[SPARC]: First cut of hugetlb on sparc64, 4MB currently.

arch/sparc64/Config.help

@@ -25,6 +25,14 @@ CONFIG_SMP
 
   If you don't know what to do here, say N.
 
+CONFIG_HUGETLB_PAGE
+  This enables support for huge pages.  User space applications
+  can make use of this support with the sys_alloc_hugepages and
+  sys_free_hugepages system calls.  If your applications are
+  huge page aware, then say Y here.
+
+  Otherwise, say N.
+
 CONFIG_PREEMPT
   This option reduces the latency of the kernel when reacting to
   real-time or interactive events by allowing a low priority process to

arch/sparc64/config.in

@@ -15,6 +15,8 @@ define_bool CONFIG_VT y
 define_bool CONFIG_VT_CONSOLE y
 define_bool CONFIG_HW_CONSOLE y
 
+bool 'SPARC64 Huge TLB Page Support' CONFIG_HUGETLB_PAGE
+
 bool 'Symmetric multi-processing support' CONFIG_SMP
 bool 'Preemptible Kernel' CONFIG_PREEMPT
 

arch/sparc64/kernel/sys_sparc.c

@@ -681,3 +681,100 @@ sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long ar
 	};
 	return err;
 }
+
+#ifdef CONFIG_HUGETLB_PAGE
+#define HPAGE_ALIGN(x)  (((unsigned long)x + (HPAGE_SIZE -1)) & HPAGE_MASK)
+extern long     sys_munmap(unsigned long, size_t);
+
+/* get_addr function gets the currently unused virtual range in
+ * the current process's address space.  It returns the LARGE_PAGE_SIZE
+ * aligned address (in cases of success).  Other kernel generic
+ * routines only could gurantee that allocated address is PAGE_SIZE aligned.
+ */
+static long get_addr(unsigned long addr, unsigned long len)
+{
+	struct vm_area_struct   *vma;
+	if (addr) {
+		addr = HPAGE_ALIGN(addr);
+		vma = find_vma(current->mm, addr);
+		if (((TASK_SIZE - len) >= addr) &&
+				(!vma || addr + len <= vma->vm_start))
+			goto found_addr;
+	}
+	addr = HPAGE_ALIGN(TASK_UNMAPPED_BASE);
+	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
+		if (TASK_SIZE - len < addr)
+			return -ENOMEM;
+		if (!vma || ((addr + len) < vma->vm_start))
+			goto found_addr;
+		addr = vma->vm_end;
+	}
+found_addr:
+	addr = HPAGE_ALIGN(addr);
+	return addr;
+}
+
+extern int alloc_hugetlb_pages(int, unsigned long, unsigned long, int, int);
+
+asmlinkage long
+sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
+{
+	struct mm_struct *mm = current->mm;
+	unsigned long raddr;
+	int retval;
+
+	if (key < 0)
+		return -EINVAL;
+	if (len & (HPAGE_SIZE - 1))
+		return -EINVAL;
+	down_write(&mm->mmap_sem);
+	raddr = get_addr(addr, len);
+	retval = 0;
+	if (raddr == -ENOMEM) {
+		retval = -ENOMEM;
+		goto raddr_out;
+	}
+	retval = alloc_hugetlb_pages(key, raddr, len, prot, flag);
+
+raddr_out:
+	up_write(&mm->mmap_sem);
+	if (retval < 0)
+		return (long) retval;
+
+	return raddr;
+}
+
+extern int free_hugepages(struct vm_area_struct *);
+
+asmlinkage int
+sys_free_hugepages(unsigned long addr)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	int retval;
+
+	vma = find_vma(current->mm, addr);
+	if ((!vma) || (!is_vm_hugetlb_page(vma)) || (vma->vm_start!=addr))
+		return -EINVAL;
+	down_write(&mm->mmap_sem);
+	spin_lock(&mm->page_table_lock);
+	retval = free_hugepages(vma);
+	spin_unlock(&mm->page_table_lock);
+	up_write(&mm->mmap_sem);
+	return retval;
+}
+
+#else
+
+asmlinkage long
+sys_alloc_hugepages(int key, unsigned long addr, size_t len, int prot, int flag)
+{
+	return -ENOSYS;
+}
+asmlinkage int
+sys_free_hugepages(unsigned long addr)
+{
+	return -ENOSYS;
+}
+
+#endif

