From e5083a63b6a8546c5fe1e571fe529e3939787ec2 Mon Sep 17 00:00:00 2001
From: Johannes Weiner
Date: Wed, 4 Mar 2009 16:21:31 +0100
Subject: xtensa: nommu support

Add support for !CONFIG_MMU setups.

Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
---
 arch/xtensa/mm/init.c | 62 +--------------------------------------------------
 1 file changed, 1 insertion(+), 61 deletions(-)

(limited to 'arch/xtensa/mm/init.c')

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 6190988bba17..427e14fa43c5 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -24,15 +24,8 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 
-#include <asm/pgtable.h>
 #include <asm/bootparam.h>
-#include <asm/mmu_context.h>
-#include <asm/tlb.h>
 #include <asm/page.h>
-#include <asm/pgalloc.h>
-
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 /* References to section boundaries */
 
@@ -160,7 +153,7 @@ void __init bootmem_init(void)
 }
 
 
-void __init paging_init(void)
+void __init zones_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES];
 	int i;
@@ -175,42 +168,9 @@ void __init paging_init(void)
 	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
 #endif
 
-	/* Initialize the kernel's page tables. */
-
-	memset(swapper_pg_dir, 0, PAGE_SIZE);
-
 	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
 }
 
-/*
- * Flush the mmu and reset associated register to default values.
- */
-
-void __init init_mmu (void)
-{
-	/* Writing zeros to the <t>TLBCFG special registers ensure
-	 * that valid values exist in the register.  For existing
-	 * PGSZID<w> fields, zero selects the first element of the
-	 * page-size array.  For nonexistent PGSZID<w> fields, zero is
-	 * the best value to write.  Also, when changing PGSZID<w>
-	 * fields, the corresponding TLB must be flushed.
-	 */
-	set_itlbcfg_register (0);
-	set_dtlbcfg_register (0);
-	flush_tlb_all ();
-
-	/* Set rasid register to a known value. */
-
-	set_rasid_register (ASID_USER_FIRST);
-
-	/* Set PTEVADDR special register to the start of the page
-	 * table, which is in kernel mappable space (ie. not
-	 * statically mapped).  This register's value is undefined on
-	 * reset.
-	 */
-	set_ptevaddr_register (PGTABLE_START);
-}
-
 /*
  * Initialize memory pages.
  */
@@ -281,23 +241,3 @@ void free_initmem(void)
 	printk("Freeing unused kernel memory: %dk freed\n",
 	       (&__init_end - &__init_begin) >> 10);
 }
-
-struct kmem_cache *pgtable_cache __read_mostly;
-
-static void pgd_ctor(void* addr)
-{
-	pte_t* ptep = (pte_t*)addr;
-	int i;
-
-	for (i = 0; i < 1024; i++, ptep++)
-		pte_clear(NULL, 0, ptep);
-
-}
-
-void __init pgtable_cache_init(void)
-{
-	pgtable_cache = kmem_cache_create("pgd",
-			PAGE_SIZE, PAGE_SIZE,
-			SLAB_HWCACHE_ALIGN,
-			pgd_ctor);
-}
-- 
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