/* $NetBSD: sunxi_start.S,v 1.1.4.2 2017/07/18 19:13:09 snj Exp $ */ /*- * Copyright (c) 2014, 2015 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas of 3am Software Foundry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "opt_soc.h" #include "opt_cpuoptions.h" #include "opt_cputypes.h" #include "opt_multiprocessor.h" #include "opt_arm_debug.h" #include "opt_fdt_arm.h" #include #include #include "assym.h" #include RCSID("$NetBSD: sunxi_start.S,v 1.1.4.2 2017/07/18 19:13:09 snj Exp $") #if defined(VERBOSE_INIT_ARM) && defined(CONSADDR) #define XPUTC(n) mov r0, n; bl xputc #if KERNEL_BASE_VOFFSET == 0 #define XPUTC2(n) mov r0, n; bl xputc #else #define XPUTC2(n) mov r0, n; blx r11 #endif #ifdef __ARMEB__ #define COM_BSWAP #endif #define COM_MULT 4 #define XPUTC_COM 1 #else #define XPUTC(n) #define XPUTC2(n) #endif #define INIT_MEMSIZE 64 #define TEMP_L1_TABLE (KERNEL_BASE - KERNEL_BASE_VOFFSET + INIT_MEMSIZE * L1_S_SIZE - L1_TABLE_SIZE) #define MD_CPU_HATCH _C_LABEL(arm_fdt_cpu_hatch) /* * Kernel start routine for Allwinner sunxi SoCs * At this point, this code has been loaded into SDRAM * and the MMU maybe on or maybe off. */ #ifdef KERNEL_BASES_EQUAL .text #else .section .start,"ax",%progbits #endif .global _C_LABEL(sunxi_start) _C_LABEL(sunxi_start): #ifdef __ARMEB__ setend be /* force big endian */ #endif mov r9, #0 /* Move into supervisor mode and disable IRQs/FIQs. */ cpsid if, #PSR_SVC32_MODE /* * Save any arguments passed to us. */ movw r4, #:lower16:uboot_args movt r4, #:upper16:uboot_args sub r4, r4, #KERNEL_BASE_VOFFSET stmia r4, {r0-r3} // Save the arguments /* Add DTB PA (1MB) from r2 to MMU init table */ movw r3, #:lower16:(L1_S_SIZE - 1) /* align DTB PA to 1M */ movt r3, #:upper16:(L1_S_SIZE - 1) bic r0, r2, r3 orr r0, r0, #1 /* 1MB mapping */ bic r1, r2, r3 movw r3, #:lower16:(L1_S_PROTO_armv7|L1_S_APv7_KRW|L1_S_CACHEABLE) movt r3, #:upper16:(L1_S_PROTO_armv7|L1_S_APv7_KRW|L1_S_CACHEABLE) orr r1, r1, r3 adr r3, .Lmmu_init_table_dtb /* table entry addr */ stmia r3, {r0-r1} /* patch table entry */ /* * Turn on the SMP bit */ bl cortex_init /* * Set up a preliminary mapping in the MMU to allow us to run * at KERNEL_BASE with caches on. */ movw r0, #:lower16:TEMP_L1_TABLE movt r0, #:upper16:TEMP_L1_TABLE movw r1, #:lower16:.Lmmu_init_table movt r1, #:upper16:.Lmmu_init_table bl arm_boot_l1pt_init XPUTC(#'D') /* * Turn on the MMU, Caches, etc. Return to new enabled address space. */ movw r0, #:lower16:TEMP_L1_TABLE movt r0, #:upper16:TEMP_L1_TABLE #if KERNEL_BASE_VOFFSET == 0 bl arm_cpuinit #else /* * After the MMU is on, we can execute in the normal .text segment * so setup the lr to be in .text. Cache the address for xputc * before we go. */ #if defined(VERBOSE_INIT_ARM) adr r11, xputc @ for XPUTC2 #endif movw lr, #:lower16:1f movt lr, #:upper16:1f b arm_cpuinit .pushsection .text,"ax",%progbits 1: #endif XPUTC2(#'Z') /* * Jump to start in locore.S, which in turn will call initarm and main. */ b start /* NOTREACHED */ #ifndef KERNEL_BASES_EQUAL .popsection #endif #include .Lmmu_init_table: MMU_INIT(KERNEL_BASE, KERNEL_BASE - KERNEL_BASE_VOFFSET, INIT_MEMSIZE, L1_S_PROTO_armv7 | L1_S_APv7_KRW | L1_S_CACHEABLE) #if KERNEL_BASE_VOFFSET != 0 /* Map KERNEL_BASE VA to SDRAM PA, write-back cacheable, shareable */ MMU_INIT(KERNEL_BASE - KERNEL_BASE_VOFFSET, KERNEL_BASE - KERNEL_BASE_VOFFSET, INIT_MEMSIZE, L1_S_PROTO_armv7 | L1_S_APv7_KRW | L1_S_CACHEABLE) #endif /* Map CORE */ MMU_INIT(SUNXI_CORE_VBASE, SUNXI_CORE_PBASE, (SUNXI_CORE_SIZE + L1_S_SIZE - 1) / L1_S_SIZE, L1_S_PROTO_armv7 | L1_S_APv7_KRW | L1_S_V6_XN) /* Map CORE */ MMU_INIT(SUNXI_CORE_PBASE, SUNXI_CORE_PBASE, (SUNXI_CORE_SIZE + L1_S_SIZE - 1) / L1_S_SIZE, L1_S_PROTO_armv7 | L1_S_APv7_KRW | L1_S_V6_XN) .Lmmu_init_table_dtb: /* Map DTB from bootloader (patched in later) */ MMU_INIT(0, 0, 0, 0) /* end of table */ MMU_INIT(0, 0, 0, 0) END(_C_LABEL(sunxi_start))