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Last change
on this file was
2243,
checked in by wmb, 2 years ago
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OLPC XO-1.75 - Moved the page table into the firmware RAM area, so the only precious thing in low memory is the vector table. This makes it easier to test memory.
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File size:
852 bytes
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| 1 | \ This is some glue code to convert the machine setup that QEMU gives us |
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| 2 | \ to the setup that start-forth (see arm/boot.fth) wants. |
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| 3 | \ We get here via a call instruction at origin+8, which is inserted below |
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| 4 | |
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| 5 | label stand-cold-code ( r0: 0 r1: board-id r2: &kernel-args lr: &aif_header+8c ) |
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| 6 | here origin 8 + put-call \ Insert call instruction |
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| 7 | |
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| 8 | \ Put the arguments in safe registers |
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| 9 | sub r6,lr,#0x8c \ r6 points to header (lr set by code at origin) |
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| 10 | mov r7,#0 \ r7: functions |
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| 11 | add r8,r6,`stack-offset` \ r8: memtop - 2MiB above load address |
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| 12 | \ r9 is up |
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| 13 | mov r10,#0 \ r10: argc |
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| 14 | mov r11,r2 \ r11: argv (kernel args) |
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| 15 | mov r12,`initial-heap-size` \ r12: initial-heap-size |
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| 16 | |
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| 17 | b 'code start-forth \ Branch to the generic startup code |
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| 18 | end-code |
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