diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc824x/start.S')
| -rw-r--r-- | arch/powerpc/cpu/mpc824x/start.S | 724 |
1 files changed, 0 insertions, 724 deletions
diff --git a/arch/powerpc/cpu/mpc824x/start.S b/arch/powerpc/cpu/mpc824x/start.S deleted file mode 100644 index 55238df..0000000 --- a/arch/powerpc/cpu/mpc824x/start.S +++ /dev/null @@ -1,724 +0,0 @@ -/* - * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> - * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> - * Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* U-Boot - Startup Code for PowerPC based Embedded Boards - * - * - * The processor starts at 0x00000100 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. - * This works because the cpu gives the FLASH (CS0) the whole - * address space at startup, and board_init lies as a echo of - * the flash somewhere up there in the memorymap. - * - * board_init will change CS0 to be positioned at the correct - * address and (s)dram will be positioned at address 0 - */ -#include <asm-offsets.h> -#include <config.h> -#include <mpc824x.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> - -/* We don't want the MMU yet. -*/ -#undef MSR_KERNEL -/* FP, Machine Check and Recoverable Interr. */ -#define MSR_KERNEL ( MSR_FP | MSR_ME | MSR_RI ) - -/* - * 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: - /* Initialize machine status; enable machine check interrupt */ - /*----------------------------------------------------------------------*/ - li r3, MSR_KERNEL /* Set FP, ME, RI flags */ - mtmsr r3 - mtspr SRR1, r3 /* Make SRR1 match MSR */ - - addis r0,0,0x0000 /* lets make sure that r0 is really 0 */ - mtspr HID0, r0 /* disable I and D caches */ - - mfspr r3, ICR /* clear Interrupt Cause Register */ - - mfmsr r3 /* turn off address translation */ - addis r4,0,0xffff - ori r4,r4,0xffcf - and r3,r3,r4 - mtmsr r3 - isync - sync /* the MMU should be off... */ - - -in_flash: - /* - * Setup BATs - cannot be done in C since we don't have a stack yet - */ - bl setup_bats - - /* Enable MMU. - */ - mfmsr r3 - ori r3, r3, (MSR_IR | MSR_DR) - mtmsr r3 - - /* Enable and invalidate data cache. - */ - mfspr r3, HID0 - mr r2, r3 - ori r3, r3, HID0_DCE | HID0_DCI - ori r2, r2, HID0_DCE - sync - mtspr HID0, r3 - mtspr HID0, r2 - sync - - /* Allocate Initial RAM in data cache. - */ - lis r3, CONFIG_SYS_INIT_RAM_ADDR@h - ori r3, r3, CONFIG_SYS_INIT_RAM_ADDR@l - li r2, 128 - mtctr r2 -1: - dcbz r0, r3 - addi r3, r3, 32 - bdnz 1b - - /* Lock way0 in data cache. - */ - mfspr r3, 1011 - lis r2, 0xffff - ori r2, r2, 0xff1f - and r3, r3, r2 - ori r3, r3, 0x0080 - sync - mtspr 1011, r3 - - /* - * Thisk the stack pointer *somewhere* sensible. Doesnt - * matter much where as we'll move it when we relocate - */ - 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 */ - - /* let the C-code set up the rest */ - /* */ - /* Be careful to keep code relocatable ! */ - /*----------------------------------------------------------------------*/ - - GET_GOT /* initialize GOT access */ - - /* r3: IMMR */ - bl cpu_init_f /* run low-level CPU init code (from Flash) */ - - bl board_init_f /* run 1st part of board init code (from Flash) */ - - /* NOTREACHED - board_init_f() does not return */ - - - .globl _start_of_vectors -_start_of_vectors: - -/* Machine check */ - STD_EXCEPTION(EXC_OFF_MACH_CHCK, MachineCheck, MachineCheckException) - -/* Data Storage exception. "Never" generated on the 860. */ - STD_EXCEPTION(EXC_OFF_DATA_STOR, DataStorage, UnknownException) - -/* Instruction Storage exception. "Never" generated