| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright 2004, 2007, 2011 Freescale Semiconductor. |
| * Srikanth Srinivasan <srikanth.srinivaan@freescale.com> |
| */ |
| |
| /* U-Boot - Startup Code for 86xx PowerPC based Embedded Boards |
| * |
| * |
| * The processor starts at 0xfff00100 and the code is executed |
| * from flash. The code is organized to be at an other address |
| * in memory, but as long we don't jump around before relocating. |
| * board_init lies at a quite high address and when the cpu has |
| * jumped there, everything is ok. |
| */ |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <mpc86xx.h> |
| #include <version.h> |
| |
| #include <ppc_asm.tmpl> |
| #include <ppc_defs.h> |
| |
| #include <asm/cache.h> |
| #include <asm/mmu.h> |
| #include <asm/u-boot.h> |
| |
| /* |
| * Need MSR_DR | MSR_IR enabled to access I/O (printf) in exceptions |
| */ |
| |
| /* |
| * Set up GOT: Global Offset Table |
| * |
| * Use r12 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(__bss_end) |
| GOT_ENTRY(__bss_start) |
| END_GOT |
| |
| /* |
| * r3 - 1st arg to board_init(): IMMP pointer |
| * r4 - 2nd arg to board_init(): boot flag |
| */ |
| .text |
| .long 0x27051956 /* U-Boot Magic Number */ |
| .globl version_string |
| version_string: |
| .ascii U_BOOT_VERSION_STRING, "\0" |
| |
| . = EXC_OFF_SYS_RESET |
| .globl _start |
| _start: |
| b boot_cold |
| |
| /* the boot code is located below the exception 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(SRR0, SRR1) |
| mfspr r4,DAR |
| stw r4,_DAR(r21) |
| mfspr r5,DSISR |
| stw r5,_DSISR(r21) |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE) |
| |
| /* Program check exception */ |
| . = 0x700 |
| ProgramCheck: |
| EXCEPTION_PROLOG(SRR0, SRR1) |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException, |
| MSR_KERNEL, COPY_EE) |
| |
| 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, SoftEmu, SoftEmuException) |
| STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException) |
| STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException) |
| STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException) |
| STD_EXCEPTION(0x1400, DataTLBError, UnknownException) |
| STD_EXCEPTION(0x1500, Reserved5, UnknownException) |
| STD_EXCEPTION(0x1600, Reserved6, UnknownException) |
| STD_EXCEPTION(0x1700, Reserved7, UnknownException) |
| STD_EXCEPTION(0x1800, Reserved8, UnknownException) |
| STD_EXCEPTION(0x1900, Reserved9, UnknownException) |
| STD_EXCEPTION(0x1a00, ReservedA, UnknownException) |
| STD_EXCEPTION(0x1b00, ReservedB, UnknownException) |
| STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException) |
| STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException) |
| |
| .globl _end_of_vectors |
| _end_of_vectors: |
| |
| . = 0x2000 |
| |
| boot_cold: |
| /* |
| * NOTE: Only Cpu 0 will ever come here. Other cores go to an |
| * address specified by the BPTR |
| */ |
| 1: |
| #ifdef CONFIG_SYS_RAMBOOT |
| /* disable everything */ |
| li r0, 0 |
| mtspr HID0, r0 |
| sync |
| mtmsr 0 |
| #endif |
| |
| /* Invalidate BATs */ |
| bl invalidate_bats |
| sync |
| /* Invalidate all of TLB before MMU turn on */ |
| bl clear_tlbs |
| sync |
| |
| #ifdef CONFIG_SYS_L2 |
| /* init the L2 cache */ |
| lis r3, L2_INIT@h |
| ori r3, r3, L2_INIT@l |
| mtspr l2cr, r3 |
| /* invalidate the L2 cache */ |
