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mach-omap2
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omap-headsmp.S

omap-headsmp.S 1.2 KB
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  1. /*
    2. 

  2.  * Secondary CPU startup routine source file.
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2009 Texas Instruments, Inc.
    5. 

  5.  *
    6. 

  6.  * Author:
    7. 

  7.  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
    8. 

  8.  *
    9. 

  9.  * Interface functions needed for the SMP. This file is based on arm
    10. 

  10.  * realview smp platform.
    11. 

  11.  * Copyright (c) 2003 ARM Limited.
    12. 

  12.  *
    13. 

  13.  * This program is free software,you can redistribute it and/or modify
    14. 

  14.  * it under the terms of the GNU General Public License version 2 as
    15. 

  15.  * published by the Free Software Foundation.
    16. 

  16.  */
    17. 

  17. 

  18. #include <linux/linkage.h>
    19. 

  19. #include <linux/init.h>
    20. 

  20. 

  21. 	__CPUINIT
    22. 

  22. /*
    23. 

  23.  * OMAP4 specific entry point for secondary CPU to jump from ROM
    24. 

  24.  * code.  This routine also provides a holding flag into which
    25. 

  25.  * secondary core is held until we're ready for it to initialise.
    26. 

  26.  * The primary core will update this flag using a hardware
    27. 

  27.  * register AuxCoreBoot0.
    28. 

  28.  */
    29. 

  29. ENTRY(omap_secondary_startup)
    30. 

  30. hold:	ldr	r12,=0x103
    31. 

  31. 	dsb
    32. 

  32. 	smc	#0			@ read from AuxCoreBoot0
    33. 

  33. 	mov	r0, r0, lsr #9
    34. 

  34. 	mrc	p15, 0, r4, c0, c0, 5
    35. 

  35. 	and	r4, r4, #0x0f
    36. 

  36. 	cmp	r0, r4
    37. 

  37. 	bne	hold
    38. 

  38. 

  39. 	/*
    40. 

  40. 	 * we've been released from the wait loop,secondary_stack
    41. 

  41. 	 * should now contain the SVC stack for this core
    42. 

  42. 	 */
    43. 

  43. 	b	secondary_startup
    44. 

  44. ENDPROC(omap_secondary_startup)
    45. 

  45.