
+		reserve_bootmem(PFN_PHYS(start), PFN_PHYS(end - start),
+				BOOTMEM_EXCLUSIVE);
+	}
+#endif
+}
+
+static void __init setup_bootmem_allocator(void)
+{
+	int i;
+	for (i = 0; i < MAX_NUMNODES; ++i)
+		setup_bootmem_allocator_node(i);
+
+	/* Reserve any memory excluded by "memmap" arguments. */
+	for (i = 0; i < memmap_nr; ++i) {
+		struct memmap_entry *m = &memmap_map[i];
+		reserve_bootmem(m->addr, m->size, BOOTMEM_DEFAULT);
+	}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start) {
+		/* Make sure the initrd memory region is not modified. */
+		if (reserve_bootmem(initrd_start, initrd_end - initrd_start,
+				    BOOTMEM_EXCLUSIVE)) {
+			pr_crit("The initrd memory region has been polluted. Disabling it.\n");
+			initrd_start = 0;
+			initrd_end = 0;
+		} else {
+			/*
+			 * Translate initrd_start & initrd_end from PA to VA for
+			 * future access.
+			 */
+			initrd_start += PAGE_OFFSET;
+			initrd_end += PAGE_OFFSET;
+		}
+	}
+#endif
+
+#ifdef CONFIG_KEXEC
+	if (crashk_res.start != crashk_res.end)
+		reserve_bootmem(crashk_res.start, resource_size(&crashk_res),
+				BOOTMEM_DEFAULT);
+#endif
+}
+
+void *__init alloc_remap(int nid, unsigned long size)
+{
+	int pages = node_end_pfn[nid] - node_start_pfn[nid];
+	void *map = pfn_to_kaddr(node_memmap_pfn[nid]);
+	BUG_ON(size != pages * sizeof(struct page));
+	memset(map, 0, size);
+	return map;
+}
+
+static int __init percpu_size(void)
+{
+	int size = __per_cpu_end - __per_cpu_start;
+	size += PERCPU_MODULE_RESERVE;
+	size += PERCPU_DYNAMIC_EARLY_SIZE;
+	if (size < PCPU_MIN_UNIT_SIZE)
+		size = PCPU_MIN_UNIT_SIZE;
+	size = roundup(size, PAGE_SIZE);
+
+	/* In several places we assume the per-cpu data fits on a huge page. */
+	BUG_ON(kdata_huge && size > HPAGE_SIZE);
+	return size;
+}
+
+static void __init zone_sizes_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES] = { 0 };
+	int size = percpu_size();
+	int num_cpus = smp_height * smp_width;
+	const unsigned long dma_end = (1UL << (32 - PAGE_SHIFT));
+
+	int i;
+
+	for (i = 0; i < num_cpus; ++i)
+		node_percpu[cpu_to_node(i)] += size;
+
+	for_each_online_node(i) {
+		unsigned long start = node_start_pfn[i];
+		unsigned long end = node_end_pfn[i];
+#ifdef CONFIG_HIGHMEM
+		unsigned long lowmem_end = node_lowmem_end_pfn[i];
+#else
+		unsigned long lowmem_end = end;
+#endif
+		int memmap_size = (end - start) * sizeof(struct page);
+		node_free_pfn[i] = start;
+
+		/*
+		 * Set aside pages for per-cpu data and the mem_map array.
+		 *
+		 * Since the per-cpu data requires special homecaching,
+		 * if we are in kdata_huge mode, we put it at the end of
+		 * the lowmem region.  If we're not in kdata_huge mode,
+		 * we take the per-cpu pages from the bottom of the
+		 * controller, since that avoids fragmenting a huge page
+		 * that users might want.  We always take the memmap
+		 * from the bottom of the controller, since with
+		 * kdata_huge that lets it be under a huge TLB entry.
+		 *
+		 * If the user has requested isolnodes for a controller,
+		 * though, there'll be no lowmem, so we just alloc_bootmem
+		 * the memmap.  There will be no percpu memory either.
+		 */
+		if (i != 0 && node_isset(i, isolnodes)) {
+			node_memmap_pfn[i] =
+				alloc_bootmem_pfn(0, memmap_size, 0);
+			BUG_ON(node_percpu[i] != 0);
+		} else if (node_has_bootmem(start)) {
+			unsigned long goal = 0;
+			node_memmap_pfn[i] =
+				alloc_bootmem_pfn(i, memmap_size, 0);
+			if (kdata_huge)
+				goal = PFN_PHYS(lowmem_end) - node_percpu[i];
+			if (node_percpu[i])
+				node_percpu_pfn[i] =
+					alloc_bootmem_pfn(i, node_percpu[i],
+							  goal);
+		} else {
+			/* In non-bootmem zones, just reserve some pages. */
+			node_memmap_pfn[i] = node_free_pfn[i];
+			node_free_pfn[i] += PFN_UP(memmap_size);
+			if (!kdata_huge) {
+				node_percpu_pfn[i] = node_free_pfn[i];
+				node_free_pfn[i] += PFN_UP(node_percpu[i]);
+			} else {
+				node_percpu_pfn[i] =
+					lowmem_end - PFN_UP(node_percpu[i]);
+			}
+		}
+
+#ifdef CONFIG_HIGHMEM
+		if (start > lowmem_end) {
+			zones_size[ZONE_NORMAL] = 0;
+			zones_size[ZONE_HIGHMEM] = end - start;
+		} else {
+			zones_size[ZONE_NORMAL] = lowmem_end - start;
+			zones_size[ZONE_HIGHMEM] = end - lowmem_end;
+		}
+#else
+		zones_size[ZONE_NORMAL] = end - start;
+#endif
+
+		if (start < dma_end) {
+			zones_size[ZONE_DMA] = min(zones_size[ZONE_NORMAL],
+						   dma_end - start);
+			zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA];
+		} else {
+			zones_size[ZONE_DMA] = 0;
+		}
+
+		/* Take zone metadata from controller 0 if we're isolnode. */
+		if (node_isset(i, isolnodes))
+			NODE_DATA(i)->bdata = &bootmem_node_data[0];
+
+		free_area_init_node(i, zones_size, start, NULL);
+		printk(KERN_DEBUG "  Normal zone: %ld per-cpu pages\n",
+		       PFN_UP(node_percpu[i]));
+
+		/* Track the type of memory on each node */
+		if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA])
+			node_set_state(i, N_NORMAL_MEMORY);
+#ifdef CONFIG_HIGHMEM
+		if (end != start)
+			node_set_state(i, N_HIGH_MEMORY);
+#endif
+
+		node_set_online(i);
+	}
+}
+
+#ifdef CONFIG_NUMA
+
+/* which logical CPUs are on which nodes */
+struct cpumask node_2_cpu_mask[MAX_NUMNODES] __write_once;
+EXPORT_SYMBOL(node_2_cpu_mask);
+
+/* which node each logical CPU is on */
+char cpu_2_node[NR_CPUS] __write_once __attribute__((aligned(L2_CACHE_BYTES)));
+EXPORT_SYMBOL(cpu_2_node);
+
+/* Return cpu_to_node() except for cpus not yet assigned, which return -1 */
+static int __init cpu_to_bound_node(int cpu, struct cpumask* unbound_cpus)
+{
+	if (!cpu_possible(cpu) || cpumask_test_cpu(cpu, unbound_cpus))
+		return -1;
+	else
+		return cpu_to_node(cpu);
+}
+
+/* Return number of immediately-adjacent tiles sharing the same NUMA node. */
+static int __init node_neighbors(int node, int cpu,
+				 struct cpumask *unbound_cpus)
+{
+	int neighbors = 0;
+	int w = smp_width;
+	int h = smp_height;
+	int x = cpu % w;
+	int y = cpu / w;
+	if (x > 0 && cpu_to_bound_node(cpu-1, unbound_cpus) == node)
+		++neighbors;
+	if (x < w-1 && cpu_to_bound_node(cpu+1, unbound_cpus) == node)
+		++neighbors;
+	if (y > 0 && cpu_to_bound_node(cpu-w, unbound_cpus) == node)
+		++neighbors;
+	if (y < h-1 && cpu_to_bound_node(cpu+w, unbound_cpus) == node)
+		++neighbors;
+	return neighbors;
+}
+
+static void __init setup_numa_mapping(void)
+{
+	int distance[MAX_NUMNODES][NR_CPUS];
+	HV_Coord coord;
+	int cpu, node, cpus, i, x, y;
+	int num_nodes = num_online_nodes();
+	struct cpumask unbound_cpus;
+	nodemask_t default_nodes;
+
+	cpumask_clear(&unbound_cpus);
+
+	/* Get set of nodes we will use for defaults */
+	nodes_andnot(default_nodes, node_online_map, isolnodes);
+	if (nodes_empty(default_nodes)) {
+		BUG_ON(!node_isset(0, node_online_map));
+		pr_err("Forcing NUMA node zero available as a default node\n");
+		node_set(0, default_nodes);
+	}
+
+	/* Populate the distance[] array */
+	memset(distance, -1, sizeof(distance));
+	cpu = 0;
+	for (coord.y = 0; coord.y < smp_height; ++coord.y) {
+		for (coord.x = 0; coord.x < smp_width;
+		     ++coord.x, ++cpu) {
+			BUG_ON(cpu >= nr_cpu_ids);
+			if (!cpu_possible(cpu)) {
+				cpu_2_node[cpu] = -1;
+				continue;
+			}
+			for_each_node_mask(node, default_nodes) {
+				HV_MemoryControllerInfo info =
+					hv_inquire_memory_controller(
+						coord, node_controller[node]);
+				distance[node][cpu] =
+					ABS(info.coord.x) + ABS(info.coord.y);
+			}
+			cpumask_set_cpu(cpu, &unbound_cpus);
+		}
+	}
+	cpus = cpu;
+
+	/*
+	 * Round-robin through the NUMA nodes until all the cpus are
+	 * assigned.  We could be more clever here (e.g. create four
+	 * sorted linked lists on the same set of cpu nodes, and pull
+	 * off them in round-robin sequence, removing from all four
+	 * lists each time) but given the relatively small numbers
+	 * involved, O(n^2) seem OK for a one-time cost.
+	 */
+	node = first_node(default_nodes);
+	while (!cpumask_empty(&unbound_cpus)) {
+		int best_cpu = -1;
+		int best_distance = INT_MAX;
+		for (cpu = 0; cpu < cpus; ++cpu) {
+			if (cpumask_test_cpu(cpu, &unbound_cpus)) {
+				/*
+				 * Compute metric, which is how much
+				 * closer the cpu is to this memory
+				 * controller than the others, shifted
+				 * up, and then the number of
+				 * neighbors already in the node as an
+				 * epsilon adjustment to try to keep
+				 * the nodes compact.
+				 */
+				int d = distance[node][cpu] * num_nodes;
+				for_each_node_mask(i, default_nodes) {
+					if (i != node)
+						d -= distance[i][cpu];
+				}
+				d *= 8;  /* allow space for epsilon */
+				d -= node_neighbors(node, cpu, &unbound_cpus);
+				if (d < best_distance) {
+					best_cpu = cpu;
+					best_distance = d;
+				}
+			}
+		}
+		BUG_ON(best_cpu < 0);
+		cpumask_set_cpu(best_cpu, &node_2_cpu_mask[node]);
+		cpu_2_node[best_cpu] = node;
+		cpumask_clear_cpu(best_cpu, &unbound_cpus);
+		node = next_node(node, default_nodes);
+		if (node == MAX_NUMNODES)
+			node = first_node(default_nodes);
+	}
+
+	/* Print out node assignments and set defaults for disabled cpus */
+	cpu = 0;
+	for (y = 0; y < smp_height; ++y) {
+		printk(KERN_DEBUG "NUMA cpu-to-node row %d:", y);
+		for (x = 0; x < smp_width; ++x, ++cpu) {
+			if (cpu_to_node(cpu) < 0) {
+				pr_cont(" -");
+				cpu_2_node[cpu] = first_node(default_nodes);
+			} else {
+				pr_cont(" %d", cpu_to_node(cpu));
+			}
+		}
+		pr_cont("\n");
+	}
+}
+
+static struct cpu cpu_devices[NR_CPUS];
+
+static int __init topology_init(void)
+{
+	int i;
+
+	for_each_online_node(i)
+		register_one_node(i);
+
+	for (i = 0; i < smp_height * smp_width; ++i)
+		register_cpu(&cpu_devices[i], i);
+
+	return 0;
+}
+
+subsys_initcall(topology_init);
+
+#else /* !CONFIG_NUMA */
+
+#define setup_numa_mapping() do { } while (0)
+
+#endif /* CONFIG_NUMA */
+
+/*
+ * Initialize hugepage support on this cpu.  We do this on all cores
+ * early in boot: before argument parsing for the boot cpu, and after
+ * argument parsing but before the init functions run on the secondaries.
+ * So the values we set up here in the hypervisor may be overridden on
+ * the boot cpu as arguments are parsed.
+ */
+static void init_super_pages(void)
+{
+#ifdef CONFIG_HUGETLB_SUPER_PAGES
+	int i;
+	for (i = 0; i < HUGE_SHIFT_ENTRIES; ++i)
+		hv_set_pte_super_shift(i, huge_shift[i]);
+#endif
+}
+
+/**
+ * setup_cpu() - Do all necessary per-cpu, tile-specific initialization.
+ * @boot: Is this the boot cpu?
+ *
+ * Called from setup_arch() on the boot cpu, or online_secondary().
+ */
+void setup_cpu(int boot)
+{
+	/* The boot cpu sets up its permanent mappings much earlier. */
+	if (!boot)
+		store_permanent_mappings();
+
+	/* Allow asynchronous TLB interrupts. */
+#if CHIP_HAS_TILE_DMA()
+	arch_local_irq_unmask(INT_DMATLB_MISS);
+	arch_local_irq_unmask(INT_DMATLB_ACCESS);
+#endif
+#ifdef __tilegx__
+	arch_local_irq_unmask(INT_SINGLE_STEP_K);
+#endif
+
+	/*
+	 * Allow user access to many generic SPRs, like the cycle
+	 * counter, PASS/FAIL/DONE, INTERRUPT_CRITICAL_SECTION, etc.
+	 */
+	__insn_mtspr(SPR_MPL_WORLD_ACCESS_SET_0, 1);
+
+#if CHIP_HAS_SN()
+	/* Static network is not restricted. */
+	__insn_mtspr(SPR_MPL_SN_ACCESS_SET_0, 1);
+#endif
+
+	/*
+	 * Set the MPL for interrupt control 0 & 1 to the corresponding
+	 * values.  This includes access to the SYSTEM_SAVE and EX_CONTEXT
+	 * SPRs, as well as the interrupt mask.
