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or1k: set heap start for optimsoc-gzll

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- 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
This commit is contained in:
Jeff Johnston 2015-05-26 15:30:30 -04:00 committed by Corinna Vinschen
parent 58efeedd16
commit 5eb4a1666d
2 changed files with 33 additions and 0 deletions
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4
libgloss/ChangeLog
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@ -1,3 +1,7 @@
2015-05-26 Stefan Wallentowitz <stefan.wallentowitz@tum.de>
* or1k/boards/optimsoc.S: Heap for gzll kernel
2015-05-26 Stefan Wallentowitz <stefan.wallentowitz@tum.de>
* or1k/sbrk.c: Allow for different heap start

29
libgloss/or1k/boards/optimsoc.S
View File

@ -22,7 +22,10 @@
#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
*
@ -49,6 +52,8 @@ _or1k_board_exit:
.Lexitloop:
OR1K_DELAYED_NOP(l.j .Lexitloop)
.extern _or1k_heap_start
.global _or1k_board_init_early
_or1k_board_init_early:
#ifndef __OR1K_MULTICORE__
@ -62,6 +67,30 @@ _or1k_board_init_early:
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: