/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. */ #include #include #include #include ENTRY(_start) /* Setup interrupt vector base that matches "__text_start" */ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] ; Disable/enable I-cache according to configuration lr r5, [ARC_BCR_IC_BUILD] breq r5, 0, 1f ; I$ doesn't exist lr r5, [ARC_AUX_IC_CTRL] #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF) bclr r5, r5, 0 ; 0 - Enable, 1 is Disable #else bset r5, r5, 0 ; I$ exists, but is not used #endif sr r5, [ARC_AUX_IC_CTRL] mov r5, 1 sr r5, [ARC_AUX_IC_IVIC] ; As per ARC HS databook (see chapter 5.3.3.2) ; it is required to add 3 NOPs after each write to IC_IVIC. nop nop nop 1: ; Disable/enable D-cache according to configuration lr r5, [ARC_BCR_DC_BUILD] breq r5, 0, 1f ; D$ doesn't exist lr r5, [ARC_AUX_DC_CTRL] bclr r5, r5, 6 ; Invalidate (discard w/o wback) #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) bclr r5, r5, 0 ; Enable (+Inv) #else bset r5, r5, 0 ; Disable (+Inv) #endif sr r5, [ARC_AUX_DC_CTRL] mov r5, 1 sr r5, [ARC_AUX_DC_IVDC] 1: #ifdef CONFIG_ISA_ARCV2 ; Disable System-Level Cache (SLC) lr r5, [ARC_BCR_SLC] breq r5, 0, 1f ; SLC doesn't exist lr r5, [ARC_AUX_SLC_CTRL] bclr r5, r5, 6 ; Invalidate (discard w/o wback) bclr r5, r5, 0 ; Enable (+Inv) sr r5, [ARC_AUX_SLC_CTRL] 1: #endif #ifdef __ARC_UNALIGNED__ /* * Enable handling of unaligned access in the CPU as by default * this HW feature is disabled while GCC starting from 8.1.0 * unconditionally uses it for ARC HS cores. */ flag 1 << STATUS_AD_BIT #endif /* Establish C runtime stack and frame */ mov %sp, CONFIG_SYS_INIT_SP_ADDR mov %fp, %sp /* Allocate reserved area from current top of stack */ mov %r0, %sp bl board_init_f_alloc_reserve /* Set stack below reserved area, adjust frame pointer accordingly */ mov %sp, %r0 mov %fp, %sp /* Initialize reserved area - note: r0 already contains address */ bl board_init_f_init_reserve #ifdef CONFIG_DEBUG_UART /* Earliest point to set up early debug uart */ bl debug_uart_init #endif /* Zero the one and only argument of "board_init_f" */ mov_s %r0, 0 bl board_init_f /* We only get here if relocation is disabled by GD_FLG_SKIP_RELOC */ /* Make sure we don't lose GD overwritten by zero new GD */ mov %r0, %r25 mov %r1, 0 bl board_init_r ENDPROC(_start) /* * void board_init_f_r_trampoline(stack-pointer address) * * This "function" does not return, instead it continues in RAM * after relocating the monitor code. * * r0 = new stack-pointer */ ENTRY(board_init_f_r_trampoline) /* Set up the stack- and frame-pointers */ mov %sp, %r0 mov %fp, %sp /* Update position of intterupt vector table */ lr %r0, [ARC_AUX_INTR_VEC_BASE] ld %r1, [%r25, GD_RELOC_OFF] add %r0, %r0, %r1 sr %r0, [ARC_AUX_INTR_VEC_BASE] /* Re-enter U-Boot by calling board_init_f_r */ j board_init_f_r ENDPROC(board_init_f_r_trampoline)