+	 */
+	__insn_mtspr(SPR_MPL_INTCTRL_0_SET_0, 1);
+	__insn_mtspr(SPR_MPL_INTCTRL_1_SET_1, 1);
+
+	/* Initialize IRQ support for this cpu. */
+	setup_irq_regs();
+
+#ifdef CONFIG_HARDWALL
+	/* Reset the network state on this cpu. */
+	reset_network_state();
+#endif
+
+	init_super_pages();
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __initdata set_initramfs_file;
+static char __initdata initramfs_file[128] = "initramfs";
+
+static int __init setup_initramfs_file(char *str)
+{
+	if (str == NULL)
+		return -EINVAL;
+	strncpy(initramfs_file, str, sizeof(initramfs_file) - 1);
+	set_initramfs_file = 1;
+
+	return 0;
+}
+early_param("initramfs_file", setup_initramfs_file);
+
+/*
+ * We look for a file called "initramfs" in the hvfs.  If there is one, we
+ * allocate some memory for it and it will be unpacked to the initramfs.
+ * If it's compressed, the initd code will uncompress it first.
+ */
+static void __init load_hv_initrd(void)
+{
+	HV_FS_StatInfo stat;
+	int fd, rc;
+	void *initrd;
+
+	/* If initrd has already been set, skip initramfs file in hvfs. */
+	if (initrd_start)
+		return;
+
+	fd = hv_fs_findfile((HV_VirtAddr) initramfs_file);
+	if (fd == HV_ENOENT) {
+		if (set_initramfs_file) {
+			pr_warn("No such hvfs initramfs file '%s'\n",
+				initramfs_file);
+			return;
+		} else {
+			/* Try old backwards-compatible name. */
+			fd = hv_fs_findfile((HV_VirtAddr)"initramfs.cpio.gz");
+			if (fd == HV_ENOENT)
+				return;
+		}
+	}
+	BUG_ON(fd < 0);
+	stat = hv_fs_fstat(fd);
+	BUG_ON(stat.size < 0);
+	if (stat.flags & HV_FS_ISDIR) {
+		pr_warn("Ignoring hvfs file '%s': it's a directory\n",
+			initramfs_file);
+		return;
+	}
+	initrd = alloc_bootmem_pages(stat.size);
+	rc = hv_fs_pread(fd, (HV_VirtAddr) initrd, stat.size, 0);
+	if (rc != stat.size) {
+		pr_err("Error reading %d bytes from hvfs file '%s': %d\n",
+		       stat.size, initramfs_file, rc);
+		free_initrd_mem((unsigned long) initrd, stat.size);
+		return;
+	}
+	initrd_start = (unsigned long) initrd;
+	initrd_end = initrd_start + stat.size;
+}
+
+void __init free_initrd_mem(unsigned long begin, unsigned long end)
+{
+	free_bootmem(__pa(begin), end - begin);
+}
+
+static int __init setup_initrd(char *str)
+{
+	char *endp;
+	unsigned long initrd_size;
+
+	initrd_size = str ? simple_strtoul(str, &endp, 0) : 0;
+	if (initrd_size == 0 || *endp != '@')
+		return -EINVAL;
+
+	initrd_start = simple_strtoul(endp+1, &endp, 0);
+	if (initrd_start == 0)
+		return -EINVAL;
+
+	initrd_end = initrd_start + initrd_size;
+
+	return 0;
+}
+early_param("initrd", setup_initrd);
+
+#else
+static inline void load_hv_initrd(void) {}
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+static void __init validate_hv(void)
+{
+	/*
+	 * It may already be too late, but let's check our built-in
+	 * configuration against what the hypervisor is providing.
+	 */
+	unsigned long glue_size = hv_sysconf(HV_SYSCONF_GLUE_SIZE);
+	int hv_page_size = hv_sysconf(HV_SYSCONF_PAGE_SIZE_SMALL);
+	int hv_hpage_size = hv_sysconf(HV_SYSCONF_PAGE_SIZE_LARGE);
+	HV_ASIDRange asid_range;
+
+#ifndef CONFIG_SMP
+	HV_Topology topology = hv_inquire_topology();
+	BUG_ON(topology.coord.x != 0 || topology.coord.y != 0);
+	if (topology.width != 1 || topology.height != 1) {
+		pr_warn("Warning: booting UP kernel on %dx%d grid; will ignore all but first tile\n",
+			topology.width, topology.height);
+	}
+#endif
+
+	if (PAGE_OFFSET + HV_GLUE_START_CPA + glue_size > (unsigned long)_text)
+		early_panic("Hypervisor glue size %ld is too big!\n",
+			    glue_size);
+	if (hv_page_size != PAGE_SIZE)
+		early_panic("Hypervisor page size %#x != our %#lx\n",
+			    hv_page_size, PAGE_SIZE);
+	if (hv_hpage_size != HPAGE_SIZE)
+		early_panic("Hypervisor huge page size %#x != our %#lx\n",
+			    hv_hpage_size, HPAGE_SIZE);
+
+#ifdef CONFIG_SMP
+	/*
+	 * Some hypervisor APIs take a pointer to a bitmap array
+	 * whose size is at least the number of cpus on the chip.
+	 * We use a struct cpumask for this, so it must be big enough.
+	 */
+	if ((smp_height * smp_width) > nr_cpu_ids)
+		early_panic("Hypervisor %d x %d grid too big for Linux NR_CPUS %d\n",
+			    smp_height, smp_width, nr_cpu_ids);
+#endif
+
+	/*
+	 * Check that we're using allowed ASIDs, and initialize the
+	 * various asid variables to their appropriate initial states.
