cpu/mpc8260/start.S

/*
 *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
 *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
 *  Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 *  U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards
 */
#include <config.h>
#include <mpc8260.h>
#include <version.h>

#define CONFIG_8260 1		/* needed for Linux kernel header files */
#define _LINUX_CONFIG_H 1	/* avoid reading Linux autoconf.h file	*/

#include <ppc_asm.tmpl>
#include <ppc_defs.h>

#include <asm/cache.h>
#include <asm/mmu.h>

#ifndef  CONFIG_IDENT_STRING
#define  CONFIG_IDENT_STRING ""
#endif

/* We don't want the  MMU yet.
*/
#undef	MSR_KERNEL
/* Floating Point enable, Machine Check and Recoverable Interr. */
#ifdef DEBUG
#define MSR_KERNEL (MSR_FP|MSR_RI)
#else
#define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
#endif

/*
 * Set up GOT: Global Offset Table
 *
 * Use r14 to access the GOT
 */
	START_GOT
	GOT_ENTRY(_GOT2_TABLE_)
	GOT_ENTRY(_FIXUP_TABLE_)

	GOT_ENTRY(_start)
	GOT_ENTRY(_start_of_vectors)
	GOT_ENTRY(_end_of_vectors)
	GOT_ENTRY(transfer_to_handler)

	GOT_ENTRY(_end)
	GOT_ENTRY(__bss_start)
#if defined(CONFIG_HYMOD)
	GOT_ENTRY(environment)
#endif
	END_GOT

/*
 * Version string - must be in data segment because MPC8260 uses the first
 * 256 bytes for the Hard Reset Configuration Word table (see below).
 * Similarly, can't have the U-Boot Magic Number as the first thing in
 * the image - don't know how this will affect the image tools, but I guess
 * I'll find out soon
 */
	.data
	.globl	version_string
version_string:
	.ascii U_BOOT_VERSION
	.ascii " (", __DATE__, " - ", __TIME__, ")"
	.ascii CONFIG_IDENT_STRING, "\0"

/*
 *  Hard Reset Configuration Word (HRCW) table
 *
 *  The Hard Reset Configuration Word (HRCW) sets a number of useful things
 *  such as whether there is an external memory controller, whether the
 *  PowerPC core is disabled (i.e. only the communications processor is
 *  active, accessed by another CPU on the bus), whether using external
 *  arbitration, external bus mode, boot port size, core initial prefix,
 *  internal space base, boot memory space, etc.
 *
 *  These things dictate where the processor begins execution, where the
 *  boot ROM appears in memory, the memory controller setup when access
 *  boot ROM, etc. The HRCW is *extremely* important.
 *
 *  The HRCW is read from the bus during reset. One CPU on the bus will
 *  be a hard reset configuration master, any others will be hard reset
 *  configuration slaves. The master reads eight HRCWs from flash during
 *  reset - the first it uses for itself, the other 7 it communicates to
 *  up to 7 configuration slaves by some complicated mechanism, which is
 *  not really important here.
 *
 *  The configuration master performs 32 successive reads starting at address
 *  0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8
 *  bits is read, and always from byte lane D[0-7] (so that port size of the
 *  boot device does not matter). The first four reads form the 32 bit HRCW
 *  for the master itself. The second four reads form the HRCW for the first
 *  slave, and so on, up to seven slaves. The 32 bit HRCW is formed by
 *  concatenating the four bytes, with the first read placed in byte 0 (the
 *  most significant byte), and so on with the fourth read placed in byte 3
 *  (the least significant byte).
 */
#define _HRCW_TABLE_ENTRY(w)		\
	.fill	8,1,(((w)>>24)&0xff);	\
	.fill	8,1,(((w)>>16)&0xff);	\
	.fill	8,1,(((w)>> 8)&0xff);	\
	.fill	8,1,(((w)    )&0xff)
	.text
	.globl	_hrcw_table
_hrcw_table:
	_HRCW_TABLE_ENTRY(CFG_HRCW_MASTER)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE1)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE2)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE3)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE4)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE5)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE6)
	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE7)
/*
 *  After configuration, a system reset exception is executed using the
 *  vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP]
 *  is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address
 *  is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value
 *  of MSR[IP] is determined by the CIP field in the HRCW.
 *
 *  Other bits in the HRCW set up the Base Address and Port Size in BR0.
 *  This determines the location of the boot ROM (flash or EPROM) in the
 *  processor's address space at boot time. As long as the HRCW is set up
 *  so that we eventually end up executing the code below when the processor
 *  executes the reset exception, the actual values used should not matter.
 *
 *  Once we have got here, the address mask in OR0 is cleared so that the
 *  bottom 32K of the boot ROM is effectively repeated all throughout the
 *  processor's address space, after which we can jump to the absolute
 *  address at which the boot ROM was linked at compile time, and proceed
 *  to initialise the memory controller without worrying if the rug will be
 *  pulled out from under us, so to speak (it will be fine as long as we
 *  configure BR0 with the same boot ROM link address).
 */
	. = EXC_OFF_SYS_RESET

