// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
 ****************************************************************************
 *
 *                   "DHRYSTONE" Benchmark Program
 *                   -----------------------------
 *
 *  Version:    C, Version 2.1
 *
 *  File:       dhry_1.c (part 2 of 3)
 *
 *  Date:       May 25, 1988
 *
 *  Author:     Reinhold P. Weicker
 *
 ****************************************************************************
 */

#include "dhry.h"

#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/string.h>

/* Global Variables: */

int Int_Glob;
char Ch_1_Glob;

static Rec_Pointer Ptr_Glob, Next_Ptr_Glob;
static Boolean Bool_Glob;
static char Ch_2_Glob;
static int Arr_1_Glob[50];
static int Arr_2_Glob[50][50];

static void Proc_3(Rec_Pointer *Ptr_Ref_Par)
/******************/
/* executed once */
/* Ptr_Ref_Par becomes Ptr_Glob */
{
        if (Ptr_Glob) {
                /* then, executed */
                *Ptr_Ref_Par = Ptr_Glob->Ptr_Comp;
        }
        Proc_7(10, Int_Glob, &Ptr_Glob->variant.var_1.Int_Comp);
} /* Proc_3 */


static void Proc_1(Rec_Pointer Ptr_Val_Par)
/******************/
/* executed once */
{
        Rec_Pointer Next_Record = Ptr_Val_Par->Ptr_Comp;
                                                /* == Ptr_Glob_Next */
        /* Local variable, initialized with Ptr_Val_Par->Ptr_Comp,    */
        /* corresponds to "rename" in Ada, "with" in Pascal           */

        *Ptr_Val_Par->Ptr_Comp = *Ptr_Glob;
        Ptr_Val_Par->variant.var_1.Int_Comp = 5;
        Next_Record->variant.var_1.Int_Comp =
                Ptr_Val_Par->variant.var_1.Int_Comp;
        Next_Record->Ptr_Comp = Ptr_Val_Par->Ptr_Comp;
        Proc_3(&Next_Record->Ptr_Comp);
        /* Ptr_Val_Par->Ptr_Comp->Ptr_Comp == Ptr_Glob->Ptr_Comp */
        if (Next_Record->Discr == Ident_1) {
                /* then, executed */
                Next_Record->variant.var_1.Int_Comp = 6;
                Proc_6(Ptr_Val_Par->variant.var_1.Enum_Comp,
                       &Next_Record->variant.var_1.Enum_Comp);
                Next_Record->Ptr_Comp = Ptr_Glob->Ptr_Comp;
                Proc_7(Next_Record->variant.var_1.Int_Comp, 10,
                       &Next_Record->variant.var_1.Int_Comp);
        } else {
                /* not executed */
                *Ptr_Val_Par = *Ptr_Val_Par->Ptr_Comp;
        }
} /* Proc_1 */


static void Proc_2(One_Fifty *Int_Par_Ref)
/******************/
/* executed once */
/* *Int_Par_Ref == 1, becomes 4 */
{
        One_Fifty  Int_Loc;
        Enumeration   Enum_Loc;

        Int_Loc = *Int_Par_Ref + 10;
        do {
                /* executed once */
                if (Ch_1_Glob == 'A') {
                        /* then, executed */
                        Int_Loc -= 1;
                        *Int_Par_Ref = Int_Loc - Int_Glob;
                        Enum_Loc = Ident_1;
                } /* if */
        } while (Enum_Loc != Ident_1); /* true */
} /* Proc_2 */


static void Proc_4(void)
/*******/
/* executed once */
{
        Boolean Bool_Loc;

