mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
3929fb0a14
Note this is a tree-wide change affecting multiple architectures. At present we use __bss_start, but mostly __bss_end__. This seems inconsistent and in a number of places __bss_end is used instead. Change to use __bss_end for the BSS end symbol throughout U-Boot. This makes it possible to use the asm-generic/sections.h file on all archs. Signed-off-by: Simon Glass <sjg@chromium.org>
536 lines
12 KiB
ArmAsm
536 lines
12 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 <asm-offsets.h>
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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 CONFIG_SYS_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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/*
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* These are defined in the board-specific linker script.
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* Subtracting _start from them lets the linker put their
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* relative position in the executable instead of leaving
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* them null.
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*/
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.globl _bss_start_ofs
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_bss_start_ofs:
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.word __bss_start - _start
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.globl _bss_end_ofs
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_bss_end_ofs:
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.word __bss_end - _start
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.globl _end_ofs
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_end_ofs:
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.word _end - _start
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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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/*
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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 - CONFIG_SYS_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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bl _main
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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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adr r0, _start
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cmp r0, r6
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moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
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beq relocate_done /* skip relocation */
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mov r1, r6 /* r1 <- scratch for copy_loop */
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ldr r3, _bss_start_ofs
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add r2, r0, r3 /* r2 <- source end address */
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copy_loop:
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ldmia r0!, {r9-r10} /* copy from source address [r0] */
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stmia r1!, {r9-r10} /* copy to target address [r1] */
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cmp r0, r2 /* until source end address [r2] */
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blo copy_loop
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#ifndef CONFIG_SPL_BUILD
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/*
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* fix .rel.dyn relocations
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*/
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ldr r0, _TEXT_BASE /* r0 <- Text base */
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sub r9, r6, r0 /* r9 <- relocation offset */
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ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
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add r10, r10, r0 /* r10 <- sym table in FLASH */
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ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
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add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
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ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
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add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
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fixloop:
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ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
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add r0, r0, r9 /* r0 <- location to fix up in RAM */
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ldr r1, [r2, #4]
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and r7, r1, #0xff
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cmp r7, #23 /* relative fixup? */
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beq fixrel
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cmp r7, #2 /* absolute fixup? */
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beq fixabs
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/* ignore unknown type of fixup */
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b fixnext
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fixabs:
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/* absolute fix: set location to (offset) symbol value */
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mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
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add r1, r10, r1 /* r1 <- address of symbol in table */
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ldr r1, [r1, #4] /* r1 <- symbol value */
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add r1, r1, r9 /* r1 <- relocated sym addr */
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b fixnext
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fixrel:
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/* relative fix: increase location by offset */
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ldr r1, [r0]
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add r1, r1, r9
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fixnext:
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str r1, [r0]
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add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
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cmp r2, r3
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blo fixloop
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#endif
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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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relocate_done:
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bx lr
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_rel_dyn_start_ofs:
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.word __rel_dyn_start - _start
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_rel_dyn_end_ofs:
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.word __rel_dyn_end - _start
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_dynsym_start_ofs:
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.word __dynsym_start - _start
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#ifdef CONFIG_ENABLE_MMU
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_mmu_table_base:
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.word mmu_table
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#endif
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.globl c_runtime_cpu_setup
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c_runtime_cpu_setup:
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mov pc, lr
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#ifndef CONFIG_NAND_SPL
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/*
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* we assume that cache operation is done before. (eg. cleanup_before_linux())
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* actually, we don't need to do anything about cache if not use d-cache in
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* U-Boot. So, in this function we clean only MMU. by scsuh
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*
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* void theLastJump(void *kernel, int arch_num, uint boot_params);
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*/
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#ifdef CONFIG_ENABLE_MMU
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.globl theLastJump
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theLastJump:
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mov r9, r0
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ldr r3, =0xfff00000
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ldr r4, _TEXT_PHY_BASE
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adr r5, phy_last_jump
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bic r5, r5, r3
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orr r5, r5, r4
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mov pc, r5
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phy_last_jump:
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/*
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* disable MMU stuff
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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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mcr p15, 0, r0, c1, c0, 0
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mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
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mov r0, #0
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mov pc, r9
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#endif
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/*
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*************************************************************************
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*
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* Interrupt handling
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*
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*************************************************************************
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*/
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@
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@ IRQ stack frame.