+	 */
+	asid_range = hv_inquire_asid(0);
+	min_asid = asid_range.start;
+	__this_cpu_write(current_asid, min_asid);
+	max_asid = asid_range.start + asid_range.size - 1;
+
+	if (hv_confstr(HV_CONFSTR_CHIP_MODEL, (HV_VirtAddr)chip_model,
+		       sizeof(chip_model)) < 0) {
+		pr_err("Warning: HV_CONFSTR_CHIP_MODEL not available\n");
+		strlcpy(chip_model, "unknown", sizeof(chip_model));
+	}
+}
+
+static void __init validate_va(void)
+{
+#ifndef __tilegx__   /* FIXME: GX: probably some validation relevant here */
+	/*
+	 * Similarly, make sure we're only using allowed VAs.
+	 * We assume we can contiguously use MEM_USER_INTRPT .. MEM_HV_START,
+	 * and 0 .. KERNEL_HIGH_VADDR.
+	 * In addition, make sure we CAN'T use the end of memory, since
+	 * we use the last chunk of each pgd for the pgd_list.
+	 */
+	int i, user_kernel_ok = 0;
+	unsigned long max_va = 0;
+	unsigned long list_va =
+		((PGD_LIST_OFFSET / sizeof(pgd_t)) << PGDIR_SHIFT);
+
+	for (i = 0; ; ++i) {
+		HV_VirtAddrRange range = hv_inquire_virtual(i);
+		if (range.size == 0)
+			break;
+		if (range.start <= MEM_USER_INTRPT &&
+		    range.start + range.size >= MEM_HV_START)
+			user_kernel_ok = 1;
+		if (range.start == 0)
+			max_va = range.size;
+		BUG_ON(range.start + range.size > list_va);
+	}
+	if (!user_kernel_ok)
+		early_panic("Hypervisor not configured for user/kernel VAs\n");
+	if (max_va == 0)
+		early_panic("Hypervisor not configured for low VAs\n");
+	if (max_va < KERNEL_HIGH_VADDR)
+		early_panic("Hypervisor max VA %#lx smaller than %#lx\n",
+			    max_va, KERNEL_HIGH_VADDR);
+
+	/* Kernel PCs must have their high bit set; see intvec.S. */
+	if ((long)VMALLOC_START >= 0)
+		early_panic("Linux VMALLOC region below the 2GB line (%#lx)!\n"
+			    "Reconfigure the kernel with smaller VMALLOC_RESERVE\n",
+			    VMALLOC_START);
+#endif
+}
+
+/*
+ * cpu_lotar_map lists all the cpus that are valid for the supervisor
+ * to cache data on at a page level, i.e. what cpus can be placed in
+ * the LOTAR field of a PTE.  It is equivalent to the set of possible
+ * cpus plus any other cpus that are willing to share their cache.
+ * It is set by hv_inquire_tiles(HV_INQ_TILES_LOTAR).
+ */
+struct cpumask __write_once cpu_lotar_map;
+EXPORT_SYMBOL(cpu_lotar_map);
+
+/*
+ * hash_for_home_map lists all the tiles that hash-for-home data
+ * will be cached on.  Note that this may includes tiles that are not
+ * valid for this supervisor to use otherwise (e.g. if a hypervisor
+ * device is being shared between multiple supervisors).
+ * It is set by hv_inquire_tiles(HV_INQ_TILES_HFH_CACHE).
+ */
+struct cpumask hash_for_home_map;
+EXPORT_SYMBOL(hash_for_home_map);
+
+/*
+ * cpu_cacheable_map lists all the cpus whose caches the hypervisor can
+ * flush on our behalf.  It is set to cpu_possible_mask OR'ed with
+ * hash_for_home_map, and it is what should be passed to
+ * hv_flush_remote() to flush all caches.  Note that if there are
+ * dedicated hypervisor driver tiles that have authorized use of their
+ * cache, those tiles will only appear in cpu_lotar_map, NOT in
+ * cpu_cacheable_map, as they are a special case.
