crt0_ram.s

microwindows移植到S3C44B0的源码

    move.l	#_ramvec, %a1
    movec	%a1, %vbr


	/* Copy data segment from ROM to RAM */
	moveal	#__data_rom_start, %a0
	moveal	#__data_start, %a1
	moveal	#__data_end, %a2

	/* Copy %a0 to %a1 until %a1 == %a2 */
LD1:
    move.l  %a0@,   %d0
    addq.l  #0x04,  %a0
    move.l  %d0,    %a1@
    addq.l  #0x04,  %a1
    cmp.l   #__data_end,    %a1
    blt     LD1

	moveal	#__bss_start, %a0
	moveal	#end, %a1

	/* Copy 0 to %a0 until %a0 == %a1 */
L1:
	movel	#0, %a0@+
	cmpal	%a0, %a1
	bhi	L1

load_quicc:
    move.l  #_dprbase,  _quicc_base

store_ram_size:
    /* Set ram size information */
    move.l  #_sdata,    _rambase
    move.l  #end,       _ramstart
    move.l  #__ramend,  %d0
    sub.l   #0x1000,    %d0     /* Reserve 4K for stack space.*/
    move.l  %d0,        _ramend /* Different from __ramend.*/

store_flash_size:
    /* Set rom size information */
    move.l  #__flashend,    %d0
    sub.l   #__flashstart,  %d0
    move.l  %d0,            rom_length
    
	pea	0
	pea	env
	pea	%sp@(4)
	pea	0

    lea     init_task_union,    %a2
    move.l  %a2,                _current_task
    lea     0x2000(%a2),        %sp

lp:
    jsr	start_kernel
 /*   jmp lp */

_exit:

	jmp	_exit



	.data
    .align 4
env:
	.long	0
_quicc_base:
	.long	0
_periph_base:
	.long	0
_ramvec:
    .long   0
_rambase:
    .long   0
_ramstart:
    .long   0
_ramend:
    .long   0
	.text

    /*
     * These are the exception vectors at boot up, they are copied into RAM
     * and then overwritten as needed.
     */
 
