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 * SPDX-License-Identifier: GPL-2.0+
13 * Discription: startup code
17 #include <asm-offsets.h>
22 #include <ppc_asm.tmpl>
25 #include <asm/processor.h>
26 #include <asm/u-boot.h>
28 /* We don't have a MMU.
31 #define MSR_KERNEL ( MSR_ME | MSR_RI ) /* Machine Check and Recoverable Interr. */
34 * Set up GOT: Global Offset Table
36 * Use r12 to access the GOT
39 GOT_ENTRY(_GOT2_TABLE_)
40 GOT_ENTRY(_FIXUP_TABLE_)
43 GOT_ENTRY(_start_of_vectors)
44 GOT_ENTRY(_end_of_vectors)
45 GOT_ENTRY(transfer_to_handler)
49 GOT_ENTRY(__bss_start)
53 * r3 - 1st arg to board_init(): IMMP pointer
54 * r4 - 2nd arg to board_init(): boot flag
57 .long 0x27051956 /* U-Boot Magic Number */
60 .ascii U_BOOT_VERSION_STRING, "\0"
66 li r4, CONFIG_SYS_ISB /* Set ISB bit */
70 /* Initialize machine status; enable machine check interrupt */
71 /*----------------------------------------------------------------------*/
72 li r3, MSR_KERNEL /* Set ME, RI flags */
74 mtspr SRR1, r3 /* Make SRR1 match MSR */
76 /* Initialize debug port registers */
77 /*----------------------------------------------------------------------*/
78 xor r0, r0, r0 /* Clear R0 */
79 mtspr LCTRL1, r0 /* Initialize debug port regs */
84 #if defined(CONFIG_PATI)
85 /* the external flash access on PATI fails if programming the PLL to 40MHz.
86 * Copy the PLL programming code to the internal RAM and execute it
87 *----------------------------------------------------------------------*/
88 lis r3, CONFIG_SYS_MONITOR_BASE@h
89 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
90 addi r3, r3, pll_prog_code_start - _start + EXC_OFF_SYS_RESET
92 lis r4, CONFIG_SYS_INIT_RAM_ADDR@h
93 ori r4, r4, CONFIG_SYS_INIT_RAM_ADDR@l
96 ori r5,r5,((pll_prog_code_end - pll_prog_code_start) >>2)
103 bdnz 0b /* copy loop */
108 * Calculate absolute address in FLASH and jump there
109 *----------------------------------------------------------------------*/
111 lis r3, CONFIG_SYS_MONITOR_BASE@h
112 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
113 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
119 /* Initialize some SPRs that are hard to access from C */
120 /*----------------------------------------------------------------------*/
122 lis r3, CONFIG_SYS_IMMR@h /* Pass IMMR as arg1 to C routine */
123 lis r2, CONFIG_SYS_INIT_SP_ADDR@h
124 ori r1, r2, CONFIG_SYS_INIT_SP_ADDR@l /* Set up the stack in internal SRAM */
125 /* Note: R0 is still 0 here */
126 stwu r0, -4(r1) /* Clear final stack frame so that */
127 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
130 * Disable serialized ifetch and show cycles
131 * (i.e. set processor to normal mode) for maximum
138 /* Set up debug mode entry */
140 lis r2, CONFIG_SYS_DER@h
141 ori r2, r2, CONFIG_SYS_DER@l
144 /* Let the C-code set up the rest */
146 /* Be careful to keep code relocatable ! */
147 /*----------------------------------------------------------------------*/
149 GET_GOT /* initialize GOT access */
152 bl cpu_init_f /* run low-level CPU init code (from Flash) */
154 bl board_init_f /* run 1st part of board init code (from Flash) */
156 /* NOTREACHED - board_init_f() does not return */
159 .globl _start_of_vectors
163 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
165 /* Data Storage exception. "Never" generated on the 860. */
166 STD_EXCEPTION(0x300, DataStorage, UnknownException)
168 /* Instruction Storage exception. "Never" generated on the 860. */
169 STD_EXCEPTION(0x400, InstStorage, UnknownException)
171 /* External Interrupt exception. */
172 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
174 /* Alignment exception. */
177 EXCEPTION_PROLOG(SRR0, SRR1)
182 addi r3,r1,STACK_FRAME_OVERHEAD
183 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
185 /* Program check exception */
188 EXCEPTION_PROLOG(SRR0, SRR1)
189 addi r3,r1,STACK_FRAME_OVERHEAD
190 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
193 /* FPU on MPC5xx available. We will use it later.
195 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
197 /* I guess we could implement decrementer, and may have
198 * to someday for timekeeping.
