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49316cbf0a
They tend to get not updated when files are moved around or copied and lack any obvious use. While at it zap some only too obvious comments and as per Shinya's suggestion, add a copyright header to extable.c. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Acked-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
291 lines
7.4 KiB
ArmAsm
291 lines
7.4 KiB
ArmAsm
/*
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* Copyright (C) 1995, 1996, 1997 Paul M. Antoine and Harald Koerfgen
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* Copyright (C) 2000, 2001, 2002, 2003, 2005 Maciej W. Rozycki
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*
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* Written by Ralf Baechle and Andreas Busse, modified for DECstation
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* support by Paul Antoine and Harald Koerfgen.
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*
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* completly rewritten:
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* Copyright (C) 1998 Harald Koerfgen
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*
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* Rewritten extensively for controller-driven IRQ support
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* by Maciej W. Rozycki.
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*/
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#include <asm/addrspace.h>
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#include <asm/asm.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/dec/interrupts.h>
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#include <asm/dec/ioasic_addrs.h>
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#include <asm/dec/ioasic_ints.h>
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#include <asm/dec/kn01.h>
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#include <asm/dec/kn02.h>
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#include <asm/dec/kn02xa.h>
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#include <asm/dec/kn03.h>
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#define KN02_CSR_BASE CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR)
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#define KN02XA_IOASIC_BASE CKSEG1ADDR(KN02XA_SLOT_BASE + IOASIC_IOCTL)
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#define KN03_IOASIC_BASE CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_IOCTL)
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.text
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.set noreorder
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/*
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* plat_irq_dispatch: Interrupt handler for DECstations
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*
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* We follow the model in the Indy interrupt code by David Miller, where he
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* says: a lot of complication here is taken away because:
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*
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* 1) We handle one interrupt and return, sitting in a loop
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* and moving across all the pending IRQ bits in the cause
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* register is _NOT_ the answer, the common case is one
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* pending IRQ so optimize in that direction.
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*
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* 2) We need not check against bits in the status register
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* IRQ mask, that would make this routine slow as hell.
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*
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* 3) Linux only thinks in terms of all IRQs on or all IRQs
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* off, nothing in between like BSD spl() brain-damage.
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*
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* Furthermore, the IRQs on the DECstations look basically (barring
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* software IRQs which we don't use at all) like...
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*
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* DS2100/3100's, aka kn01, aka Pmax:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 SCSI
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* 3 Lance Ethernet
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* 4 DZ11 serial
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* 5 RTC
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* 6 Memory Controller & Video
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* 7 FPU
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*
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* DS5000/200, aka kn02, aka 3max:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 TurboChannel
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* 3 RTC
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* 4 Reserved
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* 5 Memory Controller
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* 6 Reserved
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* 7 FPU
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*
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* DS5000/1xx's, aka kn02ba, aka 3min:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 TurboChannel Slot 0
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* 3 TurboChannel Slot 1
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* 4 TurboChannel Slot 2
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* 5 TurboChannel Slot 3 (ASIC)
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* 6 Halt button
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* 7 FPU/R4k timer
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*
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* DS5000/2x's, aka kn02ca, aka maxine:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 Periodic Interrupt (100usec)
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* 3 RTC
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* 4 I/O write timeout
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* 5 TurboChannel (ASIC)
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* 6 Halt Keycode from Access.Bus keyboard (CTRL-ALT-ENTER)
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* 7 FPU/R4k timer
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*
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* DS5000/2xx's, aka kn03, aka 3maxplus:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 System Board (ASIC)
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* 3 RTC
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* 4 Reserved
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* 5 Memory
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* 6 Halt Button
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* 7 FPU/R4k timer
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*
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* We handle the IRQ according to _our_ priority (see setup.c),
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* then we just return. If multiple IRQs are pending then we will
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* just take another exception, big deal.
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*/
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.align 5
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NESTED(plat_irq_dispatch, PT_SIZE, ra)
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.set noreorder
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/*
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* Get pending Interrupts
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*/
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mfc0 t0,CP0_CAUSE # get pending interrupts
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mfc0 t1,CP0_STATUS
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#ifdef CONFIG_32BIT
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lw t2,cpu_fpu_mask
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#endif
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andi t0,ST0_IM # CAUSE.CE may be non-zero!