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@
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#define S_FRAME_SIZE 72
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#define S_OLD_R0 68
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#define S_PSR 64
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#define S_PC 60
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#define S_LR 56
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#define S_SP 52
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#define S_IP 48
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#define S_FP 44
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#define S_R10 40
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#define S_R9 36
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#define S_R8 32
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#define S_R7 28
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#define S_R6 24
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#define S_R5 20
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#define S_R4 16
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#define S_R3 12
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#define S_R2 8
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#define S_R1 4
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#define S_R0 0
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#define MODE_SVC 0x13
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#define I_BIT 0x80
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/*
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* use bad_save_user_regs for abort/prefetch/undef/swi ...
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*/
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.macro bad_save_user_regs
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/* carve out a frame on current user stack */
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sub sp, sp, #S_FRAME_SIZE
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/* Save user registers (now in svc mode) r0-r12 */
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stmia sp, {r0 - r12}
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ldr r2, IRQ_STACK_START_IN
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/* get values for "aborted" pc and cpsr (into parm regs) */
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ldmia r2, {r2 - r3}
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/* grab pointer to old stack */
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add r0, sp, #S_FRAME_SIZE
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add r5, sp, #S_SP
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mov r1, lr
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/* save sp_SVC, lr_SVC, pc, cpsr */
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stmia r5, {r0 - r3}
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/* save current stack into r0 (param register) */
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mov r0, sp
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.endm
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.macro get_bad_stack
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ldr r13, IRQ_STACK_START_IN @ setup our mode stack
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/* save caller lr in position 0 of saved stack */
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str lr, [r13]
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/* get the spsr */
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mrs lr, spsr
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/* save spsr in position 1 of saved stack */
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str lr, [r13, #4]
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/* prepare SVC-Mode */
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mov r13, #MODE_SVC
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@ msr spsr_c, r13
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/* switch modes, make sure moves will execute */
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msr spsr, r13
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/* capture return pc */
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mov lr, pc
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/* jump to next instruction & switch modes. */
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movs pc, lr
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.endm
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.macro get_bad_stack_swi
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/* space on current stack for scratch reg. */
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sub r13, r13, #4
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/* save R0's value. */
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str r0, [r13]
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ldr r13, IRQ_STACK_START_IN @ setup our mode stack
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/* save caller lr in position 0 of saved stack */
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str lr, [r0]
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/* get the spsr */
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mrs r0, spsr
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/* save spsr in position 1 of saved stack */
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str lr, [r0, #4]
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/* restore r0 */
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ldr r0, [r13]
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/* pop stack entry */
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add r13, r13, #4
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.endm
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/*
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* exception handlers
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*/
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.align 5
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undefined_instruction:
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get_bad_stack
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bad_save_user_regs
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bl do_undefined_instruction
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.align 5
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software_interrupt:
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get_bad_stack_swi
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bad_save_user_regs
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bl do_software_interrupt
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.align 5
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prefetch_abort:
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get_bad_stack
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bad_save_user_regs
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bl do_prefetch_abort
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.align 5
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data_abort:
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get_bad_stack
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bad_save_user_regs
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bl do_data_abort
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.align 5
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not_used:
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get_bad_stack
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bad_save_user_regs
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bl do_not_used
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.align 5
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irq:
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get_bad_stack
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bad_save_user_regs
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bl do_irq
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.align 5
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fiq:
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get_bad_stack
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bad_save_user_regs
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bl do_fiq
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#endif /* CONFIG_NAND_SPL */
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