359 lines
7.1 KiB
ArmAsm
359 lines
7.1 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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* SPDX-License-Identifier: GPL-2.0+
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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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#ifndef 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_SPL_BUILD
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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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#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_TEXT_BASE)
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.word CONFIG_SPL_TEXT_BASE
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#else
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.word CONFIG_SYS_TEXT_BASE
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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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* 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_SPL_BUILD
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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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.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_SPL_BUILD
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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 lr, 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 lr */
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ldr lr, [r0]
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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_SPL_BUILD */
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