arch/sparc64/kernel/systbls.S

@@ -65,8 +65,8 @@ sys_call_table32:
 	.word sys32_ipc, sys32_sigreturn, sys_clone, sys_nis_syscall, sys32_adjtimex
 /*220*/	.word sys32_sigprocmask, sys32_create_module, sys32_delete_module, sys32_get_kernel_syms, sys_getpgid
 	.word sys32_bdflush, sys32_sysfs, sys_nis_syscall, sys32_setfsuid16, sys32_setfsgid16
-/*230*/	.word sys32_select, sys_time, sys_nis_syscall, sys_stime, sys_nis_syscall
-	.word sys_nis_syscall, sys_llseek, sys_mlock, sys_munlock, sys_mlockall
+/*230*/	.word sys32_select, sys_time, sys_nis_syscall, sys_stime, sys_alloc_hugepages
+	.word sys_free_hugepages, sys_llseek, sys_mlock, sys_munlock, sys_mlockall
 /*240*/	.word sys_munlockall, sys_sched_setparam, sys_sched_getparam, sys_sched_setscheduler, sys_sched_getscheduler
 	.word sys_sched_yield, sys_sched_get_priority_max, sys_sched_get_priority_min, sys32_sched_rr_get_interval, sys32_nanosleep
 /*250*/	.word sys32_mremap, sys32_sysctl, sys_getsid, sys_fdatasync, sys32_nfsservctl

arch/sparc64/mm/Makefile

@@ -7,4 +7,6 @@ EXTRA_AFLAGS := -ansi
 O_TARGET := mm.o
 obj-y    := ultra.o fault.o init.o generic.o extable.o modutil.o
 
+obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+
 include $(TOPDIR)/Rules.make

