Subversion Repositories openrisc_2011-10-31

//////////////////////////////////////////////////////////////////////
////                                                              ////
////                                                              ////
//// OR1200 MMU test                                              ////
////                                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source 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 Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
 
// Tests most functions of the MMUs.
// The tests attempt to keep the areas of instruction and data memory working 
// as they should, while testing around them, higher in memory. Some linker 
// variables are relied upon by the interrupt routines for checking if areas 
// are within the expected text areas of memory, but usually we just keep 
// above the stack (also set in the linker script) and things go OK.
 
// The tests for translation setup address translation in the MMU from areas 
// in the 512kB - 1024kB region (64 sets in OR1200, 8kByte per set) to halfway
// through RAM. Usually the sets taht would encompass the actual program are 
// skipped (TLB_TEXT_SET_NB) ie, we say how many sets encompass the program 
// text for itlb tests and only do tests above it (so, on sets 8-64, meaning 
// when we enable the iMMU and say have the execution bits disabled to force a
// page fault the program gets to continue and is translated 1-1 while 
// accesses to the areas we are testing will cause a page fault) but it should
//  still work to test all sets.
 
// In essense, the tests are aware that they could be operating out of the 
// same memory the tests are being performed in and takes care of this.
 
// The use of the "match_space" variable is for the addresses we'll access 
// when a non-1-1 translation will occur, otherwise usually the 
// "translate_space" variable by itself is used (it's first setup to the 
// desired address, and either data or the return instructions are placed 
// where we expect the MMU to translate to)
 
#include "cpu-utils.h"
#include "spr-defs.h"
#include "board.h"
// Uncomment uart.h include for UART output
//#include "uart.h"
//#include "printf.h"
 
// Uncomment the following to completely remove all printfs, or comment them
// out to enable printf()s, but slows down RTL simulation a lot.
#undef printf
#define printf(a, ...)
 
#include "or1200-defines.h"
 
#ifdef OR1200_NO_IMMU
# error
# error Processor has no instruction MMU. Cannot run this test without it.
# error
#endif
 
#ifdef OR1200_NO_DMMU
# error
# error Processor has no data MMU. Cannot run this test without it.
# error
#endif
 
 
// Define to run only tests on SHORT_TEST_NUM TLB sets
#define SHORT_TEST
#define SHORT_TEST_NUM 4
 
// Defines useful when wishing to skip instruction or data MMU tests when doing
// development on one or the other.
 
// Set this to 1 to enable the IMMU tests
#define DO_IMMU_TESTS 1
// Set this to 1 to enable the DMMU tests
#define DO_DMMU_TESTS 0
 
// Symbols defined in linker script
extern unsigned long _endtext;
extern unsigned long _stext;
extern unsigned long _edata;
extern unsigned long _stack;
 
unsigned long start_text_addr;
unsigned long end_text_addr;
unsigned long end_data_addr;
 
/* For shorter simulation run */
#define RTL_SIM 1
 
/* Define RAM physical location and size 
Bottom half will be used for this program, the rest 
will be used for testing */
#define RAM_START   0x00000000
// Assume only 2MB memory
#ifndef RAM_SIZE
# define RAM_SIZE    0x00200000
#endif
 
#define VM_BASE 0xc0000000
 
/* What is the last address in ram that is used by this program */
#define TEXT_START_ADD start_text_addr
#define TEXT_END_ADD end_text_addr
#define DATA_END_ADD end_data_addr
 
// Pages to start tests at. This should correspond to where the stack is set. 
// We can set this by hand or figure it out at runtime.
// Uncomment the following 3 lines to hard-set the bottom page to test at:
//#define TLB_BOTTOM_TEST_PAGE_HARDSET
//#define TLB_TEXT_SET_NB 16
//#define TLB_DATA_SET_NB 16
 
// Uncomment the following to determine the page to test from at run-time
unsigned long TLB_TEXT_SET_NB;
unsigned long TLB_DATA_SET_NB;
 
/* MMU page size */
#define PAGE_SIZE 8192
 
/* Number of DTLB sets used (power of 2, max is 256) */
#define DTLB_SETS 64
 
/* Number of DTLB ways (1, 2, 3 etc., max is 4). */
#define DTLB_WAYS 1
 
/* Number of ITLB sets used (power of 2, max is 256) */
#define ITLB_SETS 64
 
/* Number of ITLB ways (1, 2, 3 etc., max is 4). */
#define ITLB_WAYS 1
 
/* TLB mode codes */
#define TLB_CODE_ONE_TO_ONE     0x00000000
#define TLB_CODE_PLUS_ONE_PAGE  0x10000000
#define TLB_CODE_MINUS_ONE_PAGE 0x20000000
 
#define TLB_CODE_MASK   0xfffff000
#define TLB_PR_MASK     0x00000fff
 
 
 
/* fails if x is false */
#define ASSERT(x) ((x)?1: fail (__FUNCTION__, __LINE__))
 
// iMMU and dMMU enable functions
extern void lo_dmmu_en (void);
extern void lo_immu_en (void);
 
/* Local functions prototypes */
void dmmu_disable (void);
void immu_disable (void);
 
// Machine code for l.jr r9 and then l.nop
#define OR32_L_JR_R9 0x44004800
#define OR32_L_NOP 0x15000000
 
/* Global variables */
extern unsigned long ram_end;
 
/* DTLB mode status */
volatile unsigned long dtlb_val;
 
/* ITLB mode status */
volatile unsigned long itlb_val;
 
/* DTLB miss counter */
volatile int dtlb_miss_count;
 
/* Data page fault counter */
volatile int dpage_fault_count;
 
/* ITLB miss counter */
volatile int itlb_miss_count;
 
/* Instruction page fault counter */
volatile int ipage_fault_count;
 
/* EA of last DTLB miss exception */
unsigned long dtlb_miss_ea;
 
/* EA of last data page fault exception */
unsigned long dpage_fault_ea;
 
/* EA of last ITLB miss exception */
unsigned long itlb_miss_ea;
 
/* EA of last insn page fault exception */
unsigned long ipage_fault_ea;
 
 
#define sys_call() __asm__ __volatile__("l.sys\t0");
/*
void sys_call (void)
{
  asm("l.sys\t0");
}
*/
void fail (char *func, int line)
{
#ifndef __FUNCTION__
#define __FUNCTION__ "?"
#endif
 
