/*
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* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
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* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
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* Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
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* Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <mpc83xx.h>
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#include <version.h>
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#define CONFIG_83XX 1 /* needed for Linux kernel header files*/
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#include <ppc_asm.tmpl>
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#include <ppc_defs.h>
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#include <asm/cache.h>
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#include <asm/mmu.h>
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#include <asm/u-boot.h>
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/* We don't want the MMU yet.
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*/
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#undef MSR_KERNEL
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/*
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* Floating Point enable, Machine Check and Recoverable Interr.
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*/
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#ifdef DEBUG
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#define MSR_KERNEL (MSR_FP|MSR_RI)
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#else
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#define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
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#endif
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#if defined(CONFIG_NAND_SPL) || \
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(defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL))
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#define MINIMAL_SPL
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#endif
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#if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
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!defined(CONFIG_SYS_RAMBOOT)
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#define CONFIG_SYS_FLASHBOOT
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#endif
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/*
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* Set up GOT: Global Offset Table
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*
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* Use r12 to access the GOT
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*/
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START_GOT
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GOT_ENTRY(_GOT2_TABLE_)
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GOT_ENTRY(__bss_start)
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GOT_ENTRY(__bss_end)
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#ifndef MINIMAL_SPL
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GOT_ENTRY(_FIXUP_TABLE_)
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GOT_ENTRY(_start)
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GOT_ENTRY(_start_of_vectors)
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GOT_ENTRY(_end_of_vectors)
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GOT_ENTRY(transfer_to_handler)
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#endif
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END_GOT
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/*
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* The Hard Reset Configuration Word (HRCW) table is in the first 64
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* (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
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* times so the processor can fetch it out of flash whether the flash
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* is 8, 16, 32, or 64 bits wide (hardware trickery).
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*/
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.text
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#define _HRCW_TABLE_ENTRY(w) \
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.fill 8,1,(((w)>>24)&0xff); \
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.fill 8,1,(((w)>>16)&0xff); \
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.fill 8,1,(((w)>> 8)&0xff); \
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.fill 8,1,(((w) )&0xff)
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_HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_LOW)
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_HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH)
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/*
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* Magic number and version string - put it after the HRCW since it
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* cannot be first in flash like it is in many other processors.
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*/
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.long 0x27051956 /* U-Boot Magic Number */
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.globl version_string
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version_string:
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.ascii U_BOOT_VERSION_STRING, "\0"
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.align 2
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.globl enable_addr_trans
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enable_addr_trans:
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/* enable address translation */
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mfmsr r5
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ori r5, r5, (MSR_IR | MSR_DR)
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mtmsr r5
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isync
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blr
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.globl disable_addr_trans
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disable_addr_trans:
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/* disable address translation */
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mflr r4
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mfmsr r3
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andi. r0, r3, (MSR_IR | MSR_DR)
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beqlr
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andc r3, r3, r0
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mtspr SRR0, r4
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mtspr SRR1, r3
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rfi
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.globl ppcDWstore
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ppcDWstore:
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lfd 1, 0(r4)
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stfd 1, 0(r3)
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blr
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.globl ppcDWload
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ppcDWload:
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lfd 1, 0(r3)
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stfd 1, 0(r4)
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blr
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#ifndef CONFIG_DEFAULT_IMMR
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#error CONFIG_DEFAULT_IMMR must be defined
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#endif /* CONFIG_DEFAULT_IMMR */
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#ifndef CONFIG_SYS_IMMR
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#define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR
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#endif /* CONFIG_SYS_IMMR */
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/*
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* After configuration, a system reset exception is executed using the
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* vector at offset 0x100 relative to the base set by MSR[IP]. If
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* MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
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* base address is 0xfff00000. In the case of a Power On Reset or Hard
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* Reset, the value of MSR[IP] is determined by the CIP field in the
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* HRCW.
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*
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* Other bits in the HRCW set up the Base Address and Port Size in BR0.
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* This determines the location of the boot ROM (flash or EPROM) in the
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* processor's address space at boot time. As long as the HRCW is set up
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* so that we eventually end up executing the code below when the
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* processor executes the reset exception, the actual values used should
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* not matter.
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*
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* Once we have got here, the address mask in OR0 is cleared so that the
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* bottom 32K of the boot ROM is effectively repeated all throughout the
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* processor's address space, after which we can jump to the absolute
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* address at which the boot ROM was linked at compile time, and proceed
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* to initialise the memory controller without worrying if the rug will
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* be pulled out from under us, so to speak (it will be fine as long as
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* we configure BR0 with the same boot ROM link address).
