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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/parisc/mm/init.c
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/parisc/mm/init.c')
-rw-r--r--arch/parisc/mm/init.c1019
1 files changed, 1019 insertions, 0 deletions
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
new file mode 100644
index 00000000000..cac37589e35
--- /dev/null
+++ b/arch/parisc/mm/init.c
@@ -0,0 +1,1019 @@
+/*
+ * linux/arch/parisc/mm/init.c
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright 1999 SuSE GmbH
+ * changed by Philipp Rumpf
+ * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
+ * Copyright 2004 Randolph Chung (tausq@debian.org)
+ *
+ */
+
+#include <linux/config.h>
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */
+#include <linux/initrd.h>
+#include <linux/swap.h>
+#include <linux/unistd.h>
+#include <linux/nodemask.h> /* for node_online_map */
+#include <linux/pagemap.h> /* for release_pages and page_cache_release */
+
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/pdc_chassis.h>
+#include <asm/mmzone.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+extern char _text; /* start of kernel code, defined by linker */
+extern int data_start;
+extern char _end; /* end of BSS, defined by linker */
+extern char __init_begin, __init_end;
+
+#ifdef CONFIG_DISCONTIGMEM
+struct node_map_data node_data[MAX_NUMNODES];
+bootmem_data_t bmem_data[MAX_NUMNODES];
+unsigned char pfnnid_map[PFNNID_MAP_MAX];
+#endif
+
+static struct resource data_resource = {
+ .name = "Kernel data",
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+};
+
+static struct resource code_resource = {
+ .name = "Kernel code",
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+};
+
+static struct resource pdcdata_resource = {
+ .name = "PDC data (Page Zero)",
+ .start = 0,
+ .end = 0x9ff,
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+};
+
+static struct resource sysram_resources[MAX_PHYSMEM_RANGES];
+
+/* The following array is initialized from the firmware specific
+ * information retrieved in kernel/inventory.c.
+ */
+
+physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES];
+int npmem_ranges;
+
+#ifdef __LP64__
+#define MAX_MEM (~0UL)
+#else /* !__LP64__ */
+#define MAX_MEM (3584U*1024U*1024U)
+#endif /* !__LP64__ */
+
+static unsigned long mem_limit = MAX_MEM;
+
+static void __init mem_limit_func(void)
+{
+ char *cp, *end;
+ unsigned long limit;
+ extern char saved_command_line[];
+
+ /* We need this before __setup() functions are called */
+
+ limit = MAX_MEM;
+ for (cp = saved_command_line; *cp; ) {
+ if (memcmp(cp, "mem=", 4) == 0) {
+ cp += 4;
+ limit = memparse(cp, &end);
+ if (end != cp)
+ break;
+ cp = end;
+ } else {
+ while (*cp != ' ' && *cp)
+ ++cp;
+ while (*cp == ' ')
+ ++cp;
+ }
+ }
+
+ if (limit < mem_limit)
+ mem_limit = limit;
+}
+
+#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
+
+static void __init setup_bootmem(void)
+{
+ unsigned long bootmap_size;
+ unsigned long mem_max;
+ unsigned long bootmap_pages;
+ unsigned long bootmap_start_pfn;
+ unsigned long bootmap_pfn;
+#ifndef CONFIG_DISCONTIGMEM
+ physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
+ int npmem_holes;
+#endif
+ int i, sysram_resource_count;
+
+ disable_sr_hashing(); /* Turn off space register hashing */
+
+ /*
+ * Sort the ranges. Since the number of ranges is typically
+ * small, and performance is not an issue here, just do
+ * a simple insertion sort.
