RTOS/rtems
1
0
Fork 0
forked from Imagelibrary/rtems
Code Pull Requests Activity
Files
511dc4b2bee78ce0714e83838644429a29d325b1
rtems/bsps/m68k/genmcf548x/start/start.S
Sebastian Huber 511dc4b2be Rework initialization and interrupt stack support 
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.
2018-06-27 08:58:16 +02:00

433 lines
18 KiB
ArmAsm
Raw Blame History

/*===============================================================*\
| Project: RTEMS generic mcf548x BSP |
+-----------------------------------------------------------------+
| File: start.S |
+-----------------------------------------------------------------+
| The file contains the assembly part of MCF548x init code |
+-----------------------------------------------------------------+
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| |
| Parts of the code has been derived from the "dBUG source code" |
| package Freescale is providing for M548X EVBs. The usage of |
| the modified or unmodified code and it's integration into the |
| generic mcf548x BSP has been done according to the Freescale |
| license terms. |
| |
| The Freescale license terms can be reviewed in the file |
| |
| Freescale_license.txt |
| |
+-----------------------------------------------------------------+
| |
| The generic mcf548x BSP has been developed on the basic |
| structures and modules of the av5282 BSP. |
| |
+-----------------------------------------------------------------+
| |
| The license and distribution terms for this file may be |
| found in the file LICENSE in this distribution or at |
| |
| http://www.rtems.org/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| |
| date history ID |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 12.11.07 1.0 ras |
| |
\*===============================================================*/
/*===============================================================*\
| Includes |
\*===============================================================*/
#include <rtems/asm.h>
#include <bsp/linker-symbols.h>
/*===============================================================*\
| External references |
\*===============================================================*/
.extern __MBAR
.extern _CoreSramBase0
.extern _CoreSramBase1
.extern _CoreSramSize1
.extern mcf548x_init
.extern boot_card
/*===============================================================*\
| Global symbols |
\*===============================================================*/
.global interrupt_vector_table
.global spurious_int_count
.global start
/*===============================================================*\
| Exception Table |
\*===============================================================*/
.section ".vectors","ax" /* begin of vectors section */
PUBLIC (InterruptVectorTable)
SYM(InterruptVectorTable):
INITSP: .long _Configuration_Interrupt_stack_area_end /* Initial SP */
INITPC: .long start /* Initial PC */
vector002: .long asm_default_interrupt /* Access Error */
vector003: .long asm_default_interrupt /* Address Error */
vector004: .long asm_default_interrupt /* Illegal Instruction */
vector005: .long asm_default_interrupt /* Reserved */
vector006: .long asm_default_interrupt /* Reserved */
vector007: .long asm_default_interrupt /* Reserved */
vector008: .long asm_default_interrupt /* Privilege Violation */
vector009: .long asm_default_interrupt /* Trace */
vector010: .long asm_default_interrupt /* Unimplemented A-Line */
vector011: .long asm_default_interrupt /* Unimplemented F-Line */
vector012: .long asm_default_interrupt /* Debug Interrupt */
vector013: .long asm_default_interrupt /* Reserved */
vector014: .long asm_default_interrupt /* Format Error */
vector015: .long asm_default_interrupt /* Unitialized Int. */
vector016: .long asm_default_interrupt /* Reserved */
vector017: .long asm_default_interrupt /* Reserved */
vector018: .long asm_default_interrupt /* Reserved */
vector019: .long asm_default_interrupt /* Reserved */
vector020: .long asm_default_interrupt /* Reserved */
vector021: .long asm_default_interrupt /* Reserved */
vector022: .long asm_default_interrupt /* Reserved */
vector023: .long asm_default_interrupt /* Reserved */
