/* * Copyright 2004, 2007 Freescale Semiconductor. * Copyright (C) 2003 Motorola,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 Motorola 85xx PowerPC based Embedded Boards * * The processor starts at 0xfffffffc and the code is first executed in the * last 4K page(0xfffff000-0xffffffff) in flash/rom. * */ #include <config.h> #include <mpc85xx.h> #include <version.h> #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 #undef MSR_KERNEL #define MSR_KERNEL ( MSR_ME ) /* Machine Check */ /* * 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 /* * e500 Startup -- after reset only the last 4KB of the effective * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg * section is located at THIS LAST page and basically does three * things: clear some registers, set up exception tables and * add more TLB entries for 'larger spaces'(e.g. the boot rom) to * continue the boot procedure. * Once the boot rom is mapped by TLB entries we can proceed * with normal startup. * */ .section .bootpg,"ax" .globl _start_e500 _start_e500: /* clear registers/arrays not reset by hardware */ /* L1 */ li r0,2 mtspr L1CSR0,r0 /* invalidate d-cache */ mtspr L1CSR1,r0 /* invalidate i-cache */ mfspr r1,DBSR mtspr DBSR,r1 /* Clear all valid bits */ /* * Enable L1 Caches early * */ lis r2,L1CSR0_CPE@H /* enable parity */ ori r2,r2,L1CSR0_DCE mtspr L1CSR0,r2 /* enable L1 Dcache */ isync mtspr L1CSR1,r2 /* enable L1 Icache */ isync msync /* Setup interrupt vectors */ lis r1,TEXT_BASE@h mtspr IVPR,r1 li r1,0x0100 mtspr IVOR0,r1 /* 0: Critical input */ li r1,0x0200 mtspr IVOR1,r1 /* 1: Machine check */ li r1,0x0300 mtspr IVOR2,r1 /* 2: Data storage */ li r1,0x0400 mtspr IVOR3,r1 /* 3: Instruction storage */ li r1,0x0500 mtspr IVOR4,r1 /* 4: External interrupt */ li r1,0x0600 mtspr IVOR5,r1 /* 5: Alignment */ li r1,0x0700 mtspr IVOR6,r1 /* 6: Program check */ li r1,0x0800 mtspr IVOR7,r1 /* 7: floating point unavailable */ li r1,0x0900 mtspr IVOR8,r1 /* 8: System call */ /* 9: Auxiliary processor unavailable(unsupported) */ li r1,0x0a00 mtspr IVOR10,r1 /* 10: Decrementer */ li r1,0x0b00 mtspr IVOR11,r1 /* 11: Interval timer */ li r1,0x0c00 mtspr IVOR12,r1 /* 12: Watchdog timer */ li r1,0x0d00 mtspr IVOR13,r1 /* 13: Data TLB error */ li r1,0x0e00 mtspr IVOR14,r1 /* 14: Instruction TLB error */ li r1,0x0f00 mtspr IVOR15,r1 /* 15: Debug */ /* Clear and set up some registers. */ li r0,0x0000 lis r1,0xffff mtspr DEC,r0 /* prevent dec exceptions */ mttbl r0 /* prevent fit & wdt exceptions */ mttbu r0 mtspr TSR,r1 /* clear all timer exception status */ mtspr TCR,r0 /* disable all */ mtspr ESR,r0 /* clear exception syndrome register */ mtspr MCSR,r0 /* machine check syndrome register */ mtxer r0 /* clear integer exception register */ /* Enable Time Base and Select Time Base Clock */ lis r0,HID0_EMCP@h /* Enable machine check */ #if defined(CONFIG_ENABLE_36BIT_PHYS) ori r0,r0,HID0_ENMAS7@l /* Enable MAS7 */ #endif ori r0,r0,HID0_TBEN@l /* Enable Timebase */ mtspr HID0,r0 li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */ mtspr HID1,r0 /* Enable Branch Prediction */ #if defined(CONFIG_BTB) li r0,0x201 /* BBFI = 1, BPEN = 1 */ mtspr BUCSR,r0 #endif #if defined(CFG_INIT_DBCR) lis r1,0xffff ori r1,r1,0xffff mtspr DBSR,r1 /* Clear all status bits */ lis r0,CFG_INIT_DBCR@h /* DBCR0[IDM] must be set */ ori r0,r0,CFG_INIT_DBCR@l mtspr DBCR0,r0 #endif /* create a temp mapping in AS=1 to the boot window */ lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16M)@h ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16M)@l lis