[U-Boot] [PATCH 04/13 v3] ARM: OMAP3: Add ARM Cortex A8 common directory
dirk.behme at googlemail.com
dirk.behme at googlemail.com
Thu Oct 9 19:53:59 CEST 2008
From: Dirk Behme <dirk.behme at gmail.com>
Add ARM Cortex A8 common directory
Signed-off-by: Dirk Behme <dirk.behme at gmail.com>
---
cpu/arm_cortexa8/Makefile | 43 +++
cpu/arm_cortexa8/config.mk | 36 +++
cpu/arm_cortexa8/cpu.c | 221 +++++++++++++++++++
cpu/arm_cortexa8/start.S | 522 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 822 insertions(+)
Index: u-boot-arm/cpu/arm_cortexa8/cpu.c
===================================================================
--- /dev/null
+++ u-boot-arm/cpu/arm_cortexa8/cpu.c
@@ -0,0 +1,221 @@
+/*
+ * (C) Copyright 2008 Texas Insturments
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger at sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj at denx.de>
+ *
+ * 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
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/arch/sys_proto.h>
+
+#ifdef CONFIG_USE_IRQ
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
+#ifndef CONFIG_L2_OFF
+void l2cache_disable(void);
+#endif
+
+/* read co-processor 15, register #1 (control register) */
+static unsigned long read_p15_c1(void)
+{
+ unsigned long value;
+
+ __asm__ __volatile__("mrc p15, 0, %0, c1, c0, 0\
+ @ read control reg\n":"=r"(value)
+ ::"memory");
+ return value;
+}
+
+/* write to co-processor 15, register #1 (control register) */
+static void write_p15_c1(unsigned long value)
+{
+ __asm__ __volatile__("mcr p15, 0, %0, c1, c0, 0\
+ @ write it back\n"::"r"(value)
+ : "memory");
+
+ read_p15_c1();
+}
+
+static void cp_delay(void)
+{
+ volatile int i;
+
+ /* Many OMAP regs need at least 2 nops */
+ for (i = 0; i < 100; i++) ;
+}
+
+/* See also ARM Ref. Man. */
+#define C1_MMU (1<<0) /* mmu off/on */
+#define C1_ALIGN (1<<1) /* alignment faults off/on */
+#define C1_DC (1<<2) /* dcache off/on */
+#define C1_WB (1<<3) /* merging write buffer on/off */
+#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */
+#define C1_SYS_PROT (1<<8) /* system protection */
+#define C1_ROM_PROT (1<<9) /* ROM protection */
+#define C1_IC (1<<12) /* icache off/on */
+#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */
+#define RESERVED_1 (0xf << 3) /* must be 111b for R/W */
+
+int cpu_init(void)
+{
+ /*
+ * setup up stacks if necessary
+ */
+#ifdef CONFIG_USE_IRQ
+ IRQ_STACK_START =
+ _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
+ FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
+#endif
+ return 0;
+}
+
+int cleanup_before_linux(void)
+{
+ unsigned int i;
+
+ /*
+ * this function is called just before we call linux
+ * it prepares the processor for linux
+ *
+ * we turn off caches etc ...