+ */
+
+ for (i = 1; i < npmem_ranges; i++) {
+ int j;
+
+ for (j = i; j > 0; j--) {
+ unsigned long tmp;
+
+ if (pmem_ranges[j-1].start_pfn <
+ pmem_ranges[j].start_pfn) {
+
+ break;
+ }
+ tmp = pmem_ranges[j-1].start_pfn;
+ pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
+ pmem_ranges[j].start_pfn = tmp;
+ tmp = pmem_ranges[j-1].pages;
+ pmem_ranges[j-1].pages = pmem_ranges[j].pages;
+ pmem_ranges[j].pages = tmp;
+ }
+ }
+
+#ifndef CONFIG_DISCONTIGMEM
+ /*
+ * Throw out ranges that are too far apart (controlled by
+ * MAX_GAP).
+ */
+
+ for (i = 1; i < npmem_ranges; i++) {
+ if (pmem_ranges[i].start_pfn -
+ (pmem_ranges[i-1].start_pfn +
+ pmem_ranges[i-1].pages) > MAX_GAP) {
+ npmem_ranges = i;
+ printk("Large gap in memory detected (%ld pages). "
+ "Consider turning on CONFIG_DISCONTIGMEM\n",
+ pmem_ranges[i].start_pfn -
+ (pmem_ranges[i-1].start_pfn +
+ pmem_ranges[i-1].pages));
+ break;
+ }
+ }
+#endif
+
+ if (npmem_ranges > 1) {
+
+ /* Print the memory ranges */
+
+ printk(KERN_INFO "Memory Ranges:\n");
+
+ for (i = 0; i < npmem_ranges; i++) {
+ unsigned long start;
+ unsigned long size;
+
+ size = (pmem_ranges[i].pages << PAGE_SHIFT);
+ start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
+ printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
+ i,start, start + (size - 1), size >> 20);
+ }
+ }
+
+ sysram_resource_count = npmem_ranges;
+ for (i = 0; i < sysram_resource_count; i++) {
+ struct resource *res = &sysram_resources[i];
+ res->name = "System RAM";
+ res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
+ res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ request_resource(&iomem_resource, res);
+ }
+
+ /*
+ * For 32 bit kernels we limit the amount of memory we can
+ * support, in order to preserve enough kernel address space
+ * for other purposes. For 64 bit kernels we don't normally
+ * limit the memory, but this mechanism can be used to
+ * artificially limit the amount of memory (and it is written
+ * to work with multiple memory ranges).
+ */
+
+ mem_limit_func(); /* check for "mem=" argument */
+
+ mem_max = 0;
+ num_physpages = 0;
+ for (i = 0; i < npmem_ranges; i++) {
+ unsigned long rsize;
+
+ rsize = pmem_ranges[i].pages << PAGE_SHIFT;
+ if ((mem_max + rsize) > mem_limit) {
+ printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
+ if (mem_max == mem_limit)
+ npmem_ranges = i;
+ else {
+ pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
+ - (mem_max >> PAGE_SHIFT);
+ npmem_ranges = i + 1;
+ mem_max = mem_limit;
+ }
+ num_physpages += pmem_ranges[i].pages;
+ break;
+ }
+ num_physpages += pmem_ranges[i].pages;
+ mem_max += rsize;
+ }
+
+ printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
+
+#ifndef CONFIG_DISCONTIGMEM
+ /* Merge the ranges, keeping track of the holes */
+
+ {
+ unsigned long end_pfn;
+ unsigned long hole_pages;
+
+ npmem_holes = 0;
+ end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
+ for (i = 1; i < npmem_ranges; i++) {
+
+ hole_pages = pmem_ranges[i].start_pfn - end_pfn;
+ if (hole_pages) {
+ pmem_holes[npmem_holes].start_pfn = end_pfn;
+ pmem_holes[npmem_holes++].pages = hole_pages;
+ end_pfn += hole_pages;
+ }
+ end_pfn += pmem_ranges[i].pages;
+ }
+
+ pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
+ npmem_ranges = 1;
+ }
+#endif
+
+ bootmap_pages = 0;
+ for (i = 0; i < npmem_ranges; i++)
+ bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
+
+ bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
+
+#ifdef CONFIG_DISCONTIGMEM
+ for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
+ memset(NODE_DATA(i), 0, sizeof(pg_data_t));
+ NODE_DATA(i)->bdata = &bmem_data[i];
+ }
+ memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
+
+ for (i = 0; i < npmem_ranges; i++)
+ node_set_online(i);
+#endif
+
+ /*
+ * Initialize and free the full range of memory in each range.
