NetBSD-5.0.2/sys/arch/evbarm/smdk2xx0/smdk2410_start.S
/* $NetBSD: smdk2410_start.S,v 1.5 2005/12/11 12:17:09 christos Exp $ */
/*
* Copyright (c) 2002, 2003 Fujitsu Component Limited
* Copyright (c) 2002, 2003 Genetec Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Fujitsu Component Limited nor the name of
* Genetec corporation may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
* CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
* CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
#include <arm/armreg.h>
#include <arm/arm32/pte.h>
#include <arm/arm32/pmap.h> /* for PMAP_DOMAIN_KERNEL */
#include <arm/s3c2xx0/s3c2410reg.h> /* for S3C2410_SDRAM_START */
#include "opt_smdk2xx0.h" /* SMDK2XX0_CLOCK_CONFIG */
/*
* Kernel start routine for Samsung SMDK2410.
* This code is excuted at the very first after the kernel is loaded
* by boot program.
*/
.text
#ifndef SDRAM_START
#define SDRAM_START S3C2410_SDRAM_START
#endif
#define KERNEL_TEXT_ADDR (SDRAM_START+0x00200000)
.global _C_LABEL(smdk2410_start)
_C_LABEL(smdk2410_start):
/* Disable interrupt */
mrs r0, cpsr
orr r0, r0, #I32_bit
msr cpsr, r0
#ifdef SMDK2XX0_CLOCK_CONFIG
adr r4, clock_config_data
mov r2, #S3C2410_CLKMAN_BASE
ldr r1, [r2, #CLKMAN_CLKSLOW]
orr r0, r1, #CLKSLOW_SLOW
str r0, [r2, #CLKMAN_CLKSLOW]
nop
nop
ldmia r4, {r0,r3}
str r0, [r2, #CLKMAN_CLKDIVN]
str r3, [r2, #CLKMAN_MPLLCON]
nop
nop
str r1, [r2, #CLKMAN_CLKSLOW]
#endif
/* Are we running on right place ? */
adr r0, _C_LABEL(smdk2410_start)
ldr r2, =KERNEL_TEXT_ADDR
cmp r0, r2
beq smdk2410_start_ram
/*
* move me to RAM
*/
ldr r1, Lcopy_size
adr r0, _C_LABEL(smdk2410_start)
add r1, r1, #3
mov r1, r1, LSR #2
mov r4, r2
cmp r0, r2
bhs 5f
/* src < dest. copy from top */
add r0,r0,r1,LSL #2
add r2,r2,r1,LSL #2
3: ldr r3,[r0,#-4]!
str r3,[r2,#-4]!
subs r1,r1,#1
bhi 3b
b 7f
/* src >= dest. copy from bottom */
5: ldr r3,[r0],#4
str r3,[r2],#4
subs r1,r1,#1
bhi 5b
7:
/* Jump to RAM */
ldr r0, Lstart_off
add pc, r4, r0
Lcopy_size: .word _edata-_C_LABEL(smdk2410_start)
Lstart_off: .word smdk2410_start_ram-_C_LABEL(smdk2410_start)
smdk2410_start_ram:
/*
* Kernel is loaded in SDRAM (0x30200000..), and is expected to run
* in VA 0xc0200000..
*/
/* Disable MMU for a while */
mrc p15, 0, r2, c1, c0, 0
bic r2, r2, #CPU_CONTROL_MMU_ENABLE
mcr p15, 0, r2, c1, c0, 0
nop
nop
nop
mov r0,#SDRAM_START /* pagetable */
adr r4, mmu_init_table
b 2f
1:
str r3, [r0, r2]
add r2, r2, #4
add r3, r3, #(L1_S_SIZE)
adds r1, r1, #-1
bhi 1b
2:
ldmia r4!, {r1,r2,r3} /* # of sections, PA|attr, VA */
cmp r1, #0
bne 1b
mcr p15, 0, r0, c2, c0, 0 /* Set TTB */
mcr p15, 0, r0, c8, c7, 0 /* Flush TLB */
/* Set the Domain Access register. Very important! */
mov r0, #((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT)
mcr p15, 0, r0, c3, c0, 0
/* Enable MMU */
mrc p15, 0, r0, c1, c0, 0
orr r0, r0, #CPU_CONTROL_MMU_ENABLE
mcr p15, 0, r0, c1, c0, 0
nop
nop
nop
/* Jump to kernel code in TRUE VA */
adr r0, Lstart
ldr pc, [r0]
Lstart:
.word start
.macro clock_data hdivn, pdivn, mdiv, pdiv, sdiv
.word (\hdivn)<<1 | \pdivn
.word (\mdiv)<<PLLCON_MDIV_SHIFT | (\pdiv)<<PLLCON_PDIV_SHIFT | (\sdiv)<<PLLCON_SDIV_SHIFT
.endm
#ifdef SMDK2XX0_CLOCK_CONFIG
clock_config_data:
clock_data SMDK2XX0_CLOCK_CONFIG
#endif
#define MMU_INIT(va,pa,n_sec,attr) \
.word n_sec ; \
.word 4*((va)>>L1_S_SHIFT) ; \
.word (pa)|(attr) ;
mmu_init_table:
/* fill all table VA==PA */
MMU_INIT(0x00000000, 0x00000000, 1<<(32-L1_S_SHIFT), L1_TYPE_S|L1_S_AP(AP_KRW))
/* map SDRAM VA==PA, WT cacheable */
MMU_INIT(SDRAM_START, SDRAM_START, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
/* map VA 0xc0000000..0xc3ffffff to PA 0x30000000..0x33ffffff */
MMU_INIT(0xc0000000, SDRAM_START, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
.word 0 /* end of table */