On Tue, 5 Jan 2016 02:52:05 +0800
Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> wrote:
> The dsm memory is used to save the input parameters and store
> the dsm result which is filled by QEMU.
>
> The address of dsm memory is decided by bios and patched into
> int64 object returned by "MEMA" method
>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
> ---
> hw/acpi/aml-build.c | 12 ++++++++++++
> hw/acpi/nvdimm.c | 24 ++++++++++++++++++++++--
> include/hw/acpi/aml-build.h | 1 +
> 3 files changed, 35 insertions(+), 2 deletions(-)
>
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 78e1290..83eadb3 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -394,6 +394,18 @@ Aml *aml_int(const uint64_t val)
> }
>
> /*
> + * ACPI 1.0b: 16.2.3 Data Objects Encoding:
> + * encode: QWordConst
> + */
> +Aml *aml_int64(const uint64_t val)
> +{
> + Aml *var = aml_alloc();
> + build_append_byte(var->buf, 0x0E); /* QWordPrefix */
> + build_append_int_noprefix(var->buf, val, 8);
> + return var;
> +}
> +
> +/*
> * helper to construct NameString, which returns Aml object
> * for using with aml_append or other aml_* terms
> */
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index bc7cd8f..a72104c 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -28,6 +28,7 @@
>
> #include "hw/acpi/acpi.h"
> #include "hw/acpi/aml-build.h"
> +#include "hw/acpi/bios-linker-loader.h"
> #include "hw/nvram/fw_cfg.h"
> #include "hw/mem/nvdimm.h"
>
> @@ -402,7 +403,8 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
> state->dsm_mem->len);
> }
>
> -#define NVDIMM_COMMON_DSM "NCAL"
> +#define NVDIMM_GET_DSM_MEM "MEMA"
> +#define NVDIMM_COMMON_DSM "NCAL"
>
> static void nvdimm_build_common_dsm(Aml *dev)
> {
> @@ -468,7 +470,8 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
> GArray *table_data, GArray *linker,
> uint8_t revision)
> {
> - Aml *ssdt, *sb_scope, *dev;
> + Aml *ssdt, *sb_scope, *dev, *method;
> + int offset;
>
> acpi_add_table(table_offsets, table_data);
>
> @@ -499,9 +502,26 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
>
> aml_append(sb_scope, dev);
>
> + /*
> + * leave it at the end of ssdt so that we can conveniently get the
> + * offset of int64 object returned by the function which will be
> + * patched with the real address of the dsm memory by BIOS.
> + */
> + method = aml_method(NVDIMM_GET_DSM_MEM, 0, AML_NOTSERIALIZED);
> + aml_append(method, aml_return(aml_int64(0x0)));
there is no need in dedicated aml_int64(), you can use aml_int(0x6400000000) trick
> + aml_append(sb_scope, method);
> aml_append(ssdt, sb_scope);
> /* copy AML table into ACPI tables blob and patch header there */
> g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
> +
> + offset = table_data->len - 8;
> +
> + bios_linker_loader_alloc(linker, NVDIMM_DSM_MEM_FILE, TARGET_PAGE_SIZE,
> + false /* high memory */);
> + bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
> + NVDIMM_DSM_MEM_FILE, table_data,
> + table_data->data + offset,
> + sizeof(uint64_t));
this offset magic will break badly as soon as someone add something
to the end of SSDT.
> build_header(linker, table_data,
> (void *)(table_data->data + table_data->len - ssdt->buf->len),
> "SSDT", ssdt->buf->len, revision, "NVDIMM");
> diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
> index ef44d02..b4726a4 100644
> --- a/include/hw/acpi/aml-build.h
> +++ b/include/hw/acpi/aml-build.h
> @@ -246,6 +246,7 @@ Aml *aml_name(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
> Aml *aml_name_decl(const char *name, Aml *val);
> Aml *aml_return(Aml *val);
> Aml *aml_int(const uint64_t val);
> +Aml *aml_int64(const uint64_t val);
> Aml *aml_arg(int pos);
> Aml *aml_to_integer(Aml *arg);
> Aml *aml_to_hexstring(Aml *src, Aml *dst);
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