diff options
Diffstat (limited to 'hw/acpi/nvdimm.c')
| -rw-r--r-- | hw/acpi/nvdimm.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c index eb6a37b14e..df0790719a 100644 --- a/hw/acpi/nvdimm.c +++ b/hw/acpi/nvdimm.c @@ -938,6 +938,7 @@ static void nvdimm_build_common_dsm(Aml *dev) Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem, *elsectx2; Aml *elsectx, *unsupport, *unpatched, *expected_uuid, *uuid_invalid; Aml *pckg, *pckg_index, *pckg_buf, *field, *dsm_out_buf, *dsm_out_buf_size; + Aml *whilectx, *offset; uint8_t byte_list[1]; method = aml_method(NVDIMM_COMMON_DSM, 5, AML_SERIALIZED); @@ -1091,13 +1092,46 @@ static void nvdimm_build_common_dsm(Aml *dev) /* RLEN is not included in the payload returned to guest. */ aml_append(method, aml_subtract(aml_name(NVDIMM_DSM_OUT_BUF_SIZE), aml_int(4), dsm_out_buf_size)); + + /* + * As per ACPI spec 6.3, Table 19-419 Object Conversion Rules, if + * the Buffer Field <= to the size of an Integer (in bits), it will + * be treated as an integer. Moreover, the integer size depends on + * DSDT tables revision number. If revision number is < 2, integer + * size is 32 bits, otherwise it is 64 bits. + * Because of this CreateField() canot be used if RLEN < Integer Size. + * + * Also please note that APCI ASL operator SizeOf() doesn't support + * Integer and there isn't any other way to figure out the Integer + * size. Hence we assume 8 byte as Integer size and if RLEN < 8 bytes, + * build dsm_out_buf byte by byte. + */ + ifctx = aml_if(aml_lless(dsm_out_buf_size, aml_int(8))); + offset = aml_local(2); + aml_append(ifctx, aml_store(aml_int(0), offset)); + aml_append(ifctx, aml_name_decl("TBUF", aml_buffer(1, NULL))); + aml_append(ifctx, aml_store(aml_buffer(0, NULL), dsm_out_buf)); + + whilectx = aml_while(aml_lless(offset, dsm_out_buf_size)); + /* Copy 1 byte at offset from ODAT to temporary buffer(TBUF). */ + aml_append(whilectx, aml_store(aml_derefof(aml_index( + aml_name(NVDIMM_DSM_OUT_BUF), offset)), + aml_index(aml_name("TBUF"), aml_int(0)))); + aml_append(whilectx, aml_concatenate(dsm_out_buf, aml_name("TBUF"), + dsm_out_buf)); + aml_append(whilectx, aml_increment(offset)); + aml_append(ifctx, whilectx); + + aml_append(ifctx, aml_return(dsm_out_buf)); + aml_append(method, ifctx); + + /* If RLEN >= Integer size, just use CreateField() operator */ aml_append(method, aml_store(aml_shiftleft(dsm_out_buf_size, aml_int(3)), dsm_out_buf_size)); aml_append(method, aml_create_field(aml_name(NVDIMM_DSM_OUT_BUF), aml_int(0), dsm_out_buf_size, "OBUF")); - aml_append(method, aml_concatenate(aml_buffer(0, NULL), aml_name("OBUF"), - dsm_out_buf)); - aml_append(method, aml_return(dsm_out_buf)); + aml_append(method, aml_return(aml_name("OBUF"))); + aml_append(dev, method); } |