projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b920de1b DH |
1 | ############################################################################### |
| 2 | # | |
| 3 | # Fast profiling interrupt handler | |
| 4 | # | |
| 5 | # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
| 6 | # Written by David Howells (dhowells@redhat.com) | |
| 7 | # | |
| 8 | # This program is free software; you can redistribute it and/or | |
| 9 | # modify it under the terms of the GNU General Public Licence | |
| 10 | # as published by the Free Software Foundation; either version | |
| 11 | # 2 of the Licence, or (at your option) any later version. | |
| 12 | # | |
| 13 | ############################################################################### | |
| 14 | #include <linux/sys.h> | |
| 15 | #include <linux/linkage.h> | |
| 16 | #include <asm/segment.h> | |
| 17 | #include <asm/smp.h> | |
| 18 | #include <asm/intctl-regs.h> | |
| 19 | #include <asm/timer-regs.h> | |
| 20 | ||
| 21 | #define pi break | |
| 22 | ||
| 23 | .balign 4 | |
| 24 | counter: | |
| 25 | .long -1 | |
| 26 | ||
| 27 | ############################################################################### | |
| 28 | # | |
| 29 | # Profiling interrupt entry point | |
| 30 | # - intended to run at interrupt priority 1 | |
| 31 | # | |
| 32 | ############################################################################### | |
| 33 | ENTRY(profile_handler) | |
| 34 | movm [d2,d3,a2],(sp) | |
| 35 | ||
| 36 | # ignore userspace | |
| 37 | mov (12,sp),d2 | |
| 38 | and EPSW_nSL,d2 | |
| 39 | bne out | |
| 40 | ||
| 41 | # do nothing if there's no buffer | |
| 42 | mov (prof_buffer),a2 | |
| 43 | and a2,a2 | |
| 44 | beq out | |
| 45 | or 0x20000000,a2 | |
| 46 | ||
| 47 | # calculate relative position in text segment | |
| 48 | mov (16,sp),d2 | |
| 49 | sub _stext,d2 | |
| 50 | mov (prof_shift),d3 | |
| 51 | lsr d3,d2 | |
| 52 | mov (prof_len),d3 | |
| 53 | cmp d3,d2 | |
| 54 | bcc outside_text | |
| 55 | ||
| 56 | # increment the appropriate profile bucket | |
| 57 | do_inc: | |
| 58 | asl2 d2 | |
| 59 | mov (a2,d2),d3 | |
| 60 | inc d3 | |
| 61 | mov d3,(a2,d2) | |
| 62 | out: | |
| 63 | mov GxICR_DETECT,d2 | |
| 64 | movbu d2,(TM11ICR) # ACK the interrupt | |
| 65 | movbu (TM11ICR),d2 | |
| 66 | movm (sp),[d2,d3,a2] | |
| 67 | rti | |
| 68 | ||
| 69 | outside_text: | |
| 70 | sub 1,d3 | |
| 71 | mov d3,d2 | |
| 72 | bra do_inc |