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>

diff --git a/arch/xtensa/include/asm/cacheflush.h b/arch/xtensa/include/asm/cacheflush.h
index 94c4c53..8fc1c0c 100644 (file)
--- a/arch/xtensa/include/asm/cacheflush.h
+++ b/arch/xtensa/include/asm/cacheflush.h
@@ -65,13 +65,17 @@ extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
 # define __flush_invalidate_dcache_range(p,s)  __invalidate_dcache_range(p,s)
 #endif
 
-#if (DCACHE_WAY_SIZE > PAGE_SIZE)
+#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
 extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
+#else
+static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,
+                                                       unsigned long phys) { }
 #endif
-#if (ICACHE_WAY_SIZE > PAGE_SIZE)
+#if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE)
 extern void __invalidate_icache_page_alias(unsigned long, unsigned long);
 #else
-# define __invalidate_icache_page_alias(v,p)   do { } while(0)
+static inline void __invalidate_icache_page_alias(unsigned long virt,
+                                               unsigned long phys) { }
 #endif
 
 /*

diff --git a/arch/xtensa/include/asm/dma.h b/arch/xtensa/include/asm/dma.h
index e30f3ab..137ca39 100644 (file)
--- a/arch/xtensa/include/asm/dma.h
+++ b/arch/xtensa/include/asm/dma.h
@@ -44,8 +44,9 @@
  *     the value desired).
  */
 
+#ifndef MAX_DMA_ADDRESS
 #define MAX_DMA_ADDRESS                (PAGE_OFFSET + XCHAL_KIO_SIZE - 1)
-
+#endif
 
 /* Reserve and release a DMA channel */
 extern int request_dma(unsigned int dmanr, const char * device_id);

diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index 07b7299..d04cd3a 100644 (file)
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -69,21 +69,28 @@ static inline void * phys_to_virt(unsigned long address)
 
 static inline void *ioremap(unsigned long offset, unsigned long size)
 {
+#ifdef CONFIG_MMU
        if (offset >= XCHAL_KIO_PADDR
            && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
-
        else
                BUG();
+#else
+       return (void *)offset;
+#endif
 }
 
 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
 {
+#ifdef CONFIG_MMU
        if (offset >= XCHAL_KIO_PADDR
            && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
        else
                BUG();
+#else
+       return (void *)offset;
+#endif
 }
 
 static inline void iounmap(void *addr)

diff --git a/arch/xtensa/include/asm/mmu.h b/arch/xtensa/include/asm/mmu.h
index 44c5bb0..04890d6 100644 (file)
--- a/arch/xtensa/include/asm/mmu.h
+++ b/arch/xtensa/include/asm/mmu.h
@@ -11,7 +11,12 @@
 #ifndef _XTENSA_MMU_H
 #define _XTENSA_MMU_H
 
+#ifndef CONFIG_MMU
+#include <asm/nommu.h>
+#else
+
 /* Default "unsigned long" context */
 typedef unsigned long mm_context_t;
 
+#endif /* CONFIG_MMU */
 #endif /* _XTENSA_MMU_H */

diff --git a/arch/xtensa/include/asm/mmu_context.h b/arch/xtensa/include/asm/mmu_context.h
index 6b7c19c..dbd8731 100644 (file)
--- a/arch/xtensa/include/asm/mmu_context.h
+++ b/arch/xtensa/include/asm/mmu_context.h
@@ -13,6 +13,10 @@
 #ifndef _XTENSA_MMU_CONTEXT_H
 #define _XTENSA_MMU_CONTEXT_H
 
+#ifndef CONFIG_MMU
+#include <asm/nommu_context.h>
+#else
+
 #include <linux/stringify.h>
 #include <linux/sched.h>
 
@@ -133,4 +137,5 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 
 }
 
+#endif /* CONFIG_MMU */
 #endif /* _XTENSA_MMU_CONTEXT_H */

diff --git a/arch/xtensa/include/asm/nommu.h b/arch/xtensa/include/asm/nommu.h
new file mode 100644 (file)
index 0000000..dce2c43
--- /dev/null
+++ b/arch/xtensa/include/asm/nommu.h
@@ -0,0 +1,3 @@
+typedef struct {
+       unsigned long end_brk;
+} mm_context_t;

