fdc08a8446
Very little needed to port except to conditionalize some assembly in the context switch and exception code. Mostly needed to move build system stuff around and add a new project.
56 lines
1.0 KiB
ArmAsm
56 lines
1.0 KiB
ArmAsm
/*
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* Copyright (c) 2015 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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.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 ARCH_RISCV_TWOSEGMENT
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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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