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acpi: add build_append_gas() helper for Generic Address Structure

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it will help to add Generic Address Structure to ACPI tables
without using packed C structures and avoid endianness
issues as API doesn't need an explicit conversion.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2018-02-28 15:23:49 +01:00 • committed by Michael S. Tsirkin
parent b8e0f58982
commit d0384d9020
2 changed files with 36 additions and 0 deletions
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16
hw/acpi/aml-build.c
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@ -258,6 +258,22 @@ static void build_append_int(GArray *table, uint64_t value)
}
}
/* Generic Address Structure (GAS)
* ACPI 2.0/3.0: 5.2.3.1 Generic Address Structure
* 2.0 compat note:
* @access_width must be 0, see ACPI 2.0:Table 5-1
*/
void build_append_gas(GArray *table, AmlAddressSpace as,
uint8_t bit_width, uint8_t bit_offset,
uint8_t access_width, uint64_t address)
{
build_append_int_noprefix(table, as, 1);
build_append_int_noprefix(table, bit_width, 1);
build_append_int_noprefix(table, bit_offset, 1);
build_append_int_noprefix(table, access_width, 1);
build_append_int_noprefix(table, address, 8);
}
/*
* Build NAME(XXXX, 0x00000000) where 0x00000000 is encoded as a dword,
* and return the offset to 0x00000000 for runtime patching.