diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/compressed/head-shark.S | 42 |
1 files changed, 33 insertions, 9 deletions
diff --git a/arch/arm/boot/compressed/head-shark.S b/arch/arm/boot/compressed/head-shark.S index 848f60e5429b..089c560e07f1 100644 --- a/arch/arm/boot/compressed/head-shark.S +++ b/arch/arm/boot/compressed/head-shark.S | |||
| @@ -63,8 +63,8 @@ __beginning: mov r4, r0 @ save the entry to the firmware | |||
| 63 | 63 | ||
| 64 | mov pc, r2 | 64 | mov pc, r2 |
| 65 | 65 | ||
| 66 | __copy_target: .long 0x08508000 | 66 | __copy_target: .long 0x08507FFC |
| 67 | __copy_end: .long 0x08608000 | 67 | __copy_end: .long 0x08607FFC |
| 68 | 68 | ||
| 69 | .word _start | 69 | .word _start |
| 70 | .word __bss_start | 70 | .word __bss_start |
| @@ -73,9 +73,10 @@ __copy_end: .long 0x08608000 | |||
| 73 | __temp_stack: .space 128 | 73 | __temp_stack: .space 128 |
| 74 | 74 | ||
| 75 | __mmu_off: | 75 | __mmu_off: |
| 76 | adr r0, __ofw_data | 76 | adr r0, __ofw_data @ read the 1. entry of the memory map |
| 77 | ldr r0, [r0, #4] | 77 | ldr r0, [r0, #4] |
| 78 | orr r0, r0, #0x00600000 | 78 | orr r0, r0, #0x00600000 |
| 79 | sub r0, r0, #4 | ||
| 79 | 80 | ||
| 80 | ldr r1, __copy_end | 81 | ldr r1, __copy_end |
| 81 | ldr r3, __copy_target | 82 | ldr r3, __copy_target |
| @@ -89,20 +90,43 @@ __mmu_off: | |||
| 89 | * from 0x08500000 to 0x08508000 if we have only 8MB | 90 | * from 0x08500000 to 0x08508000 if we have only 8MB |
| 90 | */ | 91 | */ |
| 91 | 92 | ||
| 93 | /* As we get more 2.6-kernels it gets more and more | ||
| 94 | * uncomfortable to be bound to kernel images of 1MB only. | ||
| 95 | * So we add a loop here, to be able to copy some more. | ||
| 96 | * Alexander Schulz 2005-07-17 | ||
| 97 | */ | ||
| 98 | |||
| 99 | mov r4, #3 @ How many megabytes to copy | ||
| 100 | |||
| 101 | |||
| 102 | __MoveCode: sub r4, r4, #1 | ||
| 92 | 103 | ||
| 93 | __Copy: ldr r2, [r0], #-4 | 104 | __Copy: ldr r2, [r0], #-4 |
| 94 | str r2, [r1], #-4 | 105 | str r2, [r1], #-4 |
| 95 | teq r1, r3 | 106 | teq r1, r3 |
| 96 | bne __Copy | 107 | bne __Copy |
| 108 | |||
| 109 | /* The firmware maps us in blocks of 1 MB, the next block is | ||
| 110 | _below_ the last one. So our decrementing source pointer | ||
| 111 | ist right here, but the destination pointer must be increased | ||
| 112 | by 2 MB */ | ||
| 113 | add r1, r1, #0x00200000 | ||
| 114 | add r3, r3, #0x00100000 | ||
| 115 | |||
| 116 | teq r4, #0 | ||
| 117 | bne __MoveCode | ||
| 118 | |||
| 119 | |||
| 97 | /* and jump to it */ | 120 | /* and jump to it */ |
| 98 | adr r2, __go_on | 121 | adr r2, __go_on @ where we want to jump |
| 99 | adr r0, __ofw_data | 122 | adr r0, __ofw_data @ read the 1. entry of the memory map |
| 100 | ldr r0, [r0, #4] | 123 | ldr r0, [r0, #4] |
| 101 | sub r2, r2, r0 | 124 | sub r2, r2, r0 @ we are mapped add 0e50 now, sub that (-0e00) |
| 102 | sub r2, r2, #0x00500000 | 125 | sub r2, r2, #0x00500000 @ -0050 |
| 103 | ldr r0, __copy_target | 126 | ldr r0, __copy_target @ and add 0850 8000 instead |
| 127 | add r0, r0, #4 | ||
| 104 | add r2, r2, r0 | 128 | add r2, r2, r0 |
| 105 | mov pc, r2 | 129 | mov pc, r2 @ and jump there |
| 106 | 130 | ||
| 107 | __go_on: | 131 | __go_on: |
| 108 | adr sp, __temp_stack | 132 | adr sp, __temp_stack |