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/** Copyright (C) 2026 Andromeda
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
**/
module c3os;
import acpi;
import uefi;
import uefi::guid;
import uefi::protocol::mem;
const MDESCS_LEN = 8192;
macro String version() => "0.1.0";
EfiHandle eh;
SystemTable* st;
fn EfiStatus efi_main(EfiHandle image_handle, SystemTable* system_table) @export("efi_main")
{
eh = image_handle;
st = system_table;
BootServices* bs = st.bootServices;
util::puts("welcome to c3os version ");
util::puts(version());
util::puts("\r\n");
util::puts("c3os copyright (c) 2026 andromeda <andromeda@galaxious.de>\r\n");
util::puts("This program comes with ABSOLUTELY NO WARRANTY.\r\n");
util::puts("This is free software, and you are welcome to redistribute it\r\n");
util::puts("under certain conditions; see ./LICENSE for details.\r\n");
log::info("UEFI vendor: ");
st.conOut._output_string(st.conOut, st.firmwareVendor);
util::puts(" revision ");
util::puti(st.firmwareRevision);
util::puts("\r\n");
usz mdescs_len = MDESCS_LEN;
MemoryDescriptor[MDESCS_LEN / MemoryDescriptor::size] mdescs = { };
usz mdescs_map_key = 0;
usz mdescs_descriptor_size = 0;
uint mdescs_descriptor_version = 0;
bs.get_memory_map(&mdescs_len, &mdescs, &mdescs_map_key, &mdescs_descriptor_size, &mdescs_descriptor_version);
usz acpi_index;
for (usz i = 0; i < st.numberOfTableEntries; i++)
{
if (guid::@compare(st.configurationTable[i].vendorGuid, guid::ACPI_20_TABLE))
{
acpi_index = i;
}
}
if (acpi_index == 0 || !guid::@compare(st.configurationTable[acpi_index].vendorGuid, guid::ACPI_20_TABLE))
{
log::fatal("acpi table not found");
spin();
}
RootSystemDescriptionPointer* rsdp = st.configurationTable[acpi_index].vendorTable;
if (!rsdp.is_valid())
{
log::fatal("checksum verification for root system description pointer failed\r\n");
spin();
}
ExtendedSystemDescriptionTable* xsdt = rsdp.xsdtAddress;
if (!xsdt.is_valid())
{
log::fatal("checksum verification for extended system description table failed\r\n");
spin();
}
uint num_entries = (xsdt.length - ExtendedSystemDescriptionTable::size) / ulong::size;
for (usz i = 0; i < num_entries; i++)
{
DescriptionHeader* dh = (DescriptionHeader*)(uptr)xsdt.descriptionHeaders[i];
if (dh.is_valid())
{
log::info("valid signature: ");
util::putbs(&dh.signature, 4);
util::puts("\r\n");
}
else
{
log::info("invalid signature: ");
util::putbs(&dh.signature, 4);
util::puts("\r\n");
}
}
util::puts("done\r\n");
spin();
return SUCCESS;
}
alias PanicFn = fn void(String message, String file, String function, int line);
PanicFn panicfn = &panic;
fn void panic(String message = "test", String file = "", String function = "", int line = 0)
{
util::puts("PANIC: ");
util::puts(message);
util::puts("\r\nfunc ");
util::puts(function);
util::puts(" in file ");
util::puts(file);
util::puts(" at line ");
util::puti((usz)line);
util::puts("\r\n");
spin();
}
fn void spin()
{
asm("cli");
asm("hlt");
}
module c3os::log;
import c3os::util;
fn void fatal(String s)
{
util::puts("[fatal]: ");
util::puts(s);
}
fn void info(String s)
{
util::puts("[info]: ");
util::puts(s);
}
fn void warn(String s)
{
util::puts("[warn]: ");
util::puts(s);
}
module c3os::util;
import uefi;
fn int memcmp(void* b1, void* b2, usz len) @export("memcmp") @nostrip
{
for (usz i = 0; i < len; i++)
{
if (((char*)b1)[i] < ((char*)b2)[i]) return -1;
if (((char*)b1)[i] > ((char*)b2)[i]) return 1;
}
return 0;
}
fn void* memcpy(void* dst, void* src, usz len) @export("memcpy") @nostrip
{
for (usz i = 0; i < len; i++) ((char*)dst)[i] = ((char*)src)[i];
return dst;
}
fn void* memset(void* b, int c, usz len) @export("memset") @nostrip
{
for (usz i = 0; i < len; i++)
{
((char*)b)[i] = (char)c;
}
return b;
}
fn void puts(String s) => putbs(s, s.len);
fn void putbs(char[] s, int n)
{
ushort[1024] buf = { };
for (int i = 0;; i++)
{
if (i == n || i == buf.len - 1)
{
buf[i] = '\0';
break;
}
buf[i] = s[i];
}
putw((EfiString)&buf);
}
fn void putw(EfiString w) => c3os::st.conOut._output_string(c3os::st.conOut, w);
fn void puti(usz i)
{
usz place = 1;
usz index = 0;
ushort[48] buf = { };
while (i / place > 0)
{
buf[buf.len - 2 - index] = '0' + (char)((i / place) % 10);
place *= 10;
index += 1;
}
if (i == 0)
{
buf[buf.len - 2] = '0';
index += 1;
}
buf[buf.len - 1] = '\0';
putw((EfiString)&buf[buf.len - 1 - index]);
}
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