powerpc: Minor cleanups of kernel virt address space definitions

Make FIXADDR_TOP a compile time constant and cleanup a
couple of definitions relative to the layout of the kernel
address space on ppc32. We also print out that layout at
boot time for debugging purposes.

This is a pre-requisite for properly fixing non-coherent
DMA allocactions.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 15 insertions, 8 deletions

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 666a5e8a5be1..3de6a0d93824 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -168,12 +168,8 @@ void __init MMU_init(void)
                 ppc_md.progress("MMU:mapin", 0x301);
         mapin_ram();
 
-#ifdef CONFIG_HIGHMEM
-        ioremap_base = PKMAP_BASE;
-#else
-        ioremap_base = 0xfe000000UL;    /* for now, could be 0xfffff000 */
-#endif /* CONFIG_HIGHMEM */
-        ioremap_bot = ioremap_base;
+        /* Initialize early top-down ioremap allocator */
+        ioremap_bot = IOREMAP_TOP;
 
         /* Map in I/O resources */
         if (ppc_md.progress)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index d0602a76bf7f..d3a4e67561fa 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -380,6 +380,19 @@ void __init mem_init(void)
                 bsssize >> 10,
                 initsize >> 10);
 
+#ifdef CONFIG_PPC32
+        pr_info("Kernel virtual memory layout:\n");
+        pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
+#ifdef CONFIG_HIGHMEM
+        pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
+                PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
+#endif /* CONFIG_HIGHMEM */
+        pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
+                ioremap_bot, IOREMAP_TOP);
+        pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
+                VMALLOC_START, VMALLOC_END);
+#endif /* CONFIG_PPC32 */
+
         mem_init_done = 1;
 }
 
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 430d0908fa50..5422169626ba 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -399,8 +399,6 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 #endif /* CONFIG_DEBUG_PAGEALLOC */
 
 static int fixmaps;
-unsigned long FIXADDR_TOP = (-PAGE_SIZE);
-EXPORT_SYMBOL(FIXADDR_TOP);
 
 void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
 {