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5eb4a1666d
- With the gzll kernel we have two different loading options:
- If the image is loaded to the global memory, the bootstrapping
loads the kernel to local memory. Applications are loaded on
demand. The heap then starts right after bss.
- If the image is pre-loaded to the local memory it includes the
application binaries right after bss. The heap then starts after
the application objects.
- We can check if this is a gzll kernel as it has the string "gzll" at
0x2000. At 0x200c we then find the end of the application objects in
the image. If there is no global memory we set _or1k_heap_start to
this value.
* or1k/boards/optimsoc.S: Heap for gzll kernel
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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