X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farm1176%2Fstart.S;h=14029246844c44497e4b18e6cd4b888516ddfbc6;hb=9570df03ee37f437f9ba3ddc25c8c6527a396992;hp=6277ae09215d8a0b3bc51dcfee908c3c3c5faa7d;hpb=e1b4c57096b87b4ada56df4154d9acee6a59141f;p=oweals%2Fu-boot.git diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S index 6277ae0921..1402924684 100644 --- a/arch/arm/cpu/arm1176/start.S +++ b/arch/arm/cpu/arm1176/start.S @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ /* * armboot - Startup Code for ARM1176 CPU-core * @@ -6,82 +7,20 @@ * 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 - * * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com) * 2007-09-21 - Added MoviNAND and OneNAND boot codes by * jsgood (jsgood.yang@samsung.com) * Base codes by scsuh (sc.suh) */ +#include #include -#include -#ifdef CONFIG_ENABLE_MMU -#include -#endif +#include -#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 /* ************************************************************************* * @@ -95,70 +34,14 @@ _end_vect: ************************************************************************* */ -.globl _TEXT_BASE -_TEXT_BASE: - .word 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 - -#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) -.globl _armboot_start -_armboot_start: - .word _start -#endif - -/* - * These are defined in the board-specific linker script. - */ -.globl _bss_start -_bss_start: - .word __bss_start - -.globl _bss_end -_bss_end: - .word _end - -#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) -/* IRQ stack memory (calculated at run-time) + 8 bytes */ -.globl IRQ_STACK_START_IN -IRQ_STACK_START_IN: - .word 0x0badc0de - -.globl _datarel_start -_datarel_start: - .word __datarel_start - -.globl _datarelrolocal_start -_datarelrolocal_start: - .word __datarelrolocal_start - -.globl _datarellocal_start -_datarellocal_start: - .word __datarellocal_start - -.globl _datarelro_start -_datarelro_start: - .word __datarelro_start - -.globl _got_start -_got_start: - .word __got_start - -.globl _got_end -_got_end: - .word __got_end - -/* - * the actual reset code - */ + .globl reset reset: + /* Allow the board to save important registers */ + b save_boot_params +.globl save_boot_params_ret +save_boot_params_ret: + /* * set the cpu to SVC32 mode */ @@ -186,7 +69,7 @@ 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 */ @@ -200,12 +83,12 @@ cpu_init_crit: 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, #0x00000002 @ set bit 1 (A) Align orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache /* Prepare to disable the MMU */ adr r2, mmu_disable_phys - sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - TEXT_BASE) + sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - CONFIG_SYS_TEXT_BASE) b mmu_disable .align 5 @@ -217,28 +100,6 @@ mmu_disable: mov pc, r2 mmu_disable_phys: -#ifdef CONFIG_DISABLE_TCM - /* - * Disable the TCMs - */ - mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */ - cmp r0, #0 - beq skip_tcmdisable - mov r1, #0 - mov r2, #1 - tst r0, r2 - mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/ - tst r0, r2, LSL #16 - mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/ -skip_tcmdisable: -#endif -#endif - -#ifdef CONFIG_PERIPORT_REMAP - /* Peri port setup */ - ldr r0, =CONFIG_PERIPORT_BASE - orr r0, r0, #CONFIG_PERIPORT_SIZE - mcr p15,0,r0,c15,c2,4 #endif /* @@ -246,539 +107,15 @@ skip_tcmdisable: */ bl lowlevel_init /* go setup pll,mux,memory */ -/* Set stackpointer in internal RAM to call board_init_f */ -call_board_init_f: - ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) - ldr r0,=0x00000000 - bl board_init_f + bl _main /*------------------------------------------------------------------------------*/ -/* - * 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 */ - mov r7, r2 /* save addr of destination */ - - /* Set up the stack */ -stack_setup: - mov sp, r4 - - adr r0, _start - ldr r2, _TEXT_BASE - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ - cmp r0, r6 - beq clear_bss - -#ifndef CONFIG_SKIP_RELOCATE_UBOOT -copy_loop: - ldmia r0!, {r9-r10} /* copy from source address [r0] */ - stmia