vector024: .long asm_spurious_interrupt /* Spurious Interrupt */
vector025: .long asm_default_interrupt /* Autovector Level 1 */
vector026: .long asm_default_interrupt /* Autovector Level 2 */
vector027: .long asm_default_interrupt /* Autovector Level 3 */
vector028: .long asm_default_interrupt /* Autovector Level 4 */
vector029: .long asm_default_interrupt /* Autovector Level 5 */
vector030: .long asm_default_interrupt /* Autovector Level 6 */
vector031: .long asm_default_interrupt /* Autovector Level 7 */
vector032: .long asm_default_interrupt /* TRAP #0 */
vector033: .long asm_default_interrupt /* TRAP #1 */
vector034: .long asm_default_interrupt /* TRAP #2 */
vector035: .long asm_default_interrupt /* TRAP #3 */
vector036: .long asm_default_interrupt /* TRAP #4 */
vector037: .long asm_default_interrupt /* TRAP #5 */
vector038: .long asm_default_interrupt /* TRAP #6 */
vector039: .long asm_default_interrupt /* TRAP #7 */
vector040: .long asm_default_interrupt /* TRAP #8 */
vector041: .long asm_default_interrupt /* TRAP #9 */
vector042: .long asm_default_interrupt /* TRAP #10 */
vector043: .long asm_default_interrupt /* TRAP #11 */
vector044: .long asm_default_interrupt /* TRAP #12 */
vector045: .long asm_default_interrupt /* TRAP #13 */
vector046: .long asm_default_interrupt /* TRAP #14 */
vector047: .long asm_default_interrupt /* TRAP #15 */
vector048: .long asm_default_interrupt /* Reserved */
vector049: .long asm_default_interrupt /* Reserved */
vector050: .long asm_default_interrupt /* Reserved */
vector051: .long asm_default_interrupt /* Reserved */
vector052: .long asm_default_interrupt /* Reserved */
vector053: .long asm_default_interrupt /* Reserved */
vector054: .long asm_default_interrupt /* Reserved */
vector055: .long asm_default_interrupt /* Reserved */
vector056: .long asm_default_interrupt /* Reserved */
vector057: .long asm_default_interrupt /* Reserved */
vector058: .long asm_default_interrupt /* Reserved */
vector059: .long asm_default_interrupt /* Reserved */
vector060: .long asm_default_interrupt /* Reserved */
vector061: .long asm_default_interrupt /* Reserved */
vector062: .long asm_default_interrupt /* Reserved */
vector063: .long asm_default_interrupt /* Reserved */
vector064: .long asm_default_interrupt
vector065: .long asm_default_interrupt
vector066: .long asm_default_interrupt
vector067: .long asm_default_interrupt
vector068: .long asm_default_interrupt
vector069: .long asm_default_interrupt
vector070: .long asm_default_interrupt
vector071: .long asm_default_interrupt
vector072: .long asm_default_interrupt
vector073: .long asm_default_interrupt
vector074: .long asm_default_interrupt
vector075: .long asm_default_interrupt
vector076: .long asm_default_interrupt
vector077: .long asm_default_interrupt
vector078: .long asm_default_interrupt
vector079: .long asm_default_interrupt
vector080: .long asm_default_interrupt
vector081: .long asm_default_interrupt
vector082: .long asm_default_interrupt
vector083: .long asm_default_interrupt
vector084: .long asm_default_interrupt
vector085: .long asm_default_interrupt
vector086: .long asm_default_interrupt
vector087: .long asm_default_interrupt
vector088: .long asm_default_interrupt
vector089: .long asm_default_interrupt
vector090: .long asm_default_interrupt
vector091: .long asm_default_interrupt
vector092: .long asm_default_interrupt
vector093: .long asm_default_interrupt
vector094: .long asm_default_interrupt
vector095: .long asm_default_interrupt
vector096: .long asm_default_interrupt
vector097: .long asm_default_interrupt
vector098: .long asm_default_interrupt
vector099: .long asm_default_interrupt
vector100: .long asm_default_interrupt
vector101: .long asm_default_interrupt
vector102: .long asm_default_interrupt
vector103: .long asm_default_interrupt
vector104: .long asm_default_interrupt
vector105: .long asm_default_interrupt
vector106: .long asm_default_interrupt
vector107: .long asm_default_interrupt
vector108: .long asm_default_interrupt
vector109: .long asm_default_interrupt
vector110: .long asm_default_interrupt
vector111: .long asm_default_interrupt
vector112: .long asm_default_interrupt