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*/
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. = EXC_OFF_SYS_RESET
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.globl _start
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_start: /* time t 0 */
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lis r4, CONFIG_DEFAULT_IMMR@h
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nop
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mfmsr r5 /* save msr contents */
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/* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
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bl 1f
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1: mflr r7
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lis r3, CONFIG_SYS_IMMR@h
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ori r3, r3, CONFIG_SYS_IMMR@l
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lwz r6, IMMRBAR(r4)
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isync
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stw r3, IMMRBAR(r4)
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lwz r6, 0(r7) /* Arbitrary external load */
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isync
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lwz r6, IMMRBAR(r3)
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isync
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/* Initialise the E300 processor core */
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/*------------------------------------------*/
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#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
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defined(CONFIG_NAND_SPL)
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/* The FCM begins execution after only the first page
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* is loaded. Wait for the rest before branching
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* to another flash page.
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*/
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1: lwz r6, 0x50b0(r3)
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andi. r6, r6, 1
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beq 1b
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#endif
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bl init_e300_core
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#ifdef CONFIG_SYS_FLASHBOOT
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/* Inflate flash location so it appears everywhere, calculate */
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/* the absolute address in final location of the FLASH, jump */
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/* there and deflate the flash size back to minimal size */
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/*------------------------------------------------------------*/
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bl map_flash_by_law1
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lis r4, (CONFIG_SYS_MONITOR_BASE)@h
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ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
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addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
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mtlr r5
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blr
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in_flash:
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#if 1 /* Remapping flash with LAW0. */
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bl remap_flash_by_law0
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#endif
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#endif /* CONFIG_SYS_FLASHBOOT */
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/* setup the bats */
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bl setup_bats
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sync
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/*
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* Cache must be enabled here for stack-in-cache trick.
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* This means we need to enable the BATS.
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* This means:
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* 1) for the EVB, original gt regs need to be mapped
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* 2) need to have an IBAT for the 0xf region,
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* we are running there!
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* Cache should be turned on after BATs, since by default
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* everything is write-through.
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* The init-mem BAT can be reused after reloc. The old
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* gt-regs BAT can be reused after board_init_f calls
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* board_early_init_f (EVB only).
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*/
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/* enable address translation */
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bl enable_addr_trans
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sync
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/* enable the data cache */
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bl dcache_enable
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sync
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#ifdef CONFIG_SYS_INIT_RAM_LOCK
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bl lock_ram_in_cache
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sync
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#endif
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/* set up the stack pointer in our newly created
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* cache-ram; use r3 to keep the new SP for now to
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* avoid overiding the SP it uselessly */
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lis r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
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ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
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/* r4 = end of GD area */
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addi r4, r3, GENERATED_GBL_DATA_SIZE
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/* Zero GD area */
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li r0, 0
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1:
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subi r4, r4, 1
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stb r0, 0(r4)
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cmplw r3, r4
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bne 1b
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#if CONFIG_VAL(SYS_MALLOC_F_LEN)
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#if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
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#error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
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#endif
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/* r3 = new stack pointer / pre-reloc malloc area */
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subi r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN)
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/* Set pointer to pre-reloc malloc area in GD */
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stw r3, GD_MALLOC_BASE(r4)
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#endif
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li r0, 0 /* Make room for stack frame header and */
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stwu r0, -4(r3) /* clear final stack frame so that */
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stwu r0, -4(r3) /* stack backtraces terminate cleanly */
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/* Finally, actually set SP */
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mr r1, r3
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/* let the C-code set up the rest */
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/* */
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/* Be careful to keep code relocatable & stack humble */
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/*------------------------------------------------------*/
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GET_GOT /* initialize GOT access */
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/* r3: IMMR */
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lis r3, CONFIG_SYS_IMMR@h
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/* run low-level CPU init code (in Flash)*/
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bl cpu_init_f
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/* run 1st part of board init code (in Flash)*/
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li r3, 0 /* clear boot_flag for calling board_init_f */
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bl board_init_f
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/* NOTREACHED - board_init_f() does not return */
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#ifndef MINIMAL_SPL
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/*
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* Vector Table
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*/
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.globl _start_of_vectors
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_start_of_vectors:
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/* Machine check */
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STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
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/* Data Storage exception. */
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STD_EXCEPTION(0x300, DataStorage, UnknownException)
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/* Instruction Storage exception. */
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STD_EXCEPTION(0x400, InstStorage, UnknownException)
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/* External Interrupt exception. */
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#ifndef FIXME
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STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
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#endif
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/* Alignment exception. */
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. = 0x600
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Alignment:
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EXCEPTION_PROLOG(SRR0, SRR1)
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mfspr r4,DAR
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stw r4,_DAR(r21)
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mfspr r5,DSISR
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stw r5,_DSISR(r21)
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addi r3,r1,STACK_FRAME_OVERHEAD
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EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
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/* Program check exception */
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. = 0x700
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ProgramCheck:
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EXCEPTION_PROLOG(SRR0, SRR1)
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addi r3,r1,STACK_FRAME_OVERHEAD
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EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
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MSR_KERNEL, COPY_EE)
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STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
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/* I guess we could implement decrementer, and may have
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* to someday for timekeeping.
