diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 15:12:19 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-15 23:15:51 +0530 |
| commit | f1f3347da9440eedd2350f4f5d13d8860f570b92 (patch) | |
| tree | 47d652aeaf9c4455d085578c976c73789620ba8c /arch/arc/include/asm/arcregs.h | |
| parent | 5dda4dc570ac41e3bd73ef871c500aeb7005c6b0 (diff) | |
ARC: MMU Context Management
ARC700 MMU provides for tagging TLB entries with a 8-bit ASID to avoid
having to flush the TLB every task switch.
It also allows for a quick way to invalidate all the TLB entries for
task useful for:
* COW sementics during fork()
* task exit()ing
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/asm/arcregs.h')
| -rw-r--r-- | arch/arc/include/asm/arcregs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index c6e28053fb70..c12eb9b4f449 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -85,6 +85,13 @@ #define DC_CTRL_INV_MODE_FLUSH 0x40 #define DC_CTRL_FLUSH_STATUS 0x100 +/* MMU Management regs */ +#define ARC_REG_PID 0x409 +#define ARC_REG_SCRATCH_DATA0 0x418 + +/* Bits in MMU PID register */ +#define MMU_ENABLE (1 << 31) /* Enable MMU for process */ + /* * Floating Pt Registers * Status regs are read-only (build-time) so need not be saved/restored |