on the 860. */ - STD_EXCEPTION(EXC_OFF_INS_STOR, InstStorage, UnknownException) - -/* External Interrupt exception. */ - STD_EXCEPTION(EXC_OFF_EXTERNAL, ExtInterrupt, external_interrupt) - -/* Alignment exception. */ - . = EXC_OFF_ALIGN -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 */ - . = EXC_OFF_PROGRAM -ProgramCheck: - EXCEPTION_PROLOG(SRR0, SRR1) - addi r3,r1,STACK_FRAME_OVERHEAD - EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException, - MSR_KERNEL, COPY_EE) - - /* No FPU on MPC8xx. This exception is not supposed to happen. - */ - STD_EXCEPTION(EXC_OFF_FPUNAVAIL, FPUnavailable, UnknownException) - - /* I guess we could implement decrementer, and may have - * to someday for timekeeping. - */ - STD_EXCEPTION(EXC_OFF_DECR, Decrementer, timer_interrupt) - STD_EXCEPTION(0xa00, Trap_0a, UnknownException) - STD_EXCEPTION(0xb00, Trap_0b, UnknownException) - STD_EXCEPTION(0xc00, SystemCall, UnknownException) - - STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException) - - STD_EXCEPTION(EXC_OFF_FPUNASSIST, Trap_0e, UnknownException) - STD_EXCEPTION(EXC_OFF_PMI, Trap_0f, UnknownException) - - STD_EXCEPTION(EXC_OFF_ITME, InstructionTransMiss, UnknownException) - STD_EXCEPTION(EXC_OFF_DLTME, DataLoadTransMiss, UnknownException) - STD_EXCEPTION(EXC_OFF_DSTME, DataStoreTransMiss, UnknownException) - STD_EXCEPTION(EXC_OFF_IABE, InstructionBreakpoint, DebugException) - STD_EXCEPTION(EXC_OFF_SMIE, SysManageInt, 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, ReservedC, UnknownException) - STD_EXCEPTION(0x1d00, ReservedD, UnknownException) - STD_EXCEPTION(0x1e00, ReservedE, UnknownException) - STD_EXCEPTION(0x1f00, ReservedF, UnknownException) - - STD_EXCEPTION(EXC_OFF_RMTE, RunModeTrace, 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) -#if 0 - andi. r23,r23,MSR_PR - mfspr r23,SPRG3 /* if from user, fix up tss.regs */ - beq 2f - addi r24,r1,STACK_FRAME_OVERHEAD - stw r24,PT_REGS(r23) -2: addi r2,r23,-TSS /* set r2 to current */ - tovirt(r2,r2,r23) -#endif - 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 */ -#if 0 - addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */ - cmplw 0,r1,r2 - cmplw 1,r1,r24 - crand 1,1,4 - bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */ -#endif - lwz r24,0(r23) /* virtual address of handler */ - lwz r23,4(r23) /* where to go when done */ - mtspr SRR0,r24 - ori r20,r20,0x30 /* enable IR, DR */ - 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 - -/* Cache functions. -*/ - .globl icache_enable -icache_enable: - mfspr r5,HID0 /* turn on the I cache. */ - ori r5,r5,0x8800 /* Instruction cache only! */ - addis r6,0,0xFFFF - ori r6,r6,0xF7FF - and r6,r5,r6 /* clear the invalidate bit */ - sync - mtspr HID0,r5 - mtspr HID0,r6 - isync - sync - blr - - .globl icache_disable -icache_disable: - mfspr r5,HID0 - addis r6,0,0xFFFF - ori r6,r6,0x7FFF - and r5,r5,r6 - sync - mtspr HID0,r5 - isync - sync - blr - - .globl icache_status -icache_status: - mfspr r3, HID0 - srwi r3, r3, 15 /* >>15 & 1=> select bit 16 */ - andi. r3, r3, 1 - blr - - .globl dcache_enable -dcache_enable: - mfspr r5,HID0 /* turn on the D cache. */ - ori r5,r5,0x4400 /* Data cache only! */ - mfspr r4, PVR /* read PVR */ - srawi r3, r4, 16 /* shift off the least 16 bits */ - cmpi 0, 0, r3, 0xC /* Check for Max pvr */ - bne NotMax - ori r5,r5,0x0040 /* setting the DCFA bit, for Max rev 1 errata */ -NotMax: - addis r6,0,0xFFFF - ori r6,r6,0xFBFF - and r6,r5,r6 /* clear the invalidate bit */ - sync - mtspr HID0,r5 - mtspr HID0,r6 - isync - sync - blr - - .globl