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coreboot_tables.c: Expose the ACPI RSDP

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The ACPI RSDP can only be found in:
- legacy BIOS region
- via UEFI service

On some systems like ARM that legacy BIOS region is not an option, so
to avoid needing UEFI it makes sense to expose the RSDP via a coreboot
table entry.

This also adds the respective unit test.

Change-Id: I591312a2c48f0cbbb03b2787e4b365e9c932afff
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62573
Reviewed-by: Lance Zhao
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Arthur Heymans
2022-03-03 22:28:27 +01:00
committed by Felix Held
parent 63c6d814ce
commit 2e7e2d978b
5 changed files with 47 additions and 0 deletions
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14
src/lib/coreboot_table.c
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@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <arch/cbconfig.h>
#include <console/console.h>
#include <console/uart.h>
@ -420,6 +421,16 @@ static unsigned long lb_table_fini(struct lb_header *head)
return (unsigned long)rec + rec->size;
}
static void lb_add_acpi_rsdp(struct lb_header *head)
{
struct lb_acpi_rsdp *acpi_rsdp;
struct lb_record *rec = lb_new_record(head);
acpi_rsdp = (struct lb_acpi_rsdp *)rec;
acpi_rsdp->tag = LB_TAG_ACPI_RSDP;
acpi_rsdp->size = sizeof(*acpi_rsdp);
acpi_rsdp->rsdp_pointer = pack_lb64(get_coreboot_rsdp());
}
size_t write_coreboot_forwarding_table(uintptr_t entry, uintptr_t target)
{
struct lb_header *head;
@ -523,6 +534,9 @@ static uintptr_t write_coreboot_table(uintptr_t rom_table_end)
/* Add all cbmem entries into the coreboot tables. */
cbmem_add_records_to_cbtable(head);
if (CONFIG(HAVE_ACPI_TABLES))
lb_add_acpi_rsdp(head);
/* Remember where my valid memory ranges are */
return lb_table_fini(head);
}