+ */
+struct cpumask __write_once cpu_cacheable_map;
+EXPORT_SYMBOL(cpu_cacheable_map);
+
+static __initdata struct cpumask disabled_map;
+
+static int __init disabled_cpus(char *str)
+{
+	int boot_cpu = smp_processor_id();
+
+	if (str == NULL || cpulist_parse_crop(str, &disabled_map) != 0)
+		return -EINVAL;
+	if (cpumask_test_cpu(boot_cpu, &disabled_map)) {
+		pr_err("disabled_cpus: can't disable boot cpu %d\n", boot_cpu);
+		cpumask_clear_cpu(boot_cpu, &disabled_map);
+	}
+	return 0;
+}
+
+early_param("disabled_cpus", disabled_cpus);
+
+void __init print_disabled_cpus(void)
+{
+	if (!cpumask_empty(&disabled_map))
+		pr_info("CPUs not available for Linux: %*pbl\n",
+			cpumask_pr_args(&disabled_map));
+}
+
+static void __init setup_cpu_maps(void)
+{
+	struct cpumask hv_disabled_map, cpu_possible_init;
+	int boot_cpu = smp_processor_id();
+	int cpus, i, rc;
+
+	/* Learn which cpus are allowed by the hypervisor. */
+	rc = hv_inquire_tiles(HV_INQ_TILES_AVAIL,
+			      (HV_VirtAddr) cpumask_bits(&cpu_possible_init),
+			      sizeof(cpu_cacheable_map));
+	if (rc < 0)
+		early_panic("hv_inquire_tiles(AVAIL) failed: rc %d\n", rc);
+	if (!cpumask_test_cpu(boot_cpu, &cpu_possible_init))
+		early_panic("Boot CPU %d disabled by hypervisor!\n", boot_cpu);
+
+	/* Compute the cpus disabled by the hvconfig file. */
+	cpumask_complement(&hv_disabled_map, &cpu_possible_init);
+
+	/* Include them with the cpus disabled by "disabled_cpus". */
+	cpumask_or(&disabled_map, &disabled_map, &hv_disabled_map);
+
+	/*
+	 * Disable every cpu after "setup_max_cpus".  But don't mark
+	 * as disabled the cpus that are outside of our initial rectangle,
+	 * since that turns out to be confusing.
+	 */
+	cpus = 1;                          /* this cpu */
+	cpumask_set_cpu(boot_cpu, &disabled_map);   /* ignore this cpu */
+	for (i = 0; cpus < setup_max_cpus; ++i)
+		if (!cpumask_test_cpu(i, &disabled_map))
+			++cpus;
+	for (; i < smp_height * smp_width; ++i)
+		cpumask_set_cpu(i, &disabled_map);
+	cpumask_clear_cpu(boot_cpu, &disabled_map); /* reset this cpu */
+	for (i = smp_height * smp_width; i < NR_CPUS; ++i)
+		cpumask_clear_cpu(i, &disabled_map);
+
+	/*
+	 * Setup cpu_possible map as every cpu allocated to us, minus
+	 * the results of any "disabled_cpus" settings.
+	 */
+	cpumask_andnot(&cpu_possible_init, &cpu_possible_init, &disabled_map);
+	init_cpu_possible(&cpu_possible_init);
+
+	/* Learn which cpus are valid for LOTAR caching. */
+	rc = hv_inquire_tiles(HV_INQ_TILES_LOTAR,
+			      (HV_VirtAddr) cpumask_bits(&cpu_lotar_map),
+			      sizeof(cpu_lotar_map));
+	if (rc < 0) {
+		pr_err("warning: no HV_INQ_TILES_LOTAR; using AVAIL\n");
+		cpu_lotar_map = *cpu_possible_mask;
+	}
+
+	/* Retrieve set of CPUs used for hash-for-home caching */
+	rc = hv_inquire_tiles(HV_INQ_TILES_HFH_CACHE,
+			      (HV_VirtAddr) hash_for_home_map.bits,
+			      sizeof(hash_for_home_map));
+	if (rc < 0)
+		early_panic("hv_inquire_tiles(HFH_CACHE) failed: rc %d\n", rc);
+	cpumask_or(&cpu_cacheable_map, cpu_possible_mask, &hash_for_home_map);
+}
+
+
+static int __init dataplane(char *str)
+{
+	pr_warn("WARNING: dataplane support disabled in this kernel\n");
+	return 0;
+}
+
+early_param("dataplane", dataplane);
+
+#ifdef CONFIG_NO_HZ_FULL
+/* Warn if hypervisor shared cpus are marked as nohz_full. */
+static int __init check_nohz_full_cpus(void)
+{
+	struct cpumask shared;
+	int cpu;
+
+	if (hv_inquire_tiles(HV_INQ_TILES_SHARED,
+			     (HV_VirtAddr) shared.bits, sizeof(shared)) < 0) {
+		pr_warn("WARNING: No support for inquiring hv shared tiles\n");
+		return 0;
+	}
+	for_each_cpu(cpu, &shared) {
+		if (tick_nohz_full_cpu(cpu))
+			pr_warn("WARNING: nohz_full cpu %d receives hypervisor interrupts!\n",
+			       cpu);
+	}
+	return 0;
+}
+arch_initcall(check_nohz_full_cpus);
+#endif
+
+#ifdef CONFIG_CMDLINE_BOOL
+static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
+#endif
+
+void __init setup_arch(char **cmdline_p)
+{
+	int len;
+
+#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
+	len = hv_get_command_line((HV_VirtAddr) boot_command_line,
+				  COMMAND_LINE_SIZE);
+	if (boot_command_line[0])
+		pr_warn("WARNING: ignoring dynamic command line \"%s\"\n",
+			boot_command_line);
+	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
+#else
+	char *hv_cmdline;
+#if defined(CONFIG_CMDLINE_BOOL)
+	if (builtin_cmdline[0]) {
+		int builtin_len = strlcpy(boot_command_line, builtin_cmdline,
+					  COMMAND_LINE_SIZE);
+		if (builtin_len < COMMAND_LINE_SIZE-1)
+			boot_command_line[builtin_len++] = ' ';
+		hv_cmdline = &boot_command_line[builtin_len];
+		len = COMMAND_LINE_SIZE - builtin_len;
+	} else
+#endif
+	{
+		hv_cmdline = boot_command_line;
+		len = COMMAND_LINE_SIZE;
+	}
+	len = hv_get_command_line((HV_VirtAddr) hv_cmdline, len);
+	if (len < 0 || len > COMMAND_LINE_SIZE)
+		early_panic("hv_get_command_line failed: %d\n", len);
+#endif
+
+	*cmdline_p = boot_command_line;
+
+	/* Set disabled_map and setup_max_cpus very early */
+	parse_early_param();
+
+	/* Make sure the kernel is compatible with the hypervisor. */
+	validate_hv();
+	validate_va();
+
+	setup_cpu_maps();
+
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+	/*
+	 * Initialize the PCI structures.  This is done before memory
+	 * setup so that we know whether or not a pci_reserve region
+	 * is necessary.