  /* Trigger sys call exception to enable supervisor mode again */
  sys_call ();
 
  immu_disable ();
  dmmu_disable ();
 
  report(line);
  report (0xeeeeeeee);
  exit (1);
}
 
void call(unsigned long add)
{
  asm("l.jalr\t\t%0" : : "r" (add) : "r9", "r11");
  asm("l.nop" : :);
}
 
void jump(void)
{
  return;
  /*asm("_jr:");
  asm("l.jr\t\tr9") ;
  asm("l.nop" : :);*/
}
 
void copy_jump(unsigned long phy_add)
{
  memcpy((void *)phy_add, (void *)&jump, (8*4));
}
 
/* Bus error exception handler */
void bus_err_handler (void)
{
  /* This shouldn't happend */
  printf("Test failed: Bus error\n");
  report (0xeeeeeeee);
  exit (1);
}
 
/* Illegal insn exception handler */
void ill_insn_handler (void)
{
  /* This shouldn't happend */
  printf("Test failed: Illegal insn\n");
  report (0xeeeeeeee);
  exit (1);
}
 
/* Sys call exception handler */
void sys_call_handler (void)
{
  /* Set supervisor mode */
  mtspr (SPR_ESR_BASE, mfspr (SPR_ESR_BASE) | SPR_SR_SM);
}
 
/* DTLB miss exception handler */
void dtlb_miss_handler (void)
{
  unsigned long ea, ta, tlbtr;
  int set, way = 0;
  int i;
 
  /* Get EA that cause the exception */
  ea = mfspr (SPR_EEAR_BASE);
 
  /* Find TLB set and LRU way */
  set = (ea / PAGE_SIZE) % DTLB_SETS;
  for (i = 0; i < DTLB_WAYS; i++) {
    if ((mfspr (SPR_DTLBMR_BASE(i) + set) & SPR_DTLBMR_LRU) == 0) {
      way = i;
      break;
    }
  }
 
  printf("dtlb miss ea = %.8lx set = %d way = %d\n", ea, set, way);
 
  // Anything under the stack belongs to the program, direct tranlsate it
  if (ea < (unsigned long)&_stack){
    /* If this is acces to data of this program set one to one translation */
    mtspr (SPR_DTLBMR_BASE(way) + set, (ea & SPR_DTLBMR_VPN) | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(way) + set, (ea & SPR_DTLBTR_PPN) | DTLB_PR_NOLIMIT);
    return;
  }
 
  /* Update DTLB miss counter and EA */
  dtlb_miss_count++;
  dtlb_miss_ea = ea;
 
  // Everything gets translated back to the space halfway through RAM
  ta = (set*PAGE_SIZE) + RAM_START + (RAM_SIZE/2);
  tlbtr = (ta & SPR_DTLBTR_PPN) | (dtlb_val & TLB_PR_MASK);
  printf("ta = %.8lx tlbtr = %.8lx dtlb_val = %.8lx\n",ta, tlbtr, dtlb_val);
 
  /* Set DTLB entry */
  mtspr (SPR_DTLBMR_BASE(way) + set, (ea & SPR_DTLBMR_VPN) | SPR_DTLBMR_V);
  mtspr (SPR_DTLBTR_BASE(way) + set, tlbtr);
}
 
/* Data page fault exception handler */
void dpage_fault_handler (void)
{
  unsigned long ea;
  int set, way = 0;
  int i;
 
  /* Get EA that cause the exception */
  ea = mfspr (SPR_EEAR_BASE);
 
  /* Find TLB set and way */
  set = (ea / PAGE_SIZE) % DTLB_SETS;
  for (i = 0; i < DTLB_WAYS; i++) {
    if ((mfspr (SPR_DTLBMR_BASE(i) + set) & SPR_DTLBMR_VPN) == 
	(ea & SPR_DTLBMR_VPN)) {
      way = i;
      break;
    }
  }
 
  printf("ea = %.8lx set = %d way = %d\n", ea, set, way);
 
  if (((RAM_START <= ea) & (ea < DATA_END_ADD) ) | 
      ((TEXT_START_ADD <= ea) & (ea < TEXT_END_ADD))) {
    /* If this is acces to data of this program set one to one translation */
    mtspr (SPR_DTLBTR_BASE(way) + set, (ea & SPR_DTLBTR_PPN) | DTLB_PR_NOLIMIT);
    return;
  }
 
  /* Update data page fault counter and EA */
  dpage_fault_count++;
  dpage_fault_ea = ea;
 
  /* Give permission */
  mtspr (SPR_DTLBTR_BASE(way) + set, 
	 (mfspr (SPR_DTLBTR_BASE(way) + set) & ~DTLB_PR_NOLIMIT) | dtlb_val);
}
 
 
/* ITLB miss exception handler */
void itlb_miss_handler (void)
{
  unsigned long ea, ta, tlbtr;
  int set, way = 0;
  int i;
 
  /* Get EA that cause the exception */
  ea = mfspr (SPR_EEAR_BASE);
 
  /* Find TLB set and LRU way */
  set = (ea / PAGE_SIZE) % ITLB_SETS;
  for (i = 0; i < ITLB_WAYS; i++) {
    if ((mfspr (SPR_ITLBMR_BASE(i) + set) & SPR_ITLBMR_LRU) == 0) {
      way = i;
      break;
    }
  }
 
  printf("itlb miss ea = %.8lx set = %d way = %d\n", ea, set, way);
 
  if ((TEXT_START_ADD <= ea) && (ea < TEXT_END_ADD)) {
    /* If this is acces to data of this program set one to one translation */
    mtspr (SPR_ITLBMR_BASE(way) + set, (ea & SPR_ITLBMR_VPN) | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(way) + set, (ea & SPR_ITLBTR_PPN) | ITLB_PR_NOLIMIT);
    return;
  }
 
  /* Update ITLB miss counter and EA */
  itlb_miss_count++;
  itlb_miss_ea = ea;
 
  /* Whatever access is in progress, translated address have to point to 
     physical RAM */
 
  ta = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
  tlbtr = (ta & SPR_ITLBTR_PPN) | (itlb_val & TLB_PR_MASK);
 
  printf("ta = %.8lx\n", ta);
 
  /* Set ITLB entry */
  mtspr (SPR_ITLBMR_BASE(way) + set, (ea & SPR_ITLBMR_VPN) | SPR_ITLBMR_V);
  mtspr (SPR_ITLBTR_BASE(way) + set, tlbtr);
}
 
/* Intstruction page fault exception handler */
void ipage_fault_handler (void)
{
  unsigned long ea;
  int set, way = 0;
  int i;
 
  /* Get EA that cause the exception */
  ea = mfspr (SPR_EEAR_BASE);
 
