diff options
| author | David Daney <ddaney@caviumnetworks.com> | 2008-12-11 15:33:23 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-01-11 09:57:21 +0000 |
| commit | f9bb4cf37ad3f7dec63abc5db688dd1e9df0056c (patch) | |
| tree | 6b9cb7a48fd3c3e1971c1c28a06d6a425f2e825f /arch/mips | |
| parent | bd6d85c21a5adf24567fdb235aa8e7c8c95d5847 (diff) | |
| download | talos-obmc-linux-f9bb4cf37ad3f7dec63abc5db688dd1e9df0056c.tar.gz talos-obmc-linux-f9bb4cf37ad3f7dec63abc5db688dd1e9df0056c.zip | |
MIPS: For Cavium OCTEON set hwrena and lazily restore CP2 state.
If on Cavium, be aware of cop2 and hwrena during do_cpu().
Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: Paul Gortmaker <Paul.Gortmaker@windriver.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/traps.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 353056110f2b..f6083c6bfaa4 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -47,6 +47,7 @@ #include <asm/mmu_context.h> #include <asm/types.h> #include <asm/stacktrace.h> +#include <asm/irq.h> extern void check_wait(void); extern asmlinkage void r4k_wait(void); @@ -78,6 +79,10 @@ 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); @@ -860,6 +865,7 @@ asmlinkage void do_cpu(struct pt_regs *regs) unsigned int opcode; unsigned int cpid; int status; + unsigned long __maybe_unused flags; die_if_kernel("do_cpu invoked from kernel context!", regs); @@ -915,6 +921,17 @@ 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 case 3: break; } @@ -1488,6 +1505,10 @@ void __cpuinit per_cpu_trap_init(void) write_c0_hwrena(enable); } +#ifdef CONFIG_CPU_CAVIUM_OCTEON + write_c0_hwrena(0xc000000f); /* Octeon has register 30 and 31 */ +#endif + #ifdef CONFIG_MIPS_MT_SMTC if (!secondaryTC) { #endif /* CONFIG_MIPS_MT_SMTC */ |
