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/*
* Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
* 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 VegaOS 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.
*/
/* $Id$ */
#include <firmware/acpi/acpi.h>
#include <firmware/acpi/tables.h>
#include <sys/limine.h>
#include <sys/syslog.h>
#include <sys/cdefs.h>
#include <sys/panic.h>
#include <sys/syslog.h>
#include <vm/vm.h>
__MODULE_NAME("acpi");
__KERNEL_META("$Vega$: acpi_init.c, Ian Macro Moffett, "
"ACPI init logic");
static volatile struct limine_rsdp_request rsdp_req = {
.id = LIMINE_RSDP_REQUEST,
.revision = 0
};
static size_t root_sdt_entries = 0;
static bool using_xsdt = false;
static struct acpi_root_sdt *root_sdt = NULL;
/*
* Writes out OEMID of ACPI header.
*
* @type: Type of structure (e.g RSDP)
* @hdr: Header of structure.
*/
static void
acpi_print_oemid(const char *type, char oemid[OEMID_SIZE])
{
if (type != NULL) {
KINFO("%s OEMID: ", type);
}
for (size_t i = 0; i < OEMID_SIZE; ++i) {
kprintf("%c", oemid[i]);
}
kprintf("\n");
}
static bool
acpi_is_checksum_valid(struct acpi_header *hdr)
{
uint8_t sum;
sum = 0;
for (int i = 0; i < hdr->length; ++i) {
sum += ((char *)hdr)[i];
}
/* Sum of table (from header to end) must be zero!! */
return sum == 0;
}
void
acpi_init(void)
{
struct acpi_rsdp *rsdp;
/* Can't do anything if we have no response! */
if (rsdp_req.response == NULL) {
panic("RSDP request has no response affiliated...\n");
}
/* Fetch the RSDP */
rsdp = rsdp_req.response->address;
acpi_print_oemid("RSDP", rsdp->oemid);
/* Fetch the RSDT/XSDT */
if (rsdp->revision >= 2) {
using_xsdt = true;
root_sdt = PHYS_TO_VIRT(rsdp->xsdt_addr);
KINFO("Using XSDT as root SDT\n");
} else {
root_sdt = PHYS_TO_VIRT(rsdp->rsdt_addr);
KINFO("Using RSDT as root SDT\n");
}
if (!acpi_is_checksum_valid(&root_sdt->hdr)) {
panic("Root SDT has an invalid checksum!\n");
}
root_sdt_entries = (root_sdt->hdr.length - sizeof(root_sdt->hdr)) / 4;
}
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