diff options
Diffstat (limited to 'arch/frv/kernel/head-uc-fr451.S')
| -rw-r--r-- | arch/frv/kernel/head-uc-fr451.S | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/arch/frv/kernel/head-uc-fr451.S b/arch/frv/kernel/head-uc-fr451.S new file mode 100644 index 0000000..31cb54a --- /dev/null +++ b/arch/frv/kernel/head-uc-fr451.S @@ -0,0 +1,174 @@ +/* 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/config.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 + + .section .text.init,"ax" + .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) |