arch/sparc64/mm/hugetlbpage.c

+/*
+ * SPARC64 Huge TLB page support.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+
+#include <asm/mman.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+
+static struct vm_operations_struct hugetlb_vm_ops;
+struct list_head htlbpage_freelist;
+spinlock_t htlbpage_lock = SPIN_LOCK_UNLOCKED;
+extern long htlbpagemem;
+
+static void zap_hugetlb_resources(struct vm_area_struct *);
+
+#define MAX_ID 	32
+struct htlbpagekey {
+	struct inode *in;
+	int key;
+} htlbpagek[MAX_ID];
+
+static struct inode *find_key_inode(int key)
+{
+	int i;
+
+	for (i = 0; i < MAX_ID; i++) {
+		if (htlbpagek[i].key == key)
+			return htlbpagek[i].in;
+	}
+	return NULL;
+}
+
+static struct page *alloc_hugetlb_page(void)
+{
+	struct list_head *curr, *head;
+	struct page *page;
+
+	spin_lock(&htlbpage_lock);
+
+	head = &htlbpage_freelist;
+	curr = head->next;
+
+	if (curr == head) {
+		spin_unlock(&htlbpage_lock);
+		return NULL;
+	}
+	page = list_entry(curr, struct page, list);
+	list_del(curr);
+	htlbpagemem--;
+
+	spin_unlock(&htlbpage_lock);
+
+	set_page_count(page, 1);
+	memset(page_address(page), 0, HPAGE_SIZE);
+
+	return page;
+}
+
+static void free_hugetlb_page(struct page *page)
+{
+	spin_lock(&htlbpage_lock);
+	if ((page->mapping != NULL) && (page_count(page) == 2)) {
+		struct inode *inode = page->mapping->host;
+		int i;
+
+		ClearPageDirty(page);
+		remove_from_page_cache(page);
+		set_page_count(page, 1);
+		if ((inode->i_size -= HPAGE_SIZE) == 0) {
+			for (i = 0; i < MAX_ID; i++) {
+				if (htlbpagek[i].key == inode->i_ino) {
+					htlbpagek[i].key = 0;
+					htlbpagek[i].in = NULL;
+					break;
+				}
+			}
+			kfree(inode);
+		}
+	}
+	if (put_page_testzero(page)) {
+		list_add(&page->list, &htlbpage_freelist);
+		htlbpagemem++;
+	}
+	spin_unlock(&htlbpage_lock);
+}
+
+static pte_t *huge_pte_alloc_map(struct mm_struct *mm, unsigned long addr)
+{
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte = NULL;
+
+	pgd = pgd_offset(mm, addr);
+	if (pgd) {
+		pmd = pmd_alloc(mm, pgd, addr);
+		if (pmd)
+			pte = pte_alloc_map(mm, pmd, addr);
+	}
+	return pte;
+}
+
+static pte_t *huge_pte_offset_map(struct mm_struct *mm, unsigned long addr)
+{
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte = NULL;
+
+	pgd = pgd_offset(mm, addr);
+	if (pgd) {
+		pmd = pmd_offset(pgd, addr);
+		if (pmd)
+			pte = pte_offset_map(pmd, addr);
+	}
+	return pte;
+}
+
+static pte_t *huge_pte_offset_map_nested(struct mm_struct *mm, unsigned long addr)
+{
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte = NULL;
+
+	pgd = pgd_offset(mm, addr);
+	if (pgd) {
+		pmd = pmd_offset(pgd, addr);
+		if (pmd)
+			pte = pte_offset_map_nested(pmd, addr);
+	}
+	return pte;
+}
+
+#define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZ4MB; } while (0)
+
+static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
+			 struct page *page, pte_t * page_table, int write_access)
+{
+	pte_t entry;
+	unsigned long i;
+
+	mm->rss += (HPAGE_SIZE / PAGE_SIZE);
+
+	for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+		if (write_access)
+			entry = pte_mkwrite(pte_mkdirty(mk_pte(page,
+							       vma->vm_page_prot)));
+		else
+			entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
+		entry = pte_mkyoung(entry);
+		mk_pte_huge(entry);
+		pte_val(entry) += (i << PAGE_SHIFT);
+		set_pte(page_table, entry);
+		page_table++;
+	}
+}
+