  /* Find TLB set and way */
  set = (ea / PAGE_SIZE) % ITLB_SETS;
  for (i = 0; i < ITLB_WAYS; i++) {
    if ((mfspr (SPR_ITLBMR_BASE(i) + set) & SPR_ITLBMR_VPN) == (ea & SPR_ITLBMR_VPN)) {
      way = i;
      break;
    }
  }
 
  printf("ipage fault: ea = %.8lx set = %d way = %d\n", ea, set, way);
 
  if ((TEXT_START_ADD <= ea) && (ea < TEXT_END_ADD)) {
    /* If this is acces to data of this program set one to one translation */
    mtspr (SPR_DTLBTR_BASE(way) + set, (ea & SPR_DTLBTR_PPN) | ITLB_PR_NOLIMIT);
    return;
  }
 
  printf("ipage fault was outside of code area\n", ea, set, way);
 
  /* Update instruction page fault counter and EA */
  ipage_fault_count++;
  ipage_fault_ea = ea;
 
  /* Give permission */
  mtspr (SPR_ITLBTR_BASE(way) + set, (mfspr (SPR_ITLBTR_BASE(way) + set) & ~ITLB_PR_NOLIMIT) | itlb_val);
}
 
/* Invalidate all entries in DTLB and enable DMMU */
void dmmu_enable (void)
{
  /* Register DTLB miss handler */
  add_handler(0x9, dtlb_miss_handler);
  //excpt_dtlbmiss = (unsigned long)dtlb_miss_handler;
 
  /* Register data page fault handler */
  add_handler(0x3, dpage_fault_handler);
  //excpt_dpfault = (unsigned long)dpage_fault_handler;
 
  /* Enable DMMU */
  lo_dmmu_en ();
 
}
 
/* Disable DMMU */
void dmmu_disable (void)
{
  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_DME);
}
 
/* Invalidate all entries in ITLB and enable IMMU */
void immu_enable (void)
{
  /* Register ITLB miss handler */
  add_handler(0xa, itlb_miss_handler);
  //excpt_itlbmiss = (unsigned long)itlb_miss_handler;
 
  /* Register instruction page fault handler */
  add_handler(0x4, ipage_fault_handler);
  //excpt_ipfault = (unsigned long)ipage_fault_handler;
 
  /* Enable IMMU */
  lo_immu_en ();
 
}
 
/* Disable IMMU */
void immu_disable (void)
{
  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_IME);
}
 
void write_pattern(unsigned long start, unsigned long end)
{
  unsigned long add;
 
  add = start;
  while (add < end) {
    REG32(add) = add;
    add += PAGE_SIZE;
  }
 
}
 
/* Translation address register test
Set various translation and check the pattern */
int dtlb_translation_test (void)
{
  int i, j;
  unsigned long ea, ta;
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("dtlb translation test set\n");
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    for (j = 0; j < DTLB_SETS; j++) {
      mtspr (SPR_DTLBMR_BASE(i) + j, 0);
      mtspr (SPR_DTLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for program's data space */
  for (i = 0; i < TLB_DATA_SET_NB; i++) {
    ea = RAM_START + (i*PAGE_SIZE);
    ta = RAM_START + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(0) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(0) + i, ta | (DTLB_PR_NOLIMIT));
  } 
 
  /* Set dtlb permisions */
  dtlb_val = DTLB_PR_NOLIMIT;
 
  /* Write test pattern */
  for (i = 0; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    REG32(ea) = i;
    ea = RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4;
    REG32(ea) = 0xffffffff - i;
  }
 
  /* Set one to one translation */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    ta = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(DTLB_WAYS - 1) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + i, ta | DTLB_PR_NOLIMIT);
  }
 
  /* Enable DMMU */
  dmmu_enable();
 
  /* Check the pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    ASSERT(REG32(ea) == i);
    ea = RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4;
    ASSERT(REG32(ea) == (0xffffffff - i));
  }
 
  /* Write new pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    REG32(ea) = 0xffffffff - i;
    ea = RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4;
    REG32(ea) = i;
  }
 
  /* Set 0 -> RAM_START + (RAM_SIZE/2) translation */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = i*PAGE_SIZE;
    ta = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(DTLB_WAYS - 1) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + i, ta | DTLB_PR_NOLIMIT);
  }
 
  /* Check the pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = i*PAGE_SIZE;
    ASSERT(REG32(ea) == (0xffffffff - i));
    ea = ((i + 1)*PAGE_SIZE) - 4;
    ASSERT(REG32(ea) == i);
  }
 
  /* Write new pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    REG32(i*PAGE_SIZE) = i;
    REG32(((i + 1)*PAGE_SIZE) - 4) = 0xffffffff - i; 
  }
 
  /* Set hi -> lo, lo -> hi translation */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    ta = RAM_START + (RAM_SIZE/2) + ((DTLB_SETS - i - 1 + TLB_DATA_SET_NB)*
				     PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(DTLB_WAYS - 1) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + i, ta | DTLB_PR_NOLIMIT);
  }
 
  /* Check the pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    ASSERT(REG32(ea) == (DTLB_SETS - i - 1 + TLB_DATA_SET_NB));
    ea = RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4;
    ASSERT(REG32(ea) == (0xffffffff - DTLB_SETS + i + 1 - TLB_DATA_SET_NB));
  }
 
  /* Write new pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    REG32(RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE)) = 0xffffffff - i;
    REG32(RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4) = i;
  }
 
  /* Disable DMMU */
  dmmu_disable();
 
  /* Check the pattern */
  for (i = TLB_DATA_SET_NB; i < DTLB_SETS; i++) {
    ea = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    ASSERT(REG32(ea) == (0xffffffff - DTLB_SETS + i + 1 - TLB_DATA_SET_NB));
    ea = RAM_START + (RAM_SIZE/2) + ((i + 1)*PAGE_SIZE) - 4;
    ASSERT(REG32(ea) == (DTLB_SETS - i - 1 + TLB_DATA_SET_NB));
  }
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
/* EA match register test
Shifting one in DTLBMR and performing accesses to boundaries
of the page, checking the triggering of exceptions */
int dtlb_match_test (int way, int set)
{
  int i, j, tmp;
  unsigned long add, t_add;
  unsigned long ea, ta;
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("dtlb_match_test - way %d set %d\n",way, set);
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    for (j = 0; j < DTLB_SETS; j++) {
      mtspr (SPR_DTLBMR_BASE(i) + j, 0);
      mtspr (SPR_DTLBTR_BASE(i) + j, 0);
    }
  }
 
  // Program text/data pages should be 1-1 translation
  for (i = 0; i < TLB_DATA_SET_NB; i++) {
    ea = RAM_START + (i*PAGE_SIZE);
    ta = RAM_START + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(0) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(0) + i, ta | DTLB_PR_NOLIMIT);
  } 
 
  /* Set dtlb permisions */
  dtlb_val = DTLB_PR_NOLIMIT;
 
