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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | SPARTAN kernel currently supports emulated MIPS R4000 32-bit |
| 2 | little-endian architecture. In other words, it can only run in MIPS |
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| 3 | R4000 emulator called msim. This emulator is being developed by Viliam |
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| 4 | Holub: |
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| 5 | |||
| 6 | http://nenya.ms.mff.cuni.cz/~holub/msim |
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| 7 | |||
| 8 | Note that msim diverges from real MIPS hardware in some aspects. |
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| 9 | Therefore, some non-trivial changes will be necessary for a real |
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| 10 | hardware port. The simulator is described in this manual: |
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| 11 | |||
| 12 | http://nenya.ms.mff.cuni.cz/~holub/msim/msim.ps |
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| 13 | |||
| 14 | You'll need a msim.conf script like this: |
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| 15 | |||
| 16 | # |
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| 17 | # MSIM configuration script |
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| 18 | # |
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| 19 | |||
| 20 | add dcpu mips1 |
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| 21 | |||
| 22 | add rwm mainmem 0 16M load "kernel.bin" |
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| 23 | add rom startmem 0x1fc00000 1k load "load.bin" |
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| 24 | |||
| 25 | add dprinter printer 0xA000000 |
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| 29 | BOOTSTRAP |
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| 30 | ========= |
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| 31 | Because the mips port uses binary executable format and for some other |
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| 32 | architectural reasons, it shares one address for bootstrap entry |
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| 33 | (address where control is passed from loader) and for TLB refill |
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| 34 | exception entry. The former is used only once during system bootstrap. |
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| 35 | From that point further, only TLB refill exception entry uses that |
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| 36 | address. Note that this is the reason why main_bsp() is called from |
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| 37 | tlb_refill() code. |