root/arch/arm/boot/compressed/head-xscale.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/arch/arm/boot/compressed/head-xscale.S
   4  *
   5  * XScale specific tweaks.  This is merged into head.S by the linker.
   6  *
   7  */
   8 
   9 #include <linux/linkage.h>
  10 
  11                 .section        ".start", "ax"
  12 
  13 __XScale_start:
  14 
  15                 @ Preserve r8/r7 i.e. kernel entry values
  16 
  17                 @ Data cache might be active.
  18                 @ Be sure to flush kernel binary out of the cache,
  19                 @ whatever state it is, before it is turned off.
  20                 @ This is done by fetching through currently executed
  21                 @ memory to be sure we hit the same cache.
  22                 bic     r2, pc, #0x1f
  23                 add     r3, r2, #0x10000        @ 64 kb is quite enough...
  24 1:              ldr     r0, [r2], #32
  25                 teq     r2, r3
  26                 bne     1b
  27                 mcr     p15, 0, r0, c7, c10, 4  @ drain WB
  28                 mcr     p15, 0, r0, c7, c7, 0   @ flush I & D caches
  29 
  30                 @ disabling MMU and caches
  31                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
  32                 bic     r0, r0, #0x05           @ clear DC, MMU
  33                 bic     r0, r0, #0x1000         @ clear Icache
  34                 mcr     p15, 0, r0, c1, c0, 0
  35