+ * Note that the only writing these routines do are to the bootmap,
+ * and we've made sure to locate the bootmap properly so that they
+ * won't be writing over anything important.
+ */
+
+ bootmap_pfn = bootmap_start_pfn;
+ max_pfn = 0;
+ for (i = 0; i < npmem_ranges; i++) {
+ unsigned long start_pfn;
+ unsigned long npages;
+
+ start_pfn = pmem_ranges[i].start_pfn;
+ npages = pmem_ranges[i].pages;
+
+ bootmap_size = init_bootmem_node(NODE_DATA(i),
+ bootmap_pfn,
+ start_pfn,
+ (start_pfn + npages) );
+ free_bootmem_node(NODE_DATA(i),
+ (start_pfn << PAGE_SHIFT),
+ (npages << PAGE_SHIFT) );
+ bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ if ((start_pfn + npages) > max_pfn)
+ max_pfn = start_pfn + npages;
+ }
+
+ if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
+ printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
+ BUG();
+ }
+
+ /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
+
+#define PDC_CONSOLE_IO_IODC_SIZE 32768
+
+ reserve_bootmem_node(NODE_DATA(0), 0UL,
+ (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
+ reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
+ (unsigned long)(&_end - &_text));
+ reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
+ ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
+
+#ifndef CONFIG_DISCONTIGMEM
+
+ /* reserve the holes */
+
+ for (i = 0; i < npmem_holes; i++) {
+ reserve_bootmem_node(NODE_DATA(0),
+ (pmem_holes[i].start_pfn << PAGE_SHIFT),
+ (pmem_holes[i].pages << PAGE_SHIFT));
+ }
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start) {
+ printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
+ if (__pa(initrd_start) < mem_max) {
+ unsigned long initrd_reserve;
+
+ if (__pa(initrd_end) > mem_max) {
+ initrd_reserve = mem_max - __pa(initrd_start);
+ } else {
+ initrd_reserve = initrd_end - initrd_start;
+ }
+ initrd_below_start_ok = 1;
+ printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
+
+ reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
+ }
+ }
+#endif
+
+ data_resource.start = virt_to_phys(&data_start);
+ data_resource.end = virt_to_phys(&_end)-1;
+ code_resource.start = virt_to_phys(&_text);
+ code_resource.end = virt_to_phys(&data_start)-1;
+
+ /* We don't know which region the kernel will be in, so try
+ * all of them.
+ */
+ for (i = 0; i < sysram_resource_count; i++) {
+ struct resource *res = &sysram_resources[i];
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ }
+ request_resource(&sysram_resources[0], &pdcdata_resource);
+}
+
+void free_initmem(void)
+{
+ /* FIXME: */
+#if 0
+ printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",
+ (&__init_end - &__init_begin) >> 10);
+ return;
+#else
+ unsigned long addr;
+
+ printk(KERN_INFO "Freeing unused kernel memory: ");
+
+#if 1
+ /* Attempt to catch anyone trying to execute code here
+ * by filling the page with BRK insns.
+ *
+ * If we disable interrupts for all CPUs, then IPI stops working.
+ * Kinda breaks the global cache flushing.
