[PATCH V5 2/9] Initial e500v2 start up code
Renaud Barbier
renaud.barbier at ge.com
Thu May 17 12:49:44 EDT 2012
This is the first part of the start-up code. The source code origin is
U-boot and is slightly modified to have e500v2 CPU support in 32-bit
mode only.
It includes the power-up entry point, CPU initialization code and
exports definition for D-cache flush and I-cache invalidate.
Signed-off-by: Renaud Barbier <renaud.barbier at ge.com>
---
arch/ppc/cpu-85xx/resetvec.S | 2 +
arch/ppc/cpu-85xx/start.S | 1085 ++++++++++++++++++++++++++++++++++++++++++
arch/ppc/include/asm/cache.h | 2 +
3 files changed, 1089 insertions(+), 0 deletions(-)
create mode 100644 arch/ppc/cpu-85xx/resetvec.S
create mode 100644 arch/ppc/cpu-85xx/start.S
diff --git a/arch/ppc/cpu-85xx/resetvec.S b/arch/ppc/cpu-85xx/resetvec.S
new file mode 100644
index 0000000..29555d4
--- /dev/null
+++ b/arch/ppc/cpu-85xx/resetvec.S
@@ -0,0 +1,2 @@
+ .section .resetvec,"ax"
+ b _start_e500
diff --git a/arch/ppc/cpu-85xx/start.S b/arch/ppc/cpu-85xx/start.S
new file mode 100644
index 0000000..fd9051b
--- /dev/null
+++ b/arch/ppc/cpu-85xx/start.S
@@ -0,0 +1,1085 @@
+/*
+ * Copyright 2004, 2007-2011 Freescale Semiconductor, Inc.
+ * 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 <asm/config.h>
+
+#include <asm/processor.h>
+#include <asm/ppc_asm.tmpl>
+#include <asm/ppc_defs.h>
+#include <asm/cache.h>
+
+#include <mach/mpc85xx.h>
+#include <mach/mmu.h>
+
+#undef MSR_KERNEL
+#define MSR_KERNEL ( MSR_ME ) /* Machine Check */
+
+/*
+ * 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(_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/invalidate the I-Cache */
+ lis r2,(L1CSR1_ICFI|L1CSR1_ICLFR)@h
+ ori r2,r2,(L1CSR1_ICFI|L1CSR1_ICLFR)@l
+ mtspr SPRN_L1CSR1,r2
+1:
+ mfspr r3,SPRN_L1CSR1
+ and. r1,r3,r2
+ bne 1b
+
+ lis r3,(L1CSR1_CPE|L1CSR1_ICE)@h
+ ori r3,r3,(L1CSR1_CPE|L1CSR1_ICE)@l
+ mtspr SPRN_L1CSR1,r3
+ isync
+2:
+ mfspr r3,SPRN_L1CSR1
+ andi. r1,r3,L1CSR1_ICE at l
+ beq 2b
+
+ /* Enable/invalidate the D-Cache */
+ lis r2,(L1CSR0_DCFI|L1CSR0_DCLFR)@h
+ ori r2,r2,(L1CSR0_DCFI|L1CSR0_DCLFR)@l
+ mtspr SPRN_L1CSR0,r2
+1:
+ mfspr r3,SPRN_L1CSR0
+ and. r1,r3,r2
+ bne 1b
+
+ lis r3,(L1CSR0_CPE|L1CSR0_DCE)@h
+ ori r3,r3,(L1CSR0_CPE|L1CSR0_DCE)@l
+ mtspr SPRN_L1CSR0,r3
+ isync
+2:
+ mfspr r3,SPRN_L1CSR0
+ andi. r1,r3,L1CSR0_DCE at l
+ beq 2b
+
+ /* Setup interrupt vectors */
+ lis r1,TEXT_BASE at 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 at h /* Enable machine check */
+ ori r0,r0,HID0_TBEN at l /* Enable Timebase */
+ mtspr HID0,r0
+
+ li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */
+ mfspr r3,PVR
+ andi. r3,r3, 0xff
+ cmpwi r3,0x50 at l /* if we are rev 5.0 or greater set MBDD */
+ blt 1f
+ /* Set MBDD bit also */
+ ori r0, r0, HID1_MBDD at l
+1:
+ mtspr HID1,r0
+
+ /* Enable Branch Prediction */
+#if defined(CFG_BTB)
+ lis r0,BUCSR_ENABLE at h
+ ori r0,r0,BUCSR_ENABLE at l
+ mtspr SPRN_BUCSR,r0
+#endif
+
+ lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h
+ ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
+
+ /* create a temp mapping in AS=1 to the 4M boot window */
+ lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@h
+ ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@l
+
+ lis r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@h
+ ori r8,r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@l
+
+ lis r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
+ ori r9,r9,FSL_BOOKE_MAS3(0xffc00000, 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_IS|MSR_DS at h
+ ori r6,r6,MSR_IS|MSR_DS at l
+ lis r7,switch_as at h
+ ori r7,r7,switch_as at 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 at h
+ ori r3,r3,CFG_INIT_RAM_ADDR at 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,CACHELINE_SIZE
+ bdnz 1b
+
+ /*
+ * Jump out the last 4K page and continue to 'normal' start.
+ * Calculate absolute address in FLASH and jump there.
