/* $NetBSD: module.c,v 1.2 2022/09/21 14:30:01 riastradh Exp $ */

/*-
 * Copyright (c) 2020 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jared McNeill <jmcneill@invisible.ca>.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "efiboot.h"
#include "module.h"

#include <sys/queue.h>

int module_enabled = 1;
char module_prefix[128];

struct boot_module {
        char *module_name;
        TAILQ_ENTRY(boot_module) entries;
};
TAILQ_HEAD(, boot_module) boot_modules = TAILQ_HEAD_INITIALIZER(boot_modules);

static const char *
module_machine(void)
{
        return EFIBOOT_MODULE_MACHINE;
}

static void
module_set_prefix(const char *kernel_path)
{
#ifdef KERNEL_DIR
        char *ptr = strrchr(kernel_path, '/');
        if (ptr)
                *ptr = '\0';
        snprintf(module_prefix, sizeof(module_prefix), "%s/modules", kernel_path);
        if (ptr)
                *ptr = '/';
#else
        const u_int vmajor = netbsd_version / 100000000;
        const u_int vminor = netbsd_version / 1000000 % 100;
        const u_int vpatch = netbsd_version / 100 % 10000;

        if (vminor == 99) {
                snprintf(module_prefix, sizeof(module_prefix),
                    "/stand/%s/%u.%u.%u/modules", module_machine(),
                    vmajor, vminor, vpatch);
        } else if (vmajor != 0) {
                snprintf(module_prefix, sizeof(module_prefix),
                    "/stand/%s/%u.%u/modules", module_machine(),
                    vmajor, vminor);
        }
#endif
}

void
module_init(const char *kernel_path)
{
        module_set_prefix(kernel_path);
}

void
module_foreach(void (*fn)(const char *))
{
        struct boot_module *bm;

        TAILQ_FOREACH(bm, &boot_modules, entries) {
                fn(bm->module_name);
        }
}

void
module_add(const char *module_name)
{
        struct boot_module *bm;

        /* Trim leading whitespace */
        while (*module_name == ' ' || *module_name == '\t')
                ++module_name;

        /* Duplicate check */
        TAILQ_FOREACH(bm, &boot_modules, entries) {
                if (strcmp(bm->module_name, module_name) == 0)
                        return;
        }

        /* Add to list of modules */
        bm = alloc(sizeof(*bm));
        const int slen = strlen(module_name) + 1;
        bm->module_name = alloc(slen);
        memcpy(bm->module_name, module_name, slen);
        TAILQ_INSERT_TAIL(&boot_modules, bm, entries);
}

void
module_remove(const char *module_name)
{
        struct boot_module *bm;

        /* Trim leading whitespace */
        while (*module_name == ' ' || *module_name == '\t')
                ++module_name;

        TAILQ_FOREACH(bm, &boot_modules, entries) {
                if (strcmp(bm->module_name, module_name) == 0) {
                        TAILQ_REMOVE(&boot_modules, bm, entries);
                        dealloc(bm->module_name, strlen(bm->module_name) + 1);
                        dealloc(bm, sizeof(*bm));
                        return;
                }
        }
}

void
module_remove_all(void)
{
        struct boot_module *bm;

        while ((bm = TAILQ_FIRST(&boot_modules)) != NULL) {
                TAILQ_REMOVE(&boot_modules, bm, entries);
                dealloc(bm->module_name, strlen(bm->module_name) + 1);
                dealloc(bm, sizeof(*bm));
        }
}

void
module_enable(int onoff)
{
        module_enabled = onoff;
}