+ */
+ disable_interrupts();
+
+ /* turn off I/D-cache */
+ asm("mrc p15, 0, %0, c1, c0, 0":"=r"(i));
+ i &= ~(C1_DC | C1_IC);
+ asm("mcr p15, 0, %0, c1, c0, 0": :"r"(i));
+
+ /* invalidate I-cache */
+ arm_cache_flush();
+#ifndef CONFIG_L2_OFF
+ /* turn off L2 cache */
+ l2cache_disable();
+ /* invalidate L2 cache also */
+ v7_flush_dcache_all(get_device_type());
+#endif
+ i = 0;
+ /* mem barrier to sync up things */
+ asm("mcr p15, 0, %0, c7, c10, 4": :"r"(i));
+
+#ifndef CONFIG_L2_OFF
+ l2cache_enable();
+#endif
+
+ return 0;
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ disable_interrupts();
+ reset_cpu(0);
+
+ /* NOTREACHED */
+ return 0;
+}
+
+void icache_enable(void)
+{
+ ulong reg;
+
+ reg = read_p15_c1(); /* get control reg. */
+ cp_delay();
+ write_p15_c1(reg | C1_IC);
+}
+
+void icache_disable(void)
+{
+ ulong reg;
+
+ reg = read_p15_c1();
+ cp_delay();
+ write_p15_c1(reg & ~C1_IC);
+}
+
+void l2cache_enable()
+{
+ unsigned long i;
+ volatile unsigned int j;
+
+ /* ES2 onwards we can disable/enable L2 ourselves */
+ if (get_cpu_rev() == CPU_3430_ES2) {
+ __asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
+ __asm__ __volatile__("orr %0, %0, #0x2":"=r"(i));
+ __asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
+ } else {
+ /* Save r0, r12 and restore them after usage */
+ __asm__ __volatile__("mov %0, r12":"=r"(j));
+ __asm__ __volatile__("mov %0, r0":"=r"(i));
+
+ /* GP Device ROM code API usage here */
+ /* r12 = AUXCR Write function and r0 value */
+ __asm__ __volatile__("mov r12, #0x3");
+ __asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
+ __asm__ __volatile__("orr r0, r0, #0x2");
+ /* SMI instruction to call ROM Code API */
+ __asm__ __volatile__(".word 0xE1600070");
+ __asm__ __volatile__("mov r0, %0":"=r"(i));
+ __asm__ __volatile__("mov r12, %0":"=r"(j));
+ }
+
+}
+
+void l2cache_disable()
+{
+ unsigned long i;
+ volatile unsigned int j;
+
+ /* ES2 onwards we can disable/enable L2 ourselves */
+ if (get_cpu_rev() == CPU_3430_ES2) {
+ __asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
+ __asm__ __volatile__("bic %0, %0, #0x2":"=r"(i));
+ __asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
+ } else {
+ /* Save r0, r12 and restore them after usage */
+ __asm__ __volatile__("mov %0, r12":"=r"(j));
+ __asm__ __volatile__("mov %0, r0":"=r"(i));
+
+ /* GP Device ROM code API usage here */
+ /* r12 = AUXCR Write function and r0 value */
+ __asm__ __volatile__("mov r12, #0x3");
+ __asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
+ __asm__ __volatile__("bic r0, r0, #0x2");
+ /* SMI instruction to call ROM Code API */
+ __asm__ __volatile__(".word 0xE1600070");
+ __asm__ __volatile__("mov r0, %0":"=r"(i));
+ __asm__ __volatile__("mov r12, %0":"=r"(j));
+ }
+}
+
+int icache_status(void)
+{
+ return (read_p15_c1() & C1_IC) != 0;
+}
Index: u-boot-arm/cpu/arm_cortexa8/Makefile
===================================================================
--- /dev/null
+++ u-boot-arm/cpu/arm_cortexa8/Makefile
@@ -0,0 +1,43 @@
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+#
+# 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
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = lib$(CPU).a
+
+START := start.o
+OBJS := cpu.o
+
+all: .depend $(START) $(LIB)
+
+$(LIB): $(OBJS)
+ $(AR) crv $@ $(OBJS)
+
+#########################################################################
+
+.depend: Makefile $(START:.o=.S) $(OBJS:.o=.c)
+ $(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################
\ No newline at end of file
Index: u-boot-arm/cpu/arm_cortexa8/config.mk
===================================================================
--- /dev/null
+++ u-boot-arm/cpu/arm_cortexa8/config.mk
@@ -0,0 +1,36 @@
+#
+# (C) Copyright 2002
+# Gary Jennejohn, DENX Software Engineering, <gj at denx.de>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -ffixed-r8 \
+ -msoft-float
+
+# Make ARMv5 to allow more compilers to work, even though its v7a.