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and t0,t1 # isolate allowed ones
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beqz t0,spurious
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#ifdef CONFIG_32BIT
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and t2,t0
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bnez t2,fpu # handle FPU immediately
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#endif
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/*
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* Find irq with highest priority
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*/
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PTR_LA t1,cpu_mask_nr_tbl
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1: lw t2,(t1)
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nop
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and t2,t0
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beqz t2,1b
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addu t1,2*PTRSIZE # delay slot
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/*
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* Do the low-level stuff
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*/
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lw a0,(-PTRSIZE)(t1)
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nop
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bgez a0,handle_it # irq_nr >= 0?
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# irq_nr < 0: it is an address
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nop
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jr a0
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# a trick to save a branch:
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lui t2,(KN03_IOASIC_BASE>>16)&0xffff
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# upper part of IOASIC Address
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/*
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* Handle "IRQ Controller" Interrupts
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* Masked Interrupts are still visible and have to be masked "by hand".
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*/
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FEXPORT(kn02_io_int) # 3max
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lui t0,(KN02_CSR_BASE>>16)&0xffff
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# get interrupt status and mask
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lw t0,(t0)
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nop
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andi t1,t0,KN02_IRQ_ALL
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b 1f
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srl t0,16 # shift interrupt mask
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FEXPORT(kn02xa_io_int) # 3min/maxine
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lui t2,(KN02XA_IOASIC_BASE>>16)&0xffff
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# upper part of IOASIC Address
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FEXPORT(kn03_io_int) # 3max+ (t2 loaded earlier)
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lw t0,IO_REG_SIR(t2) # get status: IOASIC sir
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lw t1,IO_REG_SIMR(t2) # get mask: IOASIC simr
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nop
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1: and t0,t1 # mask out allowed ones
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beqz t0,spurious
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/*
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* Find irq with highest priority
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*/
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PTR_LA t1,asic_mask_nr_tbl
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2: lw t2,(t1)
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nop
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and t2,t0
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beq zero,t2,2b
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addu t1,2*PTRSIZE # delay slot
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/*
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* Do the low-level stuff
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*/
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lw a0,%lo(-PTRSIZE)(t1)
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nop
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bgez a0,handle_it # irq_nr >= 0?
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# irq_nr < 0: it is an address
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nop
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jr a0
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nop # delay slot
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/*
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* Dispatch low-priority interrupts. We reconsider all status
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* bits again, which looks like a lose, but it makes the code
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* simple and O(log n), so it gets compensated.
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*/
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FEXPORT(cpu_all_int) # HALT, timers, software junk
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li a0,DEC_CPU_IRQ_BASE
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srl t0,CAUSEB_IP
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li t1,CAUSEF_IP>>CAUSEB_IP # mask
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b 1f
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li t2,4 # nr of bits / 2
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FEXPORT(kn02_all_int) # impossible ?
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li a0,KN02_IRQ_BASE
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li t1,KN02_IRQ_ALL # mask
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b 1f
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li t2,4 # nr of bits / 2
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FEXPORT(asic_all_int) # various I/O ASIC junk
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li a0,IO_IRQ_BASE
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li t1,IO_IRQ_ALL # mask
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b 1f
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li t2,8 # nr of bits / 2
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/*
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* Dispatch DMA interrupts -- O(log n).
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*/
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FEXPORT(asic_dma_int) # I/O ASIC DMA events
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li a0,IO_IRQ_BASE+IO_INR_DMA
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srl t0,IO_INR_DMA
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li t1,IO_IRQ_DMA>>IO_INR_DMA # mask
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li t2,8 # nr of bits / 2
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/*
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* Find irq with highest priority.
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* Highest irq number takes precedence.
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*/
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1: srlv t3,t1,t2
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2: xor t1,t3
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and t3,t0,t1
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beqz t3,3f
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nop
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move t0,t3
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addu a0,t2
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3: srl t2,1
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bnez t2,2b
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srlv t3,t1,t2
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handle_it:
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j dec_irq_dispatch
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nop
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#ifdef CONFIG_32BIT
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fpu:
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j handle_fpe_int
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nop
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#endif
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spurious:
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j spurious_interrupt
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nop
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END(plat_irq_dispatch)
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/*
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* Generic unimplemented interrupt routines -- cpu_mask_nr_tbl
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* and asic_mask_nr_tbl are initialized to point all interrupts here.
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* The tables are then filled in by machine-specific initialisation
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* in dec_setup().
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*/
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FEXPORT(dec_intr_unimplemented)
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move a1,t0 # cheats way of printing an arg!
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PANIC("Unimplemented cpu interrupt! CP0_CAUSE: 0x%08x");
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FEXPORT(asic_intr_unimplemented)
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move a1,t0 # cheats way of printing an arg!
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PANIC("Unimplemented asic interrupt! ASIC ISR: 0x%08x");
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