forked from Imagelibrary/rtems
eea21eaca1
The work area initialization was done by the BSP through bsp_work_area_initialize(). This approach predated the system initialization through the system initialization linker set. The workspace and C program heap were unconditionally initialized. The aim is to support RTEMS application configurations which do not need the workspace and C program heap. In these configurations, the workspace and C prgram heap should not get initialized. Change all bsp_work_area_initialize() to implement _Memory_Get() instead. Move the dirty memory, sbrk(), per-CPU data, workspace, and malloc() heap initialization into separate system initialization steps. This makes it also easier to test the individual initialization steps. This change adds a dependency to _Heap_Extend() to all BSPs. This dependency will be removed in a follow up change. Update #3838.
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/* #define BSP_GET_WORK_AREA_DEBUG */
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#include <bsp.h>
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#include <bsp/bootcard.h>
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#include <rtems/sysinit.h>
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#ifdef BSP_GET_WORK_AREA_DEBUG
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#include <rtems/bspIo.h>
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#endif
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/*
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* These are provided by the linkcmds.
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*/
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extern char WorkAreaBase[];
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extern char HeapSize[];
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extern char RamSize[];
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/* rudimentary multiboot info */
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struct multiboot_info {
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uint32_t flags; /* start.S only raises flags for items actually */
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/* saved; this allows us to check for the size */
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/* of the data structure. */
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uint32_t mem_lower; /* avail kB in lower memory */
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uint32_t mem_upper; /* avail kB in lower memory */
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/* ... (unimplemented) */
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};
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extern struct multiboot_info _boot_multiboot_info;
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/*
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* This is the first address of the memory we can use for the RTEMS
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* Work Area.
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*/
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static uintptr_t rtemsWorkAreaStart;
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/*
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* Board's memory size easily be overridden by application.
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*/
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uint32_t bsp_mem_size = 0;
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static void bsp_size_memory(void)
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{
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uintptr_t topAddr;
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/* Set the value of start of free memory. */
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rtemsWorkAreaStart = (uint32_t)WorkAreaBase;
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/* Align the RTEMS Work Area at beginning of free memory. */
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if (rtemsWorkAreaStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */
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rtemsWorkAreaStart = (rtemsWorkAreaStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
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/* The memory detection algorithm is very crude; try
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* to use multiboot info, if possible (set from start.S)
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*/
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if ( ((uintptr_t)RamSize == (uintptr_t) 0xFFFFFFFF) &&
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(_boot_multiboot_info.flags & 1) &&
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_boot_multiboot_info.mem_upper ) {
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topAddr = _boot_multiboot_info.mem_upper * 1024;
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#ifdef BSP_GET_WORK_AREA_DEBUG
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printk( "Multiboot info says we have 0x%08x\n", topAddr );
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#endif
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} else if ( (uintptr_t) RamSize == (uintptr_t) 0xFFFFFFFF ) {
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uintptr_t lowest;
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uint32_t val;
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int i;
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/*
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* We have to dynamically size memory. Memory size can be anything
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* between no less than 2M and 2048M. If we can write a value to
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* an address and read the same value back, then the memory is there.
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*
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* WARNING: This can detect memory which should be reserved for
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* graphics controllers which share the CPU's RAM.
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*/
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/* find the lowest 1M boundary to probe */
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lowest = ((rtemsWorkAreaStart + (1<<20)) >> 20) + 1;
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if ( lowest < 2 )
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lowest = 2;
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for (i=2048; i>=lowest; i--) {
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topAddr = i*1024*1024 - 4;
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*(volatile uint32_t*)topAddr = topAddr;
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}
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for(i=lowest; i<=2048; i++) {
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topAddr = i*1024*1024 - 4;
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val = *(volatile uint32_t*)topAddr;
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if (val != topAddr) {
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break;
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}
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}
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topAddr = (i-1)*1024*1024;
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#ifdef BSP_GET_WORK_AREA_DEBUG
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printk( "Dynamically sized to 0x%08x\n", topAddr );
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#endif
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} else {
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topAddr = (uintptr_t) RamSize;
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#ifdef BSP_GET_WORK_AREA_DEBUG
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printk( "hardcoded to 0x%08x\n", topAddr );
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#endif
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}
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bsp_mem_size = topAddr;
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}
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static Memory_Area _Memory_Areas[ 1 ];
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static void bsp_memory_initialize( void )
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{
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/*
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* We need to determine how much memory there is in the system.
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*/
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bsp_size_memory();
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_Memory_Initialize_by_size(
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&_Memory_Areas[0],
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(void *) rtemsWorkAreaStart,
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(uintptr_t) bsp_mem_size - (uintptr_t) rtemsWorkAreaStart
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);
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}
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RTEMS_SYSINIT_ITEM(
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bsp_memory_initialize,
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RTEMS_SYSINIT_MEMORY,
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RTEMS_SYSINIT_ORDER_MIDDLE
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);
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static const Memory_Information _Memory_Information =
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MEMORY_INFORMATION_INITIALIZER( _Memory_Areas );
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const Memory_Information *_Memory_Get( void )
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{
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return &_Memory_Information;
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}
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