+PLATFORM_CPPFLAGS += -march=armv5
+# =========================================================================
+#
+# Supply options according to compiler version
+#
+# =========================================================================
+PLATFORM_CPPFLAGS +=$(call cc-option)
+PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,)
+PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,\
+ $(call cc-option,-malignment-traps,))
\ No newline at end of file
Index: u-boot-arm/cpu/arm_cortexa8/start.S
===================================================================
--- /dev/null
+++ u-boot-arm/cpu/arm_cortexa8/start.S
@@ -0,0 +1,522 @@
+/*
+ * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core
+ *
+ * Copyright (c) 2004 Texas Instruments <r-woodruff2 at ti.com>
+ *
+ * Copyright (c) 2001 Marius Gröger <mag at sysgo.de>
+ * Copyright (c) 2002 Alex Züpke <azu at sysgo.de>
+ * Copyright (c) 2002 Gary Jennejohn <gj at denx.de>
+ * Copyright (c) 2003 Richard Woodruff <r-woodruff2 at ti.com>
+ * Copyright (c) 2003 Kshitij <kshitij at ti.com>
+ * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim at ti.com>
+ *
+ * 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
+ */
+
+#include <config.h>
+#include <version.h>
+
+.globl _start
+_start: b reset
+ ldr pc, _undefined_instruction
+ ldr pc, _software_interrupt
+ ldr pc, _prefetch_abort
+ ldr pc, _data_abort
+ ldr pc, _not_used
+ ldr pc, _irq
+ ldr pc, _fiq
+
+_undefined_instruction: .word undefined_instruction
+_software_interrupt: .word software_interrupt
+_prefetch_abort: .word prefetch_abort
+_data_abort: .word data_abort
+_not_used: .word not_used
+_irq: .word irq
+_fiq: .word fiq
+_pad: .word 0x12345678 /* now 16*4=64 */
+.global _end_vect
+_end_vect:
+
+ .balignl 16,0xdeadbeef
+/*************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************/
+
+_TEXT_BASE:
+ .word TEXT_BASE
+
+.globl _armboot_start
+_armboot_start:
+ .word _start
+
+/*
+ * These are defined in the board-specific linker script.
+ */
+.globl _bss_start
+_bss_start:
+ .word __bss_start
+
+.globl _bss_end
+_bss_end:
+ .word _end
+
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+ .word 0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+ .word 0x0badc0de
+#endif
+
+/*
+ * the actual reset code
+ */
+
+reset:
+ /*
+ * set the cpu to SVC32 mode
+ */
+ mrs r0,cpsr
+ bic r0,r0,#0x1f
+ orr r0,r0,#0xd3
+ msr cpsr,r0
+
+#if (CONFIG_OMAP34XX)
+ /* Copy vectors to mask ROM indirect addr */
+ adr r0, _start @ r0 <- current position of code
+ add r0, r0, #4 @ skip reset vector
+ mov r2, #64 @ r2 <- size to copy
+ add r2, r0, r2 @ r2 <- source end address
+ mov r1, #SRAM_OFFSET0 @ build vect addr
+ mov r3, #SRAM_OFFSET1
+ add r1, r1, r3
+ mov r3, #SRAM_OFFSET2
+ add r1, r1, r3
+next:
+ ldmia r0!, {r3-r10} @ copy from source address [r0]
+ stmia r1!, {r3-r10} @ copy to target address [r1]
+ cmp r0, r2 @ until source end address [r2]
+ bne next @ loop until equal */
+#if !defined(CONFIG_SYS_NAND_BOOT) && !defined(CONFIG_SYS_ONENAND_BOOT)
+ /* No need to copy/exec the clock code - DPLL adjust already done
+ * in NAND/oneNAND Boot.