| bl l2cache_invalidate |
| sync |
| #endif |
| |
| /* |
| * Calculate absolute address in FLASH and jump there |
| *------------------------------------------------------*/ |
| lis r3, CONFIG_SYS_MONITOR_BASE_EARLY@h |
| ori r3, r3, CONFIG_SYS_MONITOR_BASE_EARLY@l |
| addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET |
| mtlr r3 |
| blr |
| |
| in_flash: |
| /* let the C-code set up the rest */ |
| /* */ |
| /* Be careful to keep code relocatable ! */ |
| /*------------------------------------------------------*/ |
| /* perform low-level init */ |
| |
| /* enable extended addressing */ |
| bl enable_ext_addr |
| |
| /* setup the bats */ |
| bl early_bats |
| |
| /* |
| * Cache must be enabled here for stack-in-cache trick. |
| * This means we need to enable the BATS. |
| * Cache should be turned on after BATs, since by default |
| * everything is write-through. |
| */ |
| |
| /* enable address translation */ |
| mfmsr r5 |
| ori r5, r5, (MSR_IR | MSR_DR) |
| lis r3,addr_trans_enabled@h |
| ori r3, r3, addr_trans_enabled@l |
| mtspr SPRN_SRR0,r3 |
| mtspr SPRN_SRR1,r5 |
| rfi |
| |
| addr_trans_enabled: |
| /* enable and invalidate the data cache */ |
| /* bl l1dcache_enable */ |
| bl dcache_enable |
| sync |
| |
| #if 1 |
| bl icache_enable |
| #endif |
| |
| #ifdef CONFIG_SYS_INIT_RAM_LOCK |
| bl lock_ram_in_cache |
| sync |
| #endif |
| |
| #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR) |
| bl setup_ccsrbar |
| #endif |
| |
| /* set up the stack pointer in our newly created |
| * cache-ram (r1) */ |
| lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h |
| ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_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 */ |
| |
| GET_GOT /* initialize GOT access */ |
| |
| /* run low-level CPU init code (from Flash) */ |
| bl cpu_init_f |
| sync |
| |
| #ifdef RUN_DIAG |
| |
| /* Load PX_AUX register address in r4 */ |
| lis r4, PIXIS_BASE@h |
| ori r4, r4, 0x6 |
| /* Load contents of PX_AUX in r3 bits 24 to 31*/ |
| lbz r3, 0(r4) |
| |
| /* Mask and obtain the bit in r3 */ |
| rlwinm. r3, r3, 0, 24, 24 |
| /* If not zero, jump and continue with u-boot */ |
| bne diag_done |
| |
| /* Load back contents of PX_AUX in r3 bits 24 to 31 */ |
| lbz r3, 0(r4) |
| /* Set the MSB of the register value */ |
| ori r3, r3, 0x80 |
| /* Write value in r3 back to PX_AUX */ |
| stb r3, 0(r4) |
| |
| /* Get the address to jump to in r3*/ |
| lis r3, CONFIG_SYS_DIAG_ADDR@h |
| ori r3, r3, CONFIG_SYS_DIAG_ADDR@l |
| |
| /* Load the LR with the branch address */ |
| mtlr r3 |
| |
| /* Branch to diagnostic */ |
| blr |
| |
| diag_done: |
| #endif |
| |
| /* bl l2cache_enable */ |
| |
| /* run 1st part of board init code (from Flash) */ |
| li r3, 0 /* clear boot_flag for calling board_init_f */ |
| bl board_init_f |
| sync |
| |
| /* NOTREACHED - board_init_f() does not return */ |
| |
| .globl invalidate_bats |
| invalidate_bats: |
| |
| li r0, 0 |
| /* invalidate BATs */ |
| mtspr IBAT0U, r0 |
| mtspr IBAT1U, r0 |
| mtspr IBAT2U, r0 |
| mtspr IBAT3U, r0 |
| mtspr IBAT4U, r0 |
| mtspr IBAT5U, r0 |
| mtspr IBAT6U, r0 |
| mtspr IBAT7U, r0 |
| |
| isync |
| mtspr DBAT0U, r0 |
| mtspr DBAT1U, r0 |
| mtspr DBAT2U, r0 |
| mtspr DBAT3U, r0 |
| mtspr DBAT4U, r0 |
| mtspr DBAT5U, r0 |
| mtspr DBAT6U, r0 |
| mtspr DBAT7U, r0 |
| |
| isync |
| sync |
| blr |
| |
