/* * linux/arch/arm/boot/compressed/head-sa1100.S * * Copyright (C) 1999 Nicolas Pitre <nico@fluxnic.net> * * SA1100 specific tweaks. This is merged into head.S by the linker. * */ #include <linux/linkage.h> #include <asm/mach-types.h> .section ".start", "ax" .arch armv4 __SA1100_start: @ Preserve r8/r7 i.e. kernel entry values #ifdef [31mCONFIG_SA1100_COLLIE[0m mov r7, #MACH_TYPE_COLLIE #endif #ifdef [31mCONFIG_SA1100_SIMPAD[0m @ UNTIL we've something like an open bootldr mov r7, #MACH_TYPE_SIMPAD @should be 87 #endif mrc p15, 0, r0, c1, c0, 0 @ read control reg ands r0, r0, #0x0d beq 99f @ Data cache might be active. @ Be sure to flush kernel binary out of the cache, @ whatever state it is, before it is turned off. @ This is done by fetching through currently executed @ memory to be sure we hit the same cache. bic r2, pc, #0x1f add r3, r2, #0x4000 @ 16 kb is quite enough... 1: ldr r0, [r2], #32 teq r2, r3 bne 1b mcr p15, 0, r0, c7, c10, 4 @ drain WB mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches @ disabling MMU and caches mrc p15, 0, r0, c1, c0, 0 @ read control reg bic r0, r0, #0x0d @ clear WB, DC, MMU bic r0, r0, #0x1000 @ clear Icache mcr p15, 0, r0, c1, c0, 0 99: |