mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-11 13:46:17 +09:00
a51dd67a03
Change the implementation for arm1176 to relocate the code to an arbitrary address in RAM. Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher <hs@denx.de>
785 lines
17 KiB
ArmAsm
785 lines
17 KiB
ArmAsm
/*
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* armboot - Startup Code for ARM1176 CPU-core
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*
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* Copyright (c) 2007 Samsung Electronics
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*
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* Copyright (C) 2008
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* Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com)
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* 2007-09-21 - Added MoviNAND and OneNAND boot codes by
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* jsgood (jsgood.yang@samsung.com)
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* Base codes by scsuh (sc.suh)
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*/
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#include <config.h>
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#include <version.h>
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#ifdef CONFIG_ENABLE_MMU
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#include <asm/proc/domain.h>
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#endif
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#if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE)
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#define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE
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#endif
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/*
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*************************************************************************
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*
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* Jump vector table as in table 3.1 in [1]
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*
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*************************************************************************
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*/
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.globl _start
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_start: b reset
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#ifndef CONFIG_NAND_SPL
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ldr pc, _undefined_instruction
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ldr pc, _software_interrupt
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ldr pc, _prefetch_abort
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ldr pc, _data_abort
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ldr pc, _not_used
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ldr pc, _irq
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ldr pc, _fiq
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_undefined_instruction:
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.word undefined_instruction
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_software_interrupt:
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.word software_interrupt
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_prefetch_abort:
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.word prefetch_abort
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_data_abort:
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.word data_abort
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_not_used:
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.word not_used
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_irq:
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.word irq
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_fiq:
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.word fiq
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_pad:
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.word 0x12345678 /* now 16*4=64 */
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#else
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. = _start + 64
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#endif
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.global _end_vect
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_end_vect:
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.balignl 16,0xdeadbeef
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/*
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*************************************************************************
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*
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* Startup Code (reset vector)
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*
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* do important init only if we don't start from memory!
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* setup Memory and board specific bits prior to relocation.
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* relocate armboot to ram
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* setup stack
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*
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*************************************************************************
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*/
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.globl _TEXT_BASE
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_TEXT_BASE:
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.word TEXT_BASE
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/*
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* Below variable is very important because we use MMU in U-Boot.
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* Without it, we cannot run code correctly before MMU is ON.
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* by scsuh.
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*/
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_TEXT_PHY_BASE:
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.word CONFIG_SYS_PHY_UBOOT_BASE
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#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
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.globl _armboot_start
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_armboot_start:
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.word _start
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#endif
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/*
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* These are defined in the board-specific linker script.
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*/
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.globl _bss_start
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_bss_start:
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.word __bss_start
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.globl _bss_end
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_bss_end:
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.word _end
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#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
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/* IRQ stack memory (calculated at run-time) + 8 bytes */
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.globl IRQ_STACK_START_IN
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IRQ_STACK_START_IN:
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.word 0x0badc0de
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.globl _datarel_start
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_datarel_start:
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.word __datarel_start
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.globl _datarelrolocal_start
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_datarelrolocal_start:
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.word __datarelrolocal_start
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.globl _datarellocal_start
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_datarellocal_start:
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.word __datarellocal_start
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.globl _datarelro_start
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_datarelro_start:
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.word __datarelro_start
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.globl _got_start
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_got_start:
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.word __got_start
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.globl _got_end
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_got_end:
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.word __got_end
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/*
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* the actual reset code
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*/
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reset:
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/*
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* set the cpu to SVC32 mode
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*/
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mrs r0, cpsr
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bic r0, r0, #0x3f
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orr r0, r0, #0xd3
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msr cpsr, r0
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/*
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*************************************************************************
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*
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* CPU_init_critical registers
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*
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* setup important registers
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* setup memory timing
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*
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*************************************************************************
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*/
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/*
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* we do sys-critical inits only at reboot,
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* not when booting from ram!
