240 lines
8.6 KiB
ArmAsm
240 lines
8.6 KiB
ArmAsm
/* $NetBSD: omap_start.S,v 1.5 2012/09/01 14:46:25 matt Exp $ */
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/*
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* Machine dependent startup code for OMAP boards.
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* Based on lubbock_start.S and tsarm_start.S
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*
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* Copyright (c) 2002, 2003 Genetec Corporation. All rights reserved.
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* Written by Hiroyuki Bessho for Genetec Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of Genetec Corporation may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENETEC CORPORATION
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Copyright (c) 2003
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* Ichiro FUKUHARA <ichiro@ichiro.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 2007 Microsoft
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Microsoft
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "assym.h"
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#include <machine/asm.h>
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#include <arm/armreg.h>
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#include <arm/omap/omap_reg.h>
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/*
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* Kernel start routine for OMAP boards.
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* At this point, this code has been loaded into the very beginning of SDRAM
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* and the MMU is off, which implies the data cache is off.
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*/
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.section .start,"ax",%progbits
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.global _C_LABEL(omap_start)
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_C_LABEL(omap_start):
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/* Move into supervisor mode and disable IRQs/FIQs. */
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mrs r0, cpsr
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bic r0, r0, #PSR_MODE
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orr r0, r0, #(I32_bit | F32_bit | PSR_SVC32_MODE)
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msr cpsr, r0
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/*
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* Set up a preliminary mapping in the MMU to allow us to run
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* at KERNEL_BASE with caches on.
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*/
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/* Build page table from scratch */
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ldr r0, Ltemp_l1_table
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mov r1, r0 /* Save the page table address. */
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/* Zero the entire table so all virtual addresses are invalid. */
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mov r2, #L1_TABLE_SIZE /* in bytes */
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mov r3, #0
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mov r4, r3
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mov r5, r3
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mov r6, r3
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mov r7, r3
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mov r8, r3
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mov r10, r3
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mov r11, r3
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1: stmia r1!, {r3-r8,r10-r11}
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stmia r1!, {r3-r8,r10-r11}
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stmia r1!, {r3-r8,r10-r11}
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stmia r1!, {r3-r8,r10-r11}
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subs r2, r2, #(4 * 4 * 8) /* bytes per loop */
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bne 1b
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/* Now create our entries per the mmu_init_table. */
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l1table .req r0
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va .req r1
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pa .req r2
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n_sec .req r3
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attr .req r4
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itable .req r5
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l1sfrm .req r6
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adr itable, mmu_init_table
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ldr l1sfrm, Ll1_s_frame
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b 3f
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2: str pa, [l1table, va]
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add va, va, #4
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add pa, pa, #(L1_S_SIZE)
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adds n_sec, n_sec, #-1
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bhi 2b
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3: ldmia itable!, {va,pa,n_sec,attr}
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/* Convert va to l1 offset: va = 4 * (va >> L1_S_SHIFT) */
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mov va, va, LSR #L1_S_SHIFT
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mov va, va, LSL #2
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/* Convert pa to l1 entry: pa = (pa & L1_S_FRAME) | attr */
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and pa, pa, l1sfrm
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orr pa, pa, attr
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cmp n_sec, #0
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bne 2b
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.unreq va
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.unreq pa
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.unreq n_sec
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.unreq attr
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.unreq itable
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.unreq l1table
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.unreq l1sfrm
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/*
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* In theory, because the MMU is off, we shouldn't need all of this,
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* but let's not take any chances and do a typical sequence to set
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* the Translation Table Base.
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*/
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mcr p15, 0, r0, c7, c5, 0 /* Invalidate I cache */
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1: mrc p15, 0, r15, c7, c14, 3 /* Test, clean, invalidate D cache. */
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bne 1b
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mcr p15, 0, r0, c7, c10, 4 /* Drain the write buffers. */
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mcr p15, 0, r0, c2, c0, 0 /* Set Translation Table Base */
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mcr p15, 0, r0, c8, c7, 0 /* Invalidate TLBs */
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/* Set the Domain Access register. Very important! */
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mov r0, #((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT)
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mcr p15, 0, r0, c3, c0, 0
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/*
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* Enable the MMU.
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*/
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ldr r0, Lcpsr
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mcr p15, 0, r0, c1, c0, 0
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/*
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* Ensure that the coprocessor has finished turning on the MMU.
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*/
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mrc p15, 0, r0, c2, c0, 0 /* Read an arbitrary value. */
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mov r0, r0 /* Stall until read completes. */
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/*
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* Jump to start in locore.S, which in turn will call initarm and main.
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*/
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ldr pc, Lstart /* Jump to start (flushes pipeline). */
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/* NOTREACHED */
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Lstart:
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.word start
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Ll1_s_frame:
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.word L1_S_FRAME
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Ltemp_l1_table:
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/* Put the temporary L1 translation table at the end of SDRAM. */
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.word KERNEL_BASE_phys + MEMSIZE_BYTES - L1_TABLE_SIZE
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Lcpsr:
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/* What we want to have the CPSR be when we jump to start. */
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.word CPU_CONTROL_MMU_ENABLE | \
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CPU_CONTROL_AFLT_ENABLE | \
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CPU_CONTROL_DC_ENABLE | \
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CPU_CONTROL_WBUF_ENABLE | \
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CPU_CONTROL_32BP_ENABLE | \
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CPU_CONTROL_32BD_ENABLE | \
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CPU_CONTROL_LABT_ENABLE | \
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CPU_CONTROL_SYST_ENABLE | \
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CPU_CONTROL_IC_ENABLE
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/* We'll modify va and pa at run time so we can use relocatable addresses. */
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#define MMU_INIT(va,pa,n_sec,attr) \
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.word va ; \
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.word pa ; \
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.word n_sec ; \
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.word attr ;
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mmu_init_table:
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/* Map SDRAM where we're executing from VA==PA, read-only */
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MMU_INIT(KERNEL_BASE_phys, KERNEL_BASE_phys,
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1,
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L1_S_PROTO | L1_S_AP_KR)
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/* Map KERNEL_BASE VA to SDRAM PA, write-back cacheable */
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MMU_INIT(KERNEL_BASE, KERNEL_BASE_phys,
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(MEMSIZE_BYTES + L1_S_SIZE - 1) / L1_S_SIZE,
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L1_S_PROTO | L1_S_AP_KRW | L1_S_B | L1_S_C)
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/* Map TIPB VA==PA so peripherals will work. */
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MMU_INIT(OMAP_TIPB_PBASE, OMAP_TIPB_PBASE,
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(OMAP_TIPB_SIZE + L1_S_SIZE - 1) / L1_S_SIZE,
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L1_S_PROTO | L1_S_AP_KRW)
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/* end of table */
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MMU_INIT(0, 0, 0, 0)
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