2008-02-08 19:19:31 +07:00
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###############################################################################
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#
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# MN10300 On-chip serial Rx interrupt handler for GDB stub I/O
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#
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# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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# Written by David Howells (dhowells@redhat.com)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public Licence
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# as published by the Free Software Foundation; either version
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# 2 of the Licence, or (at your option) any later version.
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#
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###############################################################################
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/smp.h>
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#include <asm/thread_info.h>
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#include <asm/cpu-regs.h>
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#include <asm/frame.inc>
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#include <asm/intctl-regs.h>
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2009-04-10 20:33:48 +07:00
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#include <unit/serial.h>
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2008-02-08 19:19:31 +07:00
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#include "mn10300-serial.h"
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.text
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###############################################################################
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#
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# GDB stub serial receive interrupt entry point
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# - intended to run at interrupt priority 0
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#
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###############################################################################
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.globl gdbstub_io_rx_handler
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.type gdbstub_io_rx_handler,@function
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gdbstub_io_rx_handler:
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movm [d2,d3,a2,a3],(sp)
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mov (gdbstub_rx_inp),a3
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gdbstub_io_rx_more:
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mov a3,a2
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add 2,a3
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and PAGE_SIZE_asm-1,a3
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mov (gdbstub_rx_outp),d3
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cmp a3,d3
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beq gdbstub_io_rx_overflow
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movbu (SCgSTR),d3
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btst SC01STR_RBF,d3
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beq gdbstub_io_rx_done
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movbu (SCgRXB),d2
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movbu d3,(gdbstub_rx_buffer+1,a2)
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movbu d2,(gdbstub_rx_buffer,a2)
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mov a3,(gdbstub_rx_inp)
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bra gdbstub_io_rx_more
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gdbstub_io_rx_done:
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mov GxICR_DETECT,d2
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movbu d2,(GxICR(SCgRXIRQ)) # ACK the interrupt
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movhu (GxICR(SCgRXIRQ)),d2 # flush
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movm (sp),[d2,d3,a2,a3]
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bset 0x01,(gdbstub_busy)
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beq gdbstub_io_rx_enter
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rti
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gdbstub_io_rx_overflow:
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bset 0x01,(gdbstub_rx_overflow)
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bra gdbstub_io_rx_done
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###############################################################################
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#
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# debugging interrupt - enter the GDB stub proper
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#
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###############################################################################
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gdbstub_io_rx_enter:
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or EPSW_IE|EPSW_IM_1,epsw
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add -4,sp
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SAVE_ALL
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mov 0xffffffff,d0
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mov d0,(REG_ORIG_D0,fp)
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mov 0x280,d1
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mov fp,d0
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call gdbstub_rx_irq[],0 # gdbstub_io_rx_irq(regs,excep)
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and ~EPSW_IE,epsw
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bclr 0x01,(gdbstub_busy)
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.globl gdbstub_return
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gdbstub_return:
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RESTORE_ALL
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.size gdbstub_io_rx_handler,.-gdbstub_io_rx_handler
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