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*/
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STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
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STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
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STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
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STD_EXCEPTION(0xc00, SystemCall, UnknownException)
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STD_EXCEPTION(0xd00, SingleStep, UnknownException)
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STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
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STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
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STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
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STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
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STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
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#ifdef DEBUG
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. = 0x1300
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/*
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* This exception occurs when the program counter matches the
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* Instruction Address Breakpoint Register (IABR).
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*
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* I want the cpu to halt if this occurs so I can hunt around
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* with the debugger and look at things.
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*
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* When DEBUG is defined, both machine check enable (in the MSR)
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* and checkstop reset enable (in the reset mode register) are
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* turned off and so a checkstop condition will result in the cpu
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* halting.
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*
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* I force the cpu into a checkstop condition by putting an illegal
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* instruction here (at least this is the theory).
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*
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* well - that didnt work, so just do an infinite loop!
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*/
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1: b 1b
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#else
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STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
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#endif
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STD_EXCEPTION(0x1400, SMI, UnknownException)
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STD_EXCEPTION(0x1500, Trap_15, UnknownException)
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STD_EXCEPTION(0x1600, Trap_16, UnknownException)
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STD_EXCEPTION(0x1700, Trap_17, UnknownException)
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STD_EXCEPTION(0x1800, Trap_18, UnknownException)
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STD_EXCEPTION(0x1900, Trap_19, UnknownException)
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STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
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STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
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STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
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STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
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STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
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STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
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STD_EXCEPTION(0x2000, Trap_20, UnknownException)
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STD_EXCEPTION(0x2100, Trap_21, UnknownException)
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STD_EXCEPTION(0x2200, Trap_22, UnknownException)
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STD_EXCEPTION(0x2300, Trap_23, UnknownException)
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STD_EXCEPTION(0x2400, Trap_24, UnknownException)
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STD_EXCEPTION(0x2500, Trap_25, UnknownException)
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STD_EXCEPTION(0x2600, Trap_26, UnknownException)
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STD_EXCEPTION(0x2700, Trap_27, UnknownException)
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STD_EXCEPTION(0x2800, Trap_28, UnknownException)
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STD_EXCEPTION(0x2900, Trap_29, UnknownException)
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STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
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STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
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STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
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STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
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STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
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STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
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|
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.globl _end_of_vectors
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_end_of_vectors:
|
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. = 0x3000
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/*
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* This code finishes saving the registers to the exception frame
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* and jumps to the appropriate handler for the exception.
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* Register r21 is pointer into trap frame, r1 has new stack pointer.
|
*/
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.globl transfer_to_handler
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transfer_to_handler:
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stw r22,_NIP(r21)
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lis r22,MSR_POW@h
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andc r23,r23,r22
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stw r23,_MSR(r21)
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SAVE_GPR(7, r21)
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SAVE_4GPRS(8, r21)
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SAVE_8GPRS(12, r21)
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SAVE_8GPRS(24, r21)
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mflr r23
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andi. r24,r23,0x3f00 /* get vector offset */
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stw r24,TRAP(r21)
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li r22,0
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stw r22,RESULT(r21)
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lwz r24,0(r23) /* virtual address of handler */
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lwz r23,4(r23) /* where to go when done */
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mtspr SRR0,r24
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mtspr SRR1,r20
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mtlr r23
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SYNC
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rfi /* jump to handler, enable MMU */
|
|
int_return:
|
mfmsr r28 /* Disable interrupts */
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li r4,0
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ori r4,r4,MSR_EE
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andc r28,r28,r4
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SYNC /* Some chip revs need this... */
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mtmsr r28
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SYNC
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lwz r2,_CTR(r1)
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lwz r0,_LINK(r1)
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mtctr r2
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mtlr r0
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lwz r2,_XER(r1)
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lwz r0,_CCR(r1)
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mtspr XER,r2
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mtcrf 0xFF,r0
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REST_10GPRS(3, r1)
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REST_10GPRS(13, r1)
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REST_8GPRS(23, r1)
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REST_GPR(31, r1)
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lwz r2,_NIP(r1) /* Restore environment */
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lwz r0,_MSR(r1)
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mtspr SRR0,r2
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mtspr SRR1,r0
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lwz r0,GPR0(r1)
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lwz r2,GPR2(r1)
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lwz r1,GPR1(r1)
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SYNC
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rfi
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#endif /* !MINIMAL_SPL */
|
|
/*
|
* This code initialises the E300 processor core
|
* (conforms to PowerPC 603e spec)
|
* Note: expects original MSR contents to be in r5.
