main.c

来自「mpc55**系列芯片的例程 包括SCI,SPI,TIMER,FIT,EDMA」· C语言 代码 · 共 43 行

/* main.c - MMU - create TLB entry example */
/* Description:  Creates a new entry to the TLB table in the MMU */
/* Rev 1.0 Sept 28, 2003 S.Mihalik, Copyright Freescale, 2004. All Rights Reserved */
/* Rev 1.1 July 06, 2007 SM - included header files for MPC551x family */
/* Notes:  */
/* Notes:  */
/*  1. MMU not initialized; must be done by debug scripts or BAM */
/*  2. SRAM not initialized; must be done by debug scripts or in a crt0 type file */

#include "mpc563m.h" /* Use proper include file such as mpc5510.h or mpc5554.h */

asm void MMU_init_TLB6(void) {
  lis    r3, 0x1006       /* Select TLB entry #, define R/W replacment control */
  mtMAS0 r3               /* Load MAS0 with 0x1006 0000 for TLB entry #6 */
  
                          /* Define description context and configuration control: */
                          /* VALID=1, IPROT=0, TID=0, TS=0, TSIZE=1 (4KB size) */
  lis    r3, 0x8000       /* Load MAS 1 with 0x8000 0100 */
  ori    r3, r3, 0x0100
  mtMAS1 r3
  
                          /* Define EPN and page attributes: */
                          /* EPN = 0x4004 0000, WIMAGE = all 0's */
  lis    r3, 0x4004       /* Load MAS2 with 0x4004 0000 */
  mtMAS2 r3
  
                          /* Define RPN and access control for data R/W */
                          /* RPN = 0x4004 0000, U0:3=0, UX/SX=0, UR/SR/UW/SW=1 */
  lis    r3, 0x4004       /* Load MAS3 with 0x4004 000F */
  ori    r3, r3, 0x000F 
  mtMAS3 r3                 
  
  tlbwe                   /* Write entry defined in MAS0 (entry 6 here) to MMU TLB */                        
}

void main (void) {	
  int i = 0;           /* Dummy idle counter */
    
  MMU_init_TLB6();     /* Define 4KB R/W space starting at 0x4004 0000, no translation */
  while (1) { i++; }   /* Loop forever */
}