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