	.globl	_start
_start:
	li	r21, BOOTFLAG_COLD	/* Normal Power-On: Boot from FLASH*/
	b	boot_cold

	. = EXC_OFF_SYS_RESET + 0x10

	.globl	_start_warm
_start_warm:
	li	r21, BOOTFLAG_WARM	/* Software reboot		*/
	b	boot_warm

boot_cold:
boot_warm:
	mfmsr	r5			/* save msr contents		*/

#if defined(CONFIG_COGENT)
	/* this is what the cogent EPROM does */
	li	r0, 0
	mtmsr	r0
	isync
	bl	cogent_init_8260
#endif	/* CONFIG_COGENT */

#if defined(CFG_DEFAULT_IMMR)
	lis	r3, CFG_IMMR@h
	ori	r3, r3, CFG_IMMR@l
	lis	r4, CFG_DEFAULT_IMMR@h
	stw	r3, 0x1A8(r4)
#endif /* CFG_DEFAULT_IMMR */

	/* Initialise the MPC8260 processor core			*/
	/*--------------------------------------------------------------*/

	bl	init_8260_core

#ifndef CFG_RAMBOOT
	/* When booting from ROM (Flash or EPROM), clear the		*/
	/* Address Mask in OR0 so ROM appears everywhere		*/
	/*--------------------------------------------------------------*/

	lis	r3, (CFG_IMMR+IM_REGBASE)@h
	lwz	r4, IM_OR0@l(r3)
	li	r5, 0x7fff
	and	r4, r4, r5
	stw	r4, IM_OR0@l(r3)

	/* Calculate absolute address in FLASH and jump there		*/
	/*--------------------------------------------------------------*/

	lis	r3, CFG_MONITOR_BASE@h
	ori	r3, r3, CFG_MONITOR_BASE@l
	addi	r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
	mtlr	r3
	blr

in_flash:
#endif	/* CFG_RAMBOOT */

	/* initialize some things that are hard to access from C	*/
	/*--------------------------------------------------------------*/

	lis	r3, CFG_IMMR@h		/* set up stack in internal DPRAM */
	ori	r1, r3, CFG_INIT_SP_OFFSET
	li	r0, 0			/* Make room for stack frame header and	*/
	stwu	r0, -4(r1)		/* clear final stack frame so that	*/
	stwu	r0, -4(r1)		/* stack backtraces terminate cleanly	*/

	/* let the C-code set up the rest				*/
	/*								*/
	/* Be careful to keep code relocatable !			*/
	/*--------------------------------------------------------------*/

	GET_GOT			/* initialize GOT access		*/

	/* r3: IMMR */
	bl	cpu_init_f	/* run low-level CPU init code (in Flash)*/

#ifdef DEBUG
	bl	init_debug	/* set up debugging stuff		*/
#endif

	mr	r3, r21
	/* r3: BOOTFLAG */
	bl	board_init_f	/* run 1st part of board init code (in Flash)*/

/*
 * Vector Table
 */

	.globl	_start_of_vectors
_start_of_vectors:

/* Machine check */
	STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)

/* Data Storage exception. */
	STD_EXCEPTION(0x300, DataStorage, UnknownException)

/* Instruction Storage exception. */
	STD_EXCEPTION(0x400, InstStorage, UnknownException)

