| /* |
| * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core |
| * |
| * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com> |
| * |
| * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> |
| * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> |
| * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> |
| * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> |
| * Copyright (c) 2003 Kshitij <kshitij@ti.com> |
| * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim@ti.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <version.h> |
| #include <asm/system.h> |
| #include <linux/linkage.h> |
| |
| .globl _start |
| _start: b reset |
| 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 |
| #ifdef CONFIG_SPL_BUILD |
| _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 |
| .globl _undefined_instruction |
| _undefined_instruction: .word undefined_instruction |
| .globl _software_interrupt |
| _software_interrupt: .word software_interrupt |
| .globl _prefetch_abort |
| _prefetch_abort: .word prefetch_abort |
| .globl _data_abort |
| _data_abort: .word data_abort |
| .globl _not_used |
| _not_used: .word not_used |
| .globl _irq |
| _irq: .word irq |
| .globl _fiq |
| _fiq: .word fiq |
| _pad: .word 0x12345678 /* now 16*4=64 */ |
| #endif /* CONFIG_SPL_BUILD */ |
| |
| .global _end_vect |
| _end_vect: |
| |
| .balignl 16,0xdeadbeef |
| /************************************************************************* |
| * |
| * Startup Code (reset vector) |
| * |
| * do important init only if we don't start from memory! |
| * setup Memory and board specific bits prior to relocation. |
| * relocate armboot to ram |
| * setup stack |
| * |
| *************************************************************************/ |
| |
| #ifdef CONFIG_USE_IRQ |
| /* IRQ stack memory (calculated at run-time) */ |
| .globl IRQ_STACK_START |
| IRQ_STACK_START: |
| .word 0x0badc0de |
| |
| /* IRQ stack memory (calculated at run-time) */ |
| .globl FIQ_STACK_START |
| FIQ_STACK_START: |
| .word 0x0badc0de |
| #endif |
| |
| /* IRQ stack memory (calculated at run-time) + 8 bytes */ |
| .globl IRQ_STACK_START_IN |
| IRQ_STACK_START_IN: |
| .word 0x0badc0de |
| |
| /* |
| * the actual reset code |
| */ |
| |
| reset: |
| bl save_boot_params |
| /* |
| * disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode, |
| * except if in HYP mode already |
| */ |
| mrs r0, cpsr |
| and r1, r0, #0x1f @ mask mode bits |
| teq r1, #0x1a @ test for HYP mode |
| bicne r0, r0, #0x1f @ clear all mode bits |
| orrne r0, r0, #0x13 @ set SVC mode |
| orr r0, r0, #0xc0 @ disable FIQ and IRQ |
| msr cpsr,r0 |
| |
| /* |
| * Setup vector: |
| * (OMAP4 spl TEXT_BASE is not 32 byte aligned. |
| * Continue to use ROM code vector only in OMAP4 spl) |
| */ |
| #if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD)) |
| /* Set V=0 in CP15 SCTRL register - for VBAR to point to vector */ |
| mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTRL Register |
| bic r0, #CR_V @ V = 0 |
| mcr p15, 0, r0, c1, c0, 0 @ Write CP15 SCTRL Register |
| |
| /* Set vector address in CP15 VBAR register */ |
| ldr r0, =_start |
| mcr p15, 0, r0, c12, c0, 0 @Set VBAR |
| #endif |
| |
| /* the mask ROM code should have PLL and others stable */ |
| #ifndef CONFIG_SKIP_LOWLEVEL_INIT |
| bl cpu_init_cp15 |
| bl cpu_init_crit |
| #endif |
| |
| bl _main |
| |
| /*------------------------------------------------------------------------------*/ |
| |
| ENTRY(c_runtime_cpu_setup) |
| /* |
| * If I-cache is enabled invalidate it |
| */ |
| #ifndef CONFIG_SYS_ICACHE_OFF |
| mcr p15, 0, r0, c7, c5, 0 @ invalidate icache |
| mcr p15, 0, r0, c7, c10, 4 @ DSB |
| mcr p15, 0, r0, c7, c5, 4 @ ISB |
| #endif |
| /* |
| * Move vector table |
| */ |
| /* Set vector address in CP15 VBAR register */ |
| ldr r0, =_start |
| mcr p15, 0, r0, c12, c0, 0 @Set VBAR |
| |
| bx lr |
| |
| ENDPROC(c_runtime_cpu_setup) |
| |
| /************************************************************************* |
| * |
| * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) |
| * __attribute__((weak)); |
| * |
| * Stack pointer is not yet initialized at this moment |
| * Don't save anything to stack even if compiled with -O0 |
| * |
| *************************************************************************/ |
| ENTRY(save_boot_params) |
| bx lr @ back to my caller |
| ENDPROC(save_boot_params) |
| .weak save_boot_params |
| |
| /************************************************************************* |
| * |
| * cpu_init_cp15 |
| * |
| * Setup CP15 registers (cache, MMU, TLBs). The I-cache is turned on unless |
| * CONFIG_SYS_ICACHE_OFF is defined. |
| * |
| *************************************************************************/ |
| ENTRY(cpu_init_cp15) |
| /* |
| * Invalidate L1 I/D |
| */ |
| mov r0, #0 @ set up for MCR |
| mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs |
| mcr p15, 0, r0, c7, c5, 0 @ invalidate icache |
| mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array |
| mcr p15, 0, r0, c7, c10, 4 @ DSB |
