/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 1998 Dan Malek * Copyright (C) 1999 Magnus Damm * Copyright (C) 2000, 2001,2002 Wolfgang Denk * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008. */ /* * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards */ #include #include #include #include #define CONFIG_83XX 1 /* needed for Linux kernel header files*/ #include #include #include #include #include #include "hrcw/hrcw.h" #include "bats/bats.h" /* 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 #if defined(CONFIG_NAND_SPL) || \ (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL)) #define MINIMAL_SPL #endif #if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \ !defined(CONFIG_SYS_RAMBOOT) #define CONFIG_SYS_FLASHBOOT #endif /* * Set up GOT: Global Offset Table * * Use r12 to access the GOT */ START_GOT GOT_ENTRY(_GOT2_TABLE_) GOT_ENTRY(__bss_start) GOT_ENTRY(__bss_end) #ifndef MINIMAL_SPL GOT_ENTRY(_FIXUP_TABLE_) GOT_ENTRY(_start) GOT_ENTRY(_start_of_vectors) GOT_ENTRY(_end_of_vectors) GOT_ENTRY(transfer_to_handler) #endif END_GOT /* * The Hard Reset Configuration Word (HRCW) table is in the first 64 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8 * times so the processor can fetch it out of flash whether the flash * is 8, 16, 32, or 64 bits wide (hardware trickery). */ .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(CONFIG_SYS_HRCW_LOW) _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH) /* * Magic number and version string - put it after the HRCW since it * cannot be first in flash like it is in many other processors. */ .long 0x27051956 /* U-Boot Magic Number */ .globl version_string version_string: .ascii U_BOOT_VERSION_STRING, "\0" .align 2 .globl enable_addr_trans enable_addr_trans: /* enable address translation */ mfmsr r5 ori r5, r5, (MSR_IR | MSR_DR) mtmsr r5 isync 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 .globl ppcDWstore ppcDWstore: lfd 1, 0(r4) stfd 1, 0(r3) blr .globl ppcDWload ppcDWload: lfd 1, 0(r3) stfd 1, 0(r4) blr #ifndef CONFIG_DEFAULT_IMMR #error CONFIG_DEFAULT_IMMR must be defined #endif /* CONFIG_DEFAULT_IMMR */ #ifndef CONFIG_SYS_IMMR #define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR #endif /* CONFIG_SYS_IMMR */ /* * 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 */ lis r4, CONFIG_DEFAULT_IMMR@h nop mfmsr r5 /* save msr contents */ /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */ bl 1f 1: mflr r7 lis r3, CONFIG_SYS_IMMR@h ori r3, r3, CONFIG_SYS_IMMR@l lwz r6, IMMRBAR(r4) isync stw r3, IMMRBAR(r4) lwz r6, 0(r7) /* Arbitrary external load */ isync lwz r6, IMMRBAR(r3) isync /* Initialise the E300 processor core */ /*------------------------------------------*/ #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \ defined(CONFIG_NAND_SPL) /* The FCM begins execution after only the first page * is loaded. Wait for the rest before branching * to another flash page. */ 1: lwz r6, 0x50b0(r3) andi. r6, r6, 1 beq 1b #endif bl init_e300_core #ifdef CONFIG_SYS_FLASHBOOT /* 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, (CONFIG_SYS_MONITOR_BASE)@h ori r4, r4, (CONFIG_SYS_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 /* CONFIG_SYS_FLASHBOOT */ /* setup the bats */ bl setup_bats sync /* * Cache must be enabled here for stack-in-cache trick. * This means we need to enable the BATS. * This means: * 1) for the EVB, original gt regs need to be mapped * 2) need to have an IBAT for the 0xf region, * we are running there! * Cache should be turned on after BATs, since by default * everything is write-through. * The init-mem