+	 */
+	if (tile_pci_init() == 0)
+		pci_reserve_mb = 0;
+
+	/* PCI systems reserve a region just below 4GB for mapping iomem. */
+	pci_reserve_end_pfn  = (1 << (32 - PAGE_SHIFT));
+	pci_reserve_start_pfn = pci_reserve_end_pfn -
+		(pci_reserve_mb << (20 - PAGE_SHIFT));
+#endif
+
+	init_mm.start_code = (unsigned long) _text;
+	init_mm.end_code = (unsigned long) _etext;
+	init_mm.end_data = (unsigned long) _edata;
+	init_mm.brk = (unsigned long) _end;
+
+	setup_memory();
+	store_permanent_mappings();
+	setup_bootmem_allocator();
+
+	/*
+	 * NOTE: before this point _nobody_ is allowed to allocate
+	 * any memory using the bootmem allocator.
+	 */
+
+#ifdef CONFIG_SWIOTLB
+	swiotlb_init(0);
+#endif
+
+	paging_init();
+	setup_numa_mapping();
+	zone_sizes_init();
+	set_page_homes();
+	setup_cpu(1);
+	setup_clock();
+	load_hv_initrd();
+}
+
+
+/*
+ * Set up per-cpu memory.
+ */
+
+unsigned long __per_cpu_offset[NR_CPUS] __write_once;
+EXPORT_SYMBOL(__per_cpu_offset);
+
+static size_t __initdata pfn_offset[MAX_NUMNODES] = { 0 };
+static unsigned long __initdata percpu_pfn[NR_CPUS] = { 0 };
+
+/*
+ * As the percpu code allocates pages, we return the pages from the
+ * end of the node for the specified cpu.
+ */
+static void *__init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
+{
+	int nid = cpu_to_node(cpu);
+	unsigned long pfn = node_percpu_pfn[nid] + pfn_offset[nid];
+
+	BUG_ON(size % PAGE_SIZE != 0);
+	pfn_offset[nid] += size / PAGE_SIZE;
+	BUG_ON(node_percpu[nid] < size);
+	node_percpu[nid] -= size;
+	if (percpu_pfn[cpu] == 0)
+		percpu_pfn[cpu] = pfn;
+	return pfn_to_kaddr(pfn);
+}
+
+/*
+ * Pages reserved for percpu memory are not freeable, and in any case we are
+ * on a short path to panic() in setup_per_cpu_area() at this point anyway.
+ */
+static void __init pcpu_fc_free(void *ptr, size_t size)
+{
+}
+
+/*
+ * Set up vmalloc page tables using bootmem for the percpu code.
+ */
+static void __init pcpu_fc_populate_pte(unsigned long addr)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+
+	BUG_ON(pgd_addr_invalid(addr));
+	if (addr < VMALLOC_START || addr >= VMALLOC_END)
+		panic("PCPU addr %#lx outside vmalloc range %#lx..%#lx; try increasing CONFIG_VMALLOC_RESERVE\n",
+		      addr, VMALLOC_START, VMALLOC_END);
+
+	pgd = swapper_pg_dir + pgd_index(addr);
+	pud = pud_offset(pgd, addr);
+	BUG_ON(!pud_present(*pud));
+	pmd = pmd_offset(pud, addr);
+	if (pmd_present(*pmd)) {
+		BUG_ON(pmd_huge_page(*pmd));
+	} else {
+		pte = __alloc_bootmem(L2_KERNEL_PGTABLE_SIZE,
+				      HV_PAGE_TABLE_ALIGN, 0);
+		pmd_populate_kernel(&init_mm, pmd, pte);
+	}
+}
+
+void __init setup_per_cpu_areas(void)
+{
+	struct page *pg;
+	unsigned long delta, pfn, lowmem_va;
+	unsigned long size = percpu_size();
+	char *ptr;
+	int rc, cpu, i;
+
+	rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, pcpu_fc_alloc,
+				   pcpu_fc_free, pcpu_fc_populate_pte);
+	if (rc < 0)
+		panic("Cannot initialize percpu area (err=%d)", rc);
+
+	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
+	for_each_possible_cpu(cpu) {
+		__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
+
+		/* finv the copy out of cache so we can change homecache */
+		ptr = pcpu_base_addr + pcpu_unit_offsets[cpu];
+		__finv_buffer(ptr, size);
+		pfn = percpu_pfn[cpu];
+
+		/* Rewrite the page tables to cache on that cpu */
+		pg = pfn_to_page(pfn);
+		for (i = 0; i < size; i += PAGE_SIZE, ++pfn, ++pg) {
+
+			/* Update the vmalloc mapping and page home. */
+			unsigned long addr = (unsigned long)ptr + i;
+			pte_t *ptep = virt_to_kpte(addr);
+			pte_t pte = *ptep;
+			BUG_ON(pfn != pte_pfn(pte));
+			pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_TILE_L3);
