acpi: Write pointers to tables instead of addresses
Sandbox uses an API to map between addresses and pointers. This allows
it to have (emulated) memory at zero and avoid arch-specific addressing
details. It also allows memory-mapped peripherals to work.
As an example, on many machines sandbox maps address 100 to pointer
value 10000000.
However this is not correct for ACPI, if sandbox starts another program
(e.g EFI app) and passes it the tables. That app has no knowledge of
sandbox's address mapping. So to make this work we want to store
10000000 as the value in the table.
Add two new 'nomap' functions which clearly make this exeption to how
sandbox works.
This should allow EFI apps to access ACPI tables with sandbox, e.g. for
testing purposes.
Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 3c0a102..a23bd64 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -231,5 +231,21 @@
unmap_physmem(vaddr, MAP_WRBACK);
}
+/**
+ * nomap_sysmem() - pass through an address unchanged
+ *
+ * This is used to indicate an address which should NOT be mapped, e.g. in
+ * SMBIOS tables. Using this function instead of a case shows that the sandbox
+ * conversion has been done
+ */
+static inline void *nomap_sysmem(phys_addr_t paddr, unsigned long len)
+{
+ return (void *)(uintptr_t)paddr;
+}
+
+static inline phys_addr_t nomap_to_sysmem(const void *ptr)
+{
+ return (phys_addr_t)(uintptr_t)ptr;
+}
#endif