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/*
* Copyright (c) 2023 Ian Marco Moffett and the Osmora 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 Hyra 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 <firmware/acpi/acpi.h>
#include <firmware/acpi/tables.h>
#include <vm/vm.h>
#include <string.h>
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;
}
/*
* Looks up an ACPI table with a specific
* signature e.g "APIC" for MADT (if present).
*
* @query: The specific query to make e.g "APIC"
*/
void *
acpi_query(const char *query)
{
struct acpi_header *hdr;
struct acpi_root_sdt *root_sdt;
size_t root_sdt_len, signature_len;
root_sdt = acpi_get_root_sdt();
root_sdt_len = acpi_get_root_sdt_len();
/*
* XXX: Just a reminder, sizeof() is compile time.
* There will be no actual reading,
* so this is safe.
*/
signature_len = sizeof(hdr->signature);
for (size_t i = 0; i < root_sdt_len; ++i) {
hdr = (struct acpi_header *)PHYS_TO_VIRT(root_sdt->tables[i]);
if (memcmp(hdr->signature, query, signature_len) == 0) {
return (void *)hdr;
}
}
return NULL;
}
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