/* External Interrupt exception. */
	STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)

/* Alignment exception. */
	. = 0x600
Alignment:
	EXCEPTION_PROLOG
	mfspr	r4,DAR
	stw	r4,_DAR(r21)
	mfspr	r5,DSISR
	stw	r5,_DSISR(r21)
	addi	r3,r1,STACK_FRAME_OVERHEAD
	li	r20,MSR_KERNEL
	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
	rlwimi	r20,r23,0,25,25		/* copy IP bit from saved MSR */
	lwz	r6,GOT(transfer_to_handler)
	mtlr	r6
	blrl
.L_Alignment:
	.long	AlignmentException - _start + EXC_OFF_SYS_RESET
	.long	int_return - _start + EXC_OFF_SYS_RESET

/* Program check exception */
	. = 0x700
ProgramCheck:
	EXCEPTION_PROLOG
	addi	r3,r1,STACK_FRAME_OVERHEAD
	li	r20,MSR_KERNEL
	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
	rlwimi	r20,r23,0,25,25		/* copy IP bit from saved MSR */
	lwz	r6,GOT(transfer_to_handler)
	mtlr	r6
	blrl
.L_ProgramCheck:
	.long	ProgramCheckException - _start + EXC_OFF_SYS_RESET
	.long	int_return - _start + EXC_OFF_SYS_RESET

	STD_EXCEPTION(0x800, FPUnavailable, UnknownException)

	/* I guess we could implement decrementer, and may have
	 * to someday for timekeeping.
	 */
	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)

	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)

	. = 0xc00
/*
 * r0 - SYSCALL number
 * r3-... arguments
 */
SystemCall:
	addis	r11,r0,0		/* get functions table addr */
	ori	r11,r11,0		/* Note: this code is patched in trap_init */
	addis	r12,r0,0		/* get number of functions */
	ori	r12,r12,0

	cmplw	0, r0, r12
	bge	1f

	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
	add	r11,r11,r0
	lwz	r11,0(r11)

	li	r20,0xd00-4		/* Get stack pointer */
	lwz	r12,0(r20)
	subi	r12,r12,12		/* Adjust stack pointer */
	li	r0,0xc00+_end_back-SystemCall
	cmplw	0, r0, r12		/* Check stack overflow */
	bgt	1f
	stw	r12,0(r20)

	mflr	r0
	stw	r0,0(r12)
	mfspr	r0,SRR0
	stw	r0,4(r12)
	mfspr	r0,SRR1
	stw	r0,8(r12)

	li	r12,0xc00+_back-SystemCall
	mtlr	r12
	mtspr	SRR0,r11

1:	SYNC
	rfi

_back:

	mfmsr	r11			/* Disable interrupts */
	li	r12,0
	ori	r12,r12,MSR_EE
	andc	r11,r11,r12
	SYNC				/* Some chip revs need this... */
	mtmsr	r11
	SYNC

	li	r12,0xd00-4		/* restore regs */
	lwz	r12,0(r12)

	lwz	r11,0(r12)
	mtlr	r11
	lwz	r11,4(r12)
	mtspr	SRR0,r11
	lwz	r11,8(r12)
	mtspr	SRR1,r11

	addi	r12,r12,12		/* Adjust stack pointer */
	li	r20,0xd00-4
	stw	r12,0(r20)

	SYNC
	rfi
_end_back:

	STD_EXCEPTION(0xd00, SingleStep, UnknownException)

	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
	STD_EXCEPTION(0xf00, Trap_0f, UnknownException)

	STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
	STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
	STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
#ifdef DEBUG
	. = 0x1300
	/*
	 * This exception occurs when the program counter matches the
	 * Instruction Address Breakpoint Register (IABR).
	 *
	 * I want the cpu to halt if this occurs so I can hunt around
	 * with the debugger and look at things.
	 *
	 * When DEBUG is defined, both machine check enable (in the MSR)
	 * and checkstop reset enable (in the reset mode register) are
	 * turned off and so a checkstop condition will result in the cpu
	 * halting.
	 *
	 * I force the cpu into a checkstop condition by putting an illegal
	 * instruction here (at least this is the theory).
	 *
	 * well - that didnt work, so just do an infinite loop!
	 */
1:	b	1b
#else
	STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
#endif
	STD_EXCEPTION(0x1400, SMI, UnknownException)