  // Setup match area address - based at halfway through RAM, 
  // and then offset by the area encompassed by the set we wish to test.
  unsigned long translate_space = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
 
  /* Set pattern */
  // Last word of page before the one covered by this set
  REG32(translate_space - 4) = 0x00112233;
  //printf("pattern0 @ 0x%.8lx = 0x%.8lx\n", translate_space-4, REG32(translate_space - 4) );
  // First word of page covered by this set
  REG32(translate_space) = 0x44556677;
  // Last word of page covered by this set
  REG32(translate_space + PAGE_SIZE - 4) = 0x8899aabb;
  // First word of page covered by next set
  REG32(translate_space + PAGE_SIZE) = 0xccddeeff;
 
  /* Enable DMMU */
  dmmu_enable();
 
  /* Shifting one in DTLBMR */ 
  i = 0;
 
  // Setup match space - place we will do accesses to, and have them
  // tranlsated into the translate space addresses
  unsigned long match_space = (PAGE_SIZE*DTLB_SETS) + (set*PAGE_SIZE);  // 
 
  //add = (PAGE_SIZE*DTLB_SETS); // 8kB * 64, 512KB
  //t_add = add + (set*PAGE_SIZE); // 
  while (add != 0x00000000) { 
    // Set MATCH register for the areas we will access explicitly, and validate it
    mtspr (SPR_DTLBMR_BASE(way) + set, match_space | SPR_DTLBMR_V);
    // Set TRANSLATE register to the areas where we have set our data
    mtspr (SPR_DTLBTR_BASE(way) + set, translate_space | DTLB_PR_NOLIMIT);
 
    /* Reset DTLB miss counter and EA */
    dtlb_miss_count = 0;
    dtlb_miss_ea = 0;
 
    //if (((match_space < RAM_START) || (t_add >= DATA_END_ADD)) && 
    //	((t_add < TEXT_START_ADD) || (t_add >= TEXT_END_ADD))) {
    if (match_space > DATA_END_ADD){
 
      /* Read last address of previous page */
      tmp = REG32(match_space - 4);
      ASSERT(tmp == 0x00112233);
      ASSERT(dtlb_miss_count == 1);
 
      /* Read first address of the page */
      tmp = REG32(match_space);
      ASSERT(tmp == 0x44556677);
      ASSERT(dtlb_miss_count == 1);
 
      /* Read last address of the page */
      tmp = REG32(match_space + PAGE_SIZE - 4);
      ASSERT(tmp == 0x8899aabb);
      ASSERT(dtlb_miss_count == 1);
 
      /* Read first address of next page */
      tmp = REG32(match_space + PAGE_SIZE);
      ASSERT(tmp == 0xccddeeff);
      ASSERT(dtlb_miss_count == 2);
    }
 
    i++;
    add = (PAGE_SIZE*DTLB_SETS) << i;
    match_space = add + (set*PAGE_SIZE);
 
    for (j = 0; j < DTLB_WAYS; j++) {
      mtspr (SPR_DTLBMR_BASE(j) + ((set - 1) & (DTLB_SETS - 1)), 0);
      mtspr (SPR_DTLBMR_BASE(j) + ((set + 1) & (DTLB_SETS - 1)), 0);
    }
  }
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
/* Valid bit test
Set all ways of one set to be invalid, perform
access so miss handler will set them to valid, 
try access again - there should be no miss exceptions */
int dtlb_valid_bit_test (int set)
{
  int i, j;
  unsigned long ea, ta;
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("dtlb_valid_bit_test, set %d\n", set);
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    for (j = 0; j < DTLB_SETS; j++) {
      mtspr (SPR_DTLBMR_BASE(i) + j, 0);
      mtspr (SPR_DTLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_DATA_SET_NB; i++) {
    ea = RAM_START + (i*PAGE_SIZE);
    ta = RAM_START + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(0) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(0) + i, ta | DTLB_PR_NOLIMIT);
  } 
 
  /* Reset DTLB miss counter and EA */
  dtlb_miss_count = 0;
  dtlb_miss_ea = 0;
 
  /* Set dtlb permisions */
  dtlb_val = DTLB_PR_NOLIMIT;
 
  /* Resetv DTLBMR for every way */
  for (i = 0; i < DTLB_WAYS; i++) {
    mtspr (SPR_DTLBMR_BASE(i) + set, 0);
  }
 
  /* Enable DMMU */
  dmmu_enable();
 
  /* Perform writes to address, that is not in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    REG32(RAM_START + RAM_SIZE + (i*DTLB_SETS*PAGE_SIZE) + (set*PAGE_SIZE)) = i;
 
    /* Check if there was DTLB miss */
    ASSERT(dtlb_miss_count == (i + 1));
    ASSERT(dtlb_miss_ea == (RAM_START + RAM_SIZE + (i*DTLB_SETS*PAGE_SIZE) + (set*PAGE_SIZE)));
  }
 
  /* Reset DTLB miss counter and EA */
  dtlb_miss_count = 0;
  dtlb_miss_ea = 0;
 
  /* Perform reads to address, that is now in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    ASSERT(REG32(RAM_START + RAM_SIZE + (i*DTLB_SETS*PAGE_SIZE) + (set*PAGE_SIZE)) == i);
 
    /* Check if there was DTLB miss */
    ASSERT(dtlb_miss_count == 0);
  }
 
  /* Reset valid bits */
  for (i = 0; i < DTLB_WAYS; i++) {
    mtspr (SPR_DTLBMR_BASE(i) + set, mfspr (SPR_DTLBMR_BASE(i) + set) & ~SPR_DTLBMR_V);
  }
 
  /* Perform reads to address, that is now in DTLB but is invalid */
  for (i = 0; i < DTLB_WAYS; i++) {
    ASSERT(REG32(RAM_START + RAM_SIZE + (i*DTLB_SETS*PAGE_SIZE) + (set*PAGE_SIZE)) == i);
 
    /* Check if there was DTLB miss */
    ASSERT(dtlb_miss_count == (i + 1));
    ASSERT(dtlb_miss_ea == (RAM_START + RAM_SIZE + (i*DTLB_SETS*PAGE_SIZE) + (set*PAGE_SIZE)));
  }
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
/* Permission test
Set various permissions, perform r/w access 
in user and supervisor mode and chack triggering 
of page fault exceptions */
int dtlb_permission_test (int set)
{ 
  int i, j;
  unsigned long ea, ta, tmp;
 
  printf("dtlb_permission_test, set %d\n", set);
 
