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sandbox: Add un/map_sysmen() to deal with sandbox's ram_buf

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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>
This commit is contained in:
Simon Glass 2013-02-24 17:33:14 +00:00
parent e101550a9a
commit 4213fc2913
4 changed files with 32 additions and 0 deletions
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10
arch/sandbox/include/asm/io.h
View file

@ -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)
{
}