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*/
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cpu_init_crit:
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/*
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* When booting from NAND - it has definitely been a reset, so, no need
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* to flush caches and disable the MMU
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*/
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#ifndef CONFIG_NAND_SPL
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/*
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* flush v4 I/D caches
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*/
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
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mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
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/*
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* disable MMU stuff and caches
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*/
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
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bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
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orr r0, r0, #0x00000002 @ set bit 2 (A) Align
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orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
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/* Prepare to disable the MMU */
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adr r2, mmu_disable_phys
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sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - TEXT_BASE)
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b mmu_disable
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.align 5
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/* Run in a single cache-line */
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mmu_disable:
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mcr p15, 0, r0, c1, c0, 0
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nop
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nop
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mov pc, r2
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mmu_disable_phys:
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#ifdef CONFIG_DISABLE_TCM
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/*
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* Disable the TCMs
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*/
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mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */
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cmp r0, #0
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beq skip_tcmdisable
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mov r1, #0
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mov r2, #1
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tst r0, r2
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mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/
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tst r0, r2, LSL #16
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mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/
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skip_tcmdisable:
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#endif
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#endif
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#ifdef CONFIG_PERIPORT_REMAP
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/* Peri port setup */
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ldr r0, =CONFIG_PERIPORT_BASE
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orr r0, r0, #CONFIG_PERIPORT_SIZE
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mcr p15,0,r0,c15,c2,4
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#endif
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/*
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* Go setup Memory and board specific bits prior to relocation.
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*/
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bl lowlevel_init /* go setup pll,mux,memory */
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/* Set stackpointer in internal RAM to call board_init_f */
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call_board_init_f:
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ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
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ldr r0,=0x00000000
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bl board_init_f
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/*------------------------------------------------------------------------------*/
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/*
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* void relocate_code (addr_sp, gd, addr_moni)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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*/
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.globl relocate_code
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relocate_code:
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mov r4, r0 /* save addr_sp */
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mov r5, r1 /* save addr of gd */
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mov r6, r2 /* save addr of destination */
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mov r7, r2 /* save addr of destination */
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/* Set up the stack */
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stack_setup:
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mov sp, r4
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adr r0, _start
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ldr r2, _TEXT_BASE
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ldr r3, _bss_start
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sub r2, r3, r2 /* r2 <- size of armboot */
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add r2, r0, r2 /* r2 <- source end address */
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cmp r0, r6
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beq clear_bss
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#ifndef CONFIG_SKIP_RELOCATE_UBOOT
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copy_loop:
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ldmia r0!, {r9-r10} /* copy from source address [r0] */
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stmia r6!, {r9-r10} /* copy to target address [r1] */
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cmp r0, r2 /* until source end addreee [r2] */
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ble copy_loop
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#ifndef CONFIG_PRELOADER
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/* fix got entries */
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ldr r1, _TEXT_BASE /* Text base */
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mov r0, r7 /* reloc addr */
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ldr r2, _got_start /* addr in Flash */
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ldr r3, _got_end /* addr in Flash */
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sub r3, r3, r1
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add r3, r3, r0
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sub r2, r2, r1
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add r2, r2, r0
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fixloop:
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ldr r4, [r2]
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sub r4, r4, r1
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add r4, r4, r0
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str r4, [r2]
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add r2, r2, #4
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cmp r2, r3
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bne fixloop
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#endif
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#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
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#ifdef CONFIG_ENABLE_MMU
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enable_mmu:
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/* enable domain access */
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ldr r5, =0x0000ffff
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mcr p15, 0, r5, c3, c0, 0 /* load domain access register */
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/* Set the TTB register */
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ldr r0, _mmu_table_base
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ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE
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ldr r2, =0xfff00000
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bic r0, r0, r2
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orr r1, r0, r1
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mcr p15, 0, r1, c2, c0, 0
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/* Enable the MMU */
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mrc p15, 0, r0, c1, c0, 0
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orr r0, r0, #1 /* Set CR_M to enable MMU */
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/* Prepare to enable the MMU */
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adr r1, skip_hw_init
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and r1, r1, #0x3fc
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ldr r2, _TEXT_BASE
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ldr r3, =0xfff00000
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and r2, r2, r3
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orr r2, r2, r1
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b mmu_enable
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.align 5
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/* Run in a single cache-line */
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mmu_enable:
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mcr p15, 0, r0, c1, c0, 0
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nop
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nop
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mov pc, r2
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skip_hw_init:
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#endif
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clear_bss:
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#ifndef CONFIG_PRELOADER
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ldr r0, _bss_start
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ldr r1, _bss_end
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ldr r3, _TEXT_BASE /* Text base */
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mov r4, r7 /* reloc addr */
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sub r0, r0, r3
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add r0, r0, r4
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sub r1, r1, r3
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add r1, r1, r4
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mov r2, #0x00000000 /* clear */
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clbss_l:str r2, [r0] /* clear loop... */
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add r0, r0, #4
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cmp r0, r1
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bne clbss_l
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bl coloured_LED_init
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bl red_LED_on
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#endif
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/*
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* We are done. Do not return, instead branch to second part of board
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* initialization, now running from RAM.
