98 lines
2.8 KiB
ArmAsm
98 lines
2.8 KiB
ArmAsm
/* optimsoc.S -- Support for OpTiMSoC systems.
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*
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* Copyright (c) 2014 Authors
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*
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* Contributor Stefan Wallentowitz <stefan.wallentowitz@saunalahti.fi>
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include "../include/or1k-asm.h"
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#include "../include/or1k-nop.h"
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#define OPTIMSOC_NA_BASE 0xe0000000
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#define OPTIMSOC_NA_REGS OPTIMSOC_NA_BASE + 0x00000
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#define OPTIMSOC_NA_LMEM_SIZE OPTIMSOC_NA_REGS + 0x24
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#define OPTIMSOC_NA_GMEM_SIZE OPTIMSOC_NA_REGS + 0x1c
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#define OPTIMSOC_GZLL_STRING 0x677a6c6c
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#define OPTIMSOC_GZLL_IMAGE_LAYOUT 0x2000
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/*
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* Define symbols to be used during startup - file is linked at compile time
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*
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*/
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.weak _or1k_board_mem_base
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.weak _or1k_board_mem_size
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.weak _or1k_board_clk_freq
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_or1k_board_mem_base: .long 0x0
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_or1k_board_mem_size: .long 0x0
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_or1k_board_clk_freq: .long 50000000
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.weak _or1k_board_uart_base
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.weak _or1k_board_uart_baud
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.weak _or1k_board_uart_IRQ
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_or1k_board_uart_base: .long 0x0
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_or1k_board_uart_baud: .long 0
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_or1k_board_uart_IRQ: .long 0
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.weak _or1k_board_exit
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_or1k_board_exit:
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l.nop OR1K_NOP_K_EXIT
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.Lexitloop:
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OR1K_DELAYED_NOP(l.j .Lexitloop)
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.extern _or1k_heap_start
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.global _or1k_board_init_early
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_or1k_board_init_early:
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#ifndef __OR1K_MULTICORE__
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l.nop 0x1
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.die:
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OR1K_DELAYED_NOP(l.j .die)
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#endif
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l.movhi r1,hi(OPTIMSOC_NA_LMEM_SIZE)
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l.ori r1,r1,lo(OPTIMSOC_NA_LMEM_SIZE)
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l.lwz r1,0(r1)
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l.movhi r2,hi(_or1k_board_mem_size)
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l.ori r2,r2,lo(_or1k_board_mem_size)
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l.sw 0(r2),r1
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// Set stack beyond apps if single image in local memory
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// Is this a kernel running?
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l.movhi r3,hi(OPTIMSOC_GZLL_STRING)
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l.ori r3,r3,lo(OPTIMSOC_GZLL_STRING)
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l.movhi r4,hi(OPTIMSOC_GZLL_IMAGE_LAYOUT)
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l.ori r4,r4,lo(OPTIMSOC_GZLL_IMAGE_LAYOUT)
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l.lwz r5,0(r4)
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l.sfeq r3,r5
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// If not, we are done
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OR1K_DELAYED_NOP(l.bnf ._or1k_board_init_early_done)
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// Else: are we running with global memory (loading)?
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l.movhi r6,hi(OPTIMSOC_NA_GMEM_SIZE)
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l.ori r6,r6,lo(OPTIMSOC_NA_GMEM_SIZE)
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l.lwz r6,0(r6)
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l.sfeqi r6,0
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// If yes, we are done
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OR1K_DELAYED_NOP(l.bnf ._or1k_board_init_early_done)
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// Else: Read end of apps
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l.lwz r7,12(r4)
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l.movhi r8,hi(_or1k_heap_start)
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l.ori r8,r8,lo(_or1k_heap_start)
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l.sw 0(r8),r7
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._or1k_board_init_early_done:
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OR1K_DELAYED_NOP(l.jr r9)
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.weak _or1k_board_init
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_or1k_board_init:
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OR1K_DELAYED_NOP(l.jr r9)
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