|
*/
|
.globl init_e300_core
|
init_e300_core: /* time t 10 */
|
/* Initialize machine status; enable machine check interrupt */
|
/*-----------------------------------------------------------*/
|
|
li r3, MSR_KERNEL /* Set ME and RI flags */
|
rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
|
#ifdef DEBUG
|
rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
|
#endif
|
SYNC /* Some chip revs need this... */
|
mtmsr r3
|
SYNC
|
mtspr SRR1, r3 /* Make SRR1 match MSR */
|
|
|
lis r3, CONFIG_SYS_IMMR@h
|
#if defined(CONFIG_WATCHDOG)
|
/* Initialise the Watchdog values and reset it (if req) */
|
/*------------------------------------------------------*/
|
lis r4, CONFIG_SYS_WATCHDOG_VALUE
|
ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
|
stw r4, SWCRR(r3)
|
|
/* and reset it */
|
|
li r4, 0x556C
|
sth r4, SWSRR@l(r3)
|
li r4, -0x55C7
|
sth r4, SWSRR@l(r3)
|
#else
|
/* Disable Watchdog */
|
/*-------------------*/
|
lwz r4, SWCRR(r3)
|
/* Check to see if its enabled for disabling
|
once disabled by SW you can't re-enable */
|
andi. r4, r4, 0x4
|
beq 1f
|
xor r4, r4, r4
|
stw r4, SWCRR(r3)
|
1:
|
#endif /* CONFIG_WATCHDOG */
|
|
#if defined(CONFIG_MASK_AER_AO)
|
/* Write the Arbiter Event Enable to mask Address Only traps. */
|
/* This prevents the dcbz instruction from being trapped when */
|
/* HID0_ABE Address Broadcast Enable is set and the MEMORY */
|
/* COHERENCY bit is set in the WIMG bits, which is often */
|
/* needed for PCI operation. */
|
lwz r4, 0x0808(r3)
|
rlwinm r0, r4, 0, ~AER_AO
|
stw r0, 0x0808(r3)
|
#endif /* CONFIG_MASK_AER_AO */
|
|
/* Initialize the Hardware Implementation-dependent Registers */
|
/* HID0 also contains cache control */
|
/* - force invalidation of data and instruction caches */
|
/*------------------------------------------------------*/
|
|
lis r3, CONFIG_SYS_HID0_INIT@h
|
ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
|
SYNC
|
mtspr HID0, r3
|
|
lis r3, CONFIG_SYS_HID0_FINAL@h
|
ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
|
SYNC
|
mtspr HID0, r3
|
|
lis r3, CONFIG_SYS_HID2@h
|
ori r3, r3, CONFIG_SYS_HID2@l
|
SYNC
|
mtspr HID2, r3
|
|
/* Done! */
|
/*------------------------------*/
|
blr
|
|
/* setup_bats - set them up to some initial state */
|
.globl setup_bats
|
setup_bats:
|
addis r0, r0, 0x0000
|
|
/* IBAT 0 */
|
addis r4, r0, CONFIG_SYS_IBAT0L@h
|
ori r4, r4, CONFIG_SYS_IBAT0L@l
|
addis r3, r0, CONFIG_SYS_IBAT0U@h
|
ori r3, r3, CONFIG_SYS_IBAT0U@l
|
mtspr IBAT0L, r4
|
mtspr IBAT0U, r3
|
|
/* DBAT 0 */
|
addis r4, r0, CONFIG_SYS_DBAT0L@h
|
ori r4, r4, CONFIG_SYS_DBAT0L@l
|
addis r3, r0, CONFIG_SYS_DBAT0U@h
|
ori r3, r3, CONFIG_SYS_DBAT0U@l
|
mtspr DBAT0L, r4
|
mtspr DBAT0U, r3
|
|
/* IBAT 1 */
|
addis r4, r0, CONFIG_SYS_IBAT1L@h
|
ori r4, r4, CONFIG_SYS_IBAT1L@l
|
addis r3, r0, CONFIG_SYS_IBAT1U@h
|
ori r3, r3, CONFIG_SYS_IBAT1U@l
|
mtspr IBAT1L, r4
|
mtspr IBAT1U, r3
|
|
/* DBAT 1 */
|
addis r4, r0, CONFIG_SYS_DBAT1L@h
|
ori r4, r4, CONFIG_SYS_DBAT1L@l
|
addis r3, r0, CONFIG_SYS_DBAT1U@h
