forked from Imagelibrary/rtems
511dc4b2be
Statically initialize the interrupt stack area
(_Configuration_Interrupt_stack_area_begin,
_Configuration_Interrupt_stack_area_end, and
_Configuration_Interrupt_stack_size) via <rtems/confdefs.h>. Place the
interrupt stack area in a special section ".rtemsstack.interrupt". Let
BSPs define the optimal placement of this section in their linker
command files (e.g. in a fast on-chip memory).
This change makes makes the CPU_HAS_SOFTWARE_INTERRUPT_STACK and
CPU_HAS_HARDWARE_INTERRUPT_STACK CPU port defines superfluous, since the
low level initialization code has all information available via global
symbols.
This change makes the CPU_ALLOCATE_INTERRUPT_STACK CPU port define
superfluous, since the interrupt stacks are allocated by confdefs.h for
all architectures. There is no need for BSP-specific linker command
file magic (except the section placement), see previous ARM linker
command file as a bad example.
Remove _CPU_Install_interrupt_stack(). Initialize the hardware
interrupt stack in _CPU_Initialize() if necessary (e.g.
m68k_install_interrupt_stack()).
The optional _CPU_Interrupt_stack_setup() is still useful to customize
the registration of the interrupt stack area in the per-CPU information.
The initialization stack can reuse the interrupt stack, since
* interrupts are disabled during the sequential system initialization,
and
* the boot_card() function does not return.
This stack resuse saves memory.
Changes per architecture:
arm:
* Mostly replace the linker symbol based configuration of stacks with
the standard <rtems/confdefs.h> configuration via
CONFIGURE_INTERRUPT_STACK_SIZE. The size of the FIQ, ABT and UND
mode stack is still defined via linker symbols. These modes are
rarely used in applications and the default values provided by the
BSP should be sufficient in most cases.
* Remove the bsp_processor_count linker symbol hack used for the SMP
support. This is possible since the interrupt stack area is now
allocated by the linker and not allocated from the heap. This makes
some configure.ac stuff obsolete. Remove the now superfluous BSP
variants altcycv_devkit_smp and realview_pbx_a9_qemu_smp.
bfin:
* Remove unused magic linker command file allocation of initialization
stack. Maybe a previous linker command file copy and paste problem?
In the start.S the initialization stack is set to a hard coded value.
lm32, m32c, mips, nios2, riscv, sh, v850:
* Remove magic linker command file allocation of initialization stack.
Reuse interrupt stack for initialization stack.
m68k:
* Remove magic linker command file allocation of initialization stack.
Reuse interrupt stack for initialization stack.
powerpc:
* Remove magic linker command file allocation of initialization stack.
Reuse interrupt stack for initialization stack.
* Used dedicated memory region (REGION_RTEMSSTACK) for the interrupt
stack on BSPs using the shared linkcmds.base (replacement for
REGION_RWEXTRA).
sparc:
* Remove the hard coded initialization stack. Use the interrupt stack
for the initialization stack on the boot processor. This saves
16KiB of RAM.
Update #3459.
141 lines
3.9 KiB
ArmAsm
141 lines
3.9 KiB
ArmAsm
/* entry.s
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*
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* This file contains the entry point for the application.
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* The name of this entry point is compiler dependent.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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* COPYRIGHT (c) 1989-1999.
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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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#include <rtems/asm.h>
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#if (M68K_COLDFIRE_ARCH == 0) /* All ColdFire BSPs must provide their own start vector */
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BEGIN_CODE
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| Default entry points for:
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PUBLIC (start) | GNU
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PUBLIC (M68Kvec) | Vector Table
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SYM (start):
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SYM (M68Kvec): | standard location for vectors
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nop | for linkers with problem
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| location zero
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jmp SYM (start_around)
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/*
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* We can use the following space as our vector table
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* if the CPU has a VBR or we can save vector table in it
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* if the CPU does not.
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*/
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.space 4088 | to avoid initial intr stack
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| from 135BUG on MVME13?
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| and start code at 0x4000
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SYM (vectors):
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.space 1016 | reserve space for rest of vectors
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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SYM (lowintstack):
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.space 4092 | reserve for interrupt stack
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SYM (hiintstack):
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.space 4 | end of interrupt stack
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#endif
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PUBLIC (start_around)
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SYM (start_around):
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move.w sr, SYM (initial_sr)
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oriw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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movec isp,a0
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move.l a0, SYM (initial_isp)
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movec usp,a0
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move.l a0, SYM (initial_usp)
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movec msp,a0
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move.l a0, SYM (initial_msp)
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#else
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move.l a7, SYM (initial_msp)
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#endif
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| zero out uninitialized data area
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zerobss:
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moveal # SYM (bsp_section_bss_end),a0 | find end of .bss
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moveal # SYM (bsp_section_bss_begin),a1 | find beginning of .bss
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movel #0,d0
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loop: movel #0,a1@+ | to zero out uninitialized
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cmpal a0,a1
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jlt loop | loop until _end reached
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movel # SYM (_Configuration_Interrupt_stack_area_end),d0 | d0 = stop of stack
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movw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
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movel d0,a7 | set master stack pointer
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movel d0,a6 | set base pointer
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/*
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* RTEMS should maintain a separate interrupt stack on CPUs
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* without one in hardware. This is currently not supported
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* on versions of the m68k without a HW intr stack.
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*/
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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lea SYM (hiintstack),a0 | a0 = high end of intr stack
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movec a0,isp | set interrupt stack
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#endif
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movel #0,a7@- | push command line
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jsr SYM (boot_card)
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addl #12,a7
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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move.l SYM (initial_isp),a0
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movec a0,isp
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move.l SYM (initial_usp),a0
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movec a0,usp
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move.l SYM (initial_msp),a0
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movec a0,msp
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#else
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movea.l SYM (initial_msp),a7
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#endif
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move.w SYM (initial_sr),sr
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rts
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END_CODE
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BEGIN_DATA
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PUBLIC (start_frame)
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SYM (start_frame):
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.space 4,0
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END_DATA
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BEGIN_BSS
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PUBLIC (initial_isp)
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SYM (initial_isp):
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.space 4
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PUBLIC (initial_msp)
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SYM (initial_msp):
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.space 4
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PUBLIC (initial_usp)
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SYM (initial_usp):
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.space 4
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PUBLIC (initial_sr)
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SYM (initial_sr):
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.space 2
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END_DATA
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#endif
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END
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