2 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
4 * Copyright (C) 2000, 2001, 2002 Wolfgang Denk <wd@denx.de>
5 * Copyright (C) 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * Discription: startup code
33 #include <asm-offsets.h>
38 #define CONFIG_5xx 1 /* needed for Linux kernel header files */
39 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
41 #include <ppc_asm.tmpl>
44 #include <linux/config.h>
45 #include <asm/processor.h>
46 #include <asm/u-boot.h>
48 /* We don't have a MMU.
51 #define MSR_KERNEL ( MSR_ME | MSR_RI ) /* Machine Check and Recoverable Interr. */
54 * Set up GOT: Global Offset Table
56 * Use r12 to access the GOT
59 GOT_ENTRY(_GOT2_TABLE_)
60 GOT_ENTRY(_FIXUP_TABLE_)
63 GOT_ENTRY(_start_of_vectors)
64 GOT_ENTRY(_end_of_vectors)
65 GOT_ENTRY(transfer_to_handler)
68 GOT_ENTRY(__bss_end__)
69 GOT_ENTRY(__bss_start)
73 * r3 - 1st arg to board_init(): IMMP pointer
74 * r4 - 2nd arg to board_init(): boot flag
77 .long 0x27051956 /* U-Boot Magic Number */
80 .ascii U_BOOT_VERSION_STRING, "\0"
86 li r4, CONFIG_SYS_ISB /* Set ISB bit */
90 /* Initialize machine status; enable machine check interrupt */
91 /*----------------------------------------------------------------------*/
92 li r3, MSR_KERNEL /* Set ME, RI flags */
94 mtspr SRR1, r3 /* Make SRR1 match MSR */
96 /* Initialize debug port registers */
97 /*----------------------------------------------------------------------*/
98 xor r0, r0, r0 /* Clear R0 */
99 mtspr LCTRL1, r0 /* Initialize debug port regs */
104 #if defined(CONFIG_PATI)
105 /* the external flash access on PATI fails if programming the PLL to 40MHz.
106 * Copy the PLL programming code to the internal RAM and execute it
107 *----------------------------------------------------------------------*/
108 lis r3, CONFIG_SYS_MONITOR_BASE@h
109 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
110 addi r3, r3, pll_prog_code_start - _start + EXC_OFF_SYS_RESET
112 lis r4, CONFIG_SYS_INIT_RAM_ADDR@h
113 ori r4, r4, CONFIG_SYS_INIT_RAM_ADDR@l
116 ori r5,r5,((pll_prog_code_end - pll_prog_code_start) >>2)
123 bdnz 0b /* copy loop */
128 * Calculate absolute address in FLASH and jump there
129 *----------------------------------------------------------------------*/
131 lis r3, CONFIG_SYS_MONITOR_BASE@h
132 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
133 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
139 /* Initialize some SPRs that are hard to access from C */
140 /*----------------------------------------------------------------------*/
142 lis r3, CONFIG_SYS_IMMR@h /* Pass IMMR as arg1 to C routine */
143 lis r2, CONFIG_SYS_INIT_SP_ADDR@h
144 ori r1, r2, CONFIG_SYS_INIT_SP_ADDR@l /* Set up the stack in internal SRAM */
145 /* Note: R0 is still 0 here */
146 stwu r0, -4(r1) /* Clear final stack frame so that */
147 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
150 * Disable serialized ifetch and show cycles
151 * (i.e. set processor to normal mode) for maximum
158 /* Set up debug mode entry */
160 lis r2, CONFIG_SYS_DER@h
161 ori r2, r2, CONFIG_SYS_DER@l
164 /* Let the C-code set up the rest */
166 /* Be careful to keep code relocatable ! */
167 /*----------------------------------------------------------------------*/
169 GET_GOT /* initialize GOT access */
172 bl cpu_init_f /* run low-level CPU init code (from Flash) */
174 bl board_init_f /* run 1st part of board init code (from Flash) */
176 /* NOTREACHED - board_init_f() does not return */
179 .globl _start_of_vectors
183 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
185 /* Data Storage exception. "Never" generated on the 860. */
186 STD_EXCEPTION(0x300, DataStorage, UnknownException)
188 /* Instruction Storage exception. "Never" generated on the 860. */
189 STD_EXCEPTION(0x400, InstStorage, UnknownException)
191 /* External Interrupt exception. */
192 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
194 /* Alignment exception. */
197 EXCEPTION_PROLOG(SRR0, SRR1)
202 addi r3,r1,STACK_FRAME_OVERHEAD
203 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
205 /* Program check exception */
208 EXCEPTION_PROLOG(SRR0, SRR1)
209 addi r3,r1,STACK_FRAME_OVERHEAD
210 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
213 /* FPU on MPC5xx available. We will use it later.