+ */
+ bl cpy_clk_code @ put dpll adjust code behind vectors
+#endif /* NAND Boot */
+#endif
+ /* the mask ROM code should have PLL and others stable */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+ bl cpu_init_crit
+#endif
+
+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
+relocate: @ relocate U-Boot to RAM
+ adr r0, _start @ r0 <- current position of code
+ ldr r1, _TEXT_BASE @ test if we run from flash or RAM
+ cmp r0, r1 @ don't reloc during debug
+ beq stack_setup
+
+ ldr r2, _armboot_start
+ ldr r3, _bss_start
+ sub r2, r3, r2 @ r2 <- size of armboot
+ add r2, r0, r2 @ r2 <- source end address
+
+copy_loop: @ copy 32 bytes at a time
+ ldmia r0!, {r3-r10} @ copy from source address [r0]
+ stmia r1!, {r3-r10} @ copy to target address [r1]
+ cmp r0, r2 @ until source end addreee [r2]
+ ble copy_loop
+#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
+
+ /* Set up the stack */
+stack_setup:
+ ldr r0, _TEXT_BASE @ upper 128 KiB: relocated uboot
+ sub r0, r0, #CONFIG_SYS_MALLOC_LEN @ malloc area
+ sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE @ bdinfo
+#ifdef CONFIG_USE_IRQ
+ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
+#endif
+ sub sp, r0, #12 @ leave 3 words for abort-stack
+ and sp, sp, #~7 @ 8 byte alinged for (ldr/str)d
+
+ /* Clear BSS (if any). Is below tx (watch load addr - need space) */
+clear_bss:
+ ldr r0, _bss_start @ find start of bss segment
+ ldr r1, _bss_end @ stop here
+ mov r2, #0x00000000 @ clear value
+clbss_l:
+ str r2, [r0] @ clear BSS location
+ cmp r0, r1 @ are we at the end yet
+ add r0, r0, #4 @ increment clear index pointer
+ bne clbss_l @ keep clearing till at end
+
+ ldr pc, _start_armboot @ jump to C code
+
+_start_armboot: .word start_armboot
+
+
+/*************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************/
+cpu_init_crit:
+ /*
+ * Invalidate L1 I/D
+ */
+ mov r0, #0 @ set up for MCR
+ mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
+
+ /*
+ * disable MMU stuff and caches
+ */
+ mrc p15, 0, r0, c1, c0, 0
+ bic r0, r0, #0x00002000 @ clear bits 13 (--V-)
+ bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM)
+ orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align
+ orr r0, r0, #0x00000800 @ set bit 12 (Z---) BTB
+ mcr p15, 0, r0, c1, c0, 0
+
+ /*
+ * Jump to board specific initialization...
+ * The Mask ROM will have already initialized
+ * basic memory. Go here to bump up clock rate and handle
+ * wake up conditions.
+ */
+ mov ip, lr @ persevere link reg across call
+ bl lowlevel_init @ go setup pll,mux,memory
+ mov lr, ip @ restore link
+ mov pc, lr @ back to my caller
+/*
+ *************************************************************************
+ *
+ * Interrupt handling
+ *
+ *************************************************************************
+ */
+@
+@ IRQ stack frame.
+@
+#define S_FRAME_SIZE 72
+
+#define S_OLD_R0 68
+#define S_PSR 64
+#define S_PC 60
+#define S_LR 56
+#define S_SP 52
+
+#define S_IP 48
+#define S_FP 44
+#define S_R10 40
+#define S_R9 36
+#define S_R8 32
+#define S_R7 28
+#define S_R6 24
+#define S_R5 20
+#define S_R4 16
+#define S_R3 12
+#define S_R2 8
+#define S_R1 4
+#define S_R0 0
+
+#define MODE_SVC 0x13
+#define I_BIT 0x80
+
+/*
+ * use bad_save_user_regs for abort/prefetch/undef/swi ...
+ * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
+ */
+
+ .macro bad_save_user_regs
+ sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current
+ @ user stack
+ stmia sp, {r0 - r12} @ Save user registers (now in
+ @ svc mode) r0-r12
+
+ ldr r2, _armboot_start
+ sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
+ sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort
+ @ stack
+ ldmia r2, {r2 - r3} @ get values for "aborted" pc
+ @ and cpsr (into parm regs)
+ add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
+
+ add r5, sp, #S_SP
+ mov r1, lr
+ stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
+ mov r0, sp @ save current stack into r0
+ @ (param register)
+ .endm
+
+ .macro irq_save_user_regs
+ sub sp, sp, #S_FRAME_SIZE
+ stmia sp, {r0 - r12} @ Calling r0-r12
+ add r8, sp, #S_PC @ !! R8 NEEDS to be saved !!
+ @ a reserved stack spot would
+ @ be good.
+ stmdb r8, {sp, lr}^ @ Calling SP, LR
+ str lr, [r8, #0] @ Save calling PC
+ mrs r6, spsr
+ str r6, [r8, #4] @ Save CPSR
+ str r0, [r8, #8] @ Save OLD_R0
+ mov r0, sp
+ .endm
+
+ .macro irq_restore_user_regs
+ ldmia sp, {r0 - lr}^ @ Calling r0 - lr
+ mov r0, r0
+ ldr lr, [sp, #S_PC] @ Get PC
+ add sp, sp, #S_FRAME_SIZE
+ subs pc, lr, #4 @ return & move spsr_svc into
+ @ cpsr
+ .endm
+
+ .macro get_bad_stack
+ ldr r13, _armboot_start @ setup our mode stack (enter
+ @ in banked mode)
+ sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
+ sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move to reserved a couple
+ @ spots for abort stack
+
+ str lr, [r13] @ save caller lr in position 0
+ @ of saved stack
+ mrs lr, spsr @ get the spsr
+ str lr, [r13, #4] @ save spsr in position 1 of
+ @ saved stack
+
+ mov r13, #MODE_SVC @ prepare SVC-Mode
+ @ msr spsr_c, r13
+ msr spsr, r13 @ switch modes, make sure
+ @ moves will execute
+ mov lr, pc @ capture return pc
+ movs pc, lr @ jump to next instruction &
+ @ switch modes.
+ .endm
+
+ .macro get_bad_stack_swi
+ sub r13, r13, #4 @ space on current stack for
+ @ scratch reg.
+ str r0, [r13] @ save R0's value.
+ ldr r0, _armboot_start @ get data regions start
+ sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
+ sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move past gbl and a couple
+ @ spots for abort stack
+ str lr, [r0] @ save caller lr in position 0
+ @ of saved stack
+ mrs r0, spsr @ get the spsr
+ str lr, [r0, #4] @ save spsr in position 1 of
+ @ saved stack
+ ldr r0, [r13] @ restore r0
+ add r13, r13, #4 @ pop stack entry
+ .endm
+
+ .macro get_irq_stack @ setup IRQ stack
+ ldr sp, IRQ_STACK_START
+ .endm
+
+ .macro get_fiq_stack @ setup FIQ stack
+ ldr sp, FIQ_STACK_START
+ .endm
+
+/*
+ * exception handlers
+ */
+ .align 5
+undefined_instruction:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_undefined_instruction
+
+ .align 5
+software_interrupt:
+ get_bad_stack_swi
+ bad_save_user_regs
+ bl do_software_interrupt
+
+ .align 5
+prefetch_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_prefetch_abort
+
+ .align 5
+data_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_data_abort
+
+ .align 5
+not_used:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_not_used
+
+#ifdef CONFIG_USE_IRQ
+
+ .align 5
+irq:
+ get_irq_stack
+ irq_save_user_regs
+ bl do_irq
+ irq_restore_user_regs
+
+ .align 5
+fiq:
+ get_fiq_stack
+ /* someone ought to write a more effiction fiq_save_user_regs */
+ irq_save_user_regs
+ bl do_fiq
+ irq_restore_user_regs
+
+#else
+
+ .align 5
+irq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_irq
+
+ .align 5
+fiq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_fiq
+
+#endif
+ .align 5
+.global arm_cache_flush
+arm_cache_flush:
+ mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
+ mov pc, lr @ back to caller
+
+/*
+ * v7_flush_dcache_all()
+ *
+ * Flush the whole D-cache.