	STD_EXCEPTION(0x1500, Trap_15, UnknownException)
	STD_EXCEPTION(0x1600, Trap_16, UnknownException)
	STD_EXCEPTION(0x1700, Trap_17, UnknownException)
	STD_EXCEPTION(0x1800, Trap_18, UnknownException)
	STD_EXCEPTION(0x1900, Trap_19, UnknownException)
	STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
	STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
	STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
	STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
	STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
	STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
	STD_EXCEPTION(0x2000, Trap_20, UnknownException)
	STD_EXCEPTION(0x2100, Trap_21, UnknownException)
	STD_EXCEPTION(0x2200, Trap_22, UnknownException)
	STD_EXCEPTION(0x2300, Trap_23, UnknownException)
	STD_EXCEPTION(0x2400, Trap_24, UnknownException)
	STD_EXCEPTION(0x2500, Trap_25, UnknownException)
	STD_EXCEPTION(0x2600, Trap_26, UnknownException)
	STD_EXCEPTION(0x2700, Trap_27, UnknownException)
	STD_EXCEPTION(0x2800, Trap_28, UnknownException)
	STD_EXCEPTION(0x2900, Trap_29, UnknownException)
	STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
	STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
	STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
	STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
	STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
	STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)


	.globl	_end_of_vectors
_end_of_vectors:

	. = 0x3000

/*
 * This code finishes saving the registers to the exception frame
 * and jumps to the appropriate handler for the exception.
 * Register r21 is pointer into trap frame, r1 has new stack pointer.
 */
	.globl	transfer_to_handler
transfer_to_handler:
	stw	r22,_NIP(r21)
	lis	r22,MSR_POW@h
	andc	r23,r23,r22
	stw	r23,_MSR(r21)
	SAVE_GPR(7, r21)
	SAVE_4GPRS(8, r21)
	SAVE_8GPRS(12, r21)
	SAVE_8GPRS(24, r21)
	mflr	r23
	andi.	r24,r23,0x3f00		/* get vector offset */
	stw	r24,TRAP(r21)
	li	r22,0
	stw	r22,RESULT(r21)
	lwz	r24,0(r23)		/* virtual address of handler */
	lwz	r23,4(r23)		/* where to go when done */
	mtspr	SRR0,r24
	mtspr	SRR1,r20
	mtlr	r23
	SYNC
	rfi				/* jump to handler, enable MMU */

int_return:
	mfmsr	r28		/* Disable interrupts */
	li	r4,0
	ori	r4,r4,MSR_EE
	andc	r28,r28,r4
	SYNC			/* Some chip revs need this... */
	mtmsr	r28
	SYNC
	lwz	r2,_CTR(r1)
	lwz	r0,_LINK(r1)
	mtctr	r2
	mtlr	r0
	lwz	r2,_XER(r1)
	lwz	r0,_CCR(r1)
	mtspr	XER,r2
	mtcrf	0xFF,r0
	REST_10GPRS(3, r1)
	REST_10GPRS(13, r1)
	REST_8GPRS(23, r1)
	REST_GPR(31, r1)
	lwz	r2,_NIP(r1)	/* Restore environment */
	lwz	r0,_MSR(r1)
	mtspr	SRR0,r2
	mtspr	SRR1,r0
	lwz	r0,GPR0(r1)
	lwz	r2,GPR2(r1)
	lwz	r1,GPR1(r1)
	SYNC
	rfi

#if defined(CONFIG_COGENT)

/*
 * This code initialises the MPC8260 processor core
 * (conforms to PowerPC 603e spec)
 */

	.globl	cogent_init_8260
cogent_init_8260:

