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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 <felix-coreboot@felixheld.de>
Change-Id: Ib67bf42b9c77c262d8a02d8f28ac5cb8482136b9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74991
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>
This commit is contained in:
Felix Held 2023-05-04 23:00:06 +02:00
parent 98bb790286
commit 2d4112f76b
2 changed files with 12 additions and 0 deletions
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11
src/acpi/acpigen.c
View File

@ -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)
{
/*

1
src/include/acpi/acpigen.h
View File

@ -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);