diff --git a/arch/xtensa/include/asm/nommu_context.h b/arch/xtensa/include/asm/nommu_context.h
new file mode 100644 (file)
index 0000000..599e7a2
--- /dev/null
+++ b/arch/xtensa/include/asm/nommu_context.h
@@ -0,0 +1,25 @@
+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
+{
+}
+
+static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+       return 0;
+}
+
+static inline void destroy_context(struct mm_struct *mm)
+{
+}
+
+static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+                               struct task_struct *tsk)
+{
+}
+
+static inline void deactivate_mm(struct task_struct *tsk, struct mm_struct *mm)
+{
+}

diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h
index a5a5d33..17e0c53 100644 (file)
--- a/arch/xtensa/include/asm/page.h
+++ b/arch/xtensa/include/asm/page.h
@@ -33,8 +33,14 @@
 #define PAGE_SIZE              (__XTENSA_UL_CONST(1) << PAGE_SHIFT)
 #define PAGE_MASK              (~(PAGE_SIZE-1))
 
+#ifdef CONFIG_MMU
 #define PAGE_OFFSET            XCHAL_KSEG_CACHED_VADDR
 #define MAX_MEM_PFN            XCHAL_KSEG_SIZE
+#else
+#define PAGE_OFFSET            0
+#define MAX_MEM_PFN            (PLATFORM_DEFAULT_MEM_START + PLATFORM_DEFAULT_MEM_SIZE)
+#endif
+
 #define PGTABLE_START          0x80000000
 
 /*
@@ -165,8 +171,9 @@ extern void copy_user_page(void*, void*, unsigned long, struct page*);
 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 #define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 
+#ifdef CONFIG_MMU
 #define WANT_PAGE_VIRTUAL
-
+#endif
 
 #endif /* __ASSEMBLY__ */
 

diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 8014d96..a138770 100644 (file)
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -183,7 +183,15 @@ extern unsigned long empty_zero_page[1024];
 
 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 
+#ifdef CONFIG_MMU
 extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
+extern void paging_init(void);
+extern void pgtable_cache_init(void);
+#else
+# define swapper_pg_dir NULL
+static inline void paging_init(void) { }
+static inline void pgtable_cache_init(void) { }
+#endif
 
 /*
  * The pmd contains the kernel virtual address of the pte page.
@@ -383,8 +391,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 
 #else
 
-extern void paging_init(void);
-
 #define kern_addr_valid(addr)  (1)
 
 extern  void update_mmu_cache(struct vm_area_struct * vma,
@@ -398,9 +404,6 @@ extern  void update_mmu_cache(struct vm_area_struct * vma,
 #define io_remap_pfn_range(vma,from,pfn,size,prot) \
                 remap_pfn_range(vma, from, pfn, size, prot)
 
-
-extern void pgtable_cache_init(void);
-
 typedef pte_t *pte_addr_t;
 
 #endif /* !defined (__ASSEMBLY__) */

diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index fba8b7e..0ea4937 100644 (file)
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -13,6 +13,7 @@
 
 #include <variant/core.h>
 #include <asm/coprocessor.h>
+#include <platform/hardware.h>
 
 #include <linux/compiler.h>
 #include <asm/ptrace.h>
@@ -35,7 +36,12 @@
  * the 1 GB requirement applies to the stack as well.
  */
 
+#ifdef CONFIG_MMU
 #define TASK_SIZE      __XTENSA_UL_CONST(0x40000000)
+#else
+#define TASK_SIZE      (PLATFORM_DEFAULT_MEM_START + PLATFORM_DEFAULT_MEM_SIZE)
+#endif
+
 #define STACK_TOP      TASK_SIZE
 #define STACK_TOP_MAX  STACK_TOP
 

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index a51d36a..80d24c4 100644 (file)
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -1463,6 +1463,7 @@ ENTRY(_spill_registers)
        callx0  a0              # should not return
 1:     j       1b
 
+#ifdef CONFIG_MMU
 /*
  * We should never get here. Bail out!
  */
@@ -1775,7 +1776,7 @@ ENTRY(fast_store_prohibited)
        bbsi.l  a2, PS_UM_BIT, 1f
        j       _kernel_exception
 1:     j       _user_exception
-
+#endif /* CONFIG_MMU */
 
 /*
  * System Calls.

diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S
index 67e6913..d092c22 100644 (file)
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -235,8 +235,9 @@ should_never_return:
  */
        
 .section ".bss.page_aligned", "w"
+#ifdef CONFIG_MMU
 ENTRY(swapper_pg_dir)
        .fill   PAGE_SIZE, 1, 0
+#endif
 ENTRY(empty_zero_page)
        .fill   PAGE_SIZE, 1, 0
-

