/* head-uc-fr451.S: FR451 uc-linux specific bits of initialisation * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/init.h> #include <linux/threads.h> #include <linux/linkage.h> #include <asm/ptrace.h> #include <asm/page.h> #include <asm/spr-regs.h> #include <asm/mb86943a.h> #include "head.inc" #define __400_DBR0 0xfe000e00 #define __400_DBR1 0xfe000e08 #define __400_DBR2 0xfe000e10 #define __400_DBR3 0xfe000e18 #define __400_DAM0 0xfe000f00 #define __400_DAM1 0xfe000f08 #define __400_DAM2 0xfe000f10 #define __400_DAM3 0xfe000f18 #define __400_LGCR 0xfe000010 #define __400_LCR 0xfe000100 #define __400_LSBR 0xfe000c00 __INIT .balign 4 ############################################################################### # # set the protection map with the I/DAMPR registers # # ENTRY: EXIT: # GR25 SDRAM size [saved] # GR26 &__head_reference [saved] # GR30 LED address [saved] # ############################################################################### .globl __head_fr451_set_protection __head_fr451_set_protection: movsg lr,gr27 movgs gr0,dampr10 movgs gr0,damlr10 movgs gr0,dampr9 movgs gr0,damlr9 movgs gr0,dampr8 movgs gr0,damlr8 # set the I/O region protection registers for FR401/3/5 sethi.p %hi(__region_IO),gr5 setlo %lo(__region_IO),gr5 sethi.p %hi(0x1fffffff),gr7 setlo %lo(0x1fffffff),gr7 ori gr5,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5 movgs gr5,dampr11 ; General I/O tile movgs gr7,damlr11 # need to tile the remaining IAMPR/DAMPR registers to cover as much of the RAM as possible # - start with the highest numbered registers sethi.p %hi(__kernel_image_end),gr8 setlo %lo(__kernel_image_end),gr8 sethi.p %hi(32768),gr4 ; allow for a maximal allocator bitmap setlo %lo(32768),gr4 add gr8,gr4,gr8 sethi.p %hi(1024*2048-1),gr4 ; round up to nearest 2MiB setlo %lo(1024*2048-1),gr4 add.p gr8,gr4,gr8 not gr4,gr4 and gr8,gr4,gr8 sethi.p %hi(__page_offset),gr9 setlo %lo(__page_offset),gr9 add gr9,gr25,gr9 sethi.p %hi(0xffffc000),gr11 setlo %lo(0xffffc000),gr11 # GR8 = base of uncovered RAM # GR9 = top of uncovered RAM # GR11 = xAMLR mask LEDS 0x3317 call __head_split_region movgs gr4,iampr7 movgs gr6,iamlr7 movgs gr5,dampr7 movgs gr7,damlr7 LEDS 0x3316 call __head_split_region movgs gr4,iampr6 movgs gr6,iamlr6 movgs gr5,dampr6 movgs gr7,damlr6 LEDS 0x3315 call __head_split_region movgs gr4,iampr5 movgs gr6,iamlr5 movgs gr5,dampr5 movgs gr7,damlr5 LEDS 0x3314 call __head_split_region movgs gr4,iampr4 movgs gr6,iamlr4 movgs gr5,dampr4 movgs gr7,damlr4 LEDS 0x3313 call __head_split_region movgs gr4,iampr3 movgs gr6,iamlr3 movgs gr5,dampr3 movgs gr7,damlr3 LEDS 0x3312 call __head_split_region movgs gr4,iampr2 movgs gr6,iamlr2 movgs gr5,dampr2 movgs gr7,damlr2 LEDS 0x3311 call __head_split_region movgs gr4,iampr1 movgs gr6,iamlr1 movgs gr5,dampr1 movgs gr7,damlr1 # cover kernel core image with kernel-only segment LEDS 0x3310 sethi.p %hi(__page_offset),gr8 setlo %lo(__page_offset),gr8 call __head_split_region #ifdef CONFIG_PROTECT_KERNEL ori.p gr4,#xAMPRx_S_KERNEL,gr4 ori gr5,#xAMPRx_S_KERNEL,gr5 #endif movgs gr4,iampr0 movgs gr6,iamlr0 movgs gr5,dampr0 movgs gr7,damlr0 # start in TLB context 0 with no page tables movgs gr0,cxnr movgs gr0,ttbr # the FR451 also has an extra trap base register movsg tbr,gr4 movgs gr4,btbr # turn on the timers as appropriate movgs gr0,timerh movgs gr0,timerl movgs gr0,timerd movsg hsr0,gr4 sethi.p %hi(HSR0_ETMI),gr5 setlo %lo(HSR0_ETMI),gr5 or gr4,gr5,gr4 movgs gr4,hsr0 LEDS 0x3300 jmpl @(gr27,gr0)