[PATCH] avr32 architecture
This adds support for the Atmel AVR32 architecture as well as the AT32AP7000
CPU and the AT32STK1000 development board.
AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for
cost-sensitive embedded applications, with particular emphasis on low power
consumption and high code density. The AVR32 architecture is not binary
compatible with earlier 8-bit AVR architectures.
The AVR32 architecture, including the instruction set, is described by the
AVR32 Architecture Manual, available from
http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf
The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture. It
features a 7-stage pipeline, 16KB instruction and data caches and a full
Memory Management Unit. It also comes with a large set of integrated
peripherals, many of which are shared with the AT91 ARM-based controllers from
Atmel.
Full data sheet is available from
http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf
while the CPU core implementation including caches and MMU is documented by
the AVR32 AP Technical Reference, available from
http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf
Information about the AT32STK1000 development board can be found at
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918
including a BSP CD image with an earlier version of this patch, development
tools (binaries and source/patches) and a root filesystem image suitable for
booting from SD card.
Alternatively, there's a preliminary "getting started" guide available at
http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links
to the sources and patches you will need in order to set up a cross-compiling
environment for avr32-linux.
This patch, as well as the other patches included with the BSP and the
toolchain patches, is actively supported by Atmel Corporation.
[dmccr@us.ibm.com: Fix more pxx_page macro locations]
[bunk@stusta.de: fix `make defconfig']
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
new file mode 100644
index 0000000..7e803f4
--- /dev/null
+++ b/arch/avr32/kernel/traps.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#undef DEBUG
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/notifier.h>
+
+#include <asm/traps.h>
+#include <asm/sysreg.h>
+#include <asm/addrspace.h>
+#include <asm/ocd.h>
+#include <asm/mmu_context.h>
+#include <asm/uaccess.h>
+
+static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
+{
+ unsigned long p;
+ int i;
+
+ printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
+
+ for (p = bottom & ~31; p < top; ) {
+ printk("%04lx: ", p & 0xffff);
+
+ for (i = 0; i < 8; i++, p += 4) {
+ unsigned int val;
+
+ if (p < bottom || p >= top)
+ printk(" ");
+ else {
+ if (__get_user(val, (unsigned int __user *)p)) {
+ printk("\n");
+ goto out;
+ }
+ printk("%08x ", val);
+ }
+ }
+ printk("\n");
+ }
+
+out:
+ return;
+}
+
+#ifdef CONFIG_FRAME_POINTER
+static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
+ struct pt_regs *regs)
+{
+ unsigned long __user *fp;
+ unsigned long __user *last_fp = NULL;
+
+ if (regs) {
+ fp = (unsigned long __user *)regs->r7;
+ } else if (tsk == current) {
+ register unsigned long __user *real_fp __asm__("r7");
+ fp = real_fp;
+ } else {
+ fp = (unsigned long __user *)tsk->thread.cpu_context.r7;
+ }
+
+ /*
+ * Walk the stack until (a) we get an exception, (b) the frame
+ * pointer becomes zero, or (c) the frame pointer gets stuck
+ * at the same value.
+ */
+ while (fp && fp != last_fp) {
+ unsigned long lr, new_fp = 0;
+
+ last_fp = fp;
+ if (__get_user(lr, fp))
+ break;
+ if (fp && __get_user(new_fp, fp + 1))
+ break;
+ fp = (unsigned long __user *)new_fp;
+
+ printk(" [<%08lx>] ", lr);
+ print_symbol("%s\n", lr);