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 4ec1633..1e5a034 100644 (file)
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -84,7 +84,13 @@ sysmem_info_t __initdata sysmem;
 int initrd_is_mapped;
 #endif
 
+#ifdef CONFIG_MMU
 extern void init_mmu(void);
+#else
+static inline void init_mmu(void) { }
+#endif
+
+extern void zones_init(void);
 
 /*
  * Boot parameter parsing.
@@ -286,6 +292,7 @@ void __init setup_arch(char **cmdline_p)
 
 
        paging_init();
+       zones_init();
 
 #ifdef CONFIG_VT
 # if defined(CONFIG_VGA_CONSOLE)

diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 6b4a9d7..9f0b711 100644 (file)
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -104,6 +104,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
 #endif
 { EXCCAUSE_UNALIGNED,          KRNL,      fast_unaligned },
 #endif
+#ifdef CONFIG_MMU
 { EXCCAUSE_ITLB_MISS,          0,         do_page_fault },
 { EXCCAUSE_ITLB_MISS,          USER|KRNL, fast_second_level_miss},
 { EXCCAUSE_ITLB_MULTIHIT,              0,         do_multihit },
@@ -118,6 +119,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
 { EXCCAUSE_STORE_CACHE_ATTRIBUTE,      USER|KRNL, fast_store_prohibited },
 { EXCCAUSE_STORE_CACHE_ATTRIBUTE,      0,         do_page_fault },
 { EXCCAUSE_LOAD_CACHE_ATTRIBUTE,       0,         do_page_fault },
+#endif /* CONFIG_MMU */
 /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */
 #if XTENSA_HAVE_COPROCESSOR(0)
 COPROCESSOR(0),

diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S
index eb2d7bb..74a7518 100644 (file)
--- a/arch/xtensa/kernel/vectors.S
+++ b/arch/xtensa/kernel/vectors.S
@@ -309,6 +309,7 @@ ENTRY(_DoubleExceptionVector)
         * All other exceptions are unexpected and thus unrecoverable!
         */
 
+#ifdef CONFIG_MMU
        .extern fast_second_level_miss_double_kernel
 
 .Lksp: /* a0: a0, a1: a1, a2: a2, a3: trashed, depc: depc, excsave: a3 */
@@ -319,6 +320,9 @@ ENTRY(_DoubleExceptionVector)
        bnez    a3, .Lunrecoverable
 1:     movi    a3, fast_second_level_miss_double_kernel
        jx      a3
+#else
+.equ   .Lksp,  .Lunrecoverable
+#endif
 
        /* Critical! We can't handle this situation. PANIC! */
 

diff --git a/arch/xtensa/mm/Makefile b/arch/xtensa/mm/Makefile
index 64e304a..f0b646d 100644 (file)
--- a/arch/xtensa/mm/Makefile
+++ b/arch/xtensa/mm/Makefile
@@ -2,4 +2,5 @@
 # Makefile for the Linux/Xtensa-specific parts of the memory manager.
 #
 
-obj-y   := init.o fault.o tlb.o misc.o cache.o
+obj-y                  := init.o cache.o misc.o
+obj-$(CONFIG_MMU)      += fault.o mmu.o tlb.o

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 6190988..427e14f 100644 (file)
--- 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);
-}

diff --git a/arch/xtensa/mm/misc.S b/arch/xtensa/mm/misc.S
index c885664..b048406 100644 (file)
--- a/arch/xtensa/mm/misc.S
+++ b/arch/xtensa/mm/misc.S
@@ -84,6 +84,7 @@ ENTRY(copy_page)
 
        retw
 
+#ifdef CONFIG_MMU
 /*
  * If we have to deal with cache aliasing, we use temporary memory mappings
  * to ensure that the source and destination pages have the same color as
@@ -311,6 +312,7 @@ ENTRY(__invalidate_icache_page_alias)
 /* End of special treatment in tlb miss exception */
 
 ENTRY(__tlbtemp_mapping_end)
+#endif /* CONFIG_MMU
 
 /*
  * void __invalidate_icache_page(ulong start)

diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c
new file mode 100644 (file)
index 0000000..4bb91a9
--- /dev/null
+++ b/arch/xtensa/mm/mmu.c
@@ -0,0 +1,70 @@
+/*
+ * xtensa mmu stuff
+ *
+ * Extracted from init.c
+ */
+#include <linux/percpu.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/cache.h>
+
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include <asm/page.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+void __init paging_init(void)
+{
+       memset(swapper_pg_dir, 0, PAGE_SIZE);
+}
+
+/*
+ * 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);
+}
+
+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);
+}