|
ori r3, r3, CONFIG_SYS_DBAT1U@l
|
mtspr DBAT1L, r4
|
mtspr DBAT1U, r3
|
|
/* IBAT 2 */
|
addis r4, r0, CONFIG_SYS_IBAT2L@h
|
ori r4, r4, CONFIG_SYS_IBAT2L@l
|
addis r3, r0, CONFIG_SYS_IBAT2U@h
|
ori r3, r3, CONFIG_SYS_IBAT2U@l
|
mtspr IBAT2L, r4
|
mtspr IBAT2U, r3
|
|
/* DBAT 2 */
|
addis r4, r0, CONFIG_SYS_DBAT2L@h
|
ori r4, r4, CONFIG_SYS_DBAT2L@l
|
addis r3, r0, CONFIG_SYS_DBAT2U@h
|
ori r3, r3, CONFIG_SYS_DBAT2U@l
|
mtspr DBAT2L, r4
|
mtspr DBAT2U, r3
|
|
/* IBAT 3 */
|
addis r4, r0, CONFIG_SYS_IBAT3L@h
|
ori r4, r4, CONFIG_SYS_IBAT3L@l
|
addis r3, r0, CONFIG_SYS_IBAT3U@h
|
ori r3, r3, CONFIG_SYS_IBAT3U@l
|
mtspr IBAT3L, r4
|
mtspr IBAT3U, r3
|
|
/* DBAT 3 */
|
addis r4, r0, CONFIG_SYS_DBAT3L@h
|
ori r4, r4, CONFIG_SYS_DBAT3L@l
|
addis r3, r0, CONFIG_SYS_DBAT3U@h
|
ori r3, r3, CONFIG_SYS_DBAT3U@l
|
mtspr DBAT3L, r4
|
mtspr DBAT3U, r3
|
|
#ifdef CONFIG_HIGH_BATS
|
/* IBAT 4 */
|
addis r4, r0, CONFIG_SYS_IBAT4L@h
|
ori r4, r4, CONFIG_SYS_IBAT4L@l
|
addis r3, r0, CONFIG_SYS_IBAT4U@h
|
ori r3, r3, CONFIG_SYS_IBAT4U@l
|
mtspr IBAT4L, r4
|
mtspr IBAT4U, r3
|
|
/* DBAT 4 */
|
addis r4, r0, CONFIG_SYS_DBAT4L@h
|
ori r4, r4, CONFIG_SYS_DBAT4L@l
|
addis r3, r0, CONFIG_SYS_DBAT4U@h
|
ori r3, r3, CONFIG_SYS_DBAT4U@l
|
mtspr DBAT4L, r4
|
mtspr DBAT4U, r3
|
|
/* IBAT 5 */
|
addis r4, r0, CONFIG_SYS_IBAT5L@h
|
ori r4, r4, CONFIG_SYS_IBAT5L@l
|
addis r3, r0, CONFIG_SYS_IBAT5U@h
|
ori r3, r3, CONFIG_SYS_IBAT5U@l
|
mtspr IBAT5L, r4
|
mtspr IBAT5U, r3
|
|
/* DBAT 5 */
|
addis r4, r0, CONFIG_SYS_DBAT5L@h
|
ori r4, r4, CONFIG_SYS_DBAT5L@l
|
addis r3, r0, CONFIG_SYS_DBAT5U@h
|
ori r3, r3, CONFIG_SYS_DBAT5U@l
|
mtspr DBAT5L, r4
|
mtspr DBAT5U, r3
|
|
/* IBAT 6 */
|
addis r4, r0, CONFIG_SYS_IBAT6L@h
|
ori r4, r4, CONFIG_SYS_IBAT6L@l
|
addis r3, r0, CONFIG_SYS_IBAT6U@h
|
ori r3, r3, CONFIG_SYS_IBAT6U@l
|
mtspr IBAT6L, r4
|
mtspr IBAT6U, r3
|
|
/* DBAT 6 */
|
addis r4, r0, CONFIG_SYS_DBAT6L@h
|
ori r4, r4, CONFIG_SYS_DBAT6L@l
|
addis r3, r0, CONFIG_SYS_DBAT6U@h
|
ori r3, r3, CONFIG_SYS_DBAT6U@l
|
mtspr DBAT6L, r4
|
mtspr DBAT6U, r3
|
|
/* IBAT 7 */
|
addis r4, r0, CONFIG_SYS_IBAT7L@h
|
ori r4, r4, CONFIG_SYS_IBAT7L@l
|
addis r3, r0, CONFIG_SYS_IBAT7U@h
|
ori r3, r3, CONFIG_SYS_IBAT7U@l
|
mtspr IBAT7L, r4
|
mtspr IBAT7U, r3
|
|
/* DBAT 7 */
|
addis r4, r0, CONFIG_SYS_DBAT7L@h
|
ori r4, r4, CONFIG_SYS_DBAT7L@l
|
addis r3, r0, CONFIG_SYS_DBAT7U@h
|
ori r3, r3, CONFIG_SYS_DBAT7U@l
|
mtspr DBAT7L, r4
|
mtspr DBAT7U, r3
|
#endif
|
|
isync
|
|
/* invalidate all tlb's
|
*
|
* From the 603e User Manual: "The 603e provides the ability to
|
* invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
|
* instruction invalidates the TLB entry indexed by the EA, and
|
* operates on both the instruction and data TLBs simultaneously
|
* invalidating four TLB entries (both sets in each TLB). The
|
* index corresponds to bits 15-19 of the EA. To invalidate all
|
* entries within both TLBs, 32 tlbie instructions should be
|
* issued, incrementing this field by one each time."