r6!, {r9-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - blo copy_loop - -#ifndef CONFIG_PRELOADER - /* fix got entries */ - ldr r1, _TEXT_BASE /* Text base */ - mov r0, r7 /* reloc addr */ - ldr r2, _got_start /* addr in Flash */ - ldr r3, _got_end /* addr in Flash */ - sub r3, r3, r1 - add r3, r3, r0 - sub r2, r2, r1 - add r2, r2, r0 - -fixloop: - ldr r4, [r2] - sub r4, r4, r1 - add r4, r4, r0 - str r4, [r2] - add r2, r2, #4 - cmp r2, r3 - bne fixloop -#endif -#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ - -#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 - -clear_bss: -#ifndef CONFIG_PRELOADER - ldr r0, _bss_start - ldr r1, _bss_end - ldr r3, _TEXT_BASE /* Text base */ - mov r4, r7 /* reloc addr */ - sub r0, r0, r3 - add r0, r0, r4 - sub r1, r1, r3 - add r1, r1, r4 - mov r2, #0x00000000 /* clear */ - -clbss_l:str r2, [r0] /* clear loop... */ - add r0, r0, #4 - cmp r0, r1 - bne clbss_l - - bl coloured_LED_init - bl red_LED_on -#endif + .globl c_runtime_cpu_setup +c_runtime_cpu_setup: -/* - * We are done. Do not return, instead branch to second part of board - * initialization, now running from RAM. - */ -#ifdef CONFIG_NAND_SPL - ldr pc, _nand_boot - -_nand_boot: .word nand_boot -#else - ldr r0, _TEXT_BASE - ldr r2, _board_init_r - sub r2, r2, r0 - add r2, r2, r7 /* position from board_init_r in RAM */ - /* setup parameters for board_init_r */ - mov r0, r5 /* gd_t */ - mov r1, r7 /* dest_addr */ - /* jump to it ... */ - mov lr, r2 mov pc, lr -_board_init_r: .word board_init_r -#endif - -#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ - -/* - * the actual reset code - */ - -reset: - /* - * set the cpu to SVC32 mode - */ - mrs r0, cpsr - bic r0, r0, #0x3f - orr r0, r0, #0xd3 - msr cpsr, r0 - -/* - ************************************************************************* - * - * CPU_init_critical registers - * - * setup important registers - * setup memory timing - * - ************************************************************************* - */ - /* - * we do sys-critical inits only at reboot, - * not when booting from ram! - */ -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 - /* - * flush v4 I/D caches - */ - mov r0, #0 - mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ - mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ - - /* - * disable MMU stuff and caches - */ - 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 - - /* Prepare to disable the MMU */ - adr r2, mmu_disable_phys - sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - TEXT_BASE) - b mmu_disable - - .align 5 - /* Run in a single cache-line */ -mmu_disable: - mcr p15, 0, r0, c1, c0, 0 - nop - nop - mov pc, r2 -mmu_disable_phys: - -#ifdef CONFIG_DISABLE_TCM - /* - * Disable the TCMs - */ - mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */ - cmp r0, #0 - beq skip_tcmdisable - mov r1, #0 - mov r2, #1 - tst r0, r2 - mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/ - tst r0, r2, LSL #16 - mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/ -skip_tcmdisable: -#endif -#endif - -#ifdef CONFIG_PERIPORT_REMAP - /* Peri port setup */ - ldr r0, =CONFIG_PERIPORT_BASE - orr r0, r0, #CONFIG_PERIPORT_SIZE - mcr p15,0,r0,c15,c2,4 -#endif - - /* - * Go setup Memory and board specific bits prior to relocation. - */ - bl lowlevel_init /* go setup pll,mux,memory */ - -#ifndef CONFIG_SKIP_RELOCATE_UBOOT -relocate: /* relocate U-Boot to RAM */ - adr r0, _start /* r0 <- current position of code */ - ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ - cmp r0, r1 /* don't reloc during debug */ - beq stack_setup - - ldr r2, _armboot_start - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ - -copy_loop: - ldmia r0!, {r3-r10} /* copy from source address [r0] */ - stmia r1!, {r3-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - blo copy_loop -#endif /* CONFIG_SKIP_RELOCATE_UBOOT */ - -#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 - - /* 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 - blo 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 */ +WEAK(save_boot_params) + b save_boot_params_ret /* back to my caller */ +ENDPROC(save_boot_params)