diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/pc386/startup/bspstart.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/startup/bspstart.c | 141 |
1 files changed, 9 insertions, 132 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/startup/bspstart.c b/c/src/lib/libbsp/i386/pc386/startup/bspstart.c index 8303858bde..3d87a1cf7d 100644 --- a/c/src/lib/libbsp/i386/pc386/startup/bspstart.c +++ b/c/src/lib/libbsp/i386/pc386/startup/bspstart.c @@ -19,7 +19,7 @@ | bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP | With the following copyright notice: | ************************************************************************** -| * COPYRIGHT (c) 1989-1999. +| * COPYRIGHT (c) 1989-2008. | * On-Line Applications Research Corporation (OAR). | * | * The license and distribution terms for this file may be @@ -34,120 +34,12 @@ #include <rtems/pci.h> #include <libcpu/cpuModel.h> -/*-------------------------------------------------------------------------+ -| Global Variables -+--------------------------------------------------------------------------*/ -extern uint32_t _end; /* End of BSS. Defined in 'linkcmds'. */ - -/* rudimentary multiboot info */ -struct multiboot_info { - uint32_t flags; /* start.S only raises flags for items actually saved; this allows us to check for the size of the data structure */ - uint32_t mem_lower; /* avail kB in lower memory */ - uint32_t mem_upper; /* avail kB in lower memory */ - /* ... (unimplemented) */ -}; - -extern struct multiboot_info _boot_multiboot_info; /* - * Size of heap if it is 0 it will be dynamically defined by memory size, - * otherwise the value should be changed by binary patch - */ -uint32_t _heap_size = 0; - -/* Alternative way to hardcode the board's memory size [rather than heap size]. - * Can easily be overridden by application. + * External routines */ -extern uint32_t bsp_mem_size - __attribute__ ((weak, alias("bsp_mem_size_default"))); -uint32_t bsp_mem_size_default = 0; - -/* Size of stack used during initialization. Defined in 'start.s'. */ -extern uint32_t _stack_size; - -uint32_t rtemsFreeMemStart; - /* Address of start of free memory - should be updated - after creating new partitions or regions. */ - - -/*-------------------------------------------------------------------------+ -| External Prototypes -+--------------------------------------------------------------------------*/ +extern void Calibrate_loop_1ms(void); extern void rtems_irq_mngt_init(void); -void bsp_libc_init( void *, uint32_t, int ); - -/*-------------------------------------------------------------------------+ -| Function: bsp_pretasking_hook -| Description: BSP pretasking hook. Called just before drivers are -| initialized. Used to setup libc and install any BSP -| extensions. NOTE: Must not use libc (to do io) from here, -| since drivers are not yet initialized. -| Global Variables: None. -| Arguments: None. -| Returns: Nothing. -+--------------------------------------------------------------------------*/ -void bsp_pretasking_hook(void) -{ - uint32_t topAddr, val; - int i, lowest; - - if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */ - rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); - - /* find the lowest 1M boundary to probe */ - lowest = ((rtemsFreeMemStart + (1<<20)) >> 20) + 1; - if ( lowest < 2 ) - lowest = 2; - - /* The memory detection algorithm is very crude; try - * to use multiboot info, if possible (set from start.S) - */ - if ( bsp_mem_size == 0 && - (_boot_multiboot_info.flags & 1) && - _boot_multiboot_info.mem_upper ) { - bsp_mem_size = _boot_multiboot_info.mem_upper * 1024; - } - - if ( _heap_size == 0 ) { - if ( bsp_mem_size == 0 ) { - /* - * We have to dynamically size memory. Memory size can be anything - * between no less than 2M and 2048M. - * let us first write - */ - for (i=2048; i>=lowest; i--) { - topAddr = i*1024*1024 - 4; - *(volatile uint32_t*)topAddr = topAddr; - } - - for(i=lowest; i<=2048; i++) { - topAddr = i*1024*1024 - 4; - val = *(uint32_t*)topAddr; - if (val != topAddr) { - break; - } - } - - topAddr = (i-1)*1024*1024 - 4; - } else { - topAddr = bsp_mem_size; - } - - if ( rtemsFreeMemStart > topAddr ) { - printk( "Out of memory -- unable to initialize BSP\n" ); - rtems_fatal_error_occurred( 0x85858585 ); - } - - _heap_size = topAddr - rtemsFreeMemStart; - } - - bsp_libc_init((void *)rtemsFreeMemStart, _heap_size, 0); - rtemsFreeMemStart += _heap_size; /* HEAP_SIZE in KBytes */ -} /* bsp_pretasking_hook */ - -/* - * External but essentially private method - */ -void Calibrate_loop_1ms(void); +extern void bsp_size_memory(void); /*-------------------------------------------------------------------------+ | Function: bsp_start @@ -161,21 +53,15 @@ void bsp_start_default( void ) int pci_init_retval; /* + * We need to determine how much memory there is in the system. + */ + bsp_size_memory(); + + /* * Calibrate variable for 1ms-loop (see timer.c) */ Calibrate_loop_1ms(); - /* set the value of start of free memory. */ - rtemsFreeMemStart = (uint32_t)&_end + _stack_size; - - /* Place RTEMS workspace at beginning of free memory. */ - - if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */ - rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); - - Configuration.work_space_start = (void *)rtemsFreeMemStart; - rtemsFreeMemStart += rtems_configuration_get_work_space_size(); - /* * Init rtems interrupt management */ @@ -192,15 +78,6 @@ void bsp_start_default( void ) if (pci_init_retval != PCIB_ERR_SUCCESS) { printk("PCI bus: could not initialize PCI BIOS interface\n"); } - - -#if 0 - printk( "_heap_size = 0x%x\n", _heap_size ); - printk( "_stack_size = 0x%x\n", _stack_size ); - printk( "rtemsFreeMemStart = 0x%x\n", rtemsFreeMemStart ); - printk( "work_space_start = 0x%x\n", rtems_configuration_get_work_space_start() ); - printk( "work_space_size = 0x%x\n", rtems_configuration_get_work_space_size() ); -#endif } /* bsp_start */ /* |