X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farm1176%2Fstart.S;h=0704bdde27e07b944510f7ac9b3739c63f5fbb83;hb=41623c9;hp=40df4b161428dd3343ba0eb8730908a98bdd1720;hpb=1199c377cf14c240b903e351ab02b3b2cd3800c6;p=karo-tx-uboot.git diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S index 40df4b1614..0704bdde27 100644 --- a/arch/arm/cpu/arm1176/start.S +++ b/arch/arm/cpu/arm1176/start.S @@ -6,23 +6,7 @@ * Copyright (C) 2008 * Guennadi Liakhovetki, DENX Software Engineering, * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA + * SPDX-License-Identifier: GPL-2.0+ * * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com) * 2007-09-21 - Added MoviNAND and OneNAND boot codes by @@ -33,56 +17,11 @@ #include #include #include -#ifdef CONFIG_ENABLE_MMU -#include -#endif -#if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE) +#ifndef CONFIG_SYS_PHY_UBOOT_BASE #define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE #endif -/* - ************************************************************************* - * - * Jump vector table as in table 3.1 in [1] - * - ************************************************************************* - */ - -.globl _start -_start: b reset -#ifndef CONFIG_NAND_SPL - ldr pc, _undefined_instruction - ldr pc, _software_interrupt - ldr pc, _prefetch_abort - ldr pc, _data_abort - ldr pc, _not_used - ldr pc, _irq - ldr pc, _fiq - -_undefined_instruction: - .word undefined_instruction -_software_interrupt: - .word software_interrupt -_prefetch_abort: - .word prefetch_abort -_data_abort: - .word data_abort -_not_used: - .word not_used -_irq: - .word irq -_fiq: - .word fiq -_pad: - .word 0x12345678 /* now 16*4=64 */ -#else - . = _start + 64 -#endif - -.global _end_vect -_end_vect: - .balignl 16,0xdeadbeef /* ************************************************************************* * @@ -96,45 +35,7 @@ _end_vect: ************************************************************************* */ -.globl _TEXT_BASE -_TEXT_BASE: - .word CONFIG_SYS_TEXT_BASE - -/* - * Below variable is very important because we use MMU in U-Boot. - * Without it, we cannot run code correctly before MMU is ON. - * by scsuh. - */ -_TEXT_PHY_BASE: - .word CONFIG_SYS_PHY_UBOOT_BASE - -/* - * These are defined in the board-specific linker script. - * Subtracting _start from them lets the linker put their - * relative position in the executable instead of leaving - * them null. - */ - -.globl _bss_start_ofs -_bss_start_ofs: - .word __bss_start - _start - -.globl _bss_end_ofs -_bss_end_ofs: - .word __bss_end__ - _start - -.globl _end_ofs -_end_ofs: - .word _end - _start - -/* IRQ stack memory (calculated at run-time) + 8 bytes */ -.globl IRQ_STACK_START_IN -IRQ_STACK_START_IN: - .word 0x0badc0de - -/* - * the actual reset code - */ + .globl reset reset: /* @@ -164,7 +65,7 @@ cpu_init_crit: * When booting from NAND - it has definitely been a reset, so, no need * to flush caches and disable the MMU */ -#ifndef CONFIG_NAND_SPL +#ifndef CONFIG_SPL_BUILD /* * flush v4 I/D caches */ @@ -228,309 +129,7 @@ skip_tcmdisable: /*------------------------------------------------------------------------------*/ -/* - * void relocate_code (addr_sp, gd, addr_moni) - * - * This "function" does not return, instead it continues in RAM - * after relocating the monitor code. - * - */ - .globl relocate_code -relocate_code: - mov r4, r0 /* save addr_sp */ - mov r5, r1 /* save addr of gd */ - mov r6, r2 /* save addr of destination */ - - adr r0, _start - cmp r0, r6 - moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */ - beq relocate_done /* skip relocation */ - mov r1, r6 /* r1 <- scratch for copy_loop */ - ldr r3, _bss_start_ofs - add r2, r0, r3 /* r2 <- source end address */ - -copy_loop: - ldmia r0!, {r9-r10} /* copy from source address [r0] */ - stmia r1!, {r9-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - blo copy_loop - -#ifndef CONFIG_SPL_BUILD - /* - * fix .rel.dyn relocations - */ - ldr r0, _TEXT_BASE /* r0 <- Text base */ - sub r9, r6, r0 /* r9 <- relocation offset */ - ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ - add r10, r10, r0 /* r10 <- sym table in FLASH */ - ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ - add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ - ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ - add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ -fixloop: - ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ - add r0, r0, r9 /* r0 <- location to fix up in RAM */ - ldr r1, [r2, #4] - and r7, r1, #0xff - cmp r7, #23 /* relative fixup? */ - beq fixrel - cmp r7, #2 /* absolute fixup? */ - beq fixabs - /* ignore unknown type of fixup */ - b fixnext -fixabs: - /* absolute fix: set location to (offset) symbol value */ - mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ - add r1, r10, r1 /* r1 <- address of symbol in table */ - ldr r1, [r1, #4] /* r1 <- symbol value */ - add r1, r1, r9 /* r1 <- relocated sym addr */ - b fixnext -fixrel: - /* relative fix: increase location by offset */ - ldr r1, [r0] - add r1, r1, r9 -fixnext: - str r1, [r0] - add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ - cmp r2, r3 - blo fixloop -#endif - -#ifdef CONFIG_ENABLE_MMU -enable_mmu: - /* enable domain access */ - ldr r5, =0x0000ffff - mcr p15, 0, r5, c3, c0, 0 /* load domain access register */ - - /* Set the TTB register */ - ldr r0, _mmu_table_base - ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE - ldr r2, =0xfff00000 - bic r0, r0, r2 - orr r1, r0, r1 - mcr p15, 0, r1, c2, c0, 0 - - /* Enable the MMU */ - mrc p15, 0, r0, c1, c0, 0 - orr r0, r0, #1 /* Set CR_M to enable MMU */ - - /* Prepare to enable the MMU */ - adr r1, skip_hw_init - and r1, r1, #0x3fc - 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 - -relocate_done: - - bx lr - -_rel_dyn_start_ofs: - .word __rel_dyn_start - _start -_rel_dyn_end_ofs: - .word __rel_dyn_end - _start -_dynsym_start_ofs: - .word __dynsym_start - _start - -#ifdef CONFIG_ENABLE_MMU -_mmu_table_base: - .word mmu_table -#endif - .globl c_runtime_cpu_setup c_runtime_cpu_setup: mov pc, lr - -#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} - - ldr r2, IRQ_STACK_START_IN - /* 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 - ldr r13, IRQ_STACK_START_IN @ setup our mode stack - - /* 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] - ldr r13, IRQ_STACK_START_IN @ setup our mode stack - /* 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 */