/* $NetBSD: gumstix_start.S,v 1.16 2019/05/18 08:49:24 skrll Exp $ */ /* * Copyright (C) 2005, 2006 WIDE Project and SOUM Corporation. * All rights reserved. * * Written by Takashi Kiyohara and Susumu Miki for WIDE Project and SOUM * Corporation. * * 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. * 3. Neither the name of the project nor the name of SOUM Corporation * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT and SOUM CORPORATION ``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 PROJECT AND SOUM CORPORATION * 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. */ /* * Copyright (c) 2002, 2003 Genetec Corporation. All rights reserved. * Written by Hiroyuki Bessho for Genetec Corporation. * * 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. * 3. The name of Genetec Corporation may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``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 GENETEC CORPORATION * 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_cputypes.h" #include "opt_gumstix.h" #include "opt_multiprocessor.h" #include <machine/asm.h> #include <arm/armreg.h> #include "assym.h" RCSID("$NetBSD: gumstix_start.S,v 1.16 2019/05/18 08:49:24 skrll Exp $") /* * CPWAIT -- Canonical method to wait for CP15 update. * NOTE: Clobbers the specified temp reg. * copied from arm/arm/cpufunc_asm_xscale.S * XXX: better be in a common header file. */ #if defined(CPU_XSCALE) #define CPWAIT_BRANCH \ sub pc, pc, #4 #else #define CPWAIT_BRANCH #endif #define CPWAIT(tmp) \ mrc p15, 0, tmp, c2, c0, 0 /* arbitrary read of CP15 */ ; \ mov tmp, tmp /* wait for it to complete */ ; \ CPWAIT_BRANCH /* branch to next insn */ /* * Kernel start routine for GUMSTIX * this code is excuted at the very first after the kernel is loaded * by U-Boot. */ .text .global _C_LABEL(gumstix_start) _C_LABEL(gumstix_start): /* * gumstix's loader is U-boot. it's running on RAM */ /* Our page table might be cached. Disable D-cache beforehand. */ mrc p15, 0, ip, c1, c0, 0 bic ip, ip, #CPU_CONTROL_DC_ENABLE mcr p15, 0, ip, c1, c0, 0 /* * Kernel is loaded in SDRAM (0xa0200000..), and is expected to run * in VA 0xc0200000.. */ /* save u-boot's args */ adr ip, uboot_args nop nop nop stmia ip!, {r0, r1, r2, r3} nop nop nop /* Calculate RAM size, like vendor's u-boot. */ adr ip, ram_size ldr r0, [ip] mrc p15, 0, r1, c0, c0, 0 and r1, r1, #CPU_ID_XSCALE_COREGEN_MASK cmp r1, #0x4000 bne 3f /* goto 3f, if basix or connex */ 0: /* check memory size, if verdex or verdex-pro */ add r3, ip, r0 ldr r1, [r3] cmp r0, r1 beq 2f 1: add r0, r0, r0 /* r0 <<= 1 */ str r0, [ip] b 0b 2: mvn r1, r1 /* r1 ^= 0xffffffff */ str r1, [r3] ldr r2, [ip] cmp r1, r2 beq 3f str r0, [r3] /* restore */ b 1b 3: str r0, [ip] /* Build page table from scratch */ ldr r0, Lstartup_pagetable /* pagetable */ adr ip, mmu_init_table b 5f 4: str r3, [r0, r2, lsl #2] add r2, r2, #1 add r3, r3, #(L1_S_SIZE) adds r1, r1, #-1 bhi 4b 5: ldmia ip!, {r1, r2, r3} /* # of sections, PA|attr, VA */ lsr r2, r2, #L1_S_SHIFT cmp r1, #0 bne 4b mov r1, r0 mcr p15, 0, r1, c2, c0, 0 /* Set TTB */ mcr p15, 0, r1, c8, c7, 0 /* Flush TLB */ /* * Set the Domain Access register. Very important! * startup_pagetable puts to domain 0 now. */ #define KERNEL_DOMAIN(x) ((x) << (PMAP_DOMAIN_KERNEL << 1)) mov r1, #(KERNEL_DOMAIN(DOMAIN_CLIENT) | DOMAIN_CLIENT) mcr p15, 0, r1, c3, c0, 0 /* Enable MMU and etc. */ mrc p15, 0, r1, c1, c0, 0 #if defined(CPU_XSCALE_PXA250) || defined(CPU_XSCALE_PXA270) orr r1, r1, #CPU_CONTROL_SYST_ENABLE #endif orr r1, r1, #CPU_CONTROL_MMU_ENABLE mcr p15, 0, r1, c1, c0, 0 /* * Ensure that the coprocessor has finished turning on the MMU. */ CPWAIT(r3) /* Jump to kernel code in TRUE VA */ ldr r0, Lstart bx r0 Lstart: .word start .globl _C_LABEL(uboot_args) uboot_args: .space 16 /* r0, r1, r2, r3 */ .globl _C_LABEL(ram_size) ram_size: .word 0x04000000 /* 64Mbyte */ #ifndef STARTUP_PAGETABLE_ADDR #define STARTUP_PAGETABLE_ADDR 0xa0000000 /* aligned 16kByte */ #endif Lstartup_pagetable: .word STARTUP_PAGETABLE_ADDR #define MMU_INIT(va, pa, n_sec, attr) \ .word n_sec ; \ .word (va) ; \ .word (pa) | (attr) ; mmu_init_table: /* fill all table VA==PA */ MMU_INIT(0x00000000, 0x00000000, 1 << (32 - L1_S_SHIFT), L1_S_PROTO | L1_S_AP_KRW) #define SDRAM_START 0xa0000000 /* map SDRAM VA==PA, write-back cacheable (first 64M only)*/ MMU_INIT(SDRAM_START, SDRAM_START, 64, L1_S_PROTO | L1_S_C | L1_S_AP_KRW) /* map VA 0xc0000000..0xc3ffffff to PA 0xa0000000..0xa3ffffff */ MMU_INIT(0xc0000000, SDRAM_START, 64, L1_S_PROTO | L1_S_C | L1_S_AP_KRW) MMU_INIT(0, 0, 0, 0) /* end of table */ #undef MMU_INIT