215 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
217 /* I guess we could implement decrementer, and may have
218 * to someday for timekeeping.
220 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
221 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
222 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
223 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
224 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
226 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
227 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
229 /* On the MPC8xx, this is a software emulation interrupt. It occurs
230 * for all unimplemented and illegal instructions.
232 STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
233 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
234 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
235 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
236 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
238 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
239 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
240 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
241 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
242 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
243 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
244 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
246 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
247 STD_EXCEPTION(0x1d00, InstructionBreakpoint, DebugException)
248 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
249 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
252 .globl _end_of_vectors
259 * This code finishes saving the registers to the exception frame
260 * and jumps to the appropriate handler for the exception.
261 * Register r21 is pointer into trap frame, r1 has new stack pointer.
263 .globl transfer_to_handler
274 andi. r24,r23,0x3f00 /* get vector offset */
278 mtspr SPRG2,r22 /* r1 is now kernel sp */
279 lwz r24,0(r23) /* virtual address of handler */
280 lwz r23,4(r23) /* where to go when done */
285 rfi /* jump to handler, enable MMU */
288 mfmsr r28 /* Disable interrupts */
292 SYNC /* Some chip revs need this... */
307 lwz r2,_NIP(r1) /* Restore environment */
319 * unsigned int get_immr (unsigned int mask)
321 * return (mask ? (IMMR & mask) : IMMR);
325 mr r4,r3 /* save mask */
326 mfspr r3, IMMR /* IMMR */
327 cmpwi 0,r4,0 /* mask != 0 ? */
329 and r3,r3,r4 /* IMMR & mask */
339 /*------------------------------------------------------------------------------*/
342 * void relocate_code (addr_sp, gd, addr_moni)
344 * This "function" does not return, instead it continues in RAM
345 * after relocating the monitor code.
349 * r5 = length in bytes
354 mr r1, r3 /* Set new stack pointer in SRAM */
355 mr r9, r4 /* Save copy of global data pointer in SRAM */
356 mr r10, r5 /* Save copy of monitor destination Address in SRAM */
359 mr r3, r5 /* Destination Address */
360 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
361 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
362 lwz r5, GOT(__init_end)
368 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
374 /* First our own GOT */
376 /* the the one used by the C code */
386 beq cr1,4f /* In place copy is not necessary */
387 beq 4f /* Protect against 0 count */
409 * We are done. Do not return, instead branch to second part of board
410 * initialization, now running from RAM.
413 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
420 * Relocation Function, r12 point to got2+0x8000
422 * Adjust got2 pointers, no need to check for 0, this code
423 * already puts a few entries in the table.
425 li r0,__got2_entries@sectoff@l
426 la r3,GOT(_GOT2_TABLE_)
427 lwz r11,GOT(_GOT2_TABLE_)
439 * Now adjust the fixups and the pointers to the fixups
440 * in case we need to move ourselves again.
442 li r0,__fixup_entries@sectoff@l
443 lwz r3,GOT(_FIXUP_TABLE_)
459 * Now clear BSS segment
461 lwz r3,GOT(__bss_start)
462 lwz r4,GOT(__bss_end__)
474 mr r3, r9 /* Global Data pointer */
475 mr r4, r10 /* Destination Address */
479 * Copy exception vector code to low memory
482 * r7: source address, r8: end address, r9: target address
486 mflr r4 /* save link register */
489 lwz r8, GOT(_end_of_vectors)
491 li r9, 0x100 /* reset vector always at 0x100 */
494 bgelr /* return if r7>=r8 - just in case */
504 * relocate `hdlr' and `int_return' entries
506 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
507 li r8, Alignment - _start + EXC_OFF_SYS_RESET
510 addi r7, r7, 0x100 /* next exception vector */
514 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
517 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
520 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
521 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
524 addi r7, r7, 0x100 /* next exception vector */
528 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
529 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
532 addi r7, r7, 0x100 /* next exception vector */
536 mtlr r4 /* restore link register */
539 #if defined(CONFIG_PATI)
540 /* Program the PLL */
542 lis r4, (CONFIG_SYS_IMMR + 0x002fc384)@h
543 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc384)@l
544 lis r3, (0x55ccaa33)@h
545 ori r3, r3, (0x55ccaa33)@l
547 lis r4, (CONFIG_SYS_IMMR + 0x002fc284)@h
548 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc284)@l
549 lis r3, CONFIG_SYS_PLPRCR@h
550 ori r3, r3, CONFIG_SYS_PLPRCR@l
556 bdnz ..spinlp /* spin loop */