        Bool_Loc = Ch_1_Glob == 'A';
        Bool_Glob = Bool_Loc | Bool_Glob;
        Ch_2_Glob = 'B';
} /* Proc_4 */


static void Proc_5(void)
/*******/
/* executed once */
{
        Ch_1_Glob = 'A';
        Bool_Glob = false;
} /* Proc_5 */


int dhry(int n)
/*****/

  /* main program, corresponds to procedures        */
  /* Main and Proc_0 in the Ada version             */
{
        One_Fifty Int_1_Loc;
        One_Fifty Int_2_Loc;
        One_Fifty Int_3_Loc;
        char Ch_Index;
        Enumeration Enum_Loc;
        Str_30 Str_1_Loc;
        Str_30 Str_2_Loc;
        int Run_Index;
        int Number_Of_Runs;
        ktime_t Begin_Time, End_Time;
        u32 User_Time;

        /* Initializations */

        Next_Ptr_Glob = (Rec_Pointer) kzalloc_obj(Rec_Type, GFP_ATOMIC);
        if (!Next_Ptr_Glob)
                return -ENOMEM;

        Ptr_Glob = (Rec_Pointer) kzalloc_obj(Rec_Type, GFP_ATOMIC);
        if (!Ptr_Glob) {
                kfree(Next_Ptr_Glob);
                return -ENOMEM;
        }

        Ptr_Glob->Ptr_Comp = Next_Ptr_Glob;
        Ptr_Glob->Discr = Ident_1;
        Ptr_Glob->variant.var_1.Enum_Comp = Ident_3;
        Ptr_Glob->variant.var_1.Int_Comp = 40;
        strcpy(Ptr_Glob->variant.var_1.Str_Comp,
               "DHRYSTONE PROGRAM, SOME STRING");
        strcpy(Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");

        Arr_2_Glob[8][7] = 10;
        /* Was missing in published program. Without this statement,    */
        /* Arr_2_Glob[8][7] would have an undefined value.             */
        /* Warning: With 16-Bit processors and Number_Of_Runs > 32000,  */
        /* overflow may occur for this array element.                   */

        pr_debug("Dhrystone Benchmark, Version 2.1 (Language: C)\n");

        Number_Of_Runs = n;

        pr_debug("Execution starts, %d runs through Dhrystone\n",
                 Number_Of_Runs);

        /***************/
        /* Start timer */
        /***************/

        Begin_Time = ktime_get();

        for (Run_Index = 1; Run_Index <= Number_Of_Runs; ++Run_Index) {
                Proc_5();
                Proc_4();
                /* Ch_1_Glob == 'A', Ch_2_Glob == 'B', Bool_Glob == true */
                Int_1_Loc = 2;
                Int_2_Loc = 3;
                strcpy(Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
                Enum_Loc = Ident_2;
                Bool_Glob = !Func_2(Str_1_Loc, Str_2_Loc);
                /* Bool_Glob == 1 */
                while (Int_1_Loc < Int_2_Loc) {
                        /* loop body executed once */
                        Int_3_Loc = 5 * Int_1_Loc - Int_2_Loc;
                        /* Int_3_Loc == 7 */
                        Proc_7(Int_1_Loc, Int_2_Loc, &Int_3_Loc);
                        /* Int_3_Loc == 7 */
                        Int_1_Loc += 1;
                } /* while */
                /* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
                Proc_8(Arr_1_Glob, Arr_2_Glob, Int_1_Loc, Int_3_Loc);
                /* Int_Glob == 5 */
                Proc_1(Ptr_Glob);
                for (Ch_Index = 'A'; Ch_Index <= Ch_2_Glob; ++Ch_Index) {
                        /* loop body executed twice */
                        if (Enum_Loc == Func_1(Ch_Index, 'C')) {
                                /* then, not executed */
                                Proc_6(Ident_1, &Enum_Loc);
                                strcpy(Str_2_Loc, "DHRYSTONE PROGRAM, 3'RD STRING");
                                Int_2_Loc = Run_Index;
                                Int_Glob = Run_Index;
                        }
                }
                /* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
                Int_2_Loc = Int_2_Loc * Int_1_Loc;
                Int_1_Loc = Int_2_Loc / Int_3_Loc;
                Int_2_Loc = 7 * (Int_2_Loc - Int_3_Loc) - Int_1_Loc;
                /* Int_1_Loc == 1, Int_2_Loc == 13, Int_3_Loc == 7 */
                Proc_2(&Int_1_Loc);
                /* Int_1_Loc == 5 */