+ }
+ printk("\n");
+}
+#else
+static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
+ struct pt_regs *regs)
+{
+ unsigned long addr;
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (kernel_text_address(addr)) {
+ printk(" [<%08lx>] ", addr);
+ print_symbol("%s\n", addr);
+ }
+ }
+}
+#endif
+
+void show_trace(struct task_struct *tsk, unsigned long *sp,
+ struct pt_regs *regs)
+{
+ if (regs &&
+ (((regs->sr & MODE_MASK) == MODE_EXCEPTION) ||
+ ((regs->sr & MODE_MASK) == MODE_USER)))
+ return;
+
+ printk ("Call trace:");
+#ifdef CONFIG_KALLSYMS
+ printk("\n");
+#endif
+
+ __show_trace(tsk, sp, regs);
+ printk("\n");
+}
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+ unsigned long stack;
+
+ if (!tsk)
+ tsk = current;
+ if (sp == 0) {
+ if (tsk == current) {
+ register unsigned long *real_sp __asm__("sp");
+ sp = real_sp;
+ } else {
+ sp = (unsigned long *)tsk->thread.cpu_context.ksp;
+ }
+ }
+
+ stack = (unsigned long)sp;
+ dump_mem("Stack: ", stack,
+ THREAD_SIZE + (unsigned long)tsk->thread_info);
+ show_trace(tsk, sp, NULL);
+}
+
+void dump_stack(void)
+{
+ show_stack(NULL, NULL);
+}
+EXPORT_SYMBOL(dump_stack);
+
+ATOMIC_NOTIFIER_HEAD(avr32_die_chain);
+
+int register_die_notifier(struct notifier_block *nb)
+{
+ pr_debug("register_die_notifier: %p\n", nb);
+
+ return atomic_notifier_chain_register(&avr32_die_chain, nb);
+}
+EXPORT_SYMBOL(register_die_notifier);
+
+int unregister_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&avr32_die_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier);
+
+static DEFINE_SPINLOCK(die_lock);
+
+void __die(const char *str, struct pt_regs *regs, unsigned long err,
+ const char *file, const char *func, unsigned long line)
+{
+ struct task_struct *tsk = current;
+ static int die_counter;
+
+ console_verbose();
+ spin_lock_irq(&die_lock);
+ bust_spinlocks(1);
+
+ printk(KERN_ALERT "%s", str);
+ if (file && func)
+ printk(" in %s:%s, line %ld", file, func, line);
+ printk("[#%d]:\n", ++die_counter);
+ print_modules();
+ show_regs(regs);
+ printk("Process %s (pid: %d, stack limit = 0x%p)\n",
+ tsk->comm, tsk->pid, tsk->thread_info + 1);
+
+ if (!user_mode(regs) || in_interrupt()) {
+ dump_mem("Stack: ", regs->sp,
+ THREAD_SIZE + (unsigned long)tsk->thread_info);
+ }
+
+ bust_spinlocks(0);
+ spin_unlock_irq(&die_lock);
+ do_exit(SIGSEGV);
+}
+
+void __die_if_kernel(const char *str, struct pt_regs *regs, unsigned long err,
+ const char *file, const char *func, unsigned long line)
+{
+ if (!user_mode(regs))
+ __die(str, regs, err, file, func, line);
+}
+
+asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
+{
+#ifdef CONFIG_SUBARCH_AVR32B
+ /*
+ * The exception entry always saves RSR_EX. For NMI, this is
+ * wrong; it should be RSR_NMI
+ */
+ regs->sr = sysreg_read(RSR_NMI);
+#endif
+
+ printk("NMI taken!!!!\n");
+ die("NMI", regs, ecr);
+ BUG();
+}
+
+asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
+{
+ printk("Unable to handle critical exception %lu at pc = %08lx!\n",
+ ecr, regs->pc);
+ die("Oops", regs, ecr);
+ BUG();
+}
+
+asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
+{
+ siginfo_t info;
+
+ die_if_kernel("Oops: Address exception in kernel mode", regs, ecr);
+
+#ifdef DEBUG
+ if (ecr == ECR_ADDR_ALIGN_X)
+ pr_debug("Instruction Address Exception at pc = %08lx\n",
+ regs->pc);
+ else if (ecr == ECR_ADDR_ALIGN_R)
+ pr_debug("Data Address Exception (Read) at pc = %08lx\n",
+ regs->pc);
+ else if (ecr == ECR_ADDR_ALIGN_W)
+ pr_debug("Data Address Exception (Write) at pc = %08lx\n",
+ regs->pc);
+ else
+ BUG();
+
+ show_regs(regs);
+#endif
+
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRALN;
+ info.si_addr = (void __user *)regs->pc;