| #define CONFIG_BAT_PAIR(n) \ |
| lis r4, CONFIG_SYS_IBAT##n##L@h; \ |
| ori r4, r4, CONFIG_SYS_IBAT##n##L@l; \ |
| lis r3, CONFIG_SYS_IBAT##n##U@h; \ |
| ori r3, r3, CONFIG_SYS_IBAT##n##U@l; \ |
| mtspr IBAT##n##L, r4; \ |
| mtspr IBAT##n##U, r3; \ |
| lis r4, CONFIG_SYS_DBAT##n##L@h; \ |
| ori r4, r4, CONFIG_SYS_DBAT##n##L@l; \ |
| lis r3, CONFIG_SYS_DBAT##n##U@h; \ |
| ori r3, r3, CONFIG_SYS_DBAT##n##U@l; \ |
| mtspr DBAT##n##L, r4; \ |
| mtspr DBAT##n##U, r3; |
| |
| /* |
| * setup_bats: |
| * |
| * Set up the final BAT registers now that setup is done. |
| * |
| * Assumes that: |
| * 1) Address translation is enabled upon entry |
| * 2) The boot rom is still accessible via 1:1 translation |
| */ |
| .globl setup_bats |
| setup_bats: |
| mflr r5 |
| sync |
| |
| /* |
| * When we disable address translation, we will get 1:1 (VA==PA) |
| * translation. The only place we know for sure is safe for that is |
| * the bootrom where we originally started out. Pop back into there. |
| */ |
| lis r4, CONFIG_SYS_MONITOR_BASE_EARLY@h |
| ori r4, r4, CONFIG_SYS_MONITOR_BASE_EARLY@l |
| addi r4, r4, trans_disabled - _start + EXC_OFF_SYS_RESET |
| |
| /* disable address translation */ |
| mfmsr r3 |
| rlwinm r3, r3, 0, 28, 25 |
| mtspr SRR0, r4 |
| mtspr SRR1, r3 |
| rfi |
| |
| trans_disabled: |
| #if defined(CONFIG_SYS_DBAT0U) && defined(CONFIG_SYS_DBAT0L) \ |
| && defined(CONFIG_SYS_IBAT0U) && defined(CONFIG_SYS_IBAT0L) |
| CONFIG_BAT_PAIR(0) |
| #endif |
| CONFIG_BAT_PAIR(1) |
| CONFIG_BAT_PAIR(2) |
| CONFIG_BAT_PAIR(3) |
| CONFIG_BAT_PAIR(4) |
| CONFIG_BAT_PAIR(5) |
| CONFIG_BAT_PAIR(6) |
| CONFIG_BAT_PAIR(7) |
| |
| sync |
| isync |
| |
| /* Turn translation back on and return */ |
| mfmsr r3 |
| ori r3, r3, (MSR_IR | MSR_DR) |
| mtspr SPRN_SRR0,r5 |
| mtspr SPRN_SRR1,r3 |
| rfi |
| |
| /* |
| * early_bats: |
| * |
| * Set up bats needed early on - this is usually the BAT for the |
| * stack-in-cache, the Flash, and CCSR space |
| */ |
| .globl early_bats |
| early_bats: |
| /* IBAT 3 */ |
| lis r4, CONFIG_SYS_IBAT3L@h |
| ori r4, r4, CONFIG_SYS_IBAT3L@l |
| lis r3, CONFIG_SYS_IBAT3U@h |
| ori r3, r3, CONFIG_SYS_IBAT3U@l |
| mtspr IBAT3L, r4 |
| mtspr IBAT3U, r3 |
| isync |
| |
| /* DBAT 3 */ |
| lis r4, CONFIG_SYS_DBAT3L@h |
| ori r4, r4, CONFIG_SYS_DBAT3L@l |
| lis r3, CONFIG_SYS_DBAT3U@h |
| ori r3, r3, CONFIG_SYS_DBAT3U@l |
| mtspr DBAT3L, r4 |
| mtspr DBAT3U, r3 |
| isync |
| |
| /* IBAT 5 */ |
| lis r4, CONFIG_SYS_IBAT5L@h |
| ori r4, r4, CONFIG_SYS_IBAT5L@l |
| lis r3, CONFIG_SYS_IBAT5U@h |
| ori r3, r3, CONFIG_SYS_IBAT5U@l |
| mtspr IBAT5L, r4 |
| mtspr IBAT5U, r3 |
| isync |
| |
| /* DBAT 5 */ |
| lis r4, CONFIG_SYS_DBAT5L@h |
| ori r4, r4, CONFIG_SYS_DBAT5L@l |
| lis r3, CONFIG_SYS_DBAT5U@h |
| ori r3, r3, CONFIG_SYS_DBAT5U@l |
| mtspr DBAT5L, r4 |
| mtspr DBAT5U, r3 |
| isync |
| |
| /* IBAT 6 */ |
| lis r4, CONFIG_SYS_IBAT6L_EARLY@h |
| ori r4, r4, CONFIG_SYS_IBAT6L_EARLY@l |
| lis r3, CONFIG_SYS_IBAT6U_EARLY@h |
| ori r3, r3, CONFIG_SYS_IBAT6U_EARLY@l |
| mtspr IBAT6L, r4 |
| mtspr IBAT6U, r3 |
| isync |
| |
| /* DBAT 6 */ |
| lis r4, CONFIG_SYS_DBAT6L_EARLY@h |
| ori r4, r4, CONFIG_SYS_DBAT6L_EARLY@l |
| lis r3, CONFIG_SYS_DBAT6U_EARLY@h |
| ori r3, r3, CONFIG_SYS_DBAT6U_EARLY@l |
| mtspr DBAT6L, r4 |
| mtspr DBAT6U, r3 |
| isync |
| |
| #if(CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR) |
