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.
136 lines
3.4 KiB
ArmAsm
136 lines
3.4 KiB
ArmAsm
/*
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* This is based on the mvme-crt0.S file from libgloss/rs6000.
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* crt0.S -- startup file for PowerPC systems.
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*
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* Copyright (c) 1995 Cygnus Support
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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 <rtems/asm.h>
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#include <rtems/score/cpu.h>
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#include <libcpu/io.h>
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#include "ppc-asm.h"
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.section ".got2","aw"
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.align 2
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.LCTOC1 = .+32768
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.extern FUNC_NAME(atexit)
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.globl FUNC_NAME(__atexit)
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.section ".sdata","aw"
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.align 2
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FUNC_NAME(__atexit): /* tell C's eabi-ctor's we have an atexit function */
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.long FUNC_NAME(atexit)@fixup /* and that it is to register __do_global_dtors */
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.section ".fixup","aw"
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.align 2
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.long FUNC_NAME(__atexit)
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.section ".got2","aw"
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.Ltable = .-.LCTOC1
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.long .LCTOC1 /* address we think .LCTOC1 is loaded at */
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.Lbss_start = .-.LCTOC1
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.long bsp_section_sbss_begin
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.Lend = .-.LCTOC1
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.long bsp_section_bss_end
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.Lstack = .-.LCTOC1 /* stack address if set by user */
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.long _Configuration_Interrupt_stack_area_end
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.text
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.Lptr:
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.long .LCTOC1-.Laddr
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.globl __rtems_entry_point
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.type __rtems_entry_point,@function
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__rtems_entry_point:
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#if 1
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.globl _start
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.type _start,@function
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_start:
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#endif
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bl .Laddr /* get current address */
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.Laddr:
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mflr r4 /* real address of .Laddr */
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lwz r5,(.Lptr-.Laddr)(r4) /* linker generated address of .LCTOC1 */
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add r5,r5,r4 /* correct to real pointer */
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lwz r4,.Ltable(r5) /* get linker's idea of where .Laddr is */
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subf r4,r4,r5 /* calculate difference between where linked and current */
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/* clear bss */
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lwz r6,.Lbss_start(r5) /* calculate beginning of the BSS */
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lwz r7,.Lend(r5) /* calculate end of the BSS */
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add r6,r6,r4 /* adjust pointers */
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add r7,r7,r4
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cmplw 1,r6,r7
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bc 4,4,.Ldone
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subf r8,r6,r7 /* number of bytes to zero */
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srwi r9,r8,2 /* number of words to zero */
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mtctr r9
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li r0,0 /* zero to clear memory */
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addi r6,r6,-4 /* adjust so we can use stwu */
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.Lloop:
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stwu r0,4(r6) /* zero bss */
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bdnz .Lloop
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.Ldone:
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lwz r0,.Lstack(r5) /* stack area or 0 */
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cmplwi 1,r0,0 /* equal to 0? */
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bc 12,6,.Lnostack /* use default stack if == 0 */
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mr sp,r0 /* use user defined stack */
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.Lnostack:
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#ifdef __ALTIVEC__
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/* enable altivec; this requires the ALTIVEC user
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* extension to be installed in the user extension
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* slot 0!
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*/
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mfmsr r0
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oris r0, r0, (1<<(31-16-6))
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mtmsr r0
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isync
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/*
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* set vscr and vrsave to known values
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*/
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li r0, 0
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mtvrsave r0
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vxor 0,0,0
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mtvscr 0
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#endif
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/* set up initial stack frame */
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addi sp,sp,-4 /* make sure we don't overwrite debug mem */
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/* align */
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li r3, CPU_STACK_ALIGNMENT-1
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andc sp, sp, r3
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lis r0,0
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stw r0,0(sp) /* clear back chain */
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stwu sp,-CPU_STACK_ALIGNMENT(sp) /* push another stack frame */
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bl FUNC_NAME(__eabi)
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/* Let her rip */
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li r3, 0 /* command line */
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bl FUNC_NAME(boot_card)
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.globl FUNC_NAME(bsp_reset)
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FUNC_NAME(bsp_reset):
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li 10,99 /* 0x63 */
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sc
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.Lstart:
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.size _start,.Lstart-_start
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