+ *
+ * Corrupted registers: r0-r5, r7, r9-r11
+ *
+ * - mm - mm_struct describing address space
+ */
+ .align 5
+.global v7_flush_dcache_all
+v7_flush_dcache_all:
+ stmfd r13!, {r0-r5, r7, r9-r12,r14}
+
+ mov r7, r0 @ take a backup of device type
+ cmp r0, #0x3 @ check if the device type is
+ @ GP
+ moveq r12, #0x1 @ set up to invalide L2
+smi: .word 0x01600070 @ Call SMI monitor (smieq)
+ cmp r7, #0x3 @ compare again in case its
+ @ lost
+ beq finished_inval @ if GP device, inval done
+ @ above
+
+ mrc p15, 1, r0, c0, c0, 1 @ read clidr
+ ands r3, r0, #0x7000000 @ extract loc from clidr
+ mov r3, r3, lsr #23 @ left align loc bit field
+ beq finished_inval @ if loc is 0, then no need to
+ @ clean
+ mov r10, #0 @ start clean at cache level 0
+inval_loop1:
+ add r2, r10, r10, lsr #1 @ work out 3x current cache
+ @ level
+ mov r1, r0, lsr r2 @ extract cache type bits from
+ @ clidr
+ and r1, r1, #7 @ mask of the bits for current
+ @ cache only
+ cmp r1, #2 @ see what cache we have at
+ @ this level
+ blt skip_inval @ skip if no cache, or just
+ @ i-cache
+ mcr p15, 2, r10, c0, c0, 0 @ select current cache level
+ @ in cssr
+ mov r2, #0 @ operand for mcr SBZ
+ mcr p15, 0, r2, c7, c5, 4 @ flush prefetch buffer to
+ @ sych the new cssr&csidr,
+ @ with armv7 this is 'isb',
+ @ but we compile with armv5
+ mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
+ and r2, r1, #7 @ extract the length of the
+ @ cache lines
+ add r2, r2, #4 @ add 4 (line length offset)
+ ldr r4, =0x3ff
+ ands r4, r4, r1, lsr #3 @ find maximum number on the
+ @ way size
+ clz r5, r4 @ find bit position of way
+ @ size increment
+ ldr r7, =0x7fff
+ ands r7, r7, r1, lsr #13 @ extract max number of the
+ @ index size
+inval_loop2:
+ mov r9, r4 @ create working copy of max
+ @ way size
+inval_loop3:
+ orr r11, r10, r9, lsl r5 @ factor way and cache number
+ @ into r11
+ orr r11, r11, r7, lsl r2 @ factor index number into r11
+ mcr p15, 0, r11, c7, c6, 2 @ invalidate by set/way
+ subs r9, r9, #1 @ decrement the way
+ bge inval_loop3
+ subs r7, r7, #1 @ decrement the index
+ bge inval_loop2
+skip_inval:
+ add r10, r10, #2 @ increment cache number
+ cmp r3, r10
+ bgt inval_loop1
+finished_inval:
+ mov r10, #0 @ swith back to cache level 0
+ mcr p15, 2, r10, c0, c0, 0 @ select current cache level
+ @ in cssr
+ mcr p15, 0, r10, c7, c5, 4 @ flush prefetch buffer,
+ @ with armv7 this is 'isb',
+ @ but we compile with armv5
+
+ ldmfd r13!, {r0-r5, r7, r9-r12,pc}
+
+
+ .align 5
+.global reset_cpu
+reset_cpu:
+ ldr r1, rstctl @ get addr for global reset
+ @ reg
+ mov r3, #0x2 @ full reset pll + mpu
+ str r3, [r1] @ force reset
+ mov r0, r0
+_loop_forever:
+ b _loop_forever
+rstctl:
+ .word PRM_RSTCTRL
+
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