vector113: .long asm_default_interrupt
vector114: .long asm_default_interrupt
vector115: .long asm_default_interrupt
vector116: .long asm_default_interrupt
vector117: .long asm_default_interrupt
vector118: .long asm_default_interrupt
vector119: .long asm_default_interrupt
vector120: .long asm_default_interrupt
vector121: .long asm_default_interrupt
vector122: .long asm_default_interrupt
vector123: .long asm_default_interrupt
vector124: .long asm_default_interrupt
vector125: .long asm_default_interrupt
vector126: .long asm_default_interrupt
vector127: .long asm_default_interrupt
vector128: .long asm_default_interrupt
vector129: .long asm_default_interrupt
vector130: .long asm_default_interrupt
vector131: .long asm_default_interrupt
vector132: .long asm_default_interrupt
vector133: .long asm_default_interrupt
vector134: .long asm_default_interrupt
vector135: .long asm_default_interrupt
vector136: .long asm_default_interrupt
vector137: .long asm_default_interrupt
vector138: .long asm_default_interrupt
vector139: .long asm_default_interrupt
vector140: .long asm_default_interrupt
vector141: .long asm_default_interrupt
vector142: .long asm_default_interrupt
vector143: .long asm_default_interrupt
vector144: .long asm_default_interrupt
vector145: .long asm_default_interrupt
vector146: .long asm_default_interrupt
vector147: .long asm_default_interrupt
vector148: .long asm_default_interrupt
vector149: .long asm_default_interrupt
vector150: .long asm_default_interrupt
vector151: .long asm_default_interrupt
vector152: .long asm_default_interrupt
vector153: .long asm_default_interrupt
vector154: .long asm_default_interrupt
vector155: .long asm_default_interrupt
vector156: .long asm_default_interrupt
vector157: .long asm_default_interrupt
vector158: .long asm_default_interrupt
vector159: .long asm_default_interrupt
vector160: .long asm_default_interrupt
vector161: .long asm_default_interrupt
vector162: .long asm_default_interrupt
vector163: .long asm_default_interrupt
vector164: .long asm_default_interrupt
vector165: .long asm_default_interrupt
vector166: .long asm_default_interrupt
vector167: .long asm_default_interrupt
vector168: .long asm_default_interrupt
vector169: .long asm_default_interrupt
vector170: .long asm_default_interrupt
vector171: .long asm_default_interrupt
vector172: .long asm_default_interrupt
vector173: .long asm_default_interrupt
vector174: .long asm_default_interrupt
vector175: .long asm_default_interrupt
vector176: .long asm_default_interrupt
vector177: .long asm_default_interrupt
vector178: .long asm_default_interrupt
vector179: .long asm_default_interrupt
vector180: .long asm_default_interrupt
vector181: .long asm_default_interrupt
vector182: .long asm_default_interrupt
vector183: .long asm_default_interrupt
vector184: .long asm_default_interrupt
vector185: .long asm_default_interrupt
vector186: .long asm_default_interrupt
vector187: .long asm_default_interrupt
vector188: .long asm_default_interrupt
vector189: .long asm_default_interrupt
vector190: .long asm_default_interrupt
vector191: .long asm_default_interrupt
vector192: .long asm_default_interrupt
vector193: .long asm_default_interrupt
vector194: .long asm_default_interrupt
vector195: .long asm_default_interrupt
vector196: .long asm_default_interrupt
vector197: .long asm_default_interrupt
vector198: .long asm_default_interrupt
vector199: .long asm_default_interrupt
vector200: .long asm_default_interrupt
vector201: .long asm_default_interrupt
vector202: .long asm_default_interrupt
vector203: .long asm_default_interrupt
vector204: .long asm_default_interrupt
vector205: .long asm_default_interrupt
vector206: .long asm_default_interrupt
vector207: .long asm_default_interrupt
vector208: .long asm_default_interrupt
vector209: .long asm_default_interrupt
vector210: .long asm_default_interrupt
vector211: .long asm_default_interrupt
vector212: .long asm_default_interrupt
vector213: .long asm_default_interrupt
vector214: .long asm_default_interrupt
vector215: .long asm_default_interrupt
vector216: .long asm_default_interrupt
vector217: .long asm_default_interrupt
vector218: .long asm_default_interrupt
vector219: .long asm_default_interrupt