|
*
|
* "Note that the tlbia instruction is not implemented on the
|
* 603e."
|
*
|
* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
|
* incrementing by 0x1000 each time. The code below is sort of
|
* based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
|
*
|
*/
|
lis r3, 0
|
lis r5, 2
|
|
1:
|
tlbie r3
|
addi r3, r3, 0x1000
|
cmp 0, 0, r3, r5
|
blt 1b
|
|
blr
|
|
/* Cache functions.
|
*
|
* Note: requires that all cache bits in
|
* HID0 are in the low half word.
|
*/
|
#ifndef MINIMAL_SPL
|
.globl icache_enable
|
icache_enable:
|
mfspr r3, HID0
|
ori r3, r3, HID0_ICE
|
li r4, HID0_ICFI|HID0_ILOCK
|
andc r3, r3, r4
|
ori r4, r3, HID0_ICFI
|
isync
|
mtspr HID0, r4 /* sets enable and invalidate, clears lock */
|
isync
|
mtspr HID0, r3 /* clears invalidate */
|
blr
|
|
.globl icache_disable
|
icache_disable:
|
mfspr r3, HID0
|
lis r4, 0
|
ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
|
andc r3, r3, r4
|
isync
|
mtspr HID0, r3 /* clears invalidate, enable and lock */
|
blr
|
|
.globl icache_status
|
icache_status:
|
mfspr r3, HID0
|
rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
|
blr
|
#endif /* !MINIMAL_SPL */
|
|
.globl dcache_enable
|
dcache_enable:
|
mfspr r3, HID0
|
li r5, HID0_DCFI|HID0_DLOCK
|
andc r3, r3, r5
|
ori r3, r3, HID0_DCE
|
sync
|
mtspr HID0, r3 /* enable, no invalidate */
|
blr
|
|
.globl dcache_disable
|
dcache_disable:
|
mflr r4
|
bl flush_dcache /* uses r3 and r5 */
|
mfspr r3, HID0
|
li r5, HID0_DCE|HID0_DLOCK
|
andc r3, r3, r5
|
ori r5, r3, HID0_DCFI
|
sync
|
mtspr HID0, r5 /* sets invalidate, clears enable and lock */
|
sync
|
mtspr HID0, r3 /* clears invalidate */
|
mtlr r4
|
blr
|
|
.globl dcache_status
|
dcache_status:
|
mfspr r3, HID0
|
rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
|
blr
|
|
.globl flush_dcache
|
flush_dcache:
|
lis r3, 0
|
lis r5, CONFIG_SYS_CACHELINE_SIZE
|
1: cmp 0, 1, r3, r5
|
bge 2f
|
lwz r5, 0(r3)
|
lis r5, CONFIG_SYS_CACHELINE_SIZE
|
addi r3, r3, 0x4
|
b 1b
|
2: blr
|
|
/*-------------------------------------------------------------------*/
|
|
/*
|
* void relocate_code (addr_sp, gd, addr_moni)
|
*
|
* This "function" does not return, instead it continues in RAM
|
* after relocating the monitor code.
|
*
|
* r3 = dest
|
* r4 = src
|
* r5 = length in bytes
|
* r6 = cachelinesize
|
*/
|
.globl relocate_code
|
relocate_code:
|
mr r1, r3 /* Set new stack pointer */
|
mr r9, r4 /* Save copy of Global Data pointer */
|
mr r10, r5 /* Save copy of Destination Address */
|
|
GET_GOT
|
mr r3, r5 /* Destination Address */
|
lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
|
ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
|
lwz r5, GOT(__bss_start)
|
sub r5, r5, r4
|
li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
|
|
/*
|
* Fix GOT pointer:
|
*
|
* New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
|
* + Destination Address
|
*
|
* Offset:
|
*/
|
sub r15, r10, r4
|
|
/* First our own GOT */
|
add r12, r12, r15
|
/* then the one used by the C code */
|
add r30, r30, r15
|
|
/*
|
* Now relocate code
|
*/
|
|
cmplw cr1,r3,r4
|
addi r0,r5,3
|
srwi. r0,r0,2
|
beq cr1,4f /* In place copy is not necessary */
|
beq 7f /* Protect against 0 count */
|
mtctr r0
|
bge cr1,2f
|
la r8,-4(r4)
|
la r7,-4(r3)
|
|
/* copy */
|
1: lwzu r0,4(r8)
|
stwu r0,4(r7)
|
bdnz 1b
|
|
addi r0,r5,3
|
srwi. r0,r0,2
|
mtctr r0
|
la r8,-4(r4)
|
la r7,-4(r3)
|
|
/* and compare */
|
20: lwzu r20,4(r8)
|
lwzu r21,4(r7)
|
xor. r22, r20, r21
|
bne 30f
|
bdnz 20b
|
b 4f
|
|
/* compare failed */
|
30: li r3, 0
|
blr
|
|
2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
|
add r8,r4,r0
|
add r7,r3,r0
|
3: lwzu r0,-4(r8)
|
stwu r0,-4(r7)
|
bdnz 3b
|
|
/*
|
* Now flush the cache: note that we must start from a cache aligned
|
* address. Otherwise we might miss one cache line.