+static int anon_get_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
+				 int write_access, pte_t * page_table)
+{
+	struct page *page;
+
+	page = alloc_hugetlb_page();
+	if (page == NULL)
+		return -1;
+	set_huge_pte(mm, vma, page, page_table, write_access);
+	return 1;
+}
+
+static int
+make_hugetlb_pages_present(unsigned long addr, unsigned long end, int flags)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	pte_t *pte;
+	int write;
+
+	vma = find_vma(mm, addr);
+	if (!vma)
+		goto out_error1;
+
+	write = (vma->vm_flags & VM_WRITE) != 0;
+	if ((vma->vm_end - vma->vm_start) & (HPAGE_SIZE - 1))
+		goto out_error1;
+
+	spin_lock(&mm->page_table_lock);
+	do {
+		int err;
+
+		pte = huge_pte_alloc_map(mm, addr);
+		err = (!pte ||
+		       !pte_none(*pte) ||
+		       (anon_get_hugetlb_page(mm, vma,
+					      write ? VM_WRITE : VM_READ,
+					      pte) == -1));
+		if (pte)
+			pte_unmap(pte);
+		if (err)
+			goto out_error;
+
+		addr += HPAGE_SIZE;
+	} while (addr < end);
+	spin_unlock(&mm->page_table_lock);
+
+	vma->vm_flags |= (VM_HUGETLB | VM_RESERVED);
+	if (flags & MAP_PRIVATE)
+		vma->vm_flags |= VM_DONTCOPY;
+	vma->vm_ops = &hugetlb_vm_ops;
+	return 0;
+
+out_error:
+	if (addr > vma->vm_start) {
+		vma->vm_end = addr;
+		flush_cache_range(vma, vma->vm_start, vma->vm_end);
+		zap_hugetlb_resources(vma);
+		flush_tlb_range(vma, vma->vm_start, vma->vm_end);
+		vma->vm_end = end;
+	}
+	spin_unlock(&mm->page_table_lock);
+ out_error1:
+	return -1;
+}
+
+int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
+			    struct vm_area_struct *vma)
+{
+	pte_t *src_pte, *dst_pte, entry;
+	struct page *ptepage;
+	unsigned long addr = vma->vm_start;
+	unsigned long end = vma->vm_end;
+
+	while (addr < end) {
+		unsigned long i;
+
+		dst_pte = huge_pte_alloc_map(dst, addr);
+		if (!dst_pte)
+			goto nomem;
+
+		src_pte = huge_pte_offset_map_nested(src, addr);
+		entry = *src_pte;
+		pte_unmap_nested(src_pte);
+
+		ptepage = pte_page(entry);
+		get_page(ptepage);
+		for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+			set_pte(dst_pte, entry);
+			pte_val(entry) += PAGE_SIZE;
+			dst_pte++;
+		}
+		pte_unmap(dst_pte - (1 << HUGETLB_PAGE_ORDER));
+
+		dst->rss += (HPAGE_SIZE / PAGE_SIZE);
+		addr += HPAGE_SIZE;
+	}
+	return 0;
+
+nomem:
+	return -ENOMEM;
+}
+
+int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
+			struct page **pages, struct vm_area_struct **vmas,
+			unsigned long *st, int *length, int i)
+{
+	pte_t *ptep, pte;
+	unsigned long start = *st;
+	unsigned long pstart;
+	int len = *length;
+	struct page *page;
+
+	do {
+		pstart = start;
+		ptep = huge_pte_offset_map(mm, start);
+		pte = *ptep;
+
+back1:
+		page = pte_page(pte);
+		if (pages) {
+			page += ((start & ~HPAGE_MASK) >> PAGE_SHIFT);
+			pages[i] = page;
+		}
+		if (vmas)
+			vmas[i] = vma;
+		i++;
+		len--;
+		start += PAGE_SIZE;
+		if (((start & HPAGE_MASK) == pstart) && len &&
+				(start < vma->vm_end))
+			goto back1;
+
+		pte_unmap(ptep);
+	} while (len && start < vma->vm_end);
+
+	*length = len;
+	*st = start;
+	return i;
+}
+
+static void zap_hugetlb_resources(struct vm_area_struct *mpnt)
+{
+	struct mm_struct *mm = mpnt->vm_mm;
+	unsigned long len, addr, end;
+	struct page *page;
+	pte_t *ptep;
+
+	addr = mpnt->vm_start;
+	end = mpnt->vm_end;
+	len = end - addr;
+	do {
+		unsigned long i;
+
+		ptep = huge_pte_offset_map(mm, addr);
+		page = pte_page(*ptep);
