[S] Change in coreboot[main]: acpi/acpigen: add acpigen_write_SEG for segment group number method

[Felix Held (Code Review)]

Felix Held has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/79923?usp=email )

Change subject: acpi/acpigen: add acpigen_write_SEG for segment group number method
......................................................................

acpi/acpigen: add acpigen_write_SEG for segment group number method

Introduce acpigen_write_SEG to generate the ACPI method object that
returns the PCI segment group number for a PCI(e) host bridge.

Signed-off-by: Felix Held 
Change-Id: I94837fdbe140ee1ff904ffd20bdab3e86f850774
---
M src/acpi/acpigen.c
M src/include/acpi/acpigen.h
2 files changed, 12 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/79923/1

diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c
index 64ec734..257bd52 100644
--- a/src/acpi/acpigen.c
+++ b/src/acpi/acpigen.c
@@ -868,6 +868,17 @@
    acpigen_pop_len();
 }

+void acpigen_write_SEG(uint8_t segment_group_number)
+{
+	/*
+	 * Method (_SEG, 0, NotSerialized) { Return (status) }
+	 */
+	acpigen_write_method("_SEG", 0);
+	acpigen_emit_byte(RETURN_OP);
+	acpigen_write_byte(segment_group_number);
+	acpigen_pop_len();
+}
+
 void acpigen_write_LPI_package(u64 level, const struct acpi_lpi_state *states, u16 nentries)
 {
    /*
diff --git a/src/include/acpi/acpigen.h b/src/include/acpi/acpigen.h
index 7a5be51..d2e669f 100644
--- a/src/include/acpi/acpigen.h
+++ b/src/include/acpi/acpigen.h
@@ -436,6 +436,7 @@
 void acpigen_write_STA(uint8_t status);
 void acpigen_write_STA_ext(const char *namestring);
 void acpigen_write_BBN(uint8_t base_bus_number);
+void acpigen_write_SEG(uint8_t segment_group_number);
 void acpigen_write_TPC(const char *gnvs_tpc_limit);
 void acpigen_write_PSS_package(u32 coreFreq, u32 power, u32 transLat,
    		u32 busmLat, u32 control, u32 status);