+ */
+ local_irq_disable();
+
+ memset(&__init_begin, 0x00,
+ (unsigned long)&__init_end - (unsigned long)&__init_begin);
+
+ flush_data_cache();
+ asm volatile("sync" : : );
+ flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end);
+ asm volatile("sync" : : );
+
+ local_irq_enable();
+#endif
+
+ addr = (unsigned long)(&__init_begin);
+ for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ num_physpages++;
+ totalram_pages++;
+ }
+
+ /* set up a new led state on systems shipped LED State panel */
+ pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
+
+ printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10);
+#endif
+}
+
+/*
+ * Just an arbitrary offset to serve as a "hole" between mapping areas
+ * (between top of physical memory and a potential pcxl dma mapping
+ * area, and below the vmalloc mapping area).
+ *
+ * The current 32K value just means that there will be a 32K "hole"
+ * between mapping areas. That means that any out-of-bounds memory
+ * accesses will hopefully be caught. The vmalloc() routines leaves
+ * a hole of 4kB between each vmalloced area for the same reason.
+ */
+
+ /* Leave room for gateway page expansion */
+#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
+#error KERNEL_MAP_START is in gateway reserved region
+#endif
+#define MAP_START (KERNEL_MAP_START)
+
+#define VM_MAP_OFFSET (32*1024)
+#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
+ & ~(VM_MAP_OFFSET-1)))
+
+void *vmalloc_start;
+EXPORT_SYMBOL(vmalloc_start);
+
+#ifdef CONFIG_PA11
+unsigned long pcxl_dma_start;
+#endif
+
+void __init mem_init(void)
+{
+ high_memory = __va((max_pfn << PAGE_SHIFT));
+
+#ifndef CONFIG_DISCONTIGMEM
+ max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
+ totalram_pages += free_all_bootmem();
+#else
+ {
+ int i;
+
+ for (i = 0; i < npmem_ranges; i++)
+ totalram_pages += free_all_bootmem_node(NODE_DATA(i));
+ }
+#endif
+
+ printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
+
+#ifdef CONFIG_PA11
+ if (hppa_dma_ops == &pcxl_dma_ops) {
+ pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
+ vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
+ } else {
+ pcxl_dma_start = 0;
+ vmalloc_start = SET_MAP_OFFSET(MAP_START);
+ }
+#else
+ vmalloc_start = SET_MAP_OFFSET(MAP_START);
+#endif
+
+}
+
+int do_check_pgt_cache(int low, int high)
+{
+ return 0;
+}
+
+unsigned long *empty_zero_page;
+
+void show_mem(void)
+{
+ int i,free = 0,total = 0,reserved = 0;
+ int shared = 0, cached = 0;
+
+ printk(KERN_INFO "Mem-info:\n");
+ show_free_areas();
+ printk(KERN_INFO "Free swap: %6ldkB\n",
+ nr_swap_pages<<(PAGE_SHIFT-10));
+#ifndef CONFIG_DISCONTIGMEM
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (!page_count(&mem_map[i]))
+ free++;
+ else
+ shared += page_count(&mem_map[i]) - 1;
+ }
+#else
+ for (i = 0; i < npmem_ranges; i++) {
+ int j;
+
+ for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
+ struct page *p;
+
+ p = node_mem_map(i) + j - node_start_pfn(i);
+
+ total++;
+ if (PageReserved(p))
+ reserved++;
+ else if (PageSwapCache(p))
+ cached++;
+ else if (!page_count(p))
+ free++;
+ else
+ shared += page_count(p) - 1;
+ }
+ }
+#endif
+ printk(KERN_INFO "%d pages of RAM\n", total);
+ printk(KERN_INFO "%d reserved pages\n", reserved);
+ printk(KERN_INFO "%d pages shared\n", shared);
+ printk(KERN_INFO "%d pages swap cached\n", cached);
+
+
+#ifdef CONFIG_DISCONTIGMEM
+ {
+ struct zonelist *zl;
+ int i, j, k;
+
+ for (i = 0; i < npmem_ranges; i++) {
+ for (j = 0; j < MAX_NR_ZONES; j++) {
+ zl = NODE_DATA(i)->node_zonelists + j;
+
+ printk("Zone list for zone %d on node %d: ", j, i);
+ for (k = 0; zl->zones[k] != NULL; k++)
+ printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
+ printk("\n");
+ }
+ }
+ }
+#endif
+}
+
+
+static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
+{
+ pgd_t *pg_dir;
+ pmd_t *pmd;
+ pte_t *pg_table;
+ unsigned long end_paddr;
+ unsigned long start_pmd;
+ unsigned long start_pte;
+ unsigned long tmp1;
+ unsigned long tmp2;
+ unsigned long address;
+ unsigned long ro_start;
+ unsigned long ro_end;
+ unsigned long fv_addr;
+ unsigned long gw_addr;
+ extern const unsigned long fault_vector_20;
+ extern void * const linux_gateway_page;
+
+ ro_start = __pa((unsigned long)&_text);
+ ro_end = __pa((unsigned long)&data_start);
+ fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
+ gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
+
+ end_paddr = start_paddr + size;
+
+ pg_dir = pgd_offset_k(start_vaddr);
+
+#if PTRS_PER_PMD == 1
+ start_pmd = 0;
+#else
+ start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
+#endif
+ start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
+
+ address = start_paddr;
+ while (address < end_paddr) {
+#if PTRS_PER_PMD == 1
+ pmd = (pmd_t *)__pa(pg_dir);
+#else
+ pmd = (pmd_t *)pgd_address(*pg_dir);
+
+ /*
+ * pmd is physical at this point
+ */
+
+ if (!pmd) {
+ pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
+ pmd = (pmd_t *) __pa(pmd);
+ }
+
+ pgd_populate(NULL, pg_dir, __va(pmd));
+#endif
+ pg_dir++;
+
+ /* now change pmd to kernel virtual addresses */
+
+ pmd = (pmd_t *)__va(pmd) + start_pmd;
+ for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
+
+ /*
+ * pg_table is physical at this point
+ */
+
+ pg_table = (pte_t *)pmd_address(*pmd);
+ if (!pg_table) {
+ pg_table = (pte_t *)
+ alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
+ pg_table = (pte_t *) __pa(pg_table);
+ }
+
+ pmd_populate_kernel(NULL, pmd, __va(pg_table));
+
+ /* now change pg_table to kernel virtual addresses */
+
+ pg_table = (pte_t *) __va(pg_table) + start_pte;
+ for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
+ pte_t pte;
+
+ /*
+ * Map the fault vector writable so we can
+ * write the HPMC checksum.
+ */
+ if (address >= ro_start && address < ro_end
+ && address != fv_addr
+ && address != gw_addr)
+ pte = __mk_pte(address, PAGE_KERNEL_RO);
+ else
+ pte = __mk_pte(address, pgprot);
+
+ if (address >= end_paddr)
+ pte_val(pte) = 0;
+
+ set_pte(pg_table, pte);
+
+ address += PAGE_SIZE;
+ }
+ start_pte = 0;
+
+ if (address >= end_paddr)
+ break;
+ }
+ start_pmd = 0;
+ }
+}
+
+/*
+ * 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;
+ end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
+ size = pmem_ranges[range].pages << PAGE_SHIFT;
+
+ map_pages((unsigned long)__va(start_paddr), start_paddr,
+ size, PAGE_KERNEL);
+ }
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_end && initrd_end > mem_limit) {
+ printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
+ map_pages(initrd_start, __pa(initrd_start),
+ initrd_end - initrd_start, PAGE_KERNEL);
+ }
+#endif
+
+ empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
+ memset(empty_zero_page, 0, PAGE_SIZE);
+}
+
+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);
+}
+
+#ifdef CONFIG_HPUX
+void
+map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
+{
+ pgd_t *pg_dir;
+ pmd_t *pmd;
+ pte_t *pg_table;
+ unsigned long start_pmd;
+ unsigned long start_pte;
+ unsigned long address;
+ unsigned long hpux_gw_page_addr;
+ /* FIXME: This is 'const' in order to trick the compiler
+ into not treating it as DP-relative data. */
+ extern void * const hpux_gateway_page;
+
+ hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
+
+ /*
+ * Setup HP-UX Gateway page.