vector220: .long asm_default_interrupt
vector221: .long asm_default_interrupt
vector222: .long asm_default_interrupt
vector223: .long asm_default_interrupt
vector224: .long asm_default_interrupt
vector225: .long asm_default_interrupt
vector226: .long asm_default_interrupt
vector227: .long asm_default_interrupt
vector228: .long asm_default_interrupt
vector229: .long asm_default_interrupt
vector230: .long asm_default_interrupt
vector231: .long asm_default_interrupt
vector232: .long asm_default_interrupt
vector233: .long asm_default_interrupt
vector234: .long asm_default_interrupt
vector235: .long asm_default_interrupt
vector236: .long asm_default_interrupt
vector237: .long asm_default_interrupt
vector238: .long asm_default_interrupt
vector239: .long asm_default_interrupt
vector240: .long asm_default_interrupt
vector241: .long asm_default_interrupt
vector242: .long asm_default_interrupt
vector243: .long asm_default_interrupt
vector244: .long asm_default_interrupt
vector245: .long asm_default_interrupt
vector246: .long asm_default_interrupt
vector247: .long asm_default_interrupt
vector248: .long asm_default_interrupt
vector249: .long asm_default_interrupt
vector250: .long asm_default_interrupt
vector251: .long asm_default_interrupt
vector252: .long asm_default_interrupt
vector253: .long asm_default_interrupt
vector254: .long asm_default_interrupt
vector255: .long asm_default_interrupt
/*===============================================================*\
| Start of code |
\*===============================================================*/
.text
PUBLIC (start)
SYM(start):
move.w #0x3700,sr /* disable interrupts */
jmp start_init
/*===============================================================*\
| Sspurious interrupt counter |
\*===============================================================*/
.align 4
.data /* begin of data section */
PUBLIC (spurious_int_count)
SYM(spurious_int_count):
.long 0 /* spurious interrupt counter */
/*===============================================================*\
| Function: Default exception handler |
+-----------------------------------------------------------------+
| - stop and disable all interrupts |
| - loop forever |
\*===============================================================*/
.text /* start of text section */
.align 4
PUBLIC (asm_default_interrupt)
SYM(asm_default_interrupt):
nop
stop #0x3700 /* stop */
bra.w asm_default_interrupt /* loop forever */
/*===============================================================*\
| Function: Exception handler for spurious interrupts |
+-----------------------------------------------------------------+
| - count spurious interrupts |
\*===============================================================*/
.align 4
PUBLIC (asm_spurious_interrupt)
SYM(asm_spurious_interrupt):
add.l #1,spurious_int_count
rte
/*===============================================================*\
| Function: start_init |
+-----------------------------------------------------------------+
| - Disable all intterupts |
| - Setup the internal SRAM |
| - Initialize mcf548x peripherals |
| - Set initial stack pointer |
| - Boot RTEMS
\*===============================================================*/
.align 4
PUBLIC (start_init)
SYM(start_init):
move.l #0x01040100,d0 /* invalidate instruction/data/branch cache, disable all caches */
movec d0,cacr
move.l #_CoreSramBase0,d0 /* initialize RAMBAR0 */
add.l #0x21,d0 /* for code & data */
movec d0,rambar0
move.l #_CoreSramBase1,d0 /* initialize RAMBAR1 */
add.l #0x21,d0 /* for code & data */
movec d0,rambar1 /* movec d0,RAMBAR1 */
move.l #__MBAR,d0 /* initialize MBAR */
movec d0,mbar
move.l #_CoreSramBase1,d0 /* set sp to end of Core SRAM temporarily */
add.l #_CoreSramSize1,d0
move.l d0,sp
move.l #0,d0 /* initialize frame pointer */
movea.l d0,a6
jsr mcf548x_init /* Initialize mcf548x peripherals */
move.l #_Configuration_Interrupt_stack_area_end,sp /* relocate sp */
clrl d0 /* clear d0 */
movel d0,a7@- /* command line == 0 */
jsr boot_card /* boot rtems */
movel a7@+,d0
exit_multitasking:
nop
nop
halt
bra exit_multitasking
.end /* end of start.S module */
View Git Blame Copy Permalink