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Diffstat (limited to 'cpu/mpc83xx/start.S')
| -rw-r--r-- | cpu/mpc83xx/start.S | 1093 |
1 files changed, 1093 insertions, 0 deletions
diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S new file mode 100644 index 0000000..fb001a6 --- /dev/null +++ b/cpu/mpc83xx/start.S @@ -0,0 +1,1093 @@ +/* + * 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> + * Copyright 2004 Freescale Semiconductor, Inc. + * + * 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 MPC83xx PowerPC based Embedded Boards + */ + +#include <config.h> +#include <mpc83xx.h> +#include <version.h> + +#define CONFIG_83XX 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 "MPC83XX" +#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(__init_end) + GOT_ENTRY(_end) + GOT_ENTRY(__bss_start) + END_GOT + +/* + * Version string - must be in data segment because MPC83xx 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" + + .text +#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) + + _HRCW_TABLE_ENTRY(CFG_HRCW_LOW) + _HRCW_TABLE_ENTRY(CFG_HRCW_HIGH) + + +#ifndef CONFIG_DEFAULT_IMMR +#error CONFIG_DEFAULT_IMMR must be defined +#endif /* CFG_DEFAULT_IMMR */ +#ifndef CFG_IMMRBAR +#define CFG_IMMRBAR CONFIG_DEFAULT_IMMR +#endif /* CFG_IMMRBAR */ + +/* + * 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: /* time t 0 */ + li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH*/ + nop + b boot_cold + + . = EXC_OFF_SYS_RESET + 0x10 + + .globl _start_warm +_start_warm: + li r21, BOOTFLAG_WARM /* Software reboot */ + b boot_warm + + +boot_cold: /* time t 3 */ + lis r4, CONFIG_DEFAULT_IMMR@h + nop +boot_warm: /* time t 5 */ + mfmsr r5 /* save msr contents */ + lis r3, CFG_IMMRBAR@h + ori r3, r3, CFG_IMMRBAR@l + stw r3, IMMRBAR(r4) + + /* Initialise the E300 processor core */ + /*------------------------------------------*/ + + bl init_e300_core + +#ifndef CFG_RAMBOOT + + /* Inflate flash location so it appears everywhere, calculate */ + /* the absolute address in final location of the FLASH, jump */ + /* there and deflate the flash size back to minimal size */ + /*------------------------------------------------------------*/ + bl map_flash_by_law1 + lis r4, (CFG_MONITOR_BASE)@h + ori r4, r4, (CFG_MONITOR_BASE)@l + addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET + mtlr r5 + blr +in_flash: +#if 1 /* Remapping flash with LAW0. */ + bl remap_flash_by_law0 +#endif +#endif /* CFG_RAMBOOT */ + + bl setup_stack_in_data_cache_on_r1 + + /* let the C-code set up the rest */ + /* */ + /* Be careful to keep code relocatable & stack humble */ + /*------------------------------------------------------*/ + + GET_GOT /* initialize GOT access */ + + /* r3: IMMR */ + lis r3, CFG_IMMRBAR@h + /* run low-level CPU init code (in Flash)*/ + bl cpu_init_f + + /* r3: BOOTFLAG */ + mr r3, r21 + /* run 1st part of board init code (in Flash)*/ + bl board_init_f + +/* + * 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. */ +#ifndef FIXME + STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt) +#endif + +/* 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) + STD_EXCEPTION(0xc00, SystemCall, UnknownException) + 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 + +/* + * 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, CFG_IMMRBAR@h +#if defined(CONFIG_WATCHDOG) + /* Initialise the Wathcdog values and reset it (if req) */ + /*------------------------------------------------------*/ + lis r4, CFG_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, 0xAA39 + sth r4, SWSRR@l(r3) +#else + /* Disable Wathcdog */ + /*-------------------*/ + xor r4, r4, r4 + stw r4, SWCRR(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 + SYNC + mtspr HID2, r3 + + /* clear all BAT's */ + /*----------------------------------*/ + + xor r0, r0, r0 + 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 + +/* 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_SHIFT, 31, 31 + blr + + .globl dcache_enable +dcache_enable: + mfspr r3, HID0 + ori r3, r3, HID0_ENABLE_DATA_CACHE + lis r4, 0 + ori r4, r4, HID0_LOCK_DATA_CACHE + andc r3, r3, r4 + ori r4, r3, HID0_LOCK_INSTRUCTION_CACHE + 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_ENABLE_DATA_CACHE|HID0_LOCK_DATA_CACHE + andc r3, r3, r4 + ori r4, r3, HID0_INVALIDATE_DATA_CACHE + 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_SHIFT, 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 + lwz r5, GOT(__init_end) + sub r5, r5, r4 + 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) + + /* 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: + bl un_setup_stack_in_data_cache + mr r7, r3 + mr r8, r4 + bl dcache_disable + mr r3, r7 + mr r4, r8 + + 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_SHIFT,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_DCE_SHIFT,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 + + /* + * 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) + + li r9, 0x100 /* reset vector always at 0x100 */ + + 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 + +#ifdef CFG_INIT_RAM_LOCK +.globl unlock_ram_in_cache +unlock_ram_in_cache: + /* invalidate the INIT_RAM section */ + lis r3, (CFG_INIT_RAM_ADDR & ~31)@h + ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l + li r2,512 + mtctr r2 +1: icbi r0, r3 + dcbi r0, r3 + addi r3, r3, 32 + bdnz 1b + sync /* Wait for all icbi to complete on bus */ + isync + blr +#endif + +map_flash_by_law1: + /* When booting from ROM (Flash or EPROM), clear the */ + /* Address Mask in OR0 so ROM appears everywhere */ + /*----------------------------------------------------*/ + lis r3, (CFG_IMMRBAR)@h /* r3 <= CFG_IMMRBAR */ + 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, (CFG_FLASH_BASE)@h + ori r4, r4, (CFG_FLASH_BASE)@l + stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CFG_FLASH_BASE */ + lis r4, (0x80000016)@h + ori r4, r4, (0x80000016)@l + stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */ + 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, (CFG_FLASH_BASE & 0xFFFF8000)@h + ori r5, r5, (CFG_FLASH_BASE & 0xFFFF8000)@l + or r5, r5, r4 + stw r5, BR0(r3) /* r5 <= (CFG_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */ + + lwz r4, OR0(r3) + lis r5, 0xFF80 /* 8M */ + or r4, r4, r5 + stw r4, OR0(r3) /* OR0 <= OR0 | 0xFF800000 */ + + lis r4, (CFG_FLASH_BASE)@h + ori r4, r4, (CFG_FLASH_BASE)@l + stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CFG_FLASH_BASE */ + + lis r4, (0x80000016)@h + ori r4, r4, (0x80000016)@l + stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= 8MB Flash Size */ + + xor r4, r4, r4 + stw r4, LBLAWBAR1(r3) + stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */ + blr + +setup_stack_in_data_cache_on_r1: + lis r3, (CFG_IMMRBAR)@h + + /* setup D-BAT for the D-Cache (with out real memory backup) */ + + lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h + mtspr DBAT0U, r4 + ori r4, r4, 0x0002 + mtspr DBAT0L, r4 + isync + +#if 0 + /* Enable MMU */ + mfmsr r4 + ori r4, r4, (MSR_DR | MSR_IR)@l + mtmsr r4 +#endif + + /* Enable and invalidate data cache. */ + mfspr r4, HID0 + mr r5, r4 + ori r4, r4, HID0_DCE | HID0_DCI + ori r5, r5, HID0_DCE + sync + mtspr HID0, r4 + mtspr HID0, r5 + sync + + /* Allocate Initial RAM in data cache.*/ + li r0, 0 + lis r4, (CFG_INIT_RAM_ADDR)@h + ori r4, r4, (CFG_INIT_RAM_ADDR)@l + li r5, 128*8 /* 128*8*32=32Kb */ + mtctr r5 +1: + dcbz r0, r4 + addi r4, r4, 32 + bdnz 1b + isync + + /* Lock all the D-cache, basically leaving the reset of the program without dcache */ + mfspr r4, HID0 + ori r4, r4, (HID0_DLOCK)@l + sync + mtspr HID0 , r4 + + /* setup the stack pointer in r1 */ + lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h + ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l + 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 */ + + blr + +un_setup_stack_in_data_cache: + blr + mr r14, r4 + mr r15, r5 + + + lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h + mtspr DBAT0U, r4 + ori r4, r4, 0x0002 + mtspr DBAT0L, r4 + isync + + /* un lock all the D-cache */ + mfspr r4, HID0 + lis r5, (~(HID0_DLOCK))@h + ori r5, r5, (~(HID0_DLOCK))@l + and r4, r4, r5 + sync + mtspr HID0 , r4 + + /* Re - Allocate Initial RAM in data cache.*/ + li r0, 0 + lis r4, (CFG_INIT_RAM_ADDR)@h + ori r4, r4, (CFG_INIT_RAM_ADDR)@l + li r5, 128*8 /* 128*8*32=32Kb */ + mtctr r5 +1: + dcbz r0, r4 + addi r4, r4, 32 + bdnz 1b + isync + + mflr r16 + bl dcache_disable + mtlr r16 + + blr + +#if 0 +#define GREEN_LIGHT 0x2B0D4046 +#define RED_LIGHT 0x250D4046 +#define LIB_CNT 0x4FFF + +/* + * Lib Light + */ + + .globl liblight +liblight: + lis r3, CFG_IMMRBAR@h + ori r3, r3, CFG_IMMRBAR@l + li r4, 0x3002 + mtmsr r4 + xor r4, r4, r4 + mtspr HID0, r4 + mtspr HID2, r4 + lis r4, 0xF8000000@h + ori r4, r4, 0xF8000000@l + stw r4, LBLAWBAR1(r3) + lis r4, 0x8000000E@h + ori r4, r4, 0x8000000E@l + stw r4, LBLAWAR1(r3) + lis r4, 0xF8000801@h + ori r4, r4, 0xF8000801@l + stw r4, BR1(r3) + lis r4, 0xFFFFE8f0@h + ori r4, r4, 0xFFFFE8f0@l + stw r4, OR1(r3) + + lis r4, 0xF8000000@h + ori r4, r4, 0xF8000000@l + lis r5, GREEN_LIGHT@h + ori r5, r5, GREEN_LIGHT@l + lis r6, RED_LIGHT@h + ori r6, r6, RED_LIGHT@l + lis r7, LIB_CNT@h + ori r7, r7, LIB_CNT@l + +1: + stw r5, 0(r4) + mtctr r7 +2: bdnz 2b + stw r6, 0(r4) + mtctr r7 +3: bdnz 3b + b 1b + +#endif |