	/* Taken from page 14 of CMA282 manual				*/
	/*--------------------------------------------------------------*/

	lis	r4, (CFG_IMMR+IM_REGBASE)@h
	lis	r3, CFG_IMMR@h
	stw	r3, IM_IMMR@l(r4)
	lwz	r3, IM_IMMR@l(r4)
	stw	r3, 0(r0)
	lis	r3, CFG_SYPCR@h
	ori	r3, r3, CFG_SYPCR@l
	stw	r3, IM_SYPCR@l(r4)
	lwz	r3, IM_SYPCR@l(r4)
	stw	r3, 4(r0)
	lis	r3, CFG_SCCR@h
	ori	r3, r3, CFG_SCCR@l
	stw	r3, IM_SCCR@l(r4)
	lwz	r3, IM_SCCR@l(r4)
	stw	r3, 8(r0)

	/* the rest of this was disassembled from the			*/
	/* EPROM code that came with my CMA282 CPU module		*/
	/*--------------------------------------------------------------*/

	lis	r1, 0x1234
	ori	r1, r1, 0x5678
	stw	r1, 0x20(r0)
	lwz	r1, 0x20(r0)
	stw	r1, 0x24(r0)
	lwz	r1, 0x24(r0)
	lis	r3, 0x0e80
	ori	r3, r3, 0
	stw	r1, 4(r3)
	lwz	r1, 4(r3)

	/* Done!							*/
	/*--------------------------------------------------------------*/

	blr

#endif	/* CONFIG_COGENT */

/*
 * This code initialises the MPC8260 processor core
 * (conforms to PowerPC 603e spec)
 * Note: expects original MSR contents to be in r5.
 */

	.globl	init_8260_core
init_8260_core:

	/* 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 */

	/* Initialise the SYPCR early, and reset the watchdog (if req)	*/
	/*--------------------------------------------------------------*/

	lis	r3, (CFG_IMMR+IM_REGBASE)@h
#if !defined(CONFIG_COGENT)
	lis	r4, CFG_SYPCR@h
	ori	r4, r4, CFG_SYPCR@l
	stw	r4, IM_SYPCR@l(r3)
#endif /* !CONFIG_COGENT */
#if defined(CONFIG_WATCHDOG)
	li	r4, 21868		/* = 0x556c */
	sth	r4, IM_SWSR@l(r3)
	li	r4, -21959		/* = 0xaa39 */
	sth	r4, IM_SWSR@l(r3)
#endif /* CONFIG_WATCHDOG */

	/* Initialize the Hardware Implementation-dependent Registers	*/
	/* HID0 also contains cache control				*/
	/*--------------------------------------------------------------*/

	lis	r3, CFG_HID0_INIT@h
	ori	r3, r3, CFG_HID0_INIT@l
	SYNC
	mtspr	HID0, r3

	lis	r3, CFG_HID0_FINAL@h
	ori	r3, r3, CFG_HID0_FINAL@l
	SYNC
	mtspr	HID0, r3

	lis	r3, CFG_HID2@h
	ori	r3, r3, CFG_HID2@l
	mtspr	HID2, r3

	/* clear all BAT's						*/
	/*--------------------------------------------------------------*/

	li	r0, 0
	mtspr	DBAT0U, r0
	mtspr	DBAT0L, r0
	mtspr	DBAT1U, r0
	mtspr	DBAT1L, r0
	mtspr	DBAT2U, r0
	mtspr	DBAT2L, r0
	mtspr	DBAT3U, r0
	mtspr	DBAT3L, r0
	mtspr	IBAT0U, r0
	mtspr	IBAT0L, r0
	mtspr	IBAT1U, r0
	mtspr	IBAT1L, r0
	mtspr	IBAT2U, r0
	mtspr	IBAT2L, r0
	mtspr	IBAT3U, r0
	mtspr	IBAT3L, r0
	SYNC

	/* 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/ppc/kernel/head.S	*/
	/*								*/
	/*--------------------------------------------------------------*/

	li	r3, 32
	mtctr	r3
	li	r3, 0
1:	tlbie	r3
	addi	r3, r3, 0x1000
	bdnz	1b
	SYNC

	/* Done!							*/
	/*--------------------------------------------------------------*/

	blr

#ifdef DEBUG

/*
 * initialise things related to debugging.
 *
 * must be called after the global offset table (GOT) is initialised
 * (GET_GOT) and after cpu_init_f() has executed.
 */

