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/* $NetBSD: locore.S,v 1.14 2003/04/20 16:21:40 thorpej Exp $ */
/*-
* Copyright (C) 1994-1997 Mark Brinicombe
* Copyright (C) 1994 Brini
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of Brini may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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 "assym.s"
#include <sys/syscall.h>
#include <machine/asm.h>
#include <machine/armreg.h>
#include <machine/pte.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/arm/locore.S 218227 2011-02-03 17:35:16Z marcel $");
/* What size should this really be ? It is only used by initarm() */
#define INIT_ARM_STACK_SIZE 2048
/*
* This is for kvm_mkdb, and should be the address of the beginning
* of the kernel text segment (not necessarily the same as kernbase).
*/
#define CPWAIT_BRANCH \
sub pc, pc, #4
#define CPWAIT(tmp) \
mrc p15, 0, tmp, c2, c0, 0 /* arbitrary read of CP15 */ ;\
mov tmp, tmp /* wait for it to complete */ ;\
CPWAIT_BRANCH /* branch to next insn */
.text
.align 0
.globl kernbase
.set kernbase,KERNBASE
.globl physaddr
.set physaddr,PHYSADDR
ENTRY_NP(btext)
/*
* On entry:
* r0 - metadata pointer or 0
* r1 - if (r0 == 0) then metadata pointer
*/
ASENTRY_NP(_start)
/* Move metadata ptr to r12 (ip) */
mov ip, r0
ldr r0, =0
cmp ip, r0
bne 1f
mov ip, r1
1:
/* Make sure interrupts are disabled. */
mrs r7, cpsr
orr r7, r7, #(I32_bit|F32_bit)
msr cpsr_c, r7
#if defined (FLASHADDR) && defined(LOADERRAMADDR)
/* Check if we're running from flash. */
ldr r7, =FLASHADDR
/*
* If we're running with MMU disabled, test against the
* physical address instead.
*/
mrc p15, 0, r2, c1, c0, 0
ands r2, r2, #CPU_CONTROL_MMU_ENABLE
ldreq r8, =PHYSADDR
ldrne r8, =LOADERRAMADDR
cmp r7, r8
bls flash_lower
cmp r7, pc
bhi from_ram
b do_copy
flash_lower:
cmp r8, pc
bls from_ram
do_copy:
ldr r9, =KERNBASE
adr r1, _start
ldr r0, Lreal_start
ldr r2, Lend
sub r2, r2, r0
sub r0, r0, r9
add r0, r0, r8
mov r4, r0
bl memcpy
ldr r0, Lram_offset
add pc, r4, r0
Lram_offset: .word from_ram-_C_LABEL(_start)
from_ram:
nop
#endif
adr r7, Lunmapped
bic r7, r7, #0xf0000000
orr r7, r7, #PHYSADDR
disable_mmu:
/* Disable MMU for a while */
mrc p15, 0, r2, c1, c0, 0
bic r2, r2, #(CPU_CONTROL_MMU_ENABLE | CPU_CONTROL_DC_ENABLE |\
CPU_CONTROL_WBUF_ENABLE)
bic r2, r2, #(CPU_CONTROL_IC_ENABLE)
bic r2, r2, #(CPU_CONTROL_BPRD_ENABLE)
mcr p15, 0, r2, c1, c0, 0
nop
nop
nop
mov pc, r7
Lunmapped:
#ifdef STARTUP_PAGETABLE_ADDR
/* build page table from scratch */
ldr r0, Lstartup_pagetable
adr r4, mmu_init_table
b 3f
2:
str r3, [r0, r2]
add r2, r2, #4
add r3, r3, #(L1_S_SIZE)
adds r1, r1, #-1
bhi 2b
3:
ldmia r4!, {r1,r2,r3} /* # of sections, VA, PA|attr */
cmp r1, #0
adrne r5, 2b
bicne r5, r5, #0xf0000000
orrne r5, r5, #PHYSADDR
movne pc, r5
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
CPWAIT(r0)
#endif
mmu_done:
nop
adr r1, .Lstart
ldmia r1, {r1, r2, sp} /* Set initial stack and */
sub r2, r2, r1 /* get zero init data */
mov r3, #0
.L1:
str r3, [r1], #0x0004 /* get zero init data */