| mcr p15, 0, r0, c7, c5, 4 @ ISB |
| |
| /* |
| * disable MMU stuff and caches |
| */ |
| mrc p15, 0, r0, c1, c0, 0 |
| bic r0, r0, #0x00002000 @ clear bits 13 (--V-) |
| bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM) |
| orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align |
| orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB |
| #ifdef CONFIG_SYS_ICACHE_OFF |
| bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache |
| #else |
| orr r0, r0, #0x00001000 @ set bit 12 (I) I-cache |
| #endif |
| mcr p15, 0, r0, c1, c0, 0 |
| |
| #ifdef CONFIG_ARM_ERRATA_716044 |
| mrc p15, 0, r0, c1, c0, 0 @ read system control register |
| orr r0, r0, #1 << 11 @ set bit #11 |
| mcr p15, 0, r0, c1, c0, 0 @ write system control register |
| #endif |
| |
| #if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072)) |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 4 @ set bit #4 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_743622 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 6 @ set bit #6 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_751472 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 11 @ set bit #11 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| mov pc, lr @ back to my caller |
| ENDPROC(cpu_init_cp15) |
| |
| #ifndef CONFIG_SKIP_LOWLEVEL_INIT |
| /************************************************************************* |
| * |
| * CPU_init_critical registers |
| * |
| * setup important registers |
| * setup memory timing |
| * |
| *************************************************************************/ |
| ENTRY(cpu_init_crit) |
| /* |
| * Jump to board specific initialization... |
| * The Mask ROM will have already initialized |
| * basic memory. Go here to bump up clock rate and handle |
| * wake up conditions. |
| */ |
| b lowlevel_init @ go setup pll,mux,memory |
| ENDPROC(cpu_init_crit) |
| #endif |
| |
| #ifndef CONFIG_SPL_BUILD |
| /* |
| ************************************************************************* |
| * |
| * 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 ... |
| * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling |
| */ |
| |
| .macro bad_save_user_regs |
| sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current |
| @ user stack |
| stmia sp, {r0 - r12} @ Save user registers (now in |
| @ svc mode) r0-r12 |
| ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort |
| @ stack |
| ldmia r2, {r2 - r3} @ get values for "aborted" pc |
| @ and cpsr (into parm regs) |
| add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack |
| |
| add r5, sp, #S_SP |
| mov r1, lr |
| stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr |
| mov r0, sp @ save current stack into r0 |
| @ (param register) |
| .endm |
| |
| .macro irq_save_user_regs |
| sub sp, sp, #S_FRAME_SIZE |
| stmia sp, {r0 - r12} @ Calling r0-r12 |
| add r8, sp, #S_PC @ !! R8 NEEDS to be saved !! |
| @ a reserved stack spot would |
| @ be good. |
| stmdb r8, {sp, lr}^ @ Calling SP, LR |
| str lr, [r8, #0] @ Save calling PC |
| mrs r6, spsr |
| str r6, [r8, #4] @ Save CPSR |
| str r0, [r8, #8] @ Save OLD_R0 |
| mov r0, sp |
| .endm |
| |
| .macro irq_restore_user_regs |
| ldmia sp, {r0 - lr}^ @ Calling r0 - lr |
| mov r0, r0 |
| ldr lr, [sp, #S_PC] @ Get PC |
| add sp, sp, #S_FRAME_SIZE |
| subs pc, lr, #4 @ return & move spsr_svc into |
| @ cpsr |
| .endm |
| |
| .macro get_bad_stack |
| ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter |
| @ in banked mode) |
| |
| str lr, [r13] @ save caller lr in position 0 |
| @ of saved stack |
| mrs lr, spsr @ get the spsr |
| str lr, [r13, #4] @ save spsr in position 1 of |
| @ saved stack |
| |
| mov r13, #MODE_SVC @ prepare SVC-Mode |
| @ msr spsr_c, r13 |
| msr spsr, r13 @ switch modes, make sure |
| @ moves will execute |
| mov lr, pc @ capture return pc |
| movs pc, lr @ jump to next instruction & |
| @ switch modes. |
| .endm |
| |
| .macro get_bad_stack_swi |
| sub r13, r13, #4 @ space on current stack for |
| @ scratch reg. |
| str r0, [r13] @ save R0's value. |
| ldr r0, IRQ_STACK_START_IN @ get data regions start |
| @ spots for abort stack |
| str lr, [r0] @ save caller lr in position 0 |
| @ of saved stack |
| mrs lr, spsr @ get the spsr |
| str lr, [r0, #4] @ save spsr in position 1 of |
| @ saved stack |
| ldr lr, [r0] @ restore lr |
| ldr r0, [r13] @ restore r0 |
| add r13, r13, #4 @ pop stack entry |
| .endm |
| |
| .macro get_irq_stack @ setup IRQ stack |
| ldr sp, IRQ_STACK_START |
| .endm |
| |
| .macro get_fiq_stack @ setup FIQ stack |
| ldr sp, FIQ_STACK_START |
| .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 |
| |
| #ifdef CONFIG_USE_IRQ |
| |
| .align 5 |
| irq: |
| get_irq_stack |
| irq_save_user_regs |
| bl do_irq |
| irq_restore_user_regs |
| |
| .align 5 |
| fiq: |
| get_fiq_stack |
| /* someone ought to write a more effective fiq_save_user_regs */ |
| irq_save_user_regs |
| bl do_fiq |
| irq_restore_user_regs |
| |
| #else |
| |
| .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_USE_IRQ */ |
| #endif /* CONFIG_SPL_BUILD */ |