|
*/
|
4: cmpwi r6,0
|
add r5,r3,r5
|
beq 7f /* Always flush prefetch queue in any case */
|
subi r0,r6,1
|
andc r3,r3,r0
|
mr r4,r3
|
5: dcbst 0,r4
|
add r4,r4,r6
|
cmplw r4,r5
|
blt 5b
|
sync /* Wait for all dcbst to complete on bus */
|
mr r4,r3
|
6: icbi 0,r4
|
add r4,r4,r6
|
cmplw r4,r5
|
blt 6b
|
7: sync /* Wait for all icbi to complete on bus */
|
isync
|
|
/*
|
* We are done. Do not return, instead branch to second part of board
|
* initialization, now running from RAM.
|
*/
|
addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
|
mtlr r0
|
blr
|
|
in_ram:
|
|
/*
|
* Relocation Function, r12 point to got2+0x8000
|
*
|
* Adjust got2 pointers, no need to check for 0, this code
|
* already puts a few entries in the table.
|
*/
|
li r0,__got2_entries@sectoff@l
|
la r3,GOT(_GOT2_TABLE_)
|
lwz r11,GOT(_GOT2_TABLE_)
|
mtctr r0
|
sub r11,r3,r11
|
addi r3,r3,-4
|
1: lwzu r0,4(r3)
|
cmpwi r0,0
|
beq- 2f
|
add r0,r0,r11
|
stw r0,0(r3)
|
2: bdnz 1b
|
|
#ifndef MINIMAL_SPL
|
/*
|
* Now adjust the fixups and the pointers to the fixups
|
* in case we need to move ourselves again.
|
*/
|
li r0,__fixup_entries@sectoff@l
|
lwz r3,GOT(_FIXUP_TABLE_)
|
cmpwi r0,0
|
mtctr r0
|
addi r3,r3,-4
|
beq 4f
|
3: lwzu r4,4(r3)
|
lwzux r0,r4,r11
|
cmpwi r0,0
|
add r0,r0,r11
|
stw r4,0(r3)
|
beq- 5f
|
stw r0,0(r4)
|
5: bdnz 3b
|
4:
|
#endif
|
|
clear_bss:
|
/*
|
* Now clear BSS segment
|
*/
|
lwz r3,GOT(__bss_start)
|
lwz r4,GOT(__bss_end)
|
|
cmplw 0, r3, r4
|
beq 6f
|
|
li r0, 0
|
5:
|
stw r0, 0(r3)
|
addi r3, r3, 4
|
cmplw 0, r3, r4
|
bne 5b
|
6:
|
|
mr r3, r9 /* Global Data pointer */
|
mr r4, r10 /* Destination Address */
|
bl board_init_r
|
|
#ifndef MINIMAL_SPL
|
/*
|
* Copy exception vector code to low memory
|
*
|
* r3: dest_addr
|
* r7: source address, r8: end address, r9: target address
|
*/
|
.globl trap_init
|
trap_init:
|
mflr r4 /* save link register */
|
GET_GOT
|
lwz r7, GOT(_start)
|
lwz r8, GOT(_end_of_vectors)
|
|
li r9, 0x100 /* reset vector always at 0x100 */
|
|
cmplw 0, r7, r8
|
bgelr /* return if r7>=r8 - just in case */
|
1:
|
lwz r0, 0(r7)
|
stw r0, 0(r9)
|
addi r7, r7, 4
|
addi r9, r9, 4
|
cmplw 0, r7, r8
|
bne 1b
|
|
/*
|
* relocate `hdlr' and `int_return' entries
|
*/
|
li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
|
li r8, Alignment - _start + EXC_OFF_SYS_RESET
|
2:
|
bl trap_reloc
|
addi r7, r7, 0x100 /* next exception vector */
|
cmplw 0, r7, r8
|
blt 2b
|
|
li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
|
bl trap_reloc
|
|
li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
|
bl trap_reloc
|
|
li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
|
li r8, SystemCall - _start + EXC_OFF_SYS_RESET
|
3:
|
bl trap_reloc
|
addi r7, r7, 0x100 /* next exception vector */
|
cmplw 0, r7, r8
|
blt 3b
|
|
li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
|
li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
|
4:
|
bl trap_reloc
|
addi r7, r7, 0x100 /* next exception vector */
|
cmplw 0, r7, r8
|
blt 4b
|
|
mfmsr r3 /* now that the vectors have */
|
lis r7, MSR_IP@h /* relocated into low memory */
|
ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
|
andc r3, r3, r7 /* (if it was on) */
|
SYNC /* Some chip revs need this... */
|
mtmsr r3
|
SYNC
|
|
mtlr r4 /* restore link register */
|
blr
|
|
#endif /* !MINIMAL_SPL */
|
|
#ifdef CONFIG_SYS_INIT_RAM_LOCK
|
lock_ram_in_cache:
|
/* Allocate Initial RAM in data cache.