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*/
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#ifdef CONFIG_NAND_SPL
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ldr pc, _nand_boot
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_nand_boot: .word nand_boot
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#else
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ldr r0, _TEXT_BASE
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ldr r2, _board_init_r
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sub r2, r2, r0
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add r2, r2, r7 /* position from board_init_r in RAM */
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/* setup parameters for board_init_r */
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mov r0, r5 /* gd_t */
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mov r1, r7 /* dest_addr */
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/* jump to it ... */
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mov lr, r2
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mov pc, lr
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_board_init_r: .word board_init_r
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#endif
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#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
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/*
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* the actual reset code
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*/
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reset:
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/*
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* set the cpu to SVC32 mode
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*/
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mrs r0, cpsr
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bic r0, r0, #0x3f
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orr r0, r0, #0xd3
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msr cpsr, r0
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/*
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*************************************************************************
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*
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* CPU_init_critical registers
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*
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* setup important registers
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* setup memory timing
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*
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*************************************************************************
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*/
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/*
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* we do sys-critical inits only at reboot,
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* not when booting from ram!
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*/
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cpu_init_crit:
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/*
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* When booting from NAND - it has definitely been a reset, so, no need
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* to flush caches and disable the MMU
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*/
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#ifndef CONFIG_NAND_SPL
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/*
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* flush v4 I/D caches
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*/
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
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mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
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/*
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* disable MMU stuff and caches
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*/
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
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bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
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orr r0, r0, #0x00000002 @ set bit 2 (A) Align
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orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
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/* Prepare to disable the MMU */
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adr r2, mmu_disable_phys
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sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - TEXT_BASE)
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b mmu_disable
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.align 5
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/* Run in a single cache-line */
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mmu_disable:
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mcr p15, 0, r0, c1, c0, 0
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nop
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nop
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mov pc, r2
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mmu_disable_phys:
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#ifdef CONFIG_DISABLE_TCM
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/*
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* Disable the TCMs
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*/
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mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */
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cmp r0, #0
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beq skip_tcmdisable
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mov r1, #0
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mov r2, #1
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tst r0, r2
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mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/
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tst r0, r2, LSL #16
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mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/
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skip_tcmdisable:
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#endif
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#endif
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#ifdef CONFIG_PERIPORT_REMAP
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/* Peri port setup */
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ldr r0, =CONFIG_PERIPORT_BASE
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orr r0, r0, #CONFIG_PERIPORT_SIZE
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mcr p15,0,r0,c15,c2,4
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#endif
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/*
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* Go setup Memory and board specific bits prior to relocation.