+			pte = set_remote_cache_cpu(pte, cpu);
+			set_pte_at(&init_mm, addr, ptep, pte);
+
+			/* Update the lowmem mapping for consistency. */
+			lowmem_va = (unsigned long)pfn_to_kaddr(pfn);
+			ptep = virt_to_kpte(lowmem_va);
+			if (pte_huge(*ptep)) {
+				printk(KERN_DEBUG "early shatter of huge page at %#lx\n",
+				       lowmem_va);
+				shatter_pmd((pmd_t *)ptep);
+				ptep = virt_to_kpte(lowmem_va);
+				BUG_ON(pte_huge(*ptep));
+			}
+			BUG_ON(pfn != pte_pfn(*ptep));
+			set_pte_at(&init_mm, lowmem_va, ptep, pte);
+		}
+	}
+
+	/* Set our thread pointer appropriately. */
+	set_my_cpu_offset(__per_cpu_offset[smp_processor_id()]);
+
+	/* Make sure the finv's have completed. */
+	mb_incoherent();
+
+	/* Flush the TLB so we reference it properly from here on out. */
+	local_flush_tlb_all();
+}
+
+static struct resource data_resource = {
+	.name	= "Kernel data",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+static struct resource code_resource = {
+	.name	= "Kernel code",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+/*
+ * On Pro, we reserve all resources above 4GB so that PCI won't try to put
+ * mappings above 4GB.
+ */
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+static struct resource* __init
+insert_non_bus_resource(void)
+{
+	struct resource *res =
+		kzalloc(sizeof(struct resource), GFP_ATOMIC);
+	if (!res)
+		return NULL;
+	res->name = "Non-Bus Physical Address Space";
+	res->start = (1ULL << 32);
+	res->end = -1LL;
+	res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
+	if (insert_resource(&iomem_resource, res)) {
+		kfree(res);
+		return NULL;
+	}
+	return res;
+}
+#endif
+
+static struct resource* __init
+insert_ram_resource(u64 start_pfn, u64 end_pfn, bool reserved)
+{
+	struct resource *res =
+		kzalloc(sizeof(struct resource), GFP_ATOMIC);
+	if (!res)
+		return NULL;
+	res->name = reserved ? "Reserved" : "System RAM";
+	res->start = start_pfn << PAGE_SHIFT;
+	res->end = (end_pfn << PAGE_SHIFT) - 1;
+	res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
+	if (insert_resource(&iomem_resource, res)) {
+		kfree(res);
+		return NULL;
+	}
+	return res;
+}
+
+/*
+ * Request address space for all standard resources
+ *
+ * If the system includes PCI root complex drivers, we need to create
+ * a window just below 4GB where PCI BARs can be mapped.
+ */
+static int __init request_standard_resources(void)
+{
+	int i;
+	enum { CODE_DELTA = MEM_SV_START - PAGE_OFFSET };
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+	insert_non_bus_resource();
+#endif
+
+	for_each_online_node(i) {
+		u64 start_pfn = node_start_pfn[i];
+		u64 end_pfn = node_end_pfn[i];
+
+#if defined(CONFIG_PCI) && !defined(__tilegx__)
+		if (start_pfn <= pci_reserve_start_pfn &&
+		    end_pfn > pci_reserve_start_pfn) {
+			if (end_pfn > pci_reserve_end_pfn)
+				insert_ram_resource(pci_reserve_end_pfn,
+						    end_pfn, 0);
+			end_pfn = pci_reserve_start_pfn;
+		}
+#endif
+		insert_ram_resource(start_pfn, end_pfn, 0);
+	}
+
+	code_resource.start = __pa(_text - CODE_DELTA);
+	code_resource.end = __pa(_etext - CODE_DELTA)-1;
+	data_resource.start = __pa(_sdata);
+	data_resource.end = __pa(_end)-1;
+
+	insert_resource(&iomem_resource, &code_resource);
+	insert_resource(&iomem_resource, &data_resource);
+
+	/* Mark any "memmap" regions busy for the resource manager. */
+	for (i = 0; i < memmap_nr; ++i) {
+		struct memmap_entry *m = &memmap_map[i];
+		insert_ram_resource(PFN_DOWN(m->addr),
+				    PFN_UP(m->addr + m->size - 1), 1);
+	}
+
+#ifdef CONFIG_KEXEC
+	insert_resource(&iomem_resource, &crashk_res);
+#endif
+
+	return 0;
+}
+
+subsys_initcall(request_standard_resources);