| /* |
| * 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 |
| |
| #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 |
| mfspr r4,L1CFG0 |
| andi. r4,r4,0x1ff |
| slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT) |
| mtctr r4 |
| 1: icbi r0,r3 |
| dcbi r0,r3 |
| addi r3,r3,CFG_CACHELINE_SIZE |
| bdnz 1b |
| sync /* Wait for all icbi to complete on bus */ |
| isync |
| blr |
| #endif |