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b920de1b DH |
1 | ############################################################################### |
2 | # | |
3 | # 16550 serial Rx interrupt handler for gdbstub I/O | |
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/smp.h> | |
17 | #include <asm/cpu-regs.h> | |
18 | #include <asm/thread_info.h> | |
19 | #include <asm/frame.inc> | |
20 | #include <asm/intctl-regs.h> | |
21 | #include <asm/unit/serial.h> | |
22 | ||
23 | .text | |
24 | ||
25 | ############################################################################### | |
26 | # | |
27 | # GDB stub serial receive interrupt entry point | |
28 | # - intended to run at interrupt priority 0 | |
29 | # | |
30 | ############################################################################### | |
31 | .globl gdbstub_io_rx_handler | |
32 | .type gdbstub_io_rx_handler,@function | |
33 | gdbstub_io_rx_handler: | |
34 | movm [d2,d3,a2,a3],(sp) | |
35 | ||
36 | #if 1 | |
37 | movbu (GDBPORT_SERIAL_IIR),d2 | |
38 | #endif | |
39 | ||
40 | mov (gdbstub_rx_inp),a3 | |
41 | gdbstub_io_rx_more: | |
42 | mov a3,a2 | |
43 | add 2,a3 | |
44 | and 0x00000fff,a3 | |
45 | mov (gdbstub_rx_outp),d3 | |
46 | cmp a3,d3 | |
47 | beq gdbstub_io_rx_overflow | |
48 | ||
49 | movbu (GDBPORT_SERIAL_LSR),d3 | |
50 | btst UART_LSR_DR,d3 | |
51 | beq gdbstub_io_rx_done | |
52 | movbu (GDBPORT_SERIAL_RX),d2 | |
53 | movbu d3,(gdbstub_rx_buffer+1,a2) | |
54 | movbu d2,(gdbstub_rx_buffer,a2) | |
55 | mov a3,(gdbstub_rx_inp) | |
56 | bra gdbstub_io_rx_more | |
57 | ||
58 | gdbstub_io_rx_done: | |
59 | mov GxICR_DETECT,d2 | |
60 | movbu d2,(XIRQxICR(GDBPORT_SERIAL_IRQ)) # ACK the interrupt | |
61 | movhu (XIRQxICR(GDBPORT_SERIAL_IRQ)),d2 # flush | |
62 | movm (sp),[d2,d3,a2,a3] | |
63 | bset 0x01,(gdbstub_busy) | |
64 | beq gdbstub_io_rx_enter | |
65 | rti | |
66 | ||
67 | gdbstub_io_rx_overflow: | |
68 | bset 0x01,(gdbstub_rx_overflow) | |
69 | bra gdbstub_io_rx_done | |
70 | ||
71 | gdbstub_io_rx_enter: | |
72 | or EPSW_IE|EPSW_IM_1,epsw | |
73 | add -4,sp | |
74 | SAVE_ALL | |
75 | ||
76 | mov 0xffffffff,d0 | |
77 | mov d0,(REG_ORIG_D0,fp) | |
78 | mov 0x280,d1 | |
79 | ||
80 | mov fp,d0 | |
81 | call gdbstub_rx_irq[],0 # gdbstub_rx_irq(regs,excep) | |
82 | ||
83 | and ~EPSW_IE,epsw | |
84 | bclr 0x01,(gdbstub_busy) | |
85 | ||
86 | .globl gdbstub_return | |
87 | gdbstub_return: | |
88 | RESTORE_ALL | |
89 | ||
90 | .size gdbstub_io_rx_handler,.-gdbstub_io_rx_handler |