  /* Disable DMMU */
  dmmu_disable();
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    for (j = 0; j < DTLB_SETS; j++) {
      mtspr (SPR_DTLBMR_BASE(i) + j, 0);
      mtspr (SPR_DTLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_DATA_SET_NB; i++) {
    ea = RAM_START + (i*PAGE_SIZE);
    ta = RAM_START + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(0) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(0) + i, ta | DTLB_PR_NOLIMIT);
  } 
 
  /* Testing page */
  ea = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
 
  /* Set match register */
  mtspr (SPR_DTLBMR_BASE(DTLB_WAYS - 1) + set, ea | SPR_DTLBMR_V);
 
  /* Reset page fault counter and EA */
  dpage_fault_count = 0;
  dpage_fault_ea = 0;
 
  /* Enable DMMU */
  dmmu_enable();
 
  /* Write supervisor */
  dtlb_val = DTLB_PR_NOLIMIT | SPR_DTLBTR_SWE;
  mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + set, ea | (DTLB_PR_NOLIMIT & ~SPR_DTLBTR_SWE));
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 0) = 0x00112233;
  ASSERT(dpage_fault_count == 1);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 4) = 0x44556677;
  ASSERT(dpage_fault_count == 1);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 8) = 0x8899aabb;
  ASSERT(dpage_fault_count == 1);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 12) = 0xccddeeff;
  ASSERT(dpage_fault_count == 1);
 
  /* Read supervisor */
  dtlb_val = DTLB_PR_NOLIMIT | SPR_DTLBTR_SRE;
  mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + set, ea | (DTLB_PR_NOLIMIT & ~SPR_DTLBTR_SRE));
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 0);
  ASSERT(dpage_fault_count == 2);
  ASSERT(tmp == 0x00112233);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 4);
  ASSERT(dpage_fault_count == 2);
  ASSERT(tmp == 0x44556677);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 8);
  ASSERT(dpage_fault_count == 2);
  ASSERT(tmp == 0x8899aabb);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 12);
  ASSERT(dpage_fault_count == 2);
  ASSERT(tmp == 0xccddeeff);
 
  /* Write user */
  dtlb_val = DTLB_PR_NOLIMIT | SPR_DTLBTR_UWE;
  mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + set, ea | (DTLB_PR_NOLIMIT & ~SPR_DTLBTR_UWE));
 
  /* Set user mode */
  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_SM);
 
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 0) = 0xffeeddcc;
  ASSERT(dpage_fault_count == 3);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 4) = 0xbbaa9988;
  ASSERT(dpage_fault_count == 3);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 8) = 0x77665544;
  ASSERT(dpage_fault_count == 3);
  REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 12) = 0x33221100;
  ASSERT(dpage_fault_count == 3);
 
  /* Trigger sys call exception to enable supervisor mode again */
  sys_call ();
 
  /* Read user mode */
  dtlb_val = DTLB_PR_NOLIMIT | SPR_DTLBTR_URE;
  mtspr (SPR_DTLBTR_BASE(DTLB_WAYS - 1) + set, ea | (DTLB_PR_NOLIMIT & ~SPR_DTLBTR_URE));
 
  /* Set user mode */
  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_SM);
 
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 0);
  ASSERT(dpage_fault_count == 4);
  ASSERT(tmp == 0xffeeddcc);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 4);
  ASSERT(dpage_fault_count == 4);
  ASSERT(tmp == 0xbbaa9988);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 8);
  ASSERT(dpage_fault_count == 4);
  ASSERT(tmp == 0x77665544);
  tmp = REG32(RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) + 12);
  ASSERT(dpage_fault_count == 4);
  ASSERT(tmp == 0x33221100);
 
  /* Trigger sys call exception to enable supervisor mode again */
  sys_call ();
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
 
/* Dcache test - check inhibit
   Write data with cache inhibit on and off, check for coherency
 */
int dtlb_dcache_test (int set)
{ 
  int i, j;
  unsigned long ea, ta, vmea;
  unsigned long testwrite_to_be_cached, testwrite_not_to_be_cached;
 
  // This test can't be run if set==DTLB_SETS-1
  if (set==(DTLB_SETS-1))
    return 0;
 
  // Check data cache is present and enabled
  if (!(mfspr(SPR_UPR)& SPR_UPR_DCP))
    return 0;
 
  if (!(mfspr(SPR_SR) & SPR_SR_DCE))
    return 0;
 
  printf("dtlb_dcache_test, set %d\n", set);
 
  /* Disable DMMU */
  dmmu_disable();
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < DTLB_WAYS; i++) {
    for (j = 0; j < DTLB_SETS; j++) {
      mtspr (SPR_DTLBMR_BASE(i) + j, 0);
      mtspr (SPR_DTLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_DATA_SET_NB; i++) {
    ea = RAM_START + (i*PAGE_SIZE);
    ta = RAM_START + (i*PAGE_SIZE);
    mtspr (SPR_DTLBMR_BASE(0) + i, ea | SPR_DTLBMR_V);
    mtspr (SPR_DTLBTR_BASE(0) + i, ta | DTLB_PR_NOLIMIT);
  } 
 
  /* Use (RAM_START + (RAM_SIZE/2)) as location we'll poke via MMUs */
  /* Configure a 1-1 mapping for it, and a high->low mapping for it */
 
  /* Testing page */
  ea = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
 
  /* Ultimate physical address */
  ta = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
 
  /* Set a virtual address to translate via last TLB cache set */
  vmea = VM_BASE + RAM_START + (RAM_SIZE/2) + ((DTLB_SETS-1)*PAGE_SIZE);
 
  // Set a 1-1 translation for this page without cache inhibited
  /* Set match register */
  mtspr (SPR_DTLBMR_BASE(0) + set, ea | SPR_DTLBMR_V);  
  /* Set translate register */
  mtspr (SPR_DTLBTR_BASE(0) + set, ta | DTLB_PR_NOLIMIT);  
 
  /* Now set a far-off translation, VM_BASE, for this page with cache 
     using the last set */
 
  /* Set match register */
  mtspr (SPR_DTLBMR_BASE(0) + (DTLB_SETS-1), vmea | SPR_DTLBMR_V);
  /* Set translate register */
  mtspr (SPR_DTLBTR_BASE(0) + (DTLB_SETS-1), ta | DTLB_PR_NOLIMIT | 
	 SPR_DTLBTR_CI);
 
  /* Invalidate this location in cache, to force reload when we read */
  mtspr (/*SPR_DCR_BASE(0) +*/ SPR_DCBIR, ea);
 
  /* Enable DMMU */
  dmmu_enable();
 
  // First do a write with the cache inhibited mapping
  testwrite_to_be_cached = 0xfeca1d0d ^ set;
 
  REG32((vmea)) = testwrite_to_be_cached;
 
