arch/powerpc/cpu/ppc4xx/kgdb.S

   1 /*
   2  *  Copyright (C) 2000  Murray Jensen <Murray.Jensen@cmst.csiro.au>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <config.h>
   8 #include <command.h>
   9 #include <asm/ppc4xx.h>
  10 #include <version.h>
  11
  12 #define CONFIG_405GP 1          /* needed for Linux kernel header files */
  13 #define _LINUX_CONFIG_H 1       /* avoid reading Linux autoconf.h file  */
  14
  15 #include <ppc_asm.tmpl>
  16 #include <ppc_defs.h>
  17
  18 #include <asm/cache.h>
  19 #include <asm/mmu.h>
  20
  21 #if defined(CONFIG_CMD_KGDB)
  22  /*
  23  * cache flushing routines for kgdb
  24  */
  25
  26         .globl  kgdb_flush_cache_all
  27 kgdb_flush_cache_all:
  28         /* icache */
  29         iccci   r0,r0           /* iccci invalidates the entire I cache */
  30         /* dcache */
  31         addi    r6,0,0x0000     /* clear GPR 6 */
  32         addi    r7,r0, 128      /* do loop for # of dcache lines */
  33                                 /* NOTE: dccci invalidates both */
  34         mtctr   r7              /* ways in the D cache */
  35 ..dcloop:
  36         dccci   0,r6            /* invalidate line */
  37         addi    r6,r6, 32       /* bump to next line */
  38         bdnz    ..dcloop
  39         blr
  40
  41         .globl  kgdb_flush_cache_range
  42 kgdb_flush_cache_range:
  43         li      r5,L1_CACHE_BYTES-1
  44         andc    r3,r3,r5
  45         subf    r4,r3,r4
  46         add     r4,r4,r5
  47         srwi.   r4,r4,L1_CACHE_SHIFT
  48         beqlr
  49         mtctr   r4
  50         mr      r6,r3
  51 1:      dcbst   0,r3
  52         addi    r3,r3,L1_CACHE_BYTES
  53         bdnz    1b
  54         sync                    /* wait for dcbst's to get to ram */
  55         mtctr   r4
  56 2:      icbi    0,r6
  57         addi    r6,r6,L1_CACHE_BYTES
  58         bdnz    2b
  59         SYNC
  60         blr
  61
  62 #endif