dcache_disable -dcache_disable: - mfspr r5,HID0 - addis r6,0,0xFFFF - ori r6,r6,0xBFFF - and r5,r5,r6 - sync - mtspr HID0,r5 - isync - sync - blr - - .globl dcache_status -dcache_status: - mfspr r3, HID0 - srwi r3, r3, 14 /* >>14 & 1=> select bit 17 */ - andi. r3, r3, 1 - blr - - .globl dc_read -dc_read: -/*TODO : who uses this, what should it do? -*/ - blr - - - .globl get_pvr -get_pvr: - mfspr r3, PVR - blr - - -/*------------------------------------------------------------------------------*/ - -/* - * void relocate_code (addr_sp, gd, addr_moni) - * - * This "function" does not return, instead it continues in RAM - * after relocating the monitor code. - * - * r3 = dest - * r4 = src - * r5 = length in bytes - * r6 = cachelinesize - */ - .globl relocate_code -relocate_code: - - mr r1, r3 /* Set new stack pointer */ - mr r9, r4 /* Save copy of Global Data pointer */ - mr r10, r5 /* Save copy of Destination Address */ - - GET_GOT - mr r3, r5 /* Destination Address */ -#ifdef CONFIG_SYS_RAMBOOT - lis r4, CONFIG_SYS_SDRAM_BASE@h /* Source Address */ - ori r4, r4, CONFIG_SYS_SDRAM_BASE@l -#else - lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */ - ori r4, r4, CONFIG_SYS_MONITOR_BASE@l -#endif - 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 - /* 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 - -4: -/* Unlock the data cache and invalidate locked area */ - xor r0, r0, r0 - mtspr 1011, r0 - lis r4, CONFIG_SYS_INIT_RAM_ADDR@h - ori r4, r4, CONFIG_SYS_INIT_RAM_ADDR@l - li r0, 128 - mtctr r0 -41: - dcbi r0, r4 - addi r4, r4, 32 - bdnz 41b - -/* - * Now flush the cache: note that we must start from a cache aligned - * address. Otherwise we might miss one cache line. - */ - 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 - blt 5b -6: - - mr r3, r9 /* Global Data pointer */ - mr r4, r10 /* Destination Address */ - bl board_init_r - - /* - * Copy exception vector code to low memory - * - * r3: dest_addr - * r7: source address, r8: end address, r9: target address - */ - .globl trap_init -trap_init: - 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 - - mtlr r4 /* restore link register */ - blr - - /* Setup the BAT registers. - */ -setup_bats: - lis r4, CONFIG_SYS_IBAT0L@h - ori r4, r4, CONFIG_SYS_IBAT0L@l - lis r3, CONFIG_SYS_IBAT0U@h - ori r3, r3, CONFIG_SYS_IBAT0U@l - mtspr IBAT0L, r4 - mtspr IBAT0U, r3 - isync - - lis r4, CONFIG_SYS_DBAT0L@h - ori r4, r4, CONFIG_SYS_DBAT0L@l - lis r3, CONFIG_SYS_DBAT0U@h - ori r3, r3, CONFIG_SYS_DBAT0U@l - mtspr DBAT0L, r4 - mtspr DBAT0U, r3 - isync - - lis r4, CONFIG_SYS_IBAT1L@h - ori r4, r4, CONFIG_SYS_IBAT1L@l - lis r3, CONFIG_SYS_IBAT1U@h - ori r3, r3, CONFIG_SYS_IBAT1U@l - mtspr IBAT1L, r4 - mtspr IBAT1U, r3 - isync - - lis r4, CONFIG_SYS_DBAT1L@h - ori r4, r4, CONFIG_SYS_DBAT1L@l - lis r3, CONFIG_SYS_DBAT1U@h - ori r3, r3, CONFIG_SYS_DBAT1U@l - mtspr DBAT1L, r4 - mtspr DBAT1U, r3 - isync - - lis r4, CONFIG_SYS_IBAT2L@h - ori r4, r4, CONFIG_SYS_IBAT2L@l - lis r3, CONFIG_SYS_IBAT2U@h - ori r3, r3, CONFIG_SYS_IBAT2U@l - mtspr IBAT2L, r4 - mtspr IBAT2U, r3 - isync - - lis r4, CONFIG_SYS_DBAT2L@h - ori r4, r4, CONFIG_SYS_DBAT2L@l - lis r3, CONFIG_SYS_DBAT2U@h - ori r3, r3, CONFIG_SYS_DBAT2U@l - mtspr DBAT2L, r4 - mtspr DBAT2U, r3 - isync - - 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 - - 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 - - /* Invalidate TLBs. - * -> for (val = 0; val < 0x20000; val+=0x1000) - * -> tlbie(val); - */ - lis r3, 0 - lis r5, 2 - -1: - tlbie r3 - addi r3, r3, 0x1000 - cmp 0, 0, r3, r5 - blt 1b - - blr |