	.globl	init_debug
init_debug:

	lis	r3, (CFG_IMMR+IM_REGBASE)@h

	/* Quick and dirty hack to enable the RAM and copy the		*/
	/* vectors so that we can take exceptions.			*/
	/*--------------------------------------------------------------*/
	/* write Memory Refresh Prescaler */
	li	r4, CFG_MPTPR
	sth	r4, IM_MPTPR@l(r3)
	/* write 60x Refresh Timer */
	li	r4, CFG_PSRT
	stb	r4, IM_PSRT@l(r3)
	/* init the 60x SDRAM Mode Register */
	lis	r4, (CFG_PSDMR|PSDMR_OP_NORM)@h
	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_NORM)@l
	stw	r4, IM_PSDMR@l(r3)
	/* write Precharge All Banks command */
	lis	r4, (CFG_PSDMR|PSDMR_OP_PREA)@h
	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_PREA)@l
	stw	r4, IM_PSDMR@l(r3)
	stb	r0, 0(0)
	/* write eight CBR Refresh commands */
	lis	r4, (CFG_PSDMR|PSDMR_OP_CBRR)@h
	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_CBRR)@l
	stw	r4, IM_PSDMR@l(r3)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	stb	r0, 0(0)
	/* write Mode Register Write command */
	lis	r4, (CFG_PSDMR|PSDMR_OP_MRW)@h
	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_MRW)@l
	stw	r4, IM_PSDMR@l(r3)
	stb	r0, 0(0)
	/* write Normal Operation command and enable Refresh */
	lis	r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h
	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l
	stw	r4, IM_PSDMR@l(r3)
	stb	r0, 0(0)
	/* RAM should now be operational */

#define VEC_WRD_CNT	((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)

	lwz	r3, GOT(_end_of_vectors)
	rlwinm	r4, r3, 0, 18, 31	/* _end_of_vectors & 0x3FFF	*/
	lis	r5, VEC_WRD_CNT@h
	ori	r5, r5, VEC_WRD_CNT@l
	mtctr	r5
1:
	lwzu	r5, -4(r3)
	stwu	r5, -4(r4)
	bdnz	1b

	/* Load the Instruction Address Breakpoint Register (IABR).	*/
	/* 								*/
	/* The address to load is stored in the first word of dual port	*/
	/* ram and should be preserved while the power is on, so you	*/
	/* can plug addresses into that location then reset the cpu and	*/
	/* this code will load that address into the IABR after the	*/
	/* reset.							*/
	/* 								*/
	/* When the program counter matches the contents of the IABR,	*/
	/* an exception is generated (before the instruction at that	*/
	/* location completes). The vector for this exception is 0x1300 */
	/*--------------------------------------------------------------*/
	lis	r3, CFG_IMMR@h
	lwz	r3, 0(r3)
	mtspr	IABR, r3

	/* Set the entire dual port RAM (where the initial stack	*/
	/* resides) to a known value - makes it easier to see where	*/
	/* the stack has been written					*/
	/*--------------------------------------------------------------*/
	lis	r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@h
	ori	r3, r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@l
	li	r4, ((CFG_INIT_SP_OFFSET - 4) / 4)
	mtctr	r4
	lis	r4, 0xdeadbeaf@h
	ori	r4, r4, 0xdeadbeaf@l
1:
	stwu	r4, -4(r3)
	bdnz	1b

	/* Done!							*/
	/*--------------------------------------------------------------*/

	blr
#endif

/* Cache functions.
 *
 * Note: requires that all cache bits in
 * HID0 are in the low half word.
 */
	.globl	icache_enable
icache_enable:
	mfspr	r3, HID0
	ori	r3, r3, HID0_ICE
	lis	r4, 0
	ori	r4, r4, 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_ILOCK
	andc	r3, r3, r4
	ori	r4, r3, HID0_ICFI
	isync
	mtspr	HID0, r4	/* sets invalidate, clears enable and lock */
	isync
	mtspr	HID0, r3	/* clears invalidate */
	blr

	.globl	icache_status
icache_status:
	mfspr	r3, HID0
	rlwinm	r3, r3, HID0_ICE_BITPOS + 1, 31, 31
	blr