200 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
201 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
202 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
203 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
204 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
206 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
207 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
209 /* On the MPC8xx, this is a software emulation interrupt. It occurs
210 * for all unimplemented and illegal instructions.
212 STD_EXCEPTION(0x1000, SoftEmu, SoftEmuException)
213 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
214 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
215 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
216 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
218 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
219 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
220 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
221 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
222 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
223 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
224 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
226 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
227 STD_EXCEPTION(0x1d00, InstructionBreakpoint, DebugException)
228 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
229 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
232 .globl _end_of_vectors
239 * This code finishes saving the registers to the exception frame
240 * and jumps to the appropriate handler for the exception.
241 * Register r21 is pointer into trap frame, r1 has new stack pointer.
243 .globl transfer_to_handler
254 andi. r24,r23,0x3f00 /* get vector offset */
258 mtspr SPRG2,r22 /* r1 is now kernel sp */
259 lwz r24,0(r23) /* virtual address of handler */
260 lwz r23,4(r23) /* where to go when done */
265 rfi /* jump to handler, enable MMU */
268 mfmsr r28 /* Disable interrupts */
272 SYNC /* Some chip revs need this... */
287 lwz r2,_NIP(r1) /* Restore environment */
299 * unsigned int get_immr (unsigned int mask)
301 * return (mask ? (IMMR & mask) : IMMR);
305 mr r4,r3 /* save mask */
306 mfspr r3, IMMR /* IMMR */
307 cmpwi 0,r4,0 /* mask != 0 ? */
309 and r3,r3,r4 /* IMMR & mask */
319 /*------------------------------------------------------------------------------*/
322 * void relocate_code (addr_sp, gd, addr_moni)
324 * This "function" does not return, instead it continues in RAM
325 * after relocating the monitor code.
329 * r5 = length in bytes
334 mr r1, r3 /* Set new stack pointer in SRAM */
335 mr r9, r4 /* Save copy of global data pointer in SRAM */
336 mr r10, r5 /* Save copy of monitor destination Address in SRAM */
339 mr r3, r5 /* Destination Address */
340 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
341 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
342 lwz r5, GOT(__init_end)
348 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
354 /* First our own GOT */
356 /* the the one used by the C code */
366 beq cr1,4f /* In place copy is not necessary */
367 beq 4f /* Protect against 0 count */
389 * We are done. Do not return, instead branch to second part of board
390 * initialization, now running from RAM.
393 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
400 * Relocation Function, r12 point to got2+0x8000
402 * Adjust got2 pointers, no need to check for 0, this code
403 * already puts a few entries in the table.
405 li r0,__got2_entries@sectoff@l
406 la r3,GOT(_GOT2_TABLE_)
407 lwz r11,GOT(_GOT2_TABLE_)
419 * Now adjust the fixups and the pointers to the fixups
420 * in case we need to move ourselves again.
422 li r0,__fixup_entries@sectoff@l
423 lwz r3,GOT(_FIXUP_TABLE_)
439 * Now clear BSS segment
441 lwz r3,GOT(__bss_start)
442 lwz r4,GOT(__bss_end)
454 mr r3, r9 /* Global Data pointer */
455 mr r4, r10 /* Destination Address */
459 * Copy exception vector code to low memory
462 * r7: source address, r8: end address, r9: target address
466 mflr r4 /* save link register */
469 lwz r8, GOT(_end_of_vectors)
471 li r9, 0x100 /* reset vector always at 0x100 */
474 bgelr /* return if r7>=r8 - just in case */
484 * relocate `hdlr' and `int_return' entries
486 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
487 li r8, Alignment - _start + EXC_OFF_SYS_RESET
490 addi r7, r7, 0x100 /* next exception vector */
494 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
497 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
500 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
501 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
504 addi r7, r7, 0x100 /* next exception vector */
508 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
509 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
512 addi r7, r7, 0x100 /* next exception vector */
516 mtlr r4 /* restore link register */
519 #if defined(CONFIG_PATI)
520 /* Program the PLL */
522 lis r4, (CONFIG_SYS_IMMR + 0x002fc384)@h
523 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc384)@l
524 lis r3, (0x55ccaa33)@h
525 ori r3, r3, (0x55ccaa33)@l
527 lis r4, (CONFIG_SYS_IMMR + 0x002fc284)@h
528 ori r4, r4, (CONFIG_SYS_IMMR + 0x002fc284)@l
529 lis r3, CONFIG_SYS_PLPRCR@h
530 ori r3, r3, CONFIG_SYS_PLPRCR@l
536 bdnz ..spinlp /* spin loop */