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