	.globl	dcache_enable
dcache_enable:
	mfspr	r3, HID0
	ori	r3, r3, HID0_DCE
	lis	r4, 0
	ori	r4, r4, HID0_DLOCK
	andc	r3, r3, r4
	ori	r4, r3, HID0_DCI
	sync
	mtspr	HID0, r4	/* sets enable and invalidate, clears lock */
	sync
	mtspr	HID0, r3	/* clears invalidate */
	blr

	.globl	dcache_disable
dcache_disable:
	mfspr	r3, HID0
	lis	r4, 0
	ori	r4, r4, HID0_DCE|HID0_DLOCK
	andc	r3, r3, r4
	ori	r4, r3, HID0_DCI
	sync
	mtspr	HID0, r4	/* sets invalidate, clears enable and lock */
	sync
	mtspr	HID0, r3	/* clears invalidate */
	blr

	.globl	dcache_status
dcache_status:
	mfspr	r3, HID0
	rlwinm	r3, r3, HID0_DCE_BITPOS + 1, 31, 31
	blr

	.globl get_pvr
get_pvr:
	mfspr	r3, PVR
	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	*/

	mr	r3,  r5				/* Destination Address	*/
	lis	r4, CFG_MONITOR_BASE@h		/* Source      Address	*/
	ori	r4, r4, CFG_MONITOR_BASE@l
	lis	r5, CFG_MONITOR_LEN@h		/* Length in Bytes	*/
	ori	r5, r5, CFG_MONITOR_LEN@l
	li	r6, CFG_CACHELINE_SIZE		/* Cache Line Size	*/

	/*
	 * Fix GOT pointer:
	 *
	 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
	 *
	 * Offset:
	 */
	sub	r15, r10, r4

	/* First our own GOT */
	add	r14, r14, 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)
1:	lwzu	r0,4(r8)
	stwu	r0,4(r7)
	bdnz	1b
	b	4f

2:	slwi	r0,r0,2
	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
	mfspr	r7,HID0		/* don't do dcbst if dcache is disabled */
	rlwinm	r7,r7,HID0_DCE_BITPOS+1,31,31
	cmpwi	r7,0
	beq	9f
	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 */
9:	mfspr	r7,HID0		/* don't do icbi if icache is disabled */
	rlwinm	r7,r7,HID0_ICE_BITPOS+1,31,31
	cmpwi	r7,0
	beq	7f
	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, r14 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)
	add	r0,r0,r11
	stw	r0,0(r3)
	bdnz	1b

	/*
         * Now adjust the fixups and the pointers to the fixups
	 * in case we need to move ourselves again.
	 */
2:	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
	add	r0,r0,r11
	stw	r10,0(r3)
	stw	r0,0(r4)
	bdnz	3b
4:
clear_bss:
	/*
	 * Now clear BSS segment
	 */
	lwz	r3,GOT(__bss_start)
#if defined(CONFIG_HYMOD)
	/*
	 * For HYMOD - the environment is the very last item in flash.
	 * The real .bss stops just before environment starts, so only
	 * clear up to that point.
	 *
	 * taken from mods for FADS board
	 */
	lwz	r4,GOT(environment)
#else
	lwz	r4,GOT(_end)
#endif

	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

	/* Problems accessing "end" in C, so do it here */
	.globl	get_endaddr
get_endaddr:
	lwz	r3,GOT(_end)
	blr

	/*
	 * Copy exception vector code to low memory
	 *
	 * r3: dest_addr
	 * r7: source address, r8: end address, r9: target address
	 */
	.globl	trap_init
trap_init:
	lwz	r7, GOT(_start)
	lwz	r8, GOT(_end_of_vectors)

	rlwinm	r9, r7, 0, 18, 31	/* _start & 0x3FFF	*/

	cmplw	0, r7, r8
	bgelr				/* return if r7>=r8 - just in case */

	mflr	r4			/* save link register		*/
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

	/*
	 * Function: relocate entries for one exception vector
	 */
trap_reloc:
	lwz	r0, 0(r7)		/* hdlr ...			*/
	add	r0, r0, r3		/*  ... += dest_addr		*/
	stw	r0, 0(r7)

	lwz	r0, 4(r7)		/* int_return ...		*/
	add	r0, r0, r3		/*  ... += dest_addr		*/
	stw	r0, 4(r7)

	blr