  // Read it back to check that it's the same, this read should get cached
  ASSERT(REG32(ea) == testwrite_to_be_cached);
 
  // Now write again to the cache inhibited location
  testwrite_not_to_be_cached = 0xbaadbeef ^ set;
 
  REG32((vmea)) = testwrite_not_to_be_cached;
 
  // Now check that the cached mapping doesn't read this value back
  ASSERT(REG32(ea) == testwrite_to_be_cached);
 
  // Now disable cache inhibition on the 1-1 mapping
  /* Set translate register */
  mtspr (SPR_DTLBTR_BASE(0) + set, 
	 ea | DTLB_PR_NOLIMIT | SPR_DTLBTR_CI);
 
  // Check that we now get the second value we wrote
  testwrite_to_be_cached = testwrite_not_to_be_cached;
 
  ASSERT(REG32(ea) == testwrite_to_be_cached);
 
  /* Disable DMMU */
  dmmu_disable();
 
  printf("-------------------------------------------\n");
 
  return 0;
 
}
 
/* Translation address register test
Set various translation and check the pattern */
int itlb_translation_test (void)
{
  int i, j;
  //unsigned long ea, ta;
  unsigned long translate_space;  
  unsigned long match_space;
  printf("itlb_translation_test\n");
 
  /* Disable IMMU */
  immu_disable();
 
  /* Invalidate all entries in DTLB */
  for (i = 0; i < ITLB_WAYS; i++) {
    for (j = 0; j < ITLB_SETS; j++) {
      mtspr (SPR_ITLBMR_BASE(i) + j, 0);
      mtspr (SPR_ITLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_TEXT_SET_NB; i++) {
    match_space = TEXT_START_ADD + (i*PAGE_SIZE);
    translate_space = TEXT_START_ADD + (i*PAGE_SIZE);
    mtspr (SPR_ITLBMR_BASE(0) + i, match_space | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(0) + i, translate_space | ITLB_PR_NOLIMIT);
  } 
 
  /* Set itlb permisions */
  itlb_val = ITLB_PR_NOLIMIT;
 
 
  /* Write test program */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    translate_space = (RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE) + (i*0x10));
    //printf("writing app to 0x%.8lx to be translated in set %d\n",translate_space, i);
    REG32(translate_space) = OR32_L_JR_R9;
    REG32(translate_space + 4) = OR32_L_NOP;
    // Now flush this in case DC isn't on write-through
    mtspr(SPR_DCBFR, translate_space);
    mtspr(SPR_DCBFR, translate_space+4);
 
  }
 
  /* Set one to one translation of the last way of ITLB */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    translate_space = (RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE) + (i*0x10));
    mtspr (SPR_ITLBMR_BASE(ITLB_WAYS - 1) + i, translate_space | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(ITLB_WAYS - 1) + i, 
	   translate_space | ITLB_PR_NOLIMIT);
  }
 
  /* Enable IMMU */
  immu_enable();
 
  /* Check the tranlsation works by jumping there */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    translate_space = (RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE) + (i*0x10));
    //printf("calling 0x%.8lx - should use set %d\n",translate_space, i);
    call (translate_space);
  }
 
  /* Set hi -> lo, lo -> hi translation */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    match_space = RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE);
    translate_space = RAM_START + (RAM_SIZE/2) + 
      (((ITLB_SETS-1)+TLB_TEXT_SET_NB - i)*PAGE_SIZE);
    printf("setting itlb set %d match -> trans = 0x%.8lx -> 0x%.8lx\n", 
	   i, match_space, translate_space);
    mtspr (SPR_ITLBMR_BASE(ITLB_WAYS - 1) + i, match_space | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(ITLB_WAYS - 1) + i, translate_space|ITLB_PR_NOLIMIT);
  }
 
  /* Check the pattern */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    match_space = RAM_START + (RAM_SIZE/2) + (((ITLB_SETS-1)+TLB_TEXT_SET_NB - i)*PAGE_SIZE) + (i*0x10);
    printf("immu hi->lo check - calling 0x%.8lx\n",match_space);
    call(match_space);
  }
 
  /* Disable IMMU */
  immu_disable ();
 
  /* Check the pattern */
  for (i = TLB_TEXT_SET_NB; i < ITLB_SETS; i++) {
    translate_space = (RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE) + (i*0x10));
    //call (RAM_START + (RAM_SIZE/2) + (i*PAGE_SIZE) + (i*0x10));
    //printf("immu disabled check of set %d - calling 0x%.8lx\n",i, translate_space);
    call (translate_space);
  }
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
/* EA match register test
Shifting one in ITLBMR and performing accesses to boundaries
of the page, checking the triggering of exceptions */
int itlb_match_test (int way, int set)
{
  int i, j;
  unsigned long add, t_add;
  unsigned long ea, ta;
 
  printf("itlb_match_test\n");
 
  /* Disable IMMU */
  immu_disable();
 
  /* Invalidate all entries in ITLB */
  for (i = 0; i < ITLB_WAYS; i++) {
    for (j = 0; j < ITLB_SETS; j++) {
      mtspr (SPR_ITLBMR_BASE(i) + j, 0);
      mtspr (SPR_ITLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_TEXT_SET_NB; i++) {
    ea = TEXT_START_ADD + (i*PAGE_SIZE);
    ta = TEXT_START_ADD + (i*PAGE_SIZE);
    mtspr (SPR_ITLBMR_BASE(0) + i, ea | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(0) + i, ta | ITLB_PR_NOLIMIT);
  } 
 
  /* Set dtlb permisions */
  itlb_val = ITLB_PR_NOLIMIT;
 
 
  // Write program which will just return into these places
  unsigned long translate_space = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
  //copy_jump (RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE) - 8);
  REG32(translate_space-8) = OR32_L_JR_R9;
  REG32(translate_space-4) = OR32_L_NOP;
  //copy_jump (RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE));
  REG32(translate_space) = OR32_L_JR_R9;
  REG32(translate_space+4) = OR32_L_NOP;  
  //copy_jump (RAM_START + (RAM_SIZE/2) + (set + 1)*PAGE_SIZE - 8);
  REG32(translate_space + PAGE_SIZE - 8) = OR32_L_JR_R9;
  REG32(translate_space + PAGE_SIZE - 4) = OR32_L_NOP;  
  //copy_jump (RAM_START + (RAM_SIZE/2) + (set + 1)*PAGE_SIZE);
  REG32(translate_space + PAGE_SIZE) = OR32_L_JR_R9;
  REG32(translate_space + PAGE_SIZE + 4) = OR32_L_NOP;  
  // Flush these areas incase cache doesn't write them through immediately
  mtspr(SPR_DCBFR, translate_space-8);
  mtspr(SPR_DCBFR, translate_space);
  mtspr(SPR_DCBFR, translate_space+4);
  mtspr(SPR_DCBFR, translate_space + PAGE_SIZE - 8);
  mtspr(SPR_DCBFR, translate_space + PAGE_SIZE - 4);
  mtspr(SPR_DCBFR, translate_space + PAGE_SIZE);
  mtspr(SPR_DCBFR, translate_space + PAGE_SIZE + 4);
 