+		for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+			pte_clear(ptep);
+			ptep++;
+		}
+		pte_unmap(ptep - (1 << HUGETLB_PAGE_ORDER));
+		free_hugetlb_page(page);
+		addr += HPAGE_SIZE;
+	} while (addr < end);
+	mm->rss -= (len >> PAGE_SHIFT);
+	mpnt->vm_ops = NULL;
+}
+
+static void unlink_vma(struct vm_area_struct *mpnt)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+
+	vma = mm->mmap;
+	if (vma == mpnt) {
+		mm->mmap = vma->vm_next;
+	} else {
+		while (vma->vm_next != mpnt) {
+			vma = vma->vm_next;
+		}
+		vma->vm_next = mpnt->vm_next;
+	}
+	rb_erase(&mpnt->vm_rb, &mm->mm_rb);
+	mm->mmap_cache = NULL;
+	mm->map_count--;
+}
+
+int free_hugepages(struct vm_area_struct *mpnt)
+{
+	unlink_vma(mpnt);
+
+	flush_cache_range(mpnt, mpnt->vm_start, mpnt->vm_end);
+	zap_hugetlb_resources(mpnt);
+	flush_tlb_range(mpnt, mpnt->vm_start, mpnt->vm_end);
+
+	kmem_cache_free(vm_area_cachep, mpnt);
+	return 1;
+}
+
+static struct inode *set_new_inode(unsigned long len, int prot, int flag, int key)
+{
+	struct inode *inode;
+	int i;
+
+	for (i = 0; i < MAX_ID; i++) {
+		if (htlbpagek[i].key == 0)
+			break;
+	}
+	if (i == MAX_ID)
+		return NULL;
+	inode = kmalloc(sizeof (struct inode), GFP_KERNEL);
+	if (inode == NULL)
+		return NULL;
+
+	inode_init_once(inode);
+	atomic_inc(&inode->i_writecount);
+	inode->i_mapping = &inode->i_data;
+	inode->i_mapping->host = inode;
+	inode->i_ino = (unsigned long)key;
+
+	htlbpagek[i].key = key;
+	htlbpagek[i].in = inode;
+	inode->i_uid = current->fsuid;
+	inode->i_gid = current->fsgid;
+	inode->i_mode = prot;
+	inode->i_size = len;
+	return inode;
+}
+
+static int check_size_prot(struct inode *inode, unsigned long len, int prot, int flag)
+{
+	if (inode->i_uid != current->fsuid)
+		return -1;
+	if (inode->i_gid != current->fsgid)
+		return -1;
+	if (inode->i_size != len)
+		return -1;
+	return 0;
+}
+
+static int alloc_shared_hugetlb_pages(int key, unsigned long addr, unsigned long len,
+				      int prot, int flag)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	struct inode *inode;
+	struct address_space *mapping;
+	struct page *page;
+	int idx;
+	int retval = -ENOMEM;
+	int newalloc = 0;
+
+try_again:
+	spin_lock(&htlbpage_lock);
+
+	inode = find_key_inode(key);
+	if (inode == NULL) {
+		if (!capable(CAP_SYS_ADMIN)) {
+			if (!in_group_p(0)) {
+				retval = -EPERM;
+				goto out_err;
+			}
+		}
+		if (!(flag & IPC_CREAT)) {
+			retval = -ENOENT;
+			goto out_err;
+		}
+		inode = set_new_inode(len, prot, flag, key);
+		if (inode == NULL)
+			goto out_err;
+		newalloc = 1;
+	} else {
+		if (check_size_prot(inode, len, prot, flag) < 0) {
+			retval = -EINVAL;
+			goto out_err;
+		} else if (atomic_read(&inode->i_writecount)) {
+			spin_unlock(&htlbpage_lock);
+			goto try_again;
+		}
+	}
+	spin_unlock(&htlbpage_lock);
+	mapping = inode->i_mapping;
+
+	addr = do_mmap_pgoff(NULL, addr, len, (unsigned long) prot,
+			     MAP_NORESERVE|MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, 0);
+	if (IS_ERR((void *) addr))
+		goto freeinode;
+
+	vma = find_vma(mm, addr);
+	if (!vma) {
+		retval = -EINVAL;
+		goto freeinode;
+	}
+
+	spin_lock(&mm->page_table_lock);
+	do {
+		pte_t *pte = huge_pte_alloc_map(mm, addr);
+
+		if (!pte || !pte_none(pte)) {
+			if (pte)
+				pte_unmap(pte);
+			goto out;
+		}
+
+		idx = (addr - vma->vm_start) >> HPAGE_SHIFT;
+		page = find_get_page(mapping, idx);
+		if (page == NULL) {
+			page = alloc_hugetlb_page();