+ *
+ * The HP-UX gateway page resides in the user address space,
+ * so it needs to be aliased into each process.
+ */
+
+ pg_dir = pgd_offset(mm,hpux_gw_page_addr);
+
+#if PTRS_PER_PMD == 1
+ start_pmd = 0;
+#else
+ start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
+#endif
+ start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
+
+ address = __pa(&hpux_gateway_page);
+#if PTRS_PER_PMD == 1
+ pmd = (pmd_t *)__pa(pg_dir);
+#else
+ pmd = (pmd_t *) pgd_address(*pg_dir);
+
+ /*
+ * pmd is physical at this point
+ */
+
+ if (!pmd) {
+ pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
+ pmd = (pmd_t *) __pa(pmd);
+ }
+
+ __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
+#endif
+ /* now change pmd to kernel virtual addresses */
+
+ pmd = (pmd_t *)__va(pmd) + start_pmd;
+
+ /*
+ * pg_table is physical at this point
+ */
+
+ pg_table = (pte_t *) pmd_address(*pmd);
+ if (!pg_table)
+ pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
+
+ __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
+
+ /* now change pg_table to kernel virtual addresses */
+
+ pg_table = (pte_t *) __va(pg_table) + start_pte;
+ set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
+}
+EXPORT_SYMBOL(map_hpux_gateway_page);
+#endif
+
+extern void flush_tlb_all_local(void);
+
+void __init paging_init(void)
+{
+ int i;
+
+ setup_bootmem();
+ pagetable_init();
+ gateway_init();
+ flush_cache_all_local(); /* start with known state */
+ flush_tlb_all_local();
+
+ for (i = 0; i < npmem_ranges; i++) {
+ unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
+
+ /* We have an IOMMU, so all memory can go into a single
+ ZONE_DMA zone. */
+ zones_size[ZONE_DMA] = pmem_ranges[i].pages;
+
+#ifdef CONFIG_DISCONTIGMEM
+ /* Need to initialize the pfnnid_map before we can initialize
+ the zone */
+ {
+ int j;
+ for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
+ j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
+ j++) {
+ pfnnid_map[j] = i;
+ }
+ }
+#endif
+
+ free_area_init_node(i, NODE_DATA(i), zones_size,
+ pmem_ranges[i].start_pfn, NULL);
+ }
+}
+
+#ifdef CONFIG_PA20
+
+/*
+ * Currently, all PA20 chips have 18 bit protection id's, 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 id's and
+ * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
+ * support 15 bit protection id's, so that is the limiting factor.
+ * PCXT' has 18 bit protection id's, 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);
+ }
+ if (free_space_ids == 0)
+ BUG();
+ }
+
+ free_space_ids--;
+
+ index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
+ space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
+ 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;
+
+ dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
+ index &= (BITS_PER_LONG - 1);
+
+ spin_lock(&sid_lock);
+
+ if (*dirty_space_offset & (1L << index))
+ BUG(); /* attempt to free space id twice */
+
+ *dirty_space_offset |= (1L << index);
+ 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 = 0;
+
+void flush_tlb_all(void)
+{
+ int do_recycle;
+
+ do_recycle = 0;
+ spin_lock(&sid_lock);
+ if (dirty_space_ids > RECYCLE_THRESHOLD) {
+ if (recycle_inuse) {
+ BUG(); /* 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((void (*)(void *))flush_tlb_all_local, NULL, 1, 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)
+{
+ spin_lock(&sid_lock);
+ flush_tlb_all_local();
+ recycle_sids();
+ spin_unlock(&sid_lock);
+}
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+#if 0
+ if (start < end)
+ printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ num_physpages++;
+ totalram_pages++;
+ }
+#endif
+}
+#endif