  /* Enable IMMU */
  immu_enable();
 
  /* Shifting one in ITLBMR */ 
  i = 0;
  //add = (PAGE_SIZE*ITLB_SETS);
  //t_add = add + (set*PAGE_SIZE);
  // Space we'll access and expect the MMU to translate our requests
  unsigned long match_space = (PAGE_SIZE*DTLB_SETS) + (set*PAGE_SIZE); 
  while (add != 0x00000000) { 
    mtspr (SPR_ITLBMR_BASE(way) + set,  match_space | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(way) + set,  translate_space | ITLB_PR_NOLIMIT);
 
    /* Reset ITLB miss counter and EA */
    itlb_miss_count = 0;
    itlb_miss_ea = 0;
 
    //if (((t_add < RAM_START) || (t_add >= DATA_END_ADD)) && ((t_add < TEXT_START_ADD) || (t_add >= TEXT_END_ADD))) {
 
      /* Jump on last address of previous page */
      call (match_space - 8);
      ASSERT(itlb_miss_count == 1);
 
      /* Jump on first address of the page */
      call (match_space);
      ASSERT(itlb_miss_count == 1);
 
      /* Jump on last address of the page */
      call (match_space + PAGE_SIZE - 8);
      ASSERT(itlb_miss_count == 1);
 
      /* Jump on first address of next page */
      call (match_space + PAGE_SIZE);
      ASSERT(itlb_miss_count == 2);
      //}
 
    i++;
    add = (PAGE_SIZE*ITLB_SETS) << i;
    match_space = add + (set*PAGE_SIZE);
 
    for (j = 0; j < ITLB_WAYS; j++) {
      mtspr (SPR_ITLBMR_BASE(j) + ((set - 1) & (ITLB_SETS - 1)), 0);
      mtspr (SPR_ITLBMR_BASE(j) + ((set + 1) & (ITLB_SETS - 1)), 0);
    }
  }
 
  printf("-------------------------------------------\n");
 
  /* Disable IMMU */
  immu_disable();
 
  return 0;
}
 
/* Valid bit test
Set all ways of one set to be invalid, perform
access so miss handler will set them to valid, 
try access again - there should be no miss exceptions */
int itlb_valid_bit_test (int set)
{
  int i, j;
  unsigned long ea, ta;
 
  printf("itlb_valid_bit_test set = %d\n", set);
 
  /* Disable IMMU */
  immu_disable();
 
  /* Invalidate all entries in ITLB */
  for (i = 0; i < ITLB_WAYS; i++) {
    for (j = 0; j < ITLB_SETS; j++) {
      mtspr (SPR_ITLBMR_BASE(i) + j, 0);
      mtspr (SPR_ITLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_TEXT_SET_NB; i++) {
    ea = TEXT_START_ADD + (i*PAGE_SIZE);
    ta = TEXT_START_ADD + (i*PAGE_SIZE);
    mtspr (SPR_ITLBMR_BASE(0) + i, ea | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(0) + i, ta | ITLB_PR_NOLIMIT);
  } 
 
  /* Reset ITLB miss counter and EA */
  itlb_miss_count = 0;
  itlb_miss_ea = 0;
 
  /* Set itlb permisions */
  itlb_val = ITLB_PR_NOLIMIT;
 
  /* Resetv ITLBMR for every way after the program code */
  for (i = TLB_TEXT_SET_NB; i < ITLB_WAYS; i++) {
    mtspr (SPR_ITLBMR_BASE(i) + set, 0);
  }
 
  /* Enable IMMU */
  immu_enable();
  // Address we'll jump to and expect it to be translated
  unsigned long match_space = (PAGE_SIZE*ITLB_SETS) + (set*PAGE_SIZE);
  // Address that we will actually access
  unsigned long translate_space = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
  /* Perform jumps to address, that is not in ITLB */
  printf("writing program to 0x%.8lx\n", translate_space);
  REG32(translate_space) = OR32_L_JR_R9;
  REG32(translate_space+4) = OR32_L_NOP;
  mtspr(SPR_DCBFR, translate_space);
  mtspr(SPR_DCBFR, translate_space+4);
  printf("jumping to 0x%.8lx, should be itlb miss\n",match_space);
  call (match_space);
 
  /* Check if there was ITLB miss */
  ASSERT(itlb_miss_count == 1);
  ASSERT(itlb_miss_ea == match_space);
 
  /* Reset ITLB miss counter and EA */
  itlb_miss_count = 0;
  itlb_miss_ea = 0;
  printf("jumping to 0x%.8lx again - should not be a miss\n", match_space);
  /* Perform jumps to address, that is now in ITLB */
  call (match_space);
 
  /* Check if there was ITLB miss */
  ASSERT(itlb_miss_count == 0);
 
  /* Reset valid bits */
  for (i = 0; i < ITLB_WAYS; i++) {
    mtspr (SPR_ITLBMR_BASE(i) + set, mfspr (SPR_ITLBMR_BASE(i) + set) & ~SPR_ITLBMR_V);
  }
  printf("jumping to 0x%.8lx again - mmu entries invalidated, so should be a miss\n", match_space);
  /* Perform jumps to address, that is now in ITLB but is invalid */
  call (match_space);
 
  /* Check if there was ITLB miss */
  ASSERT(itlb_miss_count == 1);
  ASSERT(itlb_miss_ea == match_space);
 
  /* Disable IMMU */
  immu_disable ();
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
/* Permission test
Set various permissions, perform r/w access 
in user and supervisor mode and chack triggering 
of page fault exceptions */
int itlb_permission_test (int set)
{ 
  int i, j;
  unsigned long ea, ta;
 
  printf("itlb_permission_test set = %d\n", set);
 
  /* Disable IMMU */
  immu_disable();
 
  /* Invalidate all entries in ITLB */
  for (i = 0; i < ITLB_WAYS; i++) {
    for (j = 0; j < ITLB_SETS; j++) {
      mtspr (SPR_ITLBMR_BASE(i) + j, 0);
      mtspr (SPR_ITLBTR_BASE(i) + j, 0);
    }
  }
 
