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ACPICA: Add write support for DataTable operation regions 

The original implementation only supported reading from a DataTable
region. However, some machines have been seen that actually write
to the ACPI table contained in such a region. This change adds
support for writing to a DataTable region.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2010-04-01 11:09:00 +08:00 committed by Len Brown
parent 333b04ae33
commit c1637e9c64
1 changed files with 10 additions and 3 deletions
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13
drivers/acpi/acpica/exregion.c
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@ -491,8 +491,10 @@ acpi_ex_data_table_space_handler(u32 function,
{
ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
/* Perform the memory read or write */
/*
* Perform the memory read or write. The bit_width was already
* validated.
*/
switch (function) {
case ACPI_READ:
@ -502,9 +504,14 @@ acpi_ex_data_table_space_handler(u32 function,
break;
case ACPI_WRITE:
ACPI_MEMCPY(ACPI_PHYSADDR_TO_PTR(address),
ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
break;
default:
return_ACPI_STATUS(AE_SUPPORT);
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);