| /* IBAT 7 */ |
| lis r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@h |
| ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_IBATL@l |
| lis r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@h |
| ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_IBATU@l |
| mtspr IBAT7L, r4 |
| mtspr IBAT7U, r3 |
| isync |
| |
| /* DBAT 7 */ |
| lis r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@h |
| ori r4, r4, CONFIG_SYS_CCSR_DEFAULT_DBATL@l |
| lis r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@h |
| ori r3, r3, CONFIG_SYS_CCSR_DEFAULT_DBATU@l |
| mtspr DBAT7L, r4 |
| mtspr DBAT7U, r3 |
| isync |
| #endif |
| blr |
| |
| .globl clear_tlbs |
| clear_tlbs: |
| addis r3, 0, 0x0000 |
| addis r5, 0, 0x4 |
| isync |
| tlblp: |
| tlbie r3 |
| sync |
| addi r3, r3, 0x1000 |
| cmp 0, 0, r3, r5 |
| blt tlblp |
| blr |
| |
| .globl disable_addr_trans |
| disable_addr_trans: |
| /* disable address translation */ |
| mflr r4 |
| mfmsr r3 |
| andi. r0, r3, (MSR_IR | MSR_DR) |
| beqlr |
| andc r3, r3, r0 |
| mtspr SRR0, r4 |
| mtspr SRR1, r3 |
| rfi |
| |
| /* |
| * 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 |
| |
| .globl dc_read |
| dc_read: |
| 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) |
| blr |
| |
| /* |
| * Function: out16 |
| * Description: Output 16 bits |
| */ |
| .globl out16 |
| out16: |
| sth r4,0x0000(r3) |
| blr |
| |
| /* |
| * Function: out16r |
| * Description: Byte reverse and output 16 bits |
| */ |
| .globl out16r |
| out16r: |
| sthbrx r4,r0,r3 |
| blr |
| |
| /* |
| * Function: out32 |
| * Description: Output 32 bits |
| */ |
| .globl out32 |
| out32: |
| stw r4,0x0000(r3) |
| blr |
| |
| /* |
| * Function: out32r |
| * Description: Byte reverse and output 32 bits |
| */ |
| .globl out32r |
| out32r: |
| stwbrx r4,r0,r3 |
| 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 Global Data pointer */ |
| mr r10, r5 /* Save copy of Destination Address */ |
| |
| GET_GOT |
| mr r3, r5 /* Destination Address */ |
| lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */ |
| ori r4, r4, CONFIG_SYS_MONITOR_BASE@l |
| lwz r5, GOT(__init_end) |
| sub r5, r5, r4 |
| li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */ |
| |
| /* |
| * Fix GOT pointer: |
| * |
| * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address |
| * |
| * Offset: |
| */ |
| sub r15, r10, r4 |
| |
| /* First our own GOT */ |
| add r12, r12, 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 |
| 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 |
| |
| /* |
| * 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, r12 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) |
| cmpwi r0,0 |
| beq- 2f |
| add r0,r0,r11 |
| stw r0,0(r3) |
| 2: bdnz 1b |
| |
| /* |
| * Now adjust the fixups and the pointers to the fixups |
| * in case we need to move ourselves again. |
| */ |
| 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 |
| cmpwi r0,0 |
| add r0,r0,r11 |
| stw r4,0(r3) |
| beq- 5f |
| stw r0,0(r4) |
| 5: bdnz 3b |
| 4: |
| /* clear_bss: */ |
| /* |
| * Now clear BSS segment |
| */ |
| lwz r3,GOT(__bss_start) |
| lwz r4,GOT(__bss_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 Date pointer */ |
| mr r4, r10 /* Destination Address */ |
| bl board_init_r |
| |
| /* not reached - end relocate_code */ |
| /*-----------------------------------------------------------------------*/ |
