a0a6b10e0b
The initial port is really a Sifive E platform. Call it what it is and make space for bringing up the Sifive U and virt qemu target.
91 lines
2.3 KiB
ArmAsm
91 lines
2.3 KiB
ArmAsm
/*
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* Copyright (c) 2015 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <asm.h>
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#if 0
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.section ".vectors", "ax"
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.globl _vectab
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_vectab:
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/* vector table here */
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# start vector
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brai start
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# user exception
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brai unhandled_exception
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# interrupt
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brai microblaze_irq
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# break
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brai unhandled_exception
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# hardware exception
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brai unhandled_exception
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# reserved for future
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.fill (0x50 - 0x28)
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#endif
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.section ".text.boot"
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FUNCTION(_start)
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.option push
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.option norelax
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# set the global pointer
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la gp, __global_pointer$
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.option pop
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# set the default stack
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la sp, default_stack_top
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#if 1
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# copy preinitialized data from flash to memory
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la t0, __data_start_rom
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la t1, __data_start
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la t2, __data_end
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beq t0, t1, 1f
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0:
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lw t3, (t0)
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sw t3, (t1)
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add t0, t0, 4
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add t1, t1, 4
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bne t1, t2, 0b
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#endif
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# zero bss
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1:
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la t0, __bss_start
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la t1, __bss_end
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0:
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sw x0, (t0)
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add t0, t0, 4
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bne t0, t1, 0b
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# call main
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jal lk_main
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# should never return here
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j .
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.bss
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.align 4
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LOCAL_DATA(default_stack)
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.skip 1024
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LOCAL_DATA(default_stack_top)
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