.section ".data.initvect","awx"
    .long   _boot_stack /* Reset: Initial Stack Pointer                 - 0.  */
    .long   _start      /* Reset: Initial Program Counter               - 1.  */
    .long   buserr      /* Bus Error                                    - 2.  */
    .long   trap        /* Address Error                                - 3.  */
    .long   trap        /* Illegal Instruction                          - 4.  */
    .long   trap        /* Divide by zero                               - 5.  */
    .long   trap        /* CHK, CHK2 Instructions                       - 6.  */
    .long   trap        /* TRAPcc, TRAPV Instructions                   - 7.  */
    .long   trap        /* Privilege Violation                          - 8.  */
    .long   trap        /* Trace                                        - 9.  */
    .long   trap        /* Line 1010 Emulator                           - 10. */
    .long   trap        /* Line 1111 Emualtor                           - 11. */
    .long   trap        /* Harware Breakpoint                           - 12. */
    .long   trap        /* (Reserved for Coprocessor Protocol Violation)- 13. */
    .long   trap        /* Format Error                                 - 14. */
    .long   trap        /* Uninitialized Interrupt                      - 15. */
    .long   trap        /* (Unassigned, Reserver)                       - 16. */
    .long   trap        /* (Unassigned, Reserver)                       - 17. */
    .long   trap        /* (Unassigned, Reserver)                       - 18. */
    .long   trap        /* (Unassigned, Reserver)                       - 19. */
    .long   trap        /* (Unassigned, Reserver)                       - 20. */
    .long   trap        /* (Unassigned, Reserver)                       - 21. */
    .long   trap        /* (Unassigned, Reserver)                       - 22. */
    .long   trap        /* (Unassigned, Reserver)                       - 23. */
    .long   trap        /* Spurious Interrupt                           - 24. */
    .long   trap        /* Level 1 Interrupt Autovector                 - 25. */
    .long   trap        /* Level 2 Interrupt Autovector                 - 26. */
    .long   trap        /* Level 3 Interrupt Autovector                 - 27. */
    .long   trap        /* Level 4 Interrupt Autovector                 - 28. */
    .long   trap        /* Level 5 Interrupt Autovector                 - 29. */
    .long   trap        /* Level 6 Interrupt Autovector                 - 30. */
    .long   trap        /* Level 7 Interrupt Autovector                 - 31. */
    .long   system_call /* Trap Instruction Vectors 0                   - 32. */
    .long   trap        /* Trap Instruction Vectors 1                   - 33. */
    .long   trap        /* Trap Instruction Vectors 2                   - 34. */
    .long   trap        /* Trap Instruction Vectors 3                   - 35. */
    .long   trap        /* Trap Instruction Vectors 4                   - 36. */
    .long   trap        /* Trap Instruction Vectors 5                   - 37. */
    .long   trap        /* Trap Instruction Vectors 6                   - 38. */
    .long   trap        /* Trap Instruction Vectors 7                   - 39. */
    .long   trap        /* Trap Instruction Vectors 8                   - 40. */
    .long   trap        /* Trap Instruction Vectors 9                   - 41. */
    .long   trap        /* Trap Instruction Vectors 10                  - 42. */
    .long   trap        /* Trap Instruction Vectors 11                  - 43. */
    .long   trap        /* Trap Instruction Vectors 12                  - 44. */
    .long   trap        /* Trap Instruction Vectors 13                  - 45. */
    .long   trap        /* Trap Instruction Vectors 14                  - 46. */
    .long   trap        /* Trap Instruction Vectors 15                  - 47. */
    .long   0           /* (Reserved for Coprocessor)                   - 48. */
    .long   0           /* (Reserved for Coprocessor)                   - 49. */
    .long   0           /* (Reserved for Coprocessor)                   - 50. */
    .long   0           /* (Reserved for Coprocessor)                   - 51. */
    .long   0           /* (Reserved for Coprocessor)                   - 52. */
    .long   0           /* (Reserved for Coprocessor)                   - 53. */
    .long   0           /* (Reserved for Coprocessor)                   - 54. */
    .long   0           /* (Reserved for Coprocessor)                   - 55. */
    .long   0           /* (Reserved for Coprocessor)                   - 56. */
    .long   0           /* (Reserved for Coprocessor)                   - 57. */
    .long   0           /* (Reserved for Coprocessor)                   - 58. */
    .long   0           /* (Unassigned, Reserved)                       - 59. */
    .long   0           /* (Unassigned, Reserved)                       - 60. */
    .long   0           /* (Unassigned, Reserved)                       - 61. */
    .long   0           /* (Unassigned, Reserved)                       - 62. */
    .long   0           /* (Unassigned, Reserved)                       - 63. */
    /*                  The assignment of these vectors to the CPM is         */
    /*                  dependant on the configuration of the CPM vba         */
    /*                          fields.                                       */
    .long   0           /* (User-Defined Vectors 1) CPM Error           - 64. */
    .long   0           /* (User-Defined Vectors 2) CPM Parallel IO PC11- 65. */
    .long   0           /* (User-Defined Vectors 3) CPM Parallel IO PC10- 66. */
    .long   0           /* (User-Defined Vectors 4) CPM SMC2 / PIP      - 67. */
    .long   0           /* (User-Defined Vectors 5) CPM SMC1            - 68. */
    .long   0           /* (User-Defined Vectors 6) CPM SPI             - 69. */
    .long   0           /* (User-Defined Vectors 7) CPM Parallel IO PC9 - 70. */
    .long   0           /* (User-Defined Vectors 8) CPM Timer 4         - 71. */
    .long   0           /* (User-Defined Vectors 9) CPM Reserved        - 72. */
    .long   0           /* (User-Defined Vectors 10) CPM Parallel IO PC8- 73. */
    .long   0           /* (User-Defined Vectors 11) CPM Parallel IO PC7- 74. */
    .long   0           /* (User-Defined Vectors 12) CPM Parallel IO PC6- 75. */
    .long   0           /* (User-Defined Vectors 13) CPM Timer 3        - 76. */
    .long   0           /* (User-Defined Vectors 14) CPM Reserved       - 77. */
    .long   0           /* (User-Defined Vectors 15) CPM Parallel IO PC5- 78. */
    .long   0           /* (User-Defined Vectors 16) CPM Parallel IO PC4- 79. */
    .long   0           /* (User-Defined Vectors 17) CPM Reserved       - 80. */
    .long   0           /* (User-Defined Vectors 18) CPM RISC Timer Tbl - 81. */
    .long   0           /* (User-Defined Vectors 19) CPM Timer 2        - 82. */
    .long   0           /* (User-Defined Vectors 21) CPM Reserved       - 83. */
    .long   0           /* (User-Defined Vectors 22) CPM IDMA2          - 84. */
    .long   0           /* (User-Defined Vectors 23) CPM IDMA1          - 85. */
    .long   0           /* (User-Defined Vectors 24) CPM SDMA Bus Err   - 86. */
    .long   0           /* (User-Defined Vectors 25) CPM Parallel IO PC3- 87. */
    .long   0           /* (User-Defined Vectors 26) CPM Parallel IO PC2- 88. */
    .long   0           /* (User-Defined Vectors 27) CPM Timer 1        - 89. */
    .long   0           /* (User-Defined Vectors 28) CPM Parallel IO PC1- 90. */
    .long   0           /* (User-Defined Vectors 29) CPM SCC 4          - 91. */
    .long   0           /* (User-Defined Vectors 30) CPM SCC 3          - 92. */
    .long   0           /* (User-Defined Vectors 31) CPM SCC 2          - 93. */
    .long   0           /* (User-Defined Vectors 32) CPM SCC 1          - 94. */
    .long   0           /* (User-Defined Vectors 33) CPM Parallel IO PC0- 95. */
    /*                  I don't think anything uses the vectors after here.   */
    .long   0           /* (User-Defined Vectors 34)                    - 96. */
    .long   0,0,0,0,0               /* (User-Defined Vectors 35  -  39). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 40  -  49). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 50  -  59). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 60  -  69). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 70  -  79). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 80  -  89). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 90  -  99). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 100 - 109). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 110 - 119). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 120 - 129). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 130 - 139). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 140 - 149). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 150 - 159). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 160 - 169). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 170 - 179). */
    .long   0,0,0,0,0,0,0,0,0,0     /* (User-Defined Vectors 180 - 189). */
    .long   0,0,0                   /* (User-Defined Vectors 190 - 192). */
.text
ignore: rte