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*/
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bl lowlevel_init /* go setup pll,mux,memory */
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#ifndef CONFIG_SKIP_RELOCATE_UBOOT
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relocate: /* relocate U-Boot to RAM */
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adr r0, _start /* r0 <- current position of code */
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ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
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cmp r0, r1 /* don't reloc during debug */
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beq stack_setup
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ldr r2, _armboot_start
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ldr r3, _bss_start
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sub r2, r3, r2 /* r2 <- size of armboot */
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add r2, r0, r2 /* r2 <- source end address */
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copy_loop:
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ldmia r0!, {r3-r10} /* copy from source address [r0] */
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stmia r1!, {r3-r10} /* copy to target address [r1] */
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cmp r0, r2 /* until source end addreee [r2] */
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ble copy_loop
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#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
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#ifdef CONFIG_ENABLE_MMU
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enable_mmu:
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/* enable domain access */
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ldr r5, =0x0000ffff
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mcr p15, 0, r5, c3, c0, 0 /* load domain access register */
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/* Set the TTB register */
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ldr r0, _mmu_table_base
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ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE
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ldr r2, =0xfff00000
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bic r0, r0, r2
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orr r1, r0, r1
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mcr p15, 0, r1, c2, c0, 0
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/* Enable the MMU */
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mrc p15, 0, r0, c1, c0, 0
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orr r0, r0, #1 /* Set CR_M to enable MMU */
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/* Prepare to enable the MMU */
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adr r1, skip_hw_init
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and r1, r1, #0x3fc
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|
ldr r2, _TEXT_BASE
|
|
ldr r3, =0xfff00000
|
|
and r2, r2, r3
|
|
orr r2, r2, r1
|
|
b mmu_enable
|
|
|
|
.align 5
|
|
/* Run in a single cache-line */
|
|
mmu_enable:
|
|
|
|
mcr p15, 0, r0, c1, c0, 0
|
|
nop
|
|
nop
|
|
mov pc, r2
|
|
skip_hw_init:
|
|
#endif
|
|
|
|
/* Set up the stack */
|
|
stack_setup:
|
|
ldr r0, =CONFIG_SYS_UBOOT_BASE /* base of copy in DRAM */
|
|
sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
|
|
sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
|
|
sub sp, r0, #12 /* leave 3 words for abort-stack */
|
|
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
|
|
|
|
clear_bss:
|
|
ldr r0, _bss_start /* find start of bss segment */
|
|
ldr r1, _bss_end /* stop here */
|
|
mov r2, #0 /* clear */
|
|
|
|
clbss_l:
|
|
str r2, [r0] /* clear loop... */
|
|
add r0, r0, #4
|
|
cmp r0, r1
|
|
ble clbss_l
|
|
|
|
#ifndef CONFIG_NAND_SPL
|
|
ldr pc, _start_armboot
|
|
|
|
_start_armboot:
|
|
.word start_armboot
|
|
#else
|
|
b nand_boot
|
|
/* .word nand_boot*/
|
|
#endif
|
|
|
|
#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
|
|
|
|
#ifdef CONFIG_ENABLE_MMU
|
|
_mmu_table_base:
|
|
.word mmu_table
|
|
#endif
|
|
|
|
#ifndef CONFIG_NAND_SPL
|
|
/*
|
|
* we assume that cache operation is done before. (eg. cleanup_before_linux())
|
|
* actually, we don't need to do anything about cache if not use d-cache in
|
|
* U-Boot. So, in this function we clean only MMU. by scsuh
|
|
*
|
|
* void theLastJump(void *kernel, int arch_num, uint boot_params);
|
|
*/
|
|
#ifdef CONFIG_ENABLE_MMU
|
|
.globl theLastJump
|
|
theLastJump:
|
|
mov r9, r0
|
|
ldr r3, =0xfff00000
|
|
ldr r4, _TEXT_PHY_BASE
|
|
adr r5, phy_last_jump
|
|
bic r5, r5, r3
|
|
orr r5, r5, r4
|
|
mov pc, r5
|
|
phy_last_jump:
|
|
/*
|
|
* disable MMU stuff
|
|
*/
|
|
mrc p15, 0, r0, c1, c0, 0
|
|
bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
|
|
bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
|
|
orr r0, r0, #0x00000002 /* set bit 2 (A) Align */
|
|
orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
|
|
mcr p15, 0, r0, c1, c0, 0
|
|
|
|
mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
|
|
|
|
mov r0, #0
|
|
mov pc, r9
|
|
#endif
|
|
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Interrupt handling
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
@
|
|
@ IRQ stack frame.
|
|
@
|
|
#define S_FRAME_SIZE 72
|
|
|
|
#define S_OLD_R0 68
|
|
#define S_PSR 64
|
|
#define S_PC 60
|
|
#define S_LR 56
|
|
#define S_SP 52
|
|
|
|
#define S_IP 48
|
|
#define S_FP 44
|
|
#define S_R10 40
|
|
#define S_R9 36
|
|
#define S_R8 32
|
|
#define S_R7 28
|
|
#define S_R6 24
|
|
#define S_R5 20
|
|
#define S_R4 16
|
|
#define S_R3 12
|
|
#define S_R2 8
|
|
#define S_R1 4
|
|
#define S_R0 0
|
|
|
|
#define MODE_SVC 0x13
|
|
#define I_BIT 0x80
|
|
|
|
/*
|
|
* use bad_save_user_regs for abort/prefetch/undef/swi ...
