Home Explore Help
Register Sign In
phyus
/
uboot-vybrid_public
8
0
Fork 0
Files Issues 0 Pull Requests 0 Wiki
Tree: 5599c28cef
Branches Tags
uboot-vybrid_pu...
/
board
/
qemu-mips
/
lowlevel_init.S

lowlevel_init.S 614 B
History Raw

1234567891011121314151617181920212223242526272829303132333435363738394041 
  1. /* Memory sub-system initialization code */
    2. 

  2. 

  3. #include <config.h>
    4. 

  4. #include <version.h>
    5. 

  5. #include <asm/regdef.h>
    6. 

  6. #include <asm/mipsregs.h>
    7. 

  7. 

  8. 	.text
    9. 

  9. 	.set noreorder
    10. 

  10. 	.set mips32
    11. 

  11. 

  12. 	.globl	lowlevel_init
    13. 

  13. lowlevel_init:
    14. 

  14. 

  15. 	/*
    16. 

  16. 	 * Step 2) Establish Status Register
    17. 

  17. 	 * (set BEV, clear ERL, clear EXL, clear IE)
    18. 

  18. 	 */
    19. 

  19. 	li	t1, 0x00400000
    20. 

  20. 	mtc0	t1, CP0_STATUS
    21. 

  21. 

  22. 	/*
    23. 

  23. 	 * Step 3) Establish CP0 Config0
    24. 

  24. 	 * (set K0=3)
    25. 

  25. 	 */
    26. 

  26. 	li	t1, 0x00000003
    27. 

  27. 	mtc0	t1, CP0_CONFIG
    28. 

  28. 

  29. 	/*
    30. 

  30. 	 * Step 7) Establish Cause
    31. 

  31. 	 * (set IV bit)
    32. 

  32. 	 */
    33. 

  33. 	li	t1, 0x00800000
    34. 

  34. 	mtc0	t1, CP0_CAUSE
    35. 

  35. 

  36. 	/* Establish Wired (and Random) */
    37. 

  37. 	mtc0	zero, CP0_WIRED
    38. 

  38. 	nop
    39. 

  39. 

  40. 	j	ra
    41. 

  41. 	nop
    42.