| |
| /* |
| * Copy exception vector code to low memory |
| * |
| * r3: dest_addr |
| * r7: source address, r8: end address, r9: target address |
| */ |
| .globl trap_init |
| trap_init: |
| mflr r4 /* save link register */ |
| GET_GOT |
| 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 */ |
| 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 |
| |
| /* enable execptions from RAM vectors */ |
| mfmsr r7 |
| li r8,MSR_IP |
| andc r7,r7,r8 |
| ori r7,r7,MSR_ME /* Enable Machine Check */ |
| mtmsr r7 |
| |
| mtlr r4 /* restore link register */ |
| blr |
| |
| .globl enable_ext_addr |
| enable_ext_addr: |
| mfspr r0, HID0 |
| lis r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@h |
| ori r0, r0, (HID0_HIGH_BAT_EN | HID0_XBSEN | HID0_XAEN)@l |
| mtspr HID0, r0 |
| sync |
| isync |
| blr |
| |
| #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR) |
| .globl setup_ccsrbar |
| setup_ccsrbar: |
| /* Special sequence needed to update CCSRBAR itself */ |
| lis r4, CONFIG_SYS_CCSRBAR_DEFAULT@h |
| ori r4, r4, CONFIG_SYS_CCSRBAR_DEFAULT@l |
| |
| lis r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@h |
| ori r5, r5, CONFIG_SYS_CCSRBAR_PHYS_LOW@l |
| srwi r5,r5,12 |
| li r6, CONFIG_SYS_CCSRBAR_PHYS_HIGH@l |
| rlwimi r5,r6,20,8,11 |
| stw r5, 0(r4) /* Store physical value of CCSR */ |
| isync |
| |
| lis r5, CONFIG_SYS_TEXT_BASE@h |
| ori r5,r5,CONFIG_SYS_TEXT_BASE@l |
| lwz r5, 0(r5) |
| isync |
| |
| /* Use VA of CCSR to do read */ |
| lis r3, CONFIG_SYS_CCSRBAR@h |
| lwz r5, CONFIG_SYS_CCSRBAR@l(r3) |
| isync |
| |
| blr |
| #endif |
| |
| #ifdef CONFIG_SYS_INIT_RAM_LOCK |
| lock_ram_in_cache: |
| /* Allocate Initial RAM in data cache. |
| */ |
| lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h |
| ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l |
| li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \ |
| (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32 |
| mtctr r4 |
| 1: |
| dcbz r0, r3 |
| addi r3, r3, 32 |
| bdnz 1b |
| #if 1 |
| /* Lock the data cache */ |
| mfspr r0, HID0 |
| ori r0, r0, 0x1000 |
| sync |
| mtspr HID0, r0 |
| sync |
| blr |
| #endif |
| #if 0 |
| /* Lock the first way of the data cache */ |
| mfspr r0, LDSTCR |
| ori r0, r0, 0x0080 |
| #if defined(CONFIG_ALTIVEC) |
| dssall |
| #endif |
| sync |
| mtspr LDSTCR, r0 |
| sync |
| isync |
| blr |
| #endif |
| |
| .globl unlock_ram_in_cache |
| unlock_ram_in_cache: |
| /* invalidate the INIT_RAM section */ |
| lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h |
| ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l |
| li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \ |
| (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32 |
| mtctr r4 |
| 1: icbi r0, r3 |
| addi r3, r3, 32 |
| bdnz 1b |
| sync /* Wait for all icbi to complete on bus */ |
| isync |
| #if 1 |
| /* Unlock the data cache and invalidate it */ |
| mfspr r0, HID0 |
| li r3,0x1000 |
| andc r0,r0,r3 |
| li r3,0x0400 |
| or r0,r0,r3 |
| sync |
| mtspr HID0, r0 |
| sync |
| blr |
| #endif |
| #if 0 |
| /* Unlock the first way of the data cache */ |
| mfspr r0, LDSTCR |
| li r3,0x0080 |
| andc r0,r0,r3 |
| #ifdef CONFIG_ALTIVEC |
| dssall |
| #endif |
| sync |
| mtspr LDSTCR, r0 |
| sync |
| isync |
| li r3,0x0400 |
| or r0,r0,r3 |
| sync |
| mtspr HID0, r0 |
| sync |
| blr |
| #endif |
| #endif |
