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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/bootvars.h>
#include <sys/panic.h>
#include <sys/syslog.h>
#include <acpi/acpi.h>
#include <acpi/tables.h>
#include <vm/vm.h>
static size_t root_sdt_len = 0;
static struct acpi_root_sdt *root_sdt = NULL;
static uintptr_t rsdp_pa = 0; /* [physical address] */
size_t
acpi_get_root_sdt_len(void)
{
return root_sdt_len;
}
void *
acpi_get_root_sdt(void)
{
return root_sdt;
}
/*
* ACPI initialization
*/
int
acpi_early_init(void)
{
struct bootvars bootvars;
struct acpi_rsdp *rsdp;
int error;
error = bootvars_read(&bootvars, 0);
if (error < 0) {
panic("acpi: failed to read bootvars\n");
}
/* Fetch the RSDP */
rsdp = bootvars.rsdp;
rsdp_pa = VIRT_TO_PHYS(rsdp);
/* Fetch the root SDT */
if (rsdp->revision >= 2) {
root_sdt = PHYS_TO_VIRT(rsdp->xsdt_addr);
printf("acpi: using XSDT as root SDT\n");
} else {
root_sdt = PHYS_TO_VIRT(rsdp->rsdt_addr);
printf("acpi: using RSDT as root SDT\n");
}
if (acpi_checksum(&root_sdt->hdr) != 0) {
panic("root SDT checksum is invalid!\n");
}
root_sdt_len = (root_sdt->hdr.length - sizeof(root_sdt->hdr)) / 4;
return 0;
}
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