From 2d4112f76b004aa49ab8185cff4bd2313e01dff8 Mon Sep 17 00:00:00 2001 From: Felix Held Date: Thu, 4 May 2023 23:00:06 +0200 Subject: acpi/acpigen: add acpigen_write_BBN to generate base bus number method Introduce acpigen_write_BBN to generate the ACPI method object that returns the base bus number for a PCI(e) host bridge. When called, the base_bus_number argument must be the first PCI bus number that got assigned to the corresponding host bridge. Signed-off-by: Felix Held Change-Id: Ib67bf42b9c77c262d8a02d8f28ac5cb8482136b9 Reviewed-on: https://review.coreboot.org/c/coreboot/+/74991 Tested-by: build bot (Jenkins) Reviewed-by: Tim Wawrzynczak --- src/acpi/acpigen.c | 11 +++++++++++ src/include/acpi/acpigen.h | 1 + 2 files changed, 12 insertions(+) diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c index 94a6f908a9..6f6e85a571 100644 --- a/src/acpi/acpigen.c +++ b/src/acpi/acpigen.c @@ -821,6 +821,17 @@ void acpigen_write_STA_ext(const char *namestring) acpigen_pop_len(); } +void acpigen_write_BBN(uint8_t base_bus_number) +{ + /* + * Method (_BBN, 0, NotSerialized) { Return (status) } + */ + acpigen_write_method("_BBN", 0); + acpigen_emit_byte(RETURN_OP); + acpigen_write_byte(base_bus_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 fc1d01b4e3..1b60006656 100644 --- a/src/include/acpi/acpigen.h +++ b/src/include/acpi/acpigen.h @@ -435,6 +435,7 @@ void acpigen_write_PTC(uint8_t duty_width, uint8_t duty_offset, uint16_t p_cnt); void acpigen_write_PRW(u32 wake, u32 level); 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_TPC(const char *gnvs_tpc_limit); void acpigen_write_PSS_package(u32 coreFreq, u32 power, u32 transLat, u32 busmLat, u32 control, u32 status); -- cgit v1.2.3