BAT can be reused after reloc. The old * gt-regs BAT can be reused after board_init_f calls * board_early_init_f (EVB only). */ /* enable address translation */ bl enable_addr_trans sync /* enable the data cache */ bl dcache_enable sync #ifdef CONFIG_SYS_INIT_RAM_LOCK bl lock_ram_in_cache sync #endif /* set up the stack pointer in our newly created * cache-ram; use r3 to keep the new SP for now to * avoid overiding the SP it uselessly */ lis r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l /* r4 = end of GD area */ addi r4, r3, GENERATED_GBL_DATA_SIZE /* Zero GD area */ li r0, 0 1: subi r4, r4, 1 stb r0, 0(r4) cmplw r3, r4 bne 1b #if CONFIG_VAL(SYS_MALLOC_F_LEN) #if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE #error "SYS_MALLOC_F_LEN too large to fit into initial RAM." #endif /* r3 = new stack pointer / pre-reloc malloc area */ subi r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN) /* Set pointer to pre-reloc malloc area in GD */ stw r3, GD_MALLOC_BASE(r4) #endif li r0, 0 /* Make room for stack frame header and */ stwu r0, -4(r3) /* clear final stack frame so that */ stwu r0, -4(r3) /* stack backtraces terminate cleanly */ /* Finally, actually set SP */ mr r1, r3 /* let the C-code set up the rest */ /* */ /* Be careful to keep code relocatable & stack humble */ /*------------------------------------------------------*/ GET_GOT /* initialize GOT access */ /* Needed for -msingle-pic-base */ bl _GLOBAL_OFFSET_TABLE_@local-4 mflr r30 /* r3: IMMR */ lis r3, CONFIG_SYS_IMMR@h /* run low-level CPU init code (in Flash)*/ bl cpu_init_f /* run 1st part of board init code (in Flash)*/ li r3, 0 /* clear boot_flag for calling board_init_f */ bl board_init_f /* NOTREACHED - board_init_f() does not return */ #ifndef MINIMAL_SPL /* * 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(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, 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 #endif /* !MINIMAL_SPL */ /* * 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, CONFIG_SYS_IMMR@h #if defined(CONFIG_WATCHDOG) /* Initialise the Watchdog values and reset it (if req) */ /*------------------------------------------------------*/ lis r4, CONFIG_SYS_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, -0x55C7 sth r4, SWSRR@l(r3) #else /* Disable Watchdog */ /*-------------------*/ lwz r4, SWCRR(r3) /* Check to see if its enabled for disabling once disabled by SW you can't re-enable */ andi. r4, r4, 0x4 beq 1f xor r4, r4, r4 stw r4, SWCRR(r3) 1: #endif /* CONFIG_WATCHDOG */ #if defined(CONFIG_MASK_AER_AO) /* Write the Arbiter Event Enable to mask Address Only traps. */ /* This prevents the dcbz instruction from being trapped when */ /* HID0_ABE Address Broadcast Enable is set and the MEMORY */ /* COHERENCY bit is set in the WIMG bits, which is often */ /* needed for PCI operation. */ lwz r4, 0x0808(r3) rlwinm r0, r4, 0, ~AER_AO stw r0, 0x0808(r3) #endif /* CONFIG_MASK_AER_AO */ /* Initialize the Hardware Implementation-dependent Registers */ /* HID0 also contains cache control */ /* - force invalidation of data and instruction caches */ /*------------------------------------------------------*/ lis r3, CONFIG_SYS_HID0_INIT@h ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l SYNC mtspr HID0, r3 lis r3, CONFIG_SYS_HID0_FINAL@h ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l SYNC mtspr HID0, r3 lis r3, CONFIG_SYS_HID2@h ori r3, r3, CONFIG_SYS_HID2@l SYNC mtspr HID2, r3 /* Done! */ /*------------------------------*/ blr /* setup_bats - set them up to some initial state */ .globl setup_bats setup_bats: addis r0, r0, 0x0000 /* IBAT 0 */ addis r4, r0, CONFIG_SYS_IBAT0L@h ori r4, r4, CONFIG_SYS_IBAT0L@l addis r3, r0, CONFIG_SYS_IBAT0U@h ori r3, r3, CONFIG_SYS_IBAT0U@l mtspr IBAT0L, r4 mtspr IBAT0U, r3 /* DBAT 0 */ addis r4, r0, CONFIG_SYS_DBAT0L@h ori r4, r4, CONFIG_SYS_DBAT0L@l addis r3, r0, CONFIG_SYS_DBAT0U@h ori r3, r3, CONFIG_SYS_DBAT0U@l mtspr DBAT0L, r4 mtspr DBAT0U, r3 /* IBAT 1 */ addis r4, r0, CONFIG_SYS_IBAT1L@h ori r4, r4, CONFIG_SYS_IBAT1L@l addis r3, r0, CONFIG_SYS_IBAT1U@h ori r3, r3, CONFIG_SYS_IBAT1U@l mtspr IBAT1L, r4 mtspr IBAT1U, r3 /* DBAT 1 */ addis r4, r0, CONFIG_SYS_DBAT1L@h ori r4, r4, CONFIG_SYS_DBAT1L@l addis r3, r0, CONFIG_SYS_DBAT1U@h ori r3, r3, CONFIG_SYS_DBAT1U@l mtspr DBAT1L, r4 mtspr DBAT1U, r3 /* IBAT 2 */ addis r4, r0, CONFIG_SYS_IBAT2L@h ori r4, r4, CONFIG_SYS_IBAT2L@l addis r3, r0, CONFIG_SYS_IBAT2U@h ori r3, r3, CONFIG_SYS_IBAT2U@l mtspr IBAT2L, r4 mtspr IBAT2U, r3 /* DBAT 2 */ addis r4, r0, CONFIG_SYS_DBAT2L@h ori r4, r4, CONFIG_SYS_DBAT2L@l addis r3, r0, CONFIG_SYS_DBAT2U@h ori r3, r3, CONFIG_SYS_DBAT2U@l mtspr DBAT2L, r4 mtspr DBAT2U, r3 /* IBAT 3 */ addis r4, r0, CONFIG_SYS_IBAT3L@h ori r4, r4, CONFIG_SYS_IBAT3L@l addis r3, r0, CONFIG_SYS_IBAT3U@h ori r3, r3, CONFIG_SYS_IBAT3U@l mtspr IBAT3L, r4 mtspr IBAT3U, r3 /* DBAT 3 */ addis r4, r0, CONFIG_SYS_DBAT3L@h ori r4, r4, CONFIG_SYS_DBAT3L@l addis r3, r0, CONFIG_SYS_DBAT3U@h ori r3, r3, CONFIG_SYS_DBAT3U@l mtspr DBAT3L, r4 mtspr DBAT3U, r3 #ifdef CONFIG_HIGH_BATS /* IBAT 4 */ addis r4, r0, CONFIG_SYS_IBAT4L@h ori r4, r4, CONFIG_SYS_IBAT4L@l addis r3, r0, CONFIG_SYS_IBAT4U@h ori r3, r3, CONFIG_SYS_IBAT4U@l mtspr IBAT4L, r4 mtspr IBAT4U, r3 /* DBAT 4 */ addis r4, r0, CONFIG_SYS_DBAT4L@h ori r4, r4, CONFIG_SYS_DBAT4L@l addis r3, r0, CONFIG_SYS_DBAT4U@h ori r3, r3, CONFIG_SYS_DBAT4U@l mtspr DBAT4L, r4 mtspr DBAT4U, r3 /* IBAT 5 */ addis r4, r0, CONFIG_SYS_IBAT5L@h ori r4, r4, CONFIG_SYS_IBAT5L@l addis r3, r0, CONFIG_SYS_IBAT5U@h ori r3, r3, CONFIG_SYS_IBAT5U@l mtspr IBAT5L, r4 mtspr IBAT5U, r3 /* DBAT 5 */ addis r4, r0, CONFIG_SYS_DBAT5L@h ori r4, r4, CONFIG_SYS_DBAT5L@l addis r3, r0, CONFIG_SYS_DBAT5U@h ori r3, r3, CONFIG_SYS_DBAT5U@l mtspr DBAT5L, r4 mtspr DBAT5U, r3 /* IBAT 6 */ addis r4, r0, CONFIG_SYS_IBAT6L@h ori r4, r4, CONFIG_SYS_IBAT6L@l addis r3, r0, CONFIG_SYS_IBAT6U@h ori r3, r3, CONFIG_SYS_IBAT6U@l mtspr IBAT6L, r4 mtspr IBAT6U, r3 /* DBAT 6 */ addis r4, r0, CONFIG_SYS_DBAT6L@h ori r4, r4, CONFIG_SYS_DBAT6L@l addis r3, r0, CONFIG_SYS_DBAT6U@h ori r3, r3, CONFIG_SYS_DBAT6U@l mtspr DBAT6L, r4 mtspr DBAT6U, r3 /* IBAT 7 */ addis r4, r0, CONFIG_SYS_IBAT7L@h ori r4, r4, CONFIG_SYS_IBAT7L@l addis r3, r0, CONFIG_SYS_IBAT7U@h ori r3, r3, CONFIG_SYS_IBAT7U@l mtspr IBAT7L, r4 mtspr IBAT7U, r3 /* DBAT 7 */ addis r4, r0, CONFIG_SYS_DBAT7L@h ori r4, r4, CONFIG_SYS_DBAT7L@l addis r3, r0, CONFIG_SYS_DBAT7U@h ori r3, r3, CONFIG_SYS_DBAT7U@l mtspr DBAT7L, r4 mtspr DBAT7U, r3 #endif isync /* 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/powerpc/kernel/head.S * */ lis r3, 0 lis r5, 2 1: tlbie r3 addi r3, r3, 0x1000 cmp 0, 0, r3, r5 blt 1b blr /* Cache functions. * * Note: requires that all cache bits in * HID0 are in the low half word. */ #ifndef MINIMAL_SPL .globl icache_enable icache_enable: mfspr r3, HID0 ori r3, r3, HID0_ICE li r4, HID0_ICFI|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_ICFI|HID0_ILOCK andc r3, r3, r4 isync mtspr HID0, r3 /* clears invalidate, enable and lock */ blr .globl icache_status icache_status: mfspr r3, HID0 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31 blr #endif /* !MINIMAL_SPL */ .globl