|
|
*/
|
|
|
|
.macro bad_save_user_regs
|
|
/* carve out a frame on current user stack */
|
|
sub sp, sp, #S_FRAME_SIZE
|
|
/* Save user registers (now in svc mode) r0-r12 */
|
|
stmia sp, {r0 - r12}
|
|
|
|
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
|
|
ldr r2, _armboot_start
|
|
sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
|
|
/* set base 2 words into abort stack */
|
|
sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8)
|
|
#else
|
|
ldr r2, IRQ_STACK_START_IN
|
|
#endif
|
|
/* get values for "aborted" pc and cpsr (into parm regs) */
|
|
ldmia r2, {r2 - r3}
|
|
/* grab pointer to old stack */
|
|
add r0, sp, #S_FRAME_SIZE
|
|
|
|
add r5, sp, #S_SP
|
|
mov r1, lr
|
|
/* save sp_SVC, lr_SVC, pc, cpsr */
|
|
stmia r5, {r0 - r3}
|
|
/* save current stack into r0 (param register) */
|
|
mov r0, sp
|
|
.endm
|
|
|
|
.macro get_bad_stack
|
|
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
|
|
/* setup our mode stack (enter in banked mode) */
|
|
ldr r13, _armboot_start
|
|
/* move past malloc pool */
|
|
sub r13, r13, #(CONFIG_SYS_MALLOC_LEN)
|
|
/* move to reserved a couple spots for abort stack */
|
|
sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE + 8)
|
|
#else
|
|
ldr r13, IRQ_STACK_START_IN @ setup our mode stack
|
|
#endif
|
|
|
|
/* save caller lr in position 0 of saved stack */
|
|
str lr, [r13]
|
|
/* get the spsr */
|
|
mrs lr, spsr
|
|
/* save spsr in position 1 of saved stack */
|
|
str lr, [r13, #4]
|
|
|
|
/* prepare SVC-Mode */
|
|
mov r13, #MODE_SVC
|
|
@ msr spsr_c, r13
|
|
/* switch modes, make sure moves will execute */
|
|
msr spsr, r13
|
|
/* capture return pc */
|
|
mov lr, pc
|
|
/* jump to next instruction & switch modes. */
|
|
movs pc, lr
|
|
.endm
|
|
|
|
.macro get_bad_stack_swi
|
|
/* space on current stack for scratch reg. */
|
|
sub r13, r13, #4
|
|
/* save R0's value. */
|
|
str r0, [r13]
|
|
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
|
|
/* get data regions start */
|
|
ldr r0, _armboot_start
|
|
/* move past malloc pool */
|
|
sub r0, r0, #(CONFIG_SYS_MALLOC_LEN)
|
|
/* move past gbl and a couple spots for abort stack */
|
|
sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE + 8)
|
|
#else
|
|
ldr r13, IRQ_STACK_START_IN @ setup our mode stack
|
|
#endif
|
|
/* save caller lr in position 0 of saved stack */
|
|
str lr, [r0]
|
|
/* get the spsr */
|
|
mrs r0, spsr
|
|
/* save spsr in position 1 of saved stack */
|
|
str lr, [r0, #4]
|
|
/* restore r0 */
|
|
ldr r0, [r13]
|
|
/* pop stack entry */
|
|
add r13, r13, #4
|
|
.endm
|
|
|
|
/*
|
|
* exception handlers
|
|
*/
|
|
.align 5
|
|
undefined_instruction:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_undefined_instruction
|
|
|
|
.align 5
|
|
software_interrupt:
|
|
get_bad_stack_swi
|
|
bad_save_user_regs
|
|
bl do_software_interrupt
|
|
|
|
.align 5
|
|
prefetch_abort:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_prefetch_abort
|
|
|
|
.align 5
|
|
data_abort:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_data_abort
|
|
|
|
.align 5
|
|
not_used:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_not_used
|
|
|
|
.align 5
|
|
irq:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_irq
|
|
|
|
.align 5
|
|
fiq:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_fiq
|
|
#endif /* CONFIG_NAND_SPL */
|