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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/cdefs.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/panic.h>
#include <vm/vm.h>
#include <limine.h>
#include <string.h>
#include <stdbool.h>
#define FRAMEBUFFER framebuffer_req.response->framebuffers[0]
static off_t __hhdm_offset = 0;
static volatile struct limine_hhdm_request hhdm_req = {
.id = LIMINE_HHDM_REQUEST,
.revision = 0
};
/* Request from bootloader */
static volatile struct limine_framebuffer_request framebuffer_req = {
.id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0
};
static volatile struct limine_module_request mod_req = {
.id = LIMINE_MODULE_REQUEST,
.revision = 0
};
static volatile struct limine_rsdp_request rsdp_req = {
.id = LIMINE_RSDP_REQUEST,
.revision = 0
};
/*
* Get a module from the bootloader, this can be used for
* things like configuration or initramfs.
*
* @path: Path to lookup
* @size: Size of found data written here
*/
static char *
get_module(const char *path, uint64_t *size) {
for (uint64_t i = 0; i < mod_req.response->module_count; ++i) {
if (strcmp(mod_req.response->modules[i]->path, path) == 0) {
*size = mod_req.response->modules[i]->size;
return mod_req.response->modules[i]->address;
}
}
return NULL;
}
static void
read_fbvars(struct bootvar_fb *fbvars)
{
fbvars->io = FRAMEBUFFER->address;
fbvars->width = FRAMEBUFFER->width;
fbvars->height = FRAMEBUFFER->height;
fbvars->pitch = FRAMEBUFFER->pitch;
fbvars->bpp = FRAMEBUFFER->bpp;
}
static void
read_iovars(struct bootvar_io *iovp)
{
iovp->get_module = get_module;
}
/*
* Return the kernel base offset which is used to convert
* certain lower half physical addresses to higher half
* physical addresses.
*/
off_t
get_kernel_base(void)
{
static struct limine_hhdm_response *hhdm_resp = NULL;
if (hhdm_resp == NULL) {
if ((hhdm_resp = hhdm_req.response) == NULL) {
panic("bootvars: could not get HHDM\n");
}
}
if (__hhdm_offset == 0) {
__hhdm_offset = hhdm_resp->offset;
}
return __hhdm_offset;
}
/*
* Read bootvars given to us on boot that we will
* use to set up the system.
*
* @bvp: Bootvars result
* @flags: Optional flags (see BV_*)
*
* XXX: BV_BYPASS_CACHE calls are still cached however entries are
* guaranteed to not be stale.
*/
int
bootvars_read(struct bootvars *bvp, int flags)
{
static struct bootvars cache;
static short cached = false;
struct limine_rsdp_response *rsdp_resp;
if (bvp == NULL) {
return -EINVAL;
}
/*
* If BV_BYPASS_CACHE is not set and we have a cache
* entry, use it.
*/
if (cached && !ISSET(flags, BV_BYPASS_CACHE)) {
*bvp = cache;
return 0;
}
cache.magic = BOOTVARS_MAGIC;
read_fbvars(&cache.fbvars);
read_iovars(&cache.iovars);
/* We need this for proper operation */
if ((rsdp_resp = rsdp_req.response) == NULL) {
panic("bootvars: could not get ACPI RSDP\n");
}
cache.rsdp = rsdp_resp->address;
cached = true;
*bvp = cache;
return 0;
}
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