|
*/
|
lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
|
ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
|
li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
|
(CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
|
mtctr r4
|
1:
|
dcbz r0, r3
|
addi r3, r3, 32
|
bdnz 1b
|
|
/* Lock the data cache */
|
mfspr r0, HID0
|
ori r0, r0, HID0_DLOCK
|
sync
|
mtspr HID0, r0
|
sync
|
blr
|
|
#ifndef MINIMAL_SPL
|
.globl unlock_ram_in_cache
|
unlock_ram_in_cache:
|
/* invalidate the INIT_RAM section */
|
lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
|
ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
|
li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
|
(CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
|
mtctr r4
|
1: icbi r0, r3
|
dcbi r0, r3
|
addi r3, r3, 32
|
bdnz 1b
|
sync /* Wait for all icbi to complete on bus */
|
isync
|
|
/* Unlock the data cache and invalidate it */
|
mfspr r3, HID0
|
li r5, HID0_DLOCK|HID0_DCFI
|
andc r3, r3, r5 /* no invalidate, unlock */
|
ori r5, r3, HID0_DCFI /* invalidate, unlock */
|
sync
|
mtspr HID0, r5 /* invalidate, unlock */
|
sync
|
mtspr HID0, r3 /* no invalidate, unlock */
|
blr
|
#endif /* !MINIMAL_SPL */
|
#endif /* CONFIG_SYS_INIT_RAM_LOCK */
|
|
#ifdef CONFIG_SYS_FLASHBOOT
|
map_flash_by_law1:
|
/* When booting from ROM (Flash or EPROM), clear the */
|
/* Address Mask in OR0 so ROM appears everywhere */
|
/*----------------------------------------------------*/
|
lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
|
lwz r4, OR0@l(r3)
|
li r5, 0x7fff /* r5 <= 0x00007FFFF */
|
and r4, r4, r5
|
stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
|
|
/* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
|
* system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
|
* reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
|
* from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
|
* 0xFF800. From the hard resetting to here, the processor fetched and
|
* executed the instructions one by one. There is not absolutely
|
* jumping happened. Laterly, the u-boot code has to do an absolutely
|
* jumping to tell the CPU instruction fetching component what the
|
* u-boot TEXT base address is. Because the TEXT base resides in the
|
* boot ROM memory space, to garantee the code can run smoothly after
|
* that jumping, we must map in the entire boot ROM by Local Access
|
* Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
|
* address for boot ROM, such as 0xFE000000. In this case, the default
|
* LBIU Local Access Widow 0 will not cover this memory space. So, we
|
* need another window to map in it.
|
*/
|
lis r4, (CONFIG_SYS_FLASH_BASE)@h
|
ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
|
stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */
|
|
/* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */
|
lis r4, (0x80000012)@h
|
ori r4, r4, (0x80000012)@l
|
li r5, CONFIG_SYS_FLASH_SIZE
|
1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
|
addi r4, r4, 1
|
bne 1b
|
|
stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
|
/* Wait for HW to catch up */
|
lwz r4, LBLAWAR1(r3)
|
twi 0,r4,0
|
isync
|
blr
|
|
/* Though all the LBIU Local Access Windows and LBC Banks will be
|
* initialized in the C code, we'd better configure boot ROM's
|
* window 0 and bank 0 correctly at here.
|
*/
|
remap_flash_by_law0:
|
/* Initialize the BR0 with the boot ROM starting address. */
|
lwz r4, BR0(r3)
|
li r5, 0x7FFF
|
and r4, r4, r5
|
lis r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h
|
ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l
|
or r5, r5, r4
|
stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
|
|
lwz r4, OR0(r3)
|
lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1)
|
or r4, r4, r5
|
stw r4, OR0(r3)
|
|
lis r4, (CONFIG_SYS_FLASH_BASE)@h
|
ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
|
stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */
|
|
/* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */
|
lis r4, (0x80000012)@h
|
ori r4, r4, (0x80000012)@l
|
li r5, CONFIG_SYS_FLASH_SIZE
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1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
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addi r4, r4, 1
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bne 1b
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stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
|
|
|
xor r4, r4, r4
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stw r4, LBLAWBAR1(r3)
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stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
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/* Wait for HW to catch up */
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lwz r4, LBLAWAR1(r3)
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twi 0,r4,0
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isync
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blr
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#endif /* CONFIG_SYS_FLASHBOOT */
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