49644a2c39
Port to the really neat 68010 based board at https://rosco-m68k.com/ Port Features: -10Mhz 68010 -1MB ram -Dual UART + timer implemented as a 68c681 chip -timer running at 1Khz, UART A for console -interrupt driven RX support Some amount of extending of the 68k exceptinon code was needed to support the autovectored irqs that the 68681 uart uses. Added build system support for 68010.
89 lines
1.9 KiB
ArmAsm
89 lines
1.9 KiB
ArmAsm
/*
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* Copyright (c) 2021 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/asm.h>
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.text
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#if M68K_CPU >= 68010
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// For 68010s and above the exception frame already has a code pushed on the stack,
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// so it's easy to just vector most of the handlers into one of a few classes of handlers
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// and decode the vector in C.
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.align 4
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_m68k_irq_vector:
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// TODO: save less state for IRQs
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moveml %d0-%d7/%a0-%a6, %sp@-
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movel %sp,%sp@-
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jsr m68k_irq
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add #4, %sp
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moveml %sp@+, %d0-%d7/%a0-%a6
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rte
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.macro exception_vector name func
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.align 4
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\name:
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moveml %d0-%d7/%a0-%a6, %sp@-
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movel %sp,%sp@-
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jsr \func
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add #4, %sp
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moveml %sp@+, %d0-%d7/%a0-%a6
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rte
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.endm
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exception_vector _m68k_general_exception m68k_exception
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exception_vector _m68k_trap_exception m68k_trap_exception
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.section .text.vectab
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.align 16
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DATA(exc_vectors)
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// first two entries are the reset vector
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.long 0
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.long 0
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// general exceptions
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.rept (15 - 2)
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.long _m68k_general_exception
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.endr
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.org (15*4)
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// uninitialized irq vector
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.long _m68k_irq_vector
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.org (16*4)
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.rept (24 - 16)
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.long _m68k_general_exception
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.endr
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.org (24 * 4) // offset 0x60
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// start of autovectored interrupts
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.rept (32 - 24)
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.long _m68k_irq_vector
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.endr
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.org (32 * 4) // offset 0x60
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// index 32, offset 0x80
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.rept (48 - 32)
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.long _m68k_trap_exception
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.endr
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.org (48 * 4)
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// start of FPU, MMU vectors
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.rept (64 - 48)
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.long _m68k_general_exception
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.endr
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.org (64 * 4) // offset 0x100
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// index 64, offset 0x100, end of reserved vectors
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// start of user vectors
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.rept (256 - 64)
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.long _m68k_irq_vector
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.endr
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.org 4*256
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END_DATA(exc_vectors)
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#else
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#error add support for pre 68010 exceptions
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#endif
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