dcache_enable dcache_enable: mfspr r3, HID0 li r5, HID0_DCFI|HID0_DLOCK andc r3, r3, r5 ori r3, r3, HID0_DCE sync mtspr HID0, r3 /* enable, no invalidate */ blr .globl dcache_disable dcache_disable: mflr r4 bl flush_dcache /* uses r3 and r5 */ mfspr r3, HID0 li r5, HID0_DCE|HID0_DLOCK andc r3, r3, r5 ori r5, r3, HID0_DCFI sync mtspr HID0, r5 /* sets invalidate, clears enable and lock */ sync mtspr HID0, r3 /* clears invalidate */ mtlr r4 blr .globl dcache_status dcache_status: mfspr r3, HID0 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31 blr .globl flush_dcache flush_dcache: lis r3, 0 lis r5, CONFIG_SYS_CACHELINE_SIZE 1: cmp 0, 1, r3, r5 bge 2f lwz r5, 0(r3) lis r5, CONFIG_SYS_CACHELINE_SIZE addi r3, r3, 0x4 b 1b 2: 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(__bss_start) 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) /* 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: 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 #ifndef MINIMAL_SPL /* * 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: #endif 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 /* Global Data pointer */ mr r4, r10 /* Destination Address */ bl board_init_r #ifndef MINIMAL_SPL /* * 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 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 #endif /* !MINIMAL_SPL */ #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 /* Lock the data cache */ mfspr r0, HID0 ori r0, r0, HID0_DLOCK sync mtspr HID0, r0 sync blr #ifndef MINIMAL_SPL .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 dcbi r0, r3 addi r3, r3, 32 bdnz 1b sync /* Wait for all icbi to complete on bus */ isync /* Unlock the data cache and invalidate it */ mfspr r3, HID0 li r5, HID0_DLOCK|HID0_DCFI andc r3, r3, r5 /* no invalidate, unlock */ ori r5, r3, HID0_DCFI /* invalidate, unlock */ sync mtspr HID0, r5 /* invalidate, unlock */ sync mtspr HID0, r3 /* no invalidate, unlock */ blr #endif /* !MINIMAL_SPL */ #endif /* CONFIG_SYS_INIT_RAM_LOCK */ #ifdef CONFIG_SYS_FLASHBOOT map_flash_by_law1: /* When booting from ROM (Flash or EPROM), clear the */ /* Address Mask in OR0 so ROM appears everywhere */ /*----------------------------------------------------*/ lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */ 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, (CONFIG_SYS_FLASH_BASE)@h ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */ /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */ lis r4, (0x80000012)@h ori r4, r4, (0x80000012)@l li r5, CONFIG_SYS_FLASH_SIZE 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */ addi r4, r4, 1 bne 1b stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */ /* Wait for HW to catch up */ lwz r4, LBLAWAR1(r3) twi 0,r4,0 isync 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, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l or r5, r5, r4 stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */ lwz r4, OR0(r3) lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1) or r4, r4, r5 stw r4, OR0(r3) lis r4, (CONFIG_SYS_FLASH_BASE)@h ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */ /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */ lis r4, (0x80000012)@h ori r4, r4, (0x80000012)@l li r5, CONFIG_SYS_FLASH_SIZE 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */ addi r4, r4, 1 bne 1b stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */ xor r4, r4, r4 stw r4, LBLAWBAR1(r3) stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */ /* Wait for HW to catch up */ lwz r4, LBLAWAR1(r3) twi 0,r4,0 isync blr #endif /* CONFIG_SYS_FLASHBOOT */