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/*
* Copyright (c) 2025 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 <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <kern/panic.h>
#include <os/trace.h>
#include <acpi/acpi.h>
#include <acpi/tables.h>
#include <dev/clkdev/hpet.h>
#include <vm/vm.h>
#include <lib/limine.h>
#include <lib/string.h>
#define dtrace(fmt, ...) trace("acpi: " fmt, ##__VA_ARGS__)
static struct acpi_rsdp *rsdp = NULL;
static struct acpi_root_sdt *sdt;
static size_t sdt_entries = 0;
/*
* We could just search for this ourselves but as we
* boot both UEFI and BIOS, ask the loader to ensure
* we can actually obtain it
*/
static struct limine_rsdp_response *rsdp_resp;
static volatile struct limine_rsdp_request rsdp_req = {
.id = LIMINE_RSDP_REQUEST,
.revision = 0
};
/*
* Print the OEMID string found within the RSDP
*/
static void
acpi_oemid_print(struct acpi_rsdp *rsdp)
{
uint8_t rev = rsdp->revision;
/*
* Some emulators might not bother to set the revision
* in which cases it would most likely be ACPI 1.0, so
* we'll just bump that up for the sake of clarity if
* this happens.
*/
if (rev == 0) {
++rev;
}
dtrace("detected ACPI %d.0 by ", rev);
for (int i = 0; i < OEMID_SIZE; ++i) {
trace("%c", rsdp->oemid[i]);
}
trace("\n");
}
/*
* Verify the checksum of an ACPI header and return
* zero if valid
*/
static int
acpi_checksum(struct acpi_header *hdr)
{
uint8_t csum = 0;
for (int i = 0; i < hdr->length; ++i) {
csum += ((char *)hdr)[i];
}
return (csum == 0) ? 0 : -1;
}
void *
acpi_query(const char *s)
{
struct acpi_header *hdr;
for (int i = 0; i < sdt_entries; ++i) {
hdr = PHYS_TO_VIRT((uintptr_t)sdt->tables[i]);
if (memcmp(hdr->signature, s, 4) == 0) {
return acpi_checksum(hdr) == 0 ? (void *)hdr : NULL;
}
}
return NULL;
}
int
acpi_read_madt(uint32_t type, int(*cb)(struct apic_header *, size_t), size_t arg)
{
static struct acpi_madt *madt;
struct apic_header *hdr;
uint8_t *cur, *end;
int retval;
if (cb == NULL) {
return -EINVAL;
}
if (madt == NULL) {
madt = acpi_query("APIC");
}
if (madt == NULL) {
panic("acpi: could not read MADT\n");
}
cur = (uint8_t *)(madt + 1);
end = (uint8_t *)madt + madt->hdr.length;
while (cur < end) {
hdr = (void *)cur;
if (hdr->type == type) {
retval = cb(hdr, arg);
}
if (retval >= 0) {
return retval;
}
cur += hdr->length;
}
return -1;
}
void
acpi_init(void)
{
int error;
rsdp_resp = rsdp_req.response;
if (__unlikely(rsdp_resp == NULL)) {
panic("acpi: could not obtain rsdp\n");
}
rsdp = rsdp_resp->address;
acpi_oemid_print(rsdp);
/* XSDT if rev > 1.0 */
if (rsdp->revision > 1) {
sdt = PHYS_TO_VIRT(rsdp->xsdt_addr);
sdt_entries = (sdt->hdr.length - sizeof(sdt->hdr)) / 8;
dtrace("using xsdt as root sdt\n");
} else if (rsdp->revision < 2) {
sdt = PHYS_TO_VIRT(rsdp->rsdt_addr);
sdt_entries = (sdt->hdr.length - sizeof(sdt->hdr)) / 4;
dtrace("using rsdt as root sdt\n");
}
dtrace("verifying sdt integrity...\n");
if (acpi_checksum(&sdt->hdr) != 0) {
panic("acpi: bad checksum for sdt\n");
}
dtrace("OK\n");
error = hpet_init();
#if defined(__x86_64__)
if (error != 0) {
panic("acpi: require HPET on RV7/x86_64\n");
}
#endif /* __x86_64__ */
}
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