subs r2, r2, #4
bgt .L1
ldr pc, .Lvirt_done
virt_done:
mov r0, ip /* Load argument: metadata ptr */
mov fp, #0 /* trace back starts here */
bl _C_LABEL(initarm) /* Off we go */
/* init arm will return the new stack pointer. */
mov sp, r0
bl _C_LABEL(mi_startup) /* call mi_startup()! */
adr r0, .Lmainreturned
b _C_LABEL(panic)
/* NOTREACHED */
#ifdef STARTUP_PAGETABLE_ADDR
#define MMU_INIT(va,pa,n_sec,attr) \
.word n_sec ; \
.word 4*((va)>>L1_S_SHIFT) ; \
.word (pa)|(attr) ;
Lvirtaddr:
.word KERNVIRTADDR
Lphysaddr:
.word KERNPHYSADDR
Lreal_start:
.word _start
Lend:
.word _edata
Lstartup_pagetable:
.word STARTUP_PAGETABLE_ADDR
mmu_init_table:
/* fill all table VA==PA */
/* map SDRAM VA==PA, WT cacheable */
MMU_INIT(PHYSADDR, PHYSADDR , 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
/* map VA 0xc0000000..0xc3ffffff to PA */
MMU_INIT(KERNBASE, PHYSADDR, 64, L1_TYPE_S|L1_S_C|L1_S_AP(AP_KRW))
.word 0 /* end of table */
#endif
.Lstart:
.word _edata
.word _end
.word svcstk + INIT_ARM_STACK_SIZE
#if defined(FLASHADDR) && defined(LOADERRAMADDR)
.L_arm_memcpy:
.word _C_LABEL(_arm_memcpy)
#endif
.Lvirt_done:
.word virt_done
.Lmainreturned:
.asciz "main() returned"
.align 0
.bss
svcstk:
.space INIT_ARM_STACK_SIZE
.text
.align 0
.Lcpufuncs:
.word _C_LABEL(cpufuncs)
ENTRY_NP(cpu_halt)
mrs r2, cpsr
bic r2, r2, #(PSR_MODE)
orr r2, r2, #(PSR_SVC32_MODE)
orr r2, r2, #(I32_bit | F32_bit)
msr cpsr_all, r2
ldr r4, .Lcpu_reset_address
ldr r4, [r4]
ldr r0, .Lcpufuncs
mov lr, pc
ldr pc, [r0, #CF_IDCACHE_WBINV_ALL]
mov lr, pc
ldr pc, [r0, #CF_L2CACHE_WBINV_ALL]
/*
* Load the cpu_reset_needs_v4_MMU_disable flag to determine if it's
* necessary.
*/
ldr r1, .Lcpu_reset_needs_v4_MMU_disable
ldr r1, [r1]
cmp r1, #0
mov r2, #0
/*
* MMU & IDC off, 32 bit program & data space
* Hurl ourselves into the ROM
*/
mov r0, #(CPU_CONTROL_32BP_ENABLE | CPU_CONTROL_32BD_ENABLE)
mcr 15, 0, r0, c1, c0, 0
mcrne 15, 0, r2, c8, c7, 0 /* nail I+D TLB on ARMv4 and greater */
mov pc, r4
/*
* _cpu_reset_address contains the address to branch to, to complete
* the cpu reset after turning the MMU off
* This variable is provided by the hardware specific code
*/
.Lcpu_reset_address:
.word _C_LABEL(cpu_reset_address)
/*
* cpu_reset_needs_v4_MMU_disable contains a flag that signals if the
* v4 MMU disable instruction needs executing... it is an illegal instruction
* on f.e. ARM6/7 that locks up the computer in an endless illegal
* instruction / data-abort / reset loop.
*/
.Lcpu_reset_needs_v4_MMU_disable:
.word _C_LABEL(cpu_reset_needs_v4_MMU_disable)
/*
* setjump + longjmp
*/
ENTRY(setjmp)
stmia r0, {r4-r14}
mov r0, #0x00000000
RET
ENTRY(longjmp)
ldmia r0, {r4-r14}
mov r0, #0x00000001
RET
.data
.global _C_LABEL(esym)
_C_LABEL(esym): .word _C_LABEL(end)
ENTRY_NP(abort)
b _C_LABEL(abort)
ENTRY_NP(sigcode)
mov r0, sp
swi SYS_sigreturn
/* Well if that failed we better exit quick ! */
swi SYS_exit
b . - 8
.align 0
.global _C_LABEL(esigcode)
_C_LABEL(esigcode):
.data
.global szsigcode
szsigcode:
.long esigcode-sigcode
/* End of locore.S */