/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2022 Oxide Computer Company
 */


#include <stdio.h>
#include <unistd.h>
#include <stropts.h>
#include <strings.h>
#include <signal.h>
#include <setjmp.h>
#include <libgen.h>

#include <sys/vmm.h>
#include <sys/vmm_dev.h>
#include <sys/mman.h>
#include <vmmapi.h>

#include "common.h"

enum test_segs {
        SEG_LOWMEM = 0,
        SEG_BOOTROM = 1,
};
#define PAGE_CNT        2
#define PAGE_SZ         4096
#define SEG_SZ          (PAGE_CNT * PAGE_SZ)
#define WHOLE_SZ        (SEG_SZ * 2)

#define TESTVAL_LOWMEM  0x1000ffff
#define TESTVAL_BOOTROM 0x2000eeee

int
main(int argc, char *argv[])
{
        struct vmctx *ctx;
        int res, fd;
        const char *suite_name = basename(argv[0]);

        ctx = create_test_vm(suite_name);
        if (ctx == NULL) {
                perror("could open test VM");
                return (1);
        }
        fd = vm_get_device_fd(ctx);

        res = alloc_memseg(ctx, SEG_LOWMEM, SEG_SZ, "");
        if (res != 0) {
                perror("could not alloc lowmem seg");
                goto bail;
        }
        res = alloc_memseg(ctx, SEG_BOOTROM, SEG_SZ, "bootrom");
        if (res != 0) {
                perror("could not alloc bootrom seg");
                goto bail;
        }

        res = vm_mmap_memseg(ctx, 0, SEG_LOWMEM, 0, SEG_SZ, PROT_ALL);
        if (res != 0) {
                perror("could not map lowmem into vmspace");
                goto bail;
        }
        res = vm_mmap_memseg(ctx, SEG_SZ, SEG_BOOTROM, 0, SEG_SZ, PROT_READ);
        if (res != 0) {
                perror("could not map bootrom into vmspace");
                goto bail;
        }

        void *guest_mem;
        guest_mem = mmap(NULL, WHOLE_SZ, PROT_READ, MAP_SHARED, fd, 0);
        if (guest_mem == MAP_FAILED) {
                perror("could not mmap guest-physical memory");
                goto bail;
        }

        void *direct_lowmem, *direct_bootrom;
        off_t seg_obj_off;

        res = vm_get_devmem_offset(ctx, SEG_LOWMEM, &seg_obj_off);
        if (res != 0) {
                perror("could not find mapping offset for lowmem seg");
                goto bail;
        }
        direct_lowmem = mmap(NULL, SEG_SZ, PROT_READ | PROT_WRITE, MAP_SHARED,
            fd, seg_obj_off);
        if (direct_lowmem == MAP_FAILED) {
                perror("could not mmap lowmem directly");
                goto bail;
        }

        res = vm_get_devmem_offset(ctx, SEG_BOOTROM, &seg_obj_off);
        if (res != 0) {
                perror("could not find mapping offset for lowmem seg");
                goto bail;
        }
        direct_bootrom = mmap(NULL, SEG_SZ, PROT_READ | PROT_WRITE, MAP_SHARED,
            fd, seg_obj_off);
        if (direct_bootrom == MAP_FAILED) {
                perror("could not mmap bootrom directly");
                goto bail;
        }

        uint32_t *datap;

        datap = direct_lowmem;
        *datap = TESTVAL_LOWMEM;
        datap = direct_bootrom;
        *datap = TESTVAL_BOOTROM;

        /* check that data written though direct access is as expected */
        datap = guest_mem;
        if (*datap != TESTVAL_LOWMEM) {
                (void) fprintf(stderr, "unexpected data in lowmem %x != %x\n",
                    *datap, TESTVAL_LOWMEM);
                goto bail;
        }
        datap = (guest_mem + SEG_SZ);
        if (*datap != TESTVAL_BOOTROM) {
                (void) fprintf(stderr, "unexpected data in bootrom %x != %x\n",
                    *datap, TESTVAL_BOOTROM);
                goto bail;
        }

        /* unmap access mappings */
        res = munmap(guest_mem, WHOLE_SZ);
        if (res != 0) {
                perror("could not munmap vmspace");
                goto bail;
        }
        res = munmap(direct_lowmem, SEG_SZ);
        if (res != 0) {
                perror("could not munmap lowmem object");
                goto bail;
        }
        res = munmap(direct_bootrom, SEG_SZ);
        if (res != 0) {
                perror("could not munmap bootrom object");
                goto bail;
        }

        /* mission accomplished */
        vm_destroy(ctx);
        (void) printf("%s\tPASS\n", suite_name);
        return (0);

bail:
        vm_destroy(ctx);
        return (1);
}