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authorSimon Glass <sjg@chromium.org>2013-02-24 17:33:14 +0000
committerSimon Glass <sjg@chromium.org>2013-02-28 19:09:22 -0800
commit4213fc2913722045eb2c327a64b99e3e3178aa5c (patch)
treeaf5c64aebc9d51c61a2990db7b5b3d66afcb42a8 /arch/sandbox/include/asm
parente101550a9a8b956434cf2a73f66afbb42f4654bd (diff)
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sandbox: Add un/map_sysmen() to deal with sandbox's ram_buf
Sandbox doesn't actually provide U-Boot access to the machine's physical memory. Instead it provides a RAM buffer of configurable size, and all memory accesses are within that buffer. Sandbox memory starts at 0 and is CONFIG_DRAM_SIZE bytes in size. Allowing access outside this buffer might produce unpredictable results in the event of an error, and would expose the host machine's memory architecture to the sandbox U-Boot. Most U-Boot functions assume that they can just access memory at given address. For sandbox this is not true. Add a map_sysmem() call which converts a U-Boot address to a system address. In most cases this is a NOP, but for sandbox it returns a pointer to that memory inside the RAM buffer. To get a U-Boot feature to work correctly within sandbox, you should call map_sysmem() to get a pointer to the address, and then use that address for any U-Boot memory accesses. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/sandbox/include/asm')
-rw-r--r--arch/sandbox/include/asm/io.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 0392d218ec..d8c02364d9 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -39,3 +39,13 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
{
}
+
+/* For sandbox, we want addresses to point into our RAM buffer */
+static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
+{
+ return map_physmem(paddr, len, MAP_WRBACK);
+}
+
+static inline void unmap_sysmem(const void *vaddr)
+{
+}
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