+ */
+ lis r3,TEXT_BASE at h
+ ori r3,r3,TEXT_BASE at l
+ addi r3,r3,_start_cont - _start + _START_OFFSET
+ mtlr r3
+ blr
+
+ .text
+ .globl _start
+_start:
+ .long 0x62626F78 /* Magic Number */
+
+ .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 at h
+ ori r1,r1,CFG_INIT_SP_OFFSET at 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 at h /* Address of reset vector */
+ ori r0,r0,RESET_VECTOR at 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 initdram
+ b relocate_code
+ isync
+
+ /* NOTREACHED - board_init_f() does not return */
+
+ . = 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)
+
+/* 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
+ EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
+
+/* Program check exception */
+ . = 0x0700
+ProgramCheck:
+ EXCEPTION_PROLOG(SRR0, SRR1)
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
+ MSR_KERNEL, COPY_EE)
+
+ /* 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, UnknownException)
+ 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 at 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.
+ */
+.globl invalidate_icache
+invalidate_icache:
+ mfspr r0,L1CSR1
+ ori r0,r0,L1CSR1_ICFI
+ msync
+ isync
+ mtspr L1CSR1,r0
+ isync
+ blr
+
+.globl invalidate_dcache
+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,r3
+ 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 e500_write_tlb(mas0, mas1, mas2, mas3, mas7)
+ */
+ .globl e500_write_tlb
+e500_write_tlb:
+ mtspr MAS0,r3
+ mtspr MAS1,r4
+ mtspr MAS2,r5
+ mtspr MAS3,r6
+ li r3,0
+ isync
+ tlbwe
+ msync
+ isync
+ blr
+
+/*
+ * void relocate_code (end of ram)
+ *
+ * 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 r9, r3 /* Save end of RAM */
+
+ lis r10, (_end - _start)@h /* Size */
+ ori r10, r10, (_end - _start)@l
+ sub r3, r3, r10
+
+ /* 64KB aligned */
+ lis r10, 0xffff0000 at h
+ ori r10, r10, 0xffff0000 at l
+ and r3, r3, r10
+
+ mr r1, r3 /* Set new stack just below barebox code */
+ mr r10, r3 /* Save copy of Destination Address */
+
+ bl calc_source
+calc_source:
+ mfspr r4, LR /* r4 = address in memory (flash, RAM) */
+ subi r4, r4, (calc_source - _start)
+
+ GET_GOT
+ lis r5, __init_size at h
+ ori r5, r5, __init_size at l
+
+ li r6,CACHELINE_SIZE
+
+ /*
+ * Fix GOT pointer:
+ *
+ * New GOT-PTR = (old GOT-PTR - TEXT_BASE) + Destination Address
+ *
+ * Offset:
+ */
+ sub r15,r10,r4
+
+ /* First our own GOT */
+ add r14,r14,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
+
+ /*
+ * 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 at 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 at 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(_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, 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_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 */
+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_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
+
+
+.globl _text_base
+_text_base:
+ .long TEXT_BASE
+
+.globl unlock_ram_in_cache
+unlock_ram_in_cache:
+ /* invalidate the INIT_RAM section */
+ lis r3,(CFG_INIT_RAM_ADDR & ~(CACHELINE_SIZE-1))@h
+ ori r3,r3,(CFG_INIT_RAM_ADDR & ~(CACHELINE_SIZE-1))@l
+ mfspr r4,L1CFG0
+ andi. r4,r4,0x1ff
+ slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT)
+ mtctr r4
+1: dcbi r0,r3
+ addi r3,r3,CACHELINE_SIZE
+ bdnz 1b
+ sync
+
+ /* Invalidate the TLB entries for the cache */
+ lis r3,CFG_INIT_RAM_ADDR at h
+ ori r3,r3,CFG_INIT_RAM_ADDR at l
+ tlbivax 0,r3
+ addi r3,r3,0x1000
+ tlbivax 0,r3
+ addi r3,r3,0x1000
+ tlbivax 0,r3
+ addi r3,r3,0x1000
+ tlbivax 0,r3
+ isync
+ blr
+
+.globl flush_dcache
+flush_dcache:
+ mfspr r3,SPRN_L1CFG0
+
+ rlwinm r5,r3,9,3 /* Extract cache block size */
+ twlgti r5,1 /* Only 32 and 64 byte cache blocks
+ * are currently defined.
+ */
+ li r4,32
+ subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
+ * log2(number of ways)
+ */
+ slw r5,r4,r5 /* r5 = cache block size */
+
+ rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
+ mulli r7,r7,13 /* An 8-way cache will require 13
+ * loads per set.
+ */
+ slw r7,r7,r6
+
+ /* save off HID0 and set DCFA */
+ mfspr r8,SPRN_HID0
+ ori r9,r8,HID0_DCFA at l
+ mtspr SPRN_HID0,r9
+ isync
+
+ lis r4,0
+ mtctr r7
+
+1: lwz r3,0(r4) /* Load... */
+ add r4,r4,r5
+ bdnz 1b
+
+ msync
+ lis r4,0
+ mtctr r7
+
+1: dcbf 0,r4 /* ...and flush. */
+ add r4,r4,r5
+ bdnz 1b
+
+ /* restore HID0 */
+ mtspr SPRN_HID0,r8
+ isync
+
+ blr
+
+.globl setup_ivors
+setup_ivors:
+
+#include "fixed_ivor.S"
+ blr
diff --git a/arch/ppc/include/asm/cache.h b/arch/ppc/include/asm/cache.h
index 4f7ca86..147ceb6 100644
--- a/arch/ppc/include/asm/cache.h
+++ b/arch/ppc/include/asm/cache.h
@@ -31,6 +31,8 @@
extern void flush_dcache_range(unsigned long start, unsigned long stop);
extern void clean_dcache_range(unsigned long start, unsigned long stop);
extern void invalidate_dcache_range(unsigned long start, unsigned long stop);
+extern void flush_dcache(void);
+extern void invalidate_icache(void);
#ifdef CFG_INIT_RAM_LOCK
extern void unlock_ram_in_cache(void);
#endif /* CFG_INIT_RAM_LOCK */
--
1.7.1
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