+
+ force_sig_info(SIGBUS, &info, current);
+}
+
+/* This way of handling undefined instructions is stolen from ARM */
+static LIST_HEAD(undef_hook);
+static spinlock_t undef_lock = SPIN_LOCK_UNLOCKED;
+
+void register_undef_hook(struct undef_hook *hook)
+{
+ spin_lock_irq(&undef_lock);
+ list_add(&hook->node, &undef_hook);
+ spin_unlock_irq(&undef_lock);
+}
+
+void unregister_undef_hook(struct undef_hook *hook)
+{
+ spin_lock_irq(&undef_lock);
+ list_del(&hook->node);
+ spin_unlock_irq(&undef_lock);
+}
+
+static int do_cop_absent(u32 insn)
+{
+ int cop_nr;
+ u32 cpucr;
+ if ( (insn & 0xfdf00000) == 0xf1900000 )
+ /* LDC0 */
+ cop_nr = 0;
+ else
+ cop_nr = (insn >> 13) & 0x7;
+
+ /* Try enabling the coprocessor */
+ cpucr = sysreg_read(CPUCR);
+ cpucr |= (1 << (24 + cop_nr));
+ sysreg_write(CPUCR, cpucr);
+
+ cpucr = sysreg_read(CPUCR);
+ if ( !(cpucr & (1 << (24 + cop_nr))) ){
+ printk("Coprocessor #%i not found!\n", cop_nr);
+ return -1;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_BUG
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
+{
+ char *file;
+ u16 line;
+ char c;
+
+ if (__get_user(line, (u16 __user *)(regs->pc + 2)))
+ return;
+ if (__get_user(file, (char * __user *)(regs->pc + 4))
+ || (unsigned long)file < PAGE_OFFSET
+ || __get_user(c, file))
+ file = "<bad filename>";
+
+ printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
+}
+#else
+static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
+{
+
+}
+#endif
+#endif
+
+asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
+{
+ u32 insn;
+ struct undef_hook *hook;
+ siginfo_t info;
+ void __user *pc;
+
+ if (!user_mode(regs))
+ goto kernel_trap;
+
+ local_irq_enable();
+
+ pc = (void __user *)instruction_pointer(regs);
+ if (__get_user(insn, (u32 __user *)pc))
+ goto invalid_area;
+
+ if (ecr == ECR_COPROC_ABSENT) {
+ if (do_cop_absent(insn) == 0)
+ return;
+ }
+
+ spin_lock_irq(&undef_lock);
+ list_for_each_entry(hook, &undef_hook, node) {
+ if ((insn & hook->insn_mask) == hook->insn_val) {
+ if (hook->fn(regs, insn) == 0) {
+ spin_unlock_irq(&undef_lock);
+ return;
+ }
+ }
+ }
+ spin_unlock_irq(&undef_lock);
+
+invalid_area:
+
+#ifdef DEBUG
+ printk("Illegal instruction at pc = %08lx\n", regs->pc);
+ if (regs->pc < TASK_SIZE) {
+ unsigned long ptbr, pgd, pte, *p;
+
+ ptbr = sysreg_read(PTBR);
+ p = (unsigned long *)ptbr;
+ pgd = p[regs->pc >> 22];
+ p = (unsigned long *)((pgd & 0x1ffff000) | 0x80000000);
+ pte = p[(regs->pc >> 12) & 0x3ff];
+ printk("page table: 0x%08lx -> 0x%08lx -> 0x%08lx\n", ptbr, pgd, pte);
+ }
+#endif
+
+ info.si_signo = SIGILL;
+ info.si_errno = 0;
+ info.si_addr = (void __user *)regs->pc;
+ switch (ecr) {
+ case ECR_ILLEGAL_OPCODE:
+ case ECR_UNIMPL_INSTRUCTION:
+ info.si_code = ILL_ILLOPC;
+ break;
+ case ECR_PRIVILEGE_VIOLATION:
+ info.si_code = ILL_PRVOPC;
+ break;
+ case ECR_COPROC_ABSENT:
+ info.si_code = ILL_COPROC;
+ break;
+ default:
+ BUG();
+ }
+
+ force_sig_info(SIGILL, &info, current);
+ return;
+
+kernel_trap:
+#ifdef CONFIG_BUG
+ if (__kernel_text_address(instruction_pointer(regs))) {
+ insn = *(u16 *)instruction_pointer(regs);
+ if (insn == AVR32_BUG_OPCODE) {
+ do_bug_verbose(regs, insn);
+ die("Kernel BUG", regs, 0);
+ return;
+ }
+ }
+#endif
+
+ die("Oops: Illegal instruction in kernel code", regs, ecr);
+}
+
+asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
+{
+ siginfo_t info;
+
+ printk("Floating-point exception at pc = %08lx\n", regs->pc);
+
+ /* We have no FPU... */
+ info.si_signo = SIGILL;
+ info.si_errno = 0;
+ info.si_addr = (void __user *)regs->pc;
+ info.si_code = ILL_COPROC;
+
+ force_sig_info(SIGILL, &info, current);
+}
+
+
+void __init trap_init(void)
+{
+
+}