+			if (page == NULL) {
+				pte_unmap(pte);
+				goto out;
+			}
+			add_to_page_cache(page, mapping, idx);
+		}
+		set_huge_pte(mm, vma, page, pte,
+			     (vma->vm_flags & VM_WRITE));
+		pte_unmap(pte);
+
+		addr += HPAGE_SIZE;
+	} while (addr < vma->vm_end);
+
+	retval = 0;
+	vma->vm_flags |= (VM_HUGETLB | VM_RESERVED);
+	vma->vm_ops = &hugetlb_vm_ops;
+	spin_unlock(&mm->page_table_lock);
+	spin_lock(&htlbpage_lock);
+	atomic_set(&inode->i_writecount, 0);
+	spin_unlock(&htlbpage_lock);
+
+	return retval;
+
+out:
+	if (addr > vma->vm_start) {
+		unsigned long raddr;
+		raddr = vma->vm_end;
+		vma->vm_end = addr;
+
+		flush_cache_range(vma, vma->vm_start, vma->vm_end);
+		zap_hugetlb_resources(vma);
+		flush_tlb_range(vma, vma->vm_start, vma->vm_end);
+
+		vma->vm_end = raddr;
+	}
+	spin_unlock(&mm->page_table_lock);
+	do_munmap(mm, vma->vm_start, len);
+	if (newalloc)
+		goto freeinode;
+
+	return retval;
+
+out_err:
+	spin_unlock(&htlbpage_lock);
+
+freeinode:
+	if (newalloc) {
+		for (idx = 0; idx < MAX_ID; idx++) {
+			if (htlbpagek[idx].key == inode->i_ino) {
+				htlbpagek[idx].key = 0;
+				htlbpagek[idx].in = NULL;
+				break;
+			}
+		}
+		kfree(inode);
+	}
+	return retval;
+}
+
+static int alloc_private_hugetlb_pages(int key, unsigned long addr, unsigned long len,
+				       int prot, int flag)
+{
+	if (!capable(CAP_SYS_ADMIN)) {
+		if (!in_group_p(0))
+			return -EPERM;
+	}
+	addr = do_mmap_pgoff(NULL, addr, len, prot,
+			     MAP_NORESERVE|MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0);
+	if (IS_ERR((void *) addr))
+		return -ENOMEM;
+	if (make_hugetlb_pages_present(addr, (addr + len), flag) < 0) {
+		do_munmap(current->mm, addr, len);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+int alloc_hugetlb_pages(int key, unsigned long addr, unsigned long len, int prot,
+		    int flag)
+{
+	if (key > 0)
+		return alloc_shared_hugetlb_pages(key, addr, len, prot, flag);
+	return alloc_private_hugetlb_pages(key, addr, len, prot, flag);
+}
+
+extern long htlbzone_pages;
+extern struct list_head htlbpage_freelist;
+
+int set_hugetlb_mem_size(int count)
+{
+	int j, lcount;
+	struct page *page, *map;
+
+	if (count < 0)
+		lcount = count;
+	else
+		lcount = count - htlbzone_pages;
+
+	if (lcount > 0) {	/* Increase the mem size. */
+		while (lcount--) {
+			page = alloc_pages(GFP_ATOMIC, HUGETLB_PAGE_ORDER);
+			if (page == NULL)
+				break;
+			map = page;
+			for (j = 0; j < (HPAGE_SIZE / PAGE_SIZE); j++) {
+				SetPageReserved(map);
+				map++;
+			}
+			spin_lock(&htlbpage_lock);
+			list_add(&page->list, &htlbpage_freelist);
+			htlbpagemem++;
+			htlbzone_pages++;
+			spin_unlock(&htlbpage_lock);
+		}
+		return (int) htlbzone_pages;
+	}
+
+	/* Shrink the memory size. */
+	while (lcount++) {
+		page = alloc_hugetlb_page();
+		if (page == NULL)
+			break;
+
+		spin_lock(&htlbpage_lock);
+		htlbzone_pages--;
+		spin_unlock(&htlbpage_lock);
+
+		map = page;
+		for (j = 0; j < (HPAGE_SIZE / PAGE_SIZE); j++) {
+			map->flags &= ~(1UL << PG_locked | 1UL << PG_error |
+					1UL << PG_referenced |
+					1UL << PG_dirty | 1UL << PG_active |
+					1UL << PG_reserved |
+					1UL << PG_private | 1UL << PG_writeback);
+			set_page_count(page, 0);
+			map++;
+		}
+		set_page_count(page, 1);
+		__free_pages(page, HUGETLB_PAGE_ORDER);
+	}
+	return (int) htlbzone_pages;
+}
+
+static struct vm_operations_struct hugetlb_vm_ops = {
+	.close	= zap_hugetlb_resources,
+};