        } /* loop "for Run_Index" */

        /**************/
        /* Stop timer */
        /**************/

        End_Time = ktime_get();

#define dhry_assert_int_eq(val, expected)                               \
        if (val != expected)                                            \
                pr_err("%s: %d (FAIL, expected %d)\n", #val, val,       \
                       expected);                                       \
        else                                                            \
                pr_debug("%s: %d (OK)\n", #val, val)

#define dhry_assert_char_eq(val, expected)                              \
        if (val != expected)                                            \
                pr_err("%s: %c (FAIL, expected %c)\n", #val, val,       \
                       expected);                                       \
        else                                                            \
                pr_debug("%s: %c (OK)\n", #val, val)

#define dhry_assert_string_eq(val, expected)                            \
        if (strcmp(val, expected))                                      \
                pr_err("%s: %s (FAIL, expected %s)\n", #val, val,       \
                       expected);                                       \
        else                                                            \
                pr_debug("%s: %s (OK)\n", #val, val)

        pr_debug("Execution ends\n");
        pr_debug("Final values of the variables used in the benchmark:\n");
        dhry_assert_int_eq(Int_Glob, 5);
        dhry_assert_int_eq(Bool_Glob, 1);
        dhry_assert_char_eq(Ch_1_Glob, 'A');
        dhry_assert_char_eq(Ch_2_Glob, 'B');
        dhry_assert_int_eq(Arr_1_Glob[8], 7);
        dhry_assert_int_eq(Arr_2_Glob[8][7], Number_Of_Runs + 10);
        pr_debug("Ptr_Comp: %px\n", Ptr_Glob->Ptr_Comp);
        dhry_assert_int_eq(Ptr_Glob->Discr, 0);
        dhry_assert_int_eq(Ptr_Glob->variant.var_1.Enum_Comp, 2);
        dhry_assert_int_eq(Ptr_Glob->variant.var_1.Int_Comp, 17);
        dhry_assert_string_eq(Ptr_Glob->variant.var_1.Str_Comp,
                              "DHRYSTONE PROGRAM, SOME STRING");
        if (Next_Ptr_Glob->Ptr_Comp != Ptr_Glob->Ptr_Comp)
                pr_err("Next_Ptr_Glob->Ptr_Comp: %px (expected %px)\n",
                       Next_Ptr_Glob->Ptr_Comp, Ptr_Glob->Ptr_Comp);
        else
                pr_debug("Next_Ptr_Glob->Ptr_Comp: %px\n",
                         Next_Ptr_Glob->Ptr_Comp);
        dhry_assert_int_eq(Next_Ptr_Glob->Discr, 0);
        dhry_assert_int_eq(Next_Ptr_Glob->variant.var_1.Enum_Comp, 1);
        dhry_assert_int_eq(Next_Ptr_Glob->variant.var_1.Int_Comp, 18);
        dhry_assert_string_eq(Next_Ptr_Glob->variant.var_1.Str_Comp,
                              "DHRYSTONE PROGRAM, SOME STRING");
        dhry_assert_int_eq(Int_1_Loc, 5);
        dhry_assert_int_eq(Int_2_Loc, 13);
        dhry_assert_int_eq(Int_3_Loc, 7);
        dhry_assert_int_eq(Enum_Loc, 1);
        dhry_assert_string_eq(Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");
        dhry_assert_string_eq(Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");

        User_Time = ktime_ms_delta(End_Time, Begin_Time);

        kfree(Ptr_Glob);
        kfree(Next_Ptr_Glob);

        /* Measurements should last at least 2 seconds */
        if (User_Time < 2 * MSEC_PER_SEC)
                return -EAGAIN;

        return div_u64(mul_u32_u32(MSEC_PER_SEC, Number_Of_Runs), User_Time);
}