microblaze: Introduce fixmap

Fixmap will be used for highmem support.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 11 insertions, 6 deletions

diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index 2253e122aa85..af87fd71a83e 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -24,6 +24,7 @@
 #include <asm/pgalloc.h>
 #include <asm/sections.h>
 #include <asm/tlb.h>
+#include <asm/fixmap.h>
 
 /* Use for MMU and noMMU because of PCI generic code */
 int mem_init_done;
@@ -54,6 +55,13 @@ unsigned long lowmem_size;
 static void __init paging_init(void)
 {
         unsigned long zones_size[MAX_NR_ZONES];
+#ifdef CONFIG_MMU
+        int idx;
+
+        /* Setup fixmaps */
+        for (idx = 0; idx < __end_of_fixed_addresses; idx++)
+                clear_fixmap(idx);
+#endif
 
         /* Clean every zones */
         memset(zones_size, 0, sizeof(zones_size));
@@ -316,12 +324,9 @@ asmlinkage void __init mmu_init(void)
         /* Map in all of RAM starting at CONFIG_KERNEL_START */
         mapin_ram();
 
-#ifdef CONFIG_HIGHMEM_START_BOOL
-        ioremap_base = CONFIG_HIGHMEM_START;
-#else
-        ioremap_base = 0xfe000000UL;    /* for now, could be 0xfffff000 */
-#endif /* CONFIG_HIGHMEM_START_BOOL */
-        ioremap_bot = ioremap_base;
+        /* Extend vmalloc and ioremap area as big as possible */
+        ioremap_base = ioremap_bot = FIXADDR_START;
+
         /* Initialize the context management stuff */
         mmu_context_init();