  /* Set one to one translation for the use of this program */
  for (i = 0; i < TLB_TEXT_SET_NB; i++) {
    ea = TEXT_START_ADD + (i*PAGE_SIZE);
    ta = TEXT_START_ADD + (i*PAGE_SIZE);
    mtspr (SPR_ITLBMR_BASE(0) + i, ea | SPR_ITLBMR_V);
    mtspr (SPR_ITLBTR_BASE(0) + i, ta | ITLB_PR_NOLIMIT);
  } 
 
  // Address that we will actually access
  unsigned long match_space = RAM_START + (RAM_SIZE/2) + (set*PAGE_SIZE);
 
  /* Set match register */
  mtspr (SPR_ITLBMR_BASE(ITLB_WAYS - 1) + set, match_space | SPR_ITLBMR_V);
 
  /* Reset page fault counter and EA */
  ipage_fault_count = 0;
  ipage_fault_ea = 0;
 
  /* Copy the code */
  REG32(match_space+0x0) = OR32_L_JR_R9;
  REG32(match_space+0x4) = OR32_L_NOP;
  REG32(match_space+0x8) = OR32_L_JR_R9;
  REG32(match_space+0xc) = OR32_L_NOP;
  mtspr(SPR_DCBFR, match_space);
  mtspr(SPR_DCBFR, match_space+4);
  mtspr(SPR_DCBFR, match_space+8);
  mtspr(SPR_DCBFR, match_space+12);
 
  /* Enable IMMU */
  immu_enable ();
 
  /* Execute supervisor */
  printf("execute disable for supervisor - should cause ipage fault\n");
  itlb_val = SPR_ITLBTR_CI | SPR_ITLBTR_SXE;
  mtspr (SPR_ITLBTR_BASE(ITLB_WAYS - 1) + set, match_space | (ITLB_PR_NOLIMIT & ~SPR_ITLBTR_SXE));
  printf("calling address 0x%.8lx\n", match_space);
  call (match_space);
  ASSERT(ipage_fault_count == 1);
  call (match_space + 8);
  ASSERT(ipage_fault_count == 1); 
 
  /* Execute user */
  printf("execute disable for user - should cause ipage fault\n");  
  itlb_val = SPR_ITLBTR_CI | SPR_ITLBTR_UXE;
  mtspr (SPR_ITLBTR_BASE(ITLB_WAYS - 1) + set, match_space | (ITLB_PR_NOLIMIT & ~SPR_ITLBTR_UXE));
 
  /* Set user mode */
  printf("disabling supervisor mode\n");
  mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_SM);
  printf("calling address 0x%.8lx\n", match_space);
  printf("instruction at jump space: 0x%.8lx\n",REG32(match_space));
  call (match_space);
  ASSERT(ipage_fault_count == 2);
  call (match_space + 8);
  ASSERT(ipage_fault_count == 2);
 
  /* Trigger sys call exception to enable supervisor mode again */
  sys_call ();
 
  /* Disable IMMU */
  immu_disable ();
 
  printf("-------------------------------------------\n");
 
  return 0;
}
 
int main (void)
{
  int i, j;
 
  start_text_addr = (unsigned long)&_stext;
  end_text_addr = (unsigned long)&_endtext;
  end_data_addr = (unsigned long)&_stack;
  end_data_addr += 4;
 
#ifndef TLB_BOTTOM_TEST_PAGE_HARDSET
  /* Set the botom MMU page (and thus TLB set) we'll begin tests at, hopefully 
     avoiding pages with program text, data and stack. Determined by 
     determining page after one top of stack is on. */
  TLB_TEXT_SET_NB =  TLB_DATA_SET_NB = (end_data_addr+PAGE_SIZE) / PAGE_SIZE;
#endif
 
#ifdef _UART_H_
  uart_init(DEFAULT_UART);
#endif
 
  i = j = 0; /* Get rid of warnings */
 
  /* Register bus error handler */
  add_handler(0x2, bus_err_handler);
 
  /* Register illegal insn handler */
  add_handler(0x7, ill_insn_handler);
 
  /* Register sys call handler */
  add_handler(0xc, sys_call_handler);
  // Skip all DTLB tests for now while we tweak itlb ones...
 
#if DO_DMMU_TESTS==1
 
  /* Translation test */
  dtlb_translation_test ();
 
  /* Virtual address match test */
  for (j = 0; j < DTLB_WAYS; j++) {
#ifdef SHORT_TEST
    for (i = TLB_DATA_SET_NB; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
    for (i = TLB_DATA_SET_NB; i < (DTLB_SETS - 1); i++)
#endif
      dtlb_match_test (j, i);
  }
 
  /* Valid bit testing */
 
#ifdef SHORT_TEST
  for (i = TLB_DATA_SET_NB; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
  for (i = TLB_DATA_SET_NB; i < (DTLB_SETS - 1); i++)
#endif
      dtlb_valid_bit_test (i);
 
  /* Permission test */
#ifdef SHORT_TEST
  for (i = TLB_DATA_SET_NB; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
  for (i = TLB_DATA_SET_NB; i < (DTLB_SETS - 1); i++)
#endif
    dtlb_permission_test (i);
 
  /* Data cache test */
 
#ifndef OR1200_NO_DC
#ifdef SHORT_TEST
  for (i = TLB_DATA_SET_NB; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
  for (i = TLB_DATA_SET_NB; i < (DTLB_SETS - 2); i++)
#endif
    dtlb_dcache_test (i);
#endif // ifndef OR1200_NO_DC
 
 
#endif
 
#if DO_IMMU_TESTS==1
 
  /* Translation test */
  itlb_translation_test ();
 
  /* Virtual address match test */
 
  for (j = 0; j < DTLB_WAYS; j++) {
#ifdef SHORT_TEST
  for (i = TLB_DATA_SET_NB + 1; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
  for (i = TLB_DATA_SET_NB + 1; i < (ITLB_SETS - 1); i++)
#endif
      itlb_match_test (j, i);
  }
 
  /* Valid bit testing */
#ifdef SHORT_TEST
  for (i = TLB_DATA_SET_NB; i < (TLB_DATA_SET_NB + SHORT_TEST_NUM - 1); i++)
#else
  for (i = TLB_DATA_SET_NB; i < (ITLB_SETS - 1); i++)
#endif
    itlb_valid_bit_test (i);
 
 
 
  /* Permission test */
#ifdef SHORT_TEST
  for (i = TLB_TEXT_SET_NB; i < (TLB_TEXT_SET_NB + SHORT_TEST_NUM); i++)
#else
  for (i = TLB_TEXT_SET_NB; i < (ITLB_SETS - 1); i++)
#endif
    itlb_permission_test (i);
 
#endif
 
  printf("Tests completed\n");
  report (0xdeaddead);
  report (0x8000000d);
  exit (0);
}