r8,FSL_BOOKE_MAS2(TEXT_BASE, (MAS2_I|MAS2_G))@h ori r8,r8,FSL_BOOKE_MAS2(TEXT_BASE, (MAS2_I|MAS2_G))@l lis r9,FSL_BOOKE_MAS3(0xff800000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h ori r9,r9,FSL_BOOKE_MAS3(0xff800000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l mtspr MAS0,r6 mtspr MAS1,r7 mtspr MAS2,r8 mtspr MAS3,r9 isync msync tlbwe /* create a temp mapping in AS=1 to the stack */ lis r6,FSL_BOOKE_MAS0(1, 14, 0)@h ori r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@h ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@l lis r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@h ori r8,r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@l lis r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h ori r9,r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l mtspr MAS0,r6 mtspr MAS1,r7 mtspr MAS2,r8 mtspr MAS3,r9 isync msync tlbwe lis r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@h ori r6,r6,MSR_CE|MSR_ME|MSR_DE|MSR_IS|MSR_DS@l lis r7,switch_as@h ori r7,r7,switch_as@l mtspr SPRN_SRR0,r7 mtspr SPRN_SRR1,r6 rfi switch_as: /* L1 DCache is used for initial RAM */ /* Allocate Initial RAM in data cache. */ lis r3,CFG_INIT_RAM_ADDR@h ori r3,r3,CFG_INIT_RAM_ADDR@l mfspr r2, L1CFG0 andi. r2, r2, 0x1ff /* cache size * 1024 / (2 * L1 line size) */ slwi r2, r2, (10 - 1 - L1_CACHE_SHIFT) mtctr r2 li r0,0 1: dcbz r0,r3 dcbtls 0,r0,r3 addi r3,r3,CFG_CACHELINE_SIZE bdnz 1b /* Jump out the last 4K page and continue to 'normal' start */ #ifdef CFG_RAMBOOT b _start_cont #else /* Calculate absolute address in FLASH and jump there */ /*--------------------------------------------------------------*/ lis r3,CFG_MONITOR_BASE@h ori r3,r3,CFG_MONITOR_BASE@l addi r3,r3,_start_cont - _start + _START_OFFSET mtlr r3 blr #endif .text .globl _start _start: .long 0x27051956 /* U-BOOT Magic Number */ .globl version_string version_string: .ascii U_BOOT_VERSION .ascii " (", __DATE__, " - ", __TIME__, ")" .ascii CONFIG_IDENT_STRING, "\0" .align 4 .globl _start_cont _start_cont: /* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/ lis r1,CFG_INIT_RAM_ADDR@h ori r1,r1,CFG_INIT_SP_OFFSET@l li r0,0 stwu r0,-4(r1) stwu r0,-4(r1) /* Terminate call chain */ stwu r1,-8(r1) /* Save back chain and move SP */ lis r0,RESET_VECTOR@h /* Address of reset vector */ ori r0,r0,RESET_VECTOR@l stwu r1,-8(r1) /* Save back chain and move SP */ stw r0,+12(r1) /* Save return addr (underflow vect) */ GET_GOT bl cpu_init_early_f /* switch back to AS = 0 */ lis r3,(MSR_CE|MSR_ME|MSR_DE)@h ori r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l mtmsr r3 isync bl cpu_init_f bl board_init_f isync . = EXC_OFF_SYS_RESET .globl _start_of_vectors _start_of_vectors: /* Critical input. */ CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException) /* Machine check */ MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException) /* Data Storage exception. */ STD_EXCEPTION(0x0300, DataStorage, UnknownException) /* Instruction Storage exception. */ STD_EXCEPTION(0x0400, InstStorage, UnknownException) /* External Interrupt exception. */ STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException) /* Alignment exception. */ . = 0x0600 Alignment: EXCEPTION_PROLOG(SRR0, SRR1) 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 */ lwz r6,GOT(transfer_to_handler) mtlr r6 blrl .L_Alignment: .long AlignmentException - _start + _START_OFFSET .long int_return - _start + _START_OFFSET /* Program check exception */ . = 0x0700 ProgramCheck: EXCEPTION_PROLOG(SRR0, SRR1) addi r3,r1,STACK_FRAME_OVERHEAD li r20,MSR_KERNEL rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ lwz r6,GOT(transfer_to_handler) mtlr r6 blrl .L_ProgramCheck: .long ProgramCheckException - _start + _START_OFFSET .long int_return - _start + _START_OFFSET /* No FPU on MPC85xx. This exception is not supposed to happen. */ STD_EXCEPTION(0x0800, FPUnavailable, UnknownException) . = 0x0900 /* * 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(0x0a00, Decrementer, timer_interrupt) STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException) STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException) STD_EXCEPTION(0x0d00, DataTLBError, UnknownException) STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException) CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException ) .globl _end_of_vectors _end_of_vectors: . = . + (0x100 - ( . & 0xff )) /* align for debug */ /* * 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) mtspr SPRG2,r22 /* r1 is now kernel sp */ 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 crit_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 SPRN_CSRR0,r2 mtspr SPRN_CSRR1,r0 lwz r0,GPR0(r1) lwz r2,GPR2(r1) lwz r1,GPR1(r1) SYNC rfci mck_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 SPRN_MCSRR0,r2 mtspr SPRN_MCSRR1,r0 lwz r0,GPR0(r1) lwz r2,GPR2(r1) lwz r1,GPR1(r1) SYNC rfmci /* Cache functions. */ invalidate_icache: mfspr r0,L1CSR1 ori r0,r0,L1CSR1_ICFI msync isync mtspr L1CSR1,r0 isync blr /* entire I cache */ invalidate_dcache: mfspr r0,L1CSR0 ori r0,r0,L1CSR0_DCFI msync isync mtspr L1CSR0,r0 isync blr .globl icache_enable icache_enable: mflr r8 bl invalidate_icache mtlr r8 isync mfspr r4,L1CSR1 ori r4,r4,0x0001 oris r4,r4,0x0001 mtspr L1CSR1,r4 isync blr .globl icache_disable icache_disable: mfspr r0,L1CSR1 lis r3,0 ori r3,r3,L1CSR1_ICE andc r0,r0,r3 mtspr L1CSR1,r0 isync blr .globl icache_status icache_status: mfspr r3,L1CSR1 andi. r3,r3,L1CSR1_ICE blr .globl dcache_enable dcache_enable: mflr r8 bl invalidate_dcache mtlr r8 isync mfspr r0,L1CSR0 ori r0,r0,0x0001 oris r0,r0,0x0001 msync isync mtspr L1CSR0,r0 isync blr .globl dcache_disable dcache_disable: mfspr r3,L1CSR0 lis r4,0 ori r4,r4,L1CSR0_DCE andc r3,r3,r4 mtspr L1CSR0,r0 isync blr .globl dcache_status dcache_status: mfspr r3,L1CSR0 andi. r3,r3,L1CSR0_DCE blr .globl get_pir get_pir: mfspr r3,PIR blr .globl get_pvr get_pvr: mfspr r3,PVR blr .globl get_svr get_svr: mfspr r3,SVR blr .globl wr_tcr wr_tcr: mtspr TCR,r3 blr /*------------------------------------------------------------------------------- */ /* Function: in8 */ /* Description: Input 8 bits */ /*------------------------------------------------------------------------------- */ .globl in8 in8: lbz r3,0x0000(r3) blr /*------------------------------------------------------------------------------- */ /* Function: out8 */ /* Description: Output 8 bits */ /*------------------------------------------------------------------------------- */ .globl out8 out8: stb r4,0x0000(r3) sync blr /*------------------------------------------------------------------------------- */ /* Function: out16 */ /* Description: Output 16 bits */ /*------------------------------------------------------------------------------- */ .globl out16 out16: sth r4,0x0000(r3) sync blr /*------------------------------------------------------------------------------- */ /* Function: out16r */ /* Description: Byte reverse and output 16 bits */ /*------------------------------------------------------------------------------- */ .globl out16r out16r: sthbrx r4,r0,r3 sync blr /*------------------------------------------------------------------------------- */ /* Function: out32 */ /* Description: Output 32 bits */ /*------------------------------------------------------------------------------- */ .globl out32 out32: stw r4,0x0000(r3) sync blr /*------------------------------------------------------------------------------- */ /* Function: out32r */ /* Description: Byte reverse and output 32 bits */ /*------------------------------------------------------------------------------- */ .globl out32r out32r: stwbrx r4,r0,r3 sync blr /*------------------------------------------------------------------------------- */ /* Function: in16 */ /* Description: Input 16 bits */ /*------------------------------------------------------------------------------- */ .globl in16 in16: lhz r3,0x0000(r3) blr /*------------------------------------------------------------------------------- */ /* Function: in16r */ /* Description: Input 16 bits and byte reverse */ /*------------------------------------------------------------------------------- */ .globl in16r in16r: lhbrx r3,r0,r3 blr /*------------------------------------------------------------------------------- */ /* Function: in32 */ /* Description: Input 32 bits */ /*------------------------------------------------------------------------------- */ .globl in32 in32: lwz 3,0x0000(3) blr /*------------------------------------------------------------------------------- */ /* Function: in32r */ /* Description: Input 32 bits and byte reverse */ /*------------------------------------------------------------------------------- */ .globl in32r in32r: lwbrx r3,r0,r3 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 Init 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 /* the 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 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 /* * Re-point the IVPR at RAM */ mtspr IVPR,r10 /* * We are done. Do not return, instead branch to second part of board * initialization, now running from RAM. */ addi r0,r10,in_ram - _start + _START_OFFSET mtlr r0 blr /* NEVER RETURNS! */ .globl in_ram 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) lwz r4,GOT(_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 /* Init 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_of_vectors) 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_CriticalInput - _start + _START_OFFSET bl trap_reloc li r7,.L_MachineCheck - _start + _START_OFFSET bl trap_reloc li r7,.L_DataStorage - _start + _START_OFFSET bl trap_reloc li r7,.L_InstStorage - _start + _START_OFFSET bl trap_reloc li r7,.L_ExtInterrupt - _start + _START_OFFSET bl trap_reloc li r7,.L_Alignment - _start + _START_OFFSET bl trap_reloc li r7,.L_ProgramCheck - _start + _START_OFFSET bl trap_reloc li r7,.L_FPUnavailable - _start + _START_OFFSET bl trap_reloc li r7,.L_Decrementer - _start + _START_OFFSET bl trap_reloc li r7,.L_IntervalTimer - _start + _START_OFFSET li r8,_end_of_vectors - _start + _START_OFFSET 2: bl trap_reloc addi r7,r7,0x100 /* next exception vector */ cmplw 0,r7,r8 blt 2b lis r7,0x0 mtspr IVPR,r7 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 .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 mfspr r4,L1CFG0 andi. r4,r4,0x1ff slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT) mtctr r4 1: dcbi r0,r3 addi r3,r3,CFG_CACHELINE_SIZE bdnz 1b sync /* Invalidate the TLB entries for the cache */ lis r3,CFG_INIT_RAM_ADDR@h ori r3,r3,CFG_INIT_RAM_ADDR@l tlbivax 0,r3 addi r3,r3,0x1000 tlbivax 0,r3 addi r3,r3,0x1000 tlbivax 0,r3 addi r3,r3,0x1000 tlbivax 0,r3 isync blr