On Mon, 20 Sep 2021 18:41:30 +0200 Eric Auger <[email protected]> wrote:
> Hi Igor, > > On 9/7/21 4:47 PM, Igor Mammedov wrote: > > it replaces error-prone pointer arithmetic for build_header() API, > > with 2 calls to start and finish table creation, > > which hides offsets magic from API user. > > > > Signed-off-by: Igor Mammedov <[email protected]> > > --- > > v3: > > * s/acpi_init_table|acpi_table_composed/acpi_table_begin|acpi_table_end/ > > > > CC: [email protected] > > --- > > hw/acpi/nvdimm.c | 18 ++++++++++-------- > > 1 file changed, 10 insertions(+), 8 deletions(-) > > > > diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c > > index 15f6ca82ca..e050b47c2b 100644 > > --- a/hw/acpi/nvdimm.c > > +++ b/hw/acpi/nvdimm.c > > @@ -1274,14 +1274,15 @@ static void nvdimm_build_ssdt(GArray > > *table_offsets, GArray *table_data, > > NVDIMMState *nvdimm_state, > > uint32_t ram_slots, const char *oem_id) > > { > > + int mem_addr_offset; > > Aml *ssdt, *sb_scope, *dev; > > - int mem_addr_offset, nvdimm_ssdt; > > + AcpiTable table = { .sig = "SSDT", .rev = 1, > > + .oem_id = oem_id, .oem_table_id = "NVDIMM" }; > > > > acpi_add_table(table_offsets, table_data); > > > > + acpi_table_begin(&table, table_data); > > ssdt = init_aml_allocator(); > > - acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader)); > > - > > sb_scope = aml_scope("\\_SB"); > > > > dev = aml_device("NVDR"); > > @@ -1310,8 +1311,6 @@ static void nvdimm_build_ssdt(GArray *table_offsets, > > GArray *table_data, > > aml_append(sb_scope, dev); > > aml_append(ssdt, sb_scope); > > > > - nvdimm_ssdt = table_data->len; > > - > > /* copy AML table into ACPI tables blob and patch header there */ > > g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len); > > mem_addr_offset = build_append_named_dword(table_data, > > @@ -1323,10 +1322,13 @@ static void nvdimm_build_ssdt(GArray > > *table_offsets, GArray *table_data, > > bios_linker_loader_add_pointer(linker, > > ACPI_BUILD_TABLE_FILE, mem_addr_offset, sizeof(uint32_t), > > NVDIMM_DSM_MEM_FILE, 0); > > - build_header(linker, table_data, > > - (void *)(table_data->data + nvdimm_ssdt), > > - "SSDT", table_data->len - nvdimm_ssdt, 1, oem_id, > > "NVDIMM"); > > free_aml_allocator(); > > + /* > > + * must be executed as the last so that pointer patching command above > > + * would be executed by guest before it recalculates checksum which > > were > > + * scheduled by acpi_table_composed() > s/acpi_table_composed/acpi_table_end. fixed it up: /* * must be executed as the last so that pointer patching command above * would be executed by guest before it recalculated checksum which were * scheduled by acpi_table_end() */ > also the sentence may need some rewording. > > Wonder if that kind of comment still is useful. Maybe this should be put > once in the doc comment of acpi_table_end() in [PATCH v3 01/35] acpi: > add helper routines to initialize ACPI tables, for future users to pay > attention that it shall be called at the very end. I'll keep comment for now, and add patch to add something similar to acpi_table_end() later or drop it if I come up with a way to actually enforce expected linker order. > Besides > > Reviewed-by: Eric Auger <[email protected]> > > Eric > > > > + */ > > + acpi_table_end(linker, &table); > > } > > > > void nvdimm_build_srat(GArray *table_data) > > >
