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-rw-r--r--Documentation/arm/memory.txt4
-rw-r--r--arch/arm/mm/init.c24
2 files changed, 16 insertions, 12 deletions
diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt
index 4b1c93a..dc60455 100644
--- a/Documentation/arm/memory.txt
+++ b/Documentation/arm/memory.txt
@@ -1,7 +1,7 @@
Kernel Memory Layout on ARM Linux
Russell King <rmk@arm.linux.org.uk>
- May 21, 2004 (2.6.6)
+ November 17, 2005 (2.6.15)
This document describes the virtual memory layout which the Linux
kernel uses for ARM processors. It indicates which regions are
@@ -37,6 +37,8 @@ ff000000 ffbfffff Reserved for future expansion of DMA
mapping region.
VMALLOC_END feffffff Free for platform use, recommended.
+ VMALLOC_END must be aligned to a 2MB
+ boundary.
VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space.
Memory returned by vmalloc/ioremap will
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index c168f32..8b276ee 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -420,7 +420,8 @@ static void __init bootmem_init(struct meminfo *mi)
* Set up device the mappings. Since we clear out the page tables for all
* mappings above VMALLOC_END, we will remove any debug device mappings.
* This means you have to be careful how you debug this function, or any
- * called function. (Do it by code inspection!)
+ * called function. This means you can't use any function or debugging
+ * method which may touch any device, otherwise the kernel _will_ crash.
*/
static void __init devicemaps_init(struct machine_desc *mdesc)
{
@@ -428,6 +429,12 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
unsigned long addr;
void *vectors;
+ /*
+ * Allocate the vector page early.
+ */
+ vectors = alloc_bootmem_low_pages(PAGE_SIZE);
+ BUG_ON(!vectors);
+
for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
@@ -461,12 +468,6 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
create_mapping(&map);
#endif
- flush_cache_all();
- local_flush_tlb_all();
-
- vectors = alloc_bootmem_low_pages(PAGE_SIZE);
- BUG_ON(!vectors);
-
/*
* Create a mapping for the machine vectors at the high-vectors
* location (0xffff0000). If we aren't using high-vectors, also
@@ -491,12 +492,13 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
mdesc->map_io();
/*
- * Finally flush the tlb again - this ensures that we're in a
- * consistent state wrt the writebuffer if the writebuffer needs
- * draining. After this point, we can start to touch devices
- * again.
+ * Finally flush the caches and tlb to ensure that we're in a
+ * consistent state wrt the writebuffer. This also ensures that
+ * any write-allocated cache lines in the vector page are written
+ * back. After this point, we can start to touch devices again.
*/
local_flush_tlb_all();
+ flush_cache_all();
}
/*
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