arch/sparc64/mm/init.c

@@ -1690,6 +1690,13 @@ static void __init taint_real_pages(void)
 	}
 }
 
+#ifdef CONFIG_HUGETLB_PAGE
+long htlbpagemem = 0;
+long htlbpage_max;
+long htlbzone_pages;
+extern struct list_head htlbpage_freelist;
+#endif
+
 void __init mem_init(void)
 {
 	unsigned long codepages, datapages, initpages;
@@ -1766,6 +1773,32 @@ void __init mem_init(void)
 
 	if (tlb_type == cheetah || tlb_type == cheetah_plus)
 		cheetah_ecache_flush_init();
+#ifdef CONFIG_HUGETLB_PAGE
+	{
+		long i, j;
+		struct page *page, *map;
+
+		/* For now reserve quarter for hugetlb_pages. */
+		htlbzone_pages = (num_physpages >> ((HPAGE_SHIFT - PAGE_SHIFT) + 2)) ;
+
+		/* Will make this kernel command line. */
+		INIT_LIST_HEAD(&htlbpage_freelist);
+		for (i = 0; i < htlbzone_pages; i++) {
+			page = alloc_pages(GFP_ATOMIC, HUGETLB_PAGE_ORDER);
+			if (page == NULL)
+				break;
+			map = page;
+			for (j = 0; j < (HPAGE_SIZE / PAGE_SIZE); j++) {
+				SetPageReserved(map);
+				map++;
+			}
+			list_add(&page->list, &htlbpage_freelist);
+		}
+		printk("Total Huge_TLB_Page memory pages allocated %ld\n", i);
+		htlbzone_pages = htlbpagemem = i;
+		htlbpage_max = i;
+	}
+#endif
 }
 
 void free_initmem (void)

include/asm-sparc/unistd.h

@@ -249,8 +249,8 @@
 #define __NR_time               231 /* Linux Specific                              */
 /* #define __NR_oldstat         232    Linux Specific                              */
 #define __NR_stime              233 /* Linux Specific                              */
-/* #define __NR_oldfstat        234    Linux Specific                              */
-/* #define __NR_phys            235    Linux Specific                              */
+#define __NR_alloc_hugepages    234 /* Linux Specific                              */
+#define __NR_free_hugepages     235 /* Linux Specific                              */
 #define __NR__llseek            236 /* Linux Specific                              */
 #define __NR_mlock              237
 #define __NR_munlock            238

include/asm-sparc64/page.h

@@ -3,6 +3,8 @@
 #ifndef _SPARC64_PAGE_H
 #define _SPARC64_PAGE_H
 
+#include <linux/config.h>
+
 #define PAGE_SHIFT   13
 #ifndef __ASSEMBLY__
 /* I have my suspicions... -DaveM */
@@ -99,6 +101,14 @@ typedef unsigned long iopgprot_t;
 
 #endif /* (STRICT_MM_TYPECHECKS) */
 
+#define HPAGE_SHIFT		22
+
+#ifdef CONFIG_HUGETLB_PAGE
+#define HPAGE_SIZE		((1UL) << HPAGE_SHIFT)
+#define HPAGE_MASK		(~(HPAGE_SIZE - 1UL))
+#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
+#endif
+
 #define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_32BIT) ? \
 				 (0x0000000070000000UL) : (PAGE_OFFSET))
 

include/asm-sparc64/unistd.h

@@ -251,8 +251,8 @@
 #endif
 /* #define __NR_oldstat         232    Linux Specific                              */
 #define __NR_stime              233 /* Linux Specific                              */
-/* #define __NR_oldfstat        234    Linux Specific                              */
-/* #define __NR_phys            235    Linux Specific                              */
+#define __NR_alloc_hugepages    234 /* Linux Specific                              */
+#define __NR_free_hugepages     235 /* Linux Specific                              */
 #define __NR__llseek            236 /* Linux Specific                              */
 #define __NR_mlock              237
 #define __NR_munlock            238