diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2009-11-24 01:24:58 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-12-17 01:57:30 +0000 |
| commit | 69f3a7de1f1ec935924b1b13f83812f8b30e92ce (patch) | |
| tree | a5f8a71b9cb3026a44ae7a1564488de8c3d8d2a9 /arch/mips/kernel/traps.c | |
| parent | 4dd92e15b316d1a782772f16074571a70ceb9184 (diff) | |
MIPS: Modularize COP2 handling
Away with the daemons of ifdef; get ready for future COP2 users.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/708/
Diffstat (limited to 'arch/mips/kernel/traps.c')
| -rw-r--r-- | arch/mips/kernel/traps.c | 60 |
1 files changed, 45 insertions, 15 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 0a18b4c62af..9fe21fb6530 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -25,10 +25,12 @@ #include <linux/ptrace.h> #include <linux/kgdb.h> #include <linux/kdebug.h> +#include <linux/notifier.h> #include <asm/bootinfo.h> #include <asm/branch.h> #include <asm/break.h> +#include <asm/cop2.h> #include <asm/cpu.h> #include <asm/dsp.h> #include <asm/fpu.h> @@ -79,10 +81,6 @@ extern asmlinkage void handle_reserved(void); extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx, int has_fpu); -#ifdef CONFIG_CPU_CAVIUM_OCTEON -extern asmlinkage void octeon_cop2_restore(struct octeon_cop2_state *task); -#endif - void (*board_be_init)(void); int (*board_be_handler)(struct pt_regs *regs, int is_fixup); void (*board_nmi_handler_setup)(void); @@ -857,6 +855,44 @@ static void mt_ase_fp_affinity(void) #endif /* CONFIG_MIPS_MT_FPAFF */ } +/* + * No lock; only written during early bootup by CPU 0. + */ +static RAW_NOTIFIER_HEAD(cu2_chain); + +int __ref register_cu2_notifier(struct notifier_block *nb) +{ + return raw_notifier_chain_register(&cu2_chain, nb); +} + +int cu2_notifier_call_chain(unsigned long val, void *v) +{ + return raw_notifier_call_chain(&cu2_chain, val, v); +} + +static int default_cu2_call(struct notifier_block *nfb, unsigned long action, + void *data) +{ + struct pt_regs *regs = data; + + switch (action) { + default: + die_if_kernel("Unhandled kernel unaligned access or invalid " + "instruction", regs); + /* Fall through */ + + case CU2_EXCEPTION: + force_sig(SIGILL, current); + } + + return NOTIFY_OK; +} + +static struct notifier_block default_cu2_notifier = { + .notifier_call = default_cu2_call, + .priority = 0x80000000, /* Run last */ +}; + asmlinkage void do_cpu(struct pt_regs *regs) { unsigned int __user *epc; @@ -920,17 +956,9 @@ asmlinkage void do_cpu(struct pt_regs *regs) return; case 2: -#ifdef CONFIG_CPU_CAVIUM_OCTEON - prefetch(¤t->thread.cp2); - local_irq_save(flags); - KSTK_STATUS(current) |= ST0_CU2; - status = read_c0_status(); - write_c0_status(status | ST0_CU2); - octeon_cop2_restore(&(current->thread.cp2)); - write_c0_status(status & ~ST0_CU2); - local_irq_restore(flags); - return; -#endif + raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs); + break; + case 3: break; } @@ -1760,4 +1788,6 @@ void __init trap_init(void) flush_tlb_handlers(); sort_extable(__start___dbe_table, __stop___dbe_table); + + register_cu2_notifier(&default_cu2_notifier); } |