Mercurial > nand-ecoscentric
comparison packages/hal/sparclite/arch/current/ChangeLog @ 46:797268ecc331 ecos-sw-1999-10-19
Merge from eCos master repository on 1999-10-19-18:55:31-BST
| author | jlarmour |
|---|---|
| date | Tue, 19 Oct 1999 19:19:52 +0000 |
| parents | a3cc6665b684 |
| children | c38311975d4f |
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| 45:91d213c0da48 | 46:797268ecc331 |
|---|---|
| 1 1999-10-15 Hugo Tyson <hmt@cygnus.co.uk> | |
| 2 | |
| 3 * src/vectors.S (not_window_overflow): Actually the dispatcher | |
| 4 into exception VSRs. Bugfix: wrong number was placed in %l3 for | |
| 5 call to xvsr, so for *some* types of trap, including user traps | |
| 6 other than those handled directly in-HAL, a vector way off the end | |
| 7 of the array would be used. Apparently those other types of trap | |
| 8 never happen, but just in case... | |
| 9 | |
| 10 1999-10-13 Hugo Tyson <hmt@cygnus.co.uk> | |
| 11 | |
| 12 * src/vectors.S: Optionally implement Multiple (rather than | |
| 13 Single) Vector Trapping. The config options to control this are | |
| 14 in the platform HAL because some SPARCs do not support SVT, where | |
| 15 it is optional the platform says so. This demands a variable | |
| 16 sized region be reserved for trampoline code or the vectors in | |
| 17 RAM, which is done via section .ram_vectors, defined herein. | |
| 18 | |
| 19 * src/sparclite.ld: Define SECTION_ram_vectors(...) to deal with | |
| 20 the new .ram_vectors section. This is to provide a variable sized | |
| 21 area at the start of RAM to hold either trampoline code when SVT | |
| 22 is selected, or a fill 4k + handlers of vectors when MVT is | |
| 23 selected. Previously this was bodged by pretending RAM starts at | |
| 24 0x4000200 in ROM startup builds. | |
| 25 (comment from the example .ldi files...) | |
| 26 The ram_vectors section is to allow some free space to copy | |
| 27 vectors into from the ROM. This is required to be variable size | |
| 28 to accomodate SVT or MVT; 80 bytes vs 4kB. Copying is not | |
| 29 necessary with MVT, but it is optional because it may offer | |
| 30 performance gains. Copying is required for SVT because the | |
| 31 (aligned) start of ROM contains initialization instructions. RAM | |
| 32 copy is used rather than leave a big gap in the ROM to get an | |
| 33 aligned address for the trampoline code. For RAM startup, | |
| 34 ram_vectors will usually be of size zero, unless MVT and copying | |
| 35 are enabled for memory estimation reasons. | |
| 36 | |
| 1 1999-09-29 Hugo Tyson <hmt@cygnus.co.uk> | 37 1999-09-29 Hugo Tyson <hmt@cygnus.co.uk> |
| 2 | 38 |
| 3 [src/vectors.S: needed no change!] | 39 [src/vectors.S: needed no change!] |
| 4 | 40 |
| 5 * include/vectors.h: Potentially accept a register window count | 41 * include/vectors.h: Potentially accept a register window count |