limine/stage23/entry.s3.c

#include <lib/term.h>
#include <lib/real.h>
#include <lib/blib.h>
#include <lib/libc.h>
#include <lib/part.h>
#include <lib/config.h>
#include <lib/trace.h>
#include <sys/e820.h>
#include <sys/a20.h>
#include <lib/print.h>
#include <fs/file.h>
#include <lib/elf.h>
#include <mm/pmm.h>
#include <mm/mtrr.h>
#include <protos/stivale.h>
#include <protos/stivale2.h>
#include <protos/linux.h>
#include <protos/chainload.h>
#include <menu.h>
#include <pxe/pxe.h>
#include <pxe/tftp.h>

__attribute__((section(".stage3_build_id")))
uint64_t stage3_build_id = BUILD_ID;

__attribute__((noreturn))
__attribute__((section(".stage3_entry")))
void stage3_entry(int boot_from) {
    mtrr_save();

    switch (boot_from) {
        case BOOT_FROM_HDD:
        case BOOT_FROM_CD: {
            struct volume boot_volume;
            volume_get_by_coord(&boot_volume, boot_drive, -1);
            struct volume part = boot_volume;
            for (int i = 0; ; i++) {
                if (!init_config_disk(&part)) {
                    print("Config file found and loaded.\n");
                    boot_partition = i - 1;
                    break;
                }
                int ret = part_get(&part, &boot_volume, i);
                switch (ret) {
                    case INVALID_TABLE:
                    case END_OF_TABLE:
                        panic("Config file not found.");
                }
            }
            break;
        case BOOT_FROM_PXE:
            pxe_init();
            if (init_config_pxe()) {
                panic("Failed to load config file");
            }
            print("Config loaded via PXE\n");
            break;
        }
    }

    char *cmdline;
    char *config = menu(&cmdline);

    char *proto = config_get_value(config, 0, "PROTOCOL");
    if (proto == NULL) {
        panic("PROTOCOL not specified");
    }

    if (!strcmp(proto, "stivale")) {
        stivale_load(config, cmdline);
    } else if (!strcmp(proto, "stivale2")) {
        stivale2_load(config, cmdline, booted_from_pxe);
    } else if (!strcmp(proto, "linux")) {
        linux_load(config, cmdline);
    } else if (!strcmp(proto, "chainload")) {
        chainload(config);
    } else {
        panic("Invalid protocol specified");
    }

    for (;;);
}