path: root/arch/tile/kernel/setup.c

/*
 * 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/initrd.h>
#include <linux/io.h>
#include <linux/highmem.h>
#include <linux/smp.h>
#include <linux/timex.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;

struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);

/* We only create bootmem data on node 0. */
static bootmem_data_t __initdata node0_bdata;

/* Information on the NUMA nodes that we compute early */
unsigned long __cpuinitdata node_start_pfn[MAX_NUMNODES];
unsigned long __cpuinitdata 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];

#ifdef CONFIG_HIGHMEM
/* Page frame index of end of lowmem on each controller. */
unsigned long __cpuinitdata 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;

#ifdef CONFIG_PCI
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)
{
	long maxmem_mb;
	if (str == NULL || strict_strtol(str, 0, &maxmem_mb) != 0 ||
	    maxmem_mb == 0)
		return -EINVAL;

	maxmem_pfn = (maxmem_mb >> (HPAGE_SHIFT - 20)) <<
		(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;
	long maxnodemem_mb, node;

	node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;
	if (node >= MAX_NUMNODES || *endp != ':' ||
	    strict_strtol(endp+1, 0, &maxnodemem_mb) != 0)
		return -EINVAL;

	maxnodemem_pfn[node] = (maxnodemem_mb >> (HPAGE_SHIFT - 20)) <<
		(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);

static int __init setup_isolnodes(char *str)
{
	char buf[MAX_NUMNODES * 5];
	if (str == NULL || nodelist_parse(str, isolnodes) != 0)
		return -EINVAL;

	nodelist_scnprintf(buf, sizeof(buf), isolnodes);
	pr_info("Set isolnodes value to '%s'\n", buf);
	return 0;
}
early_param("isolnodes", setup_isolnodes);

#ifdef CONFIG_PCI
static int __init setup_pci_reserve(char* str)
{
	unsigned long mb;

	if (str == NULL || strict_strtoul(str, 0, &mb) != 0 ||
	    mb > 3 * 1024)
		return -EINVAL;

	pci_reserve_mb = mb;
	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_INTRPT, 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(t