fb3c7e04c4
This includes both separate .md files, and documentation that was on the head of the .S source files. Retest everything as this was done, and fix a few easy things.
51 lines
1.7 KiB
Plaintext
51 lines
1.7 KiB
Plaintext
SECTIONS
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{
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/* We could also pass the -Ttext 0x7C00 to as instead of doing this.
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* If your program does not have any memory accesses, you can omit this.
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*/
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. = 0x7c00;
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.text :
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{
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__start = .;
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/* We are going to stuff everything
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* into a text segment for now, including data.
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* Who cares? Other segments only exist to appease C compilers.
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*/
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*(.text)
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/* Magic bytes. 0x1FE == 510.
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*
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* We could add this on each Gas file separately with `.word`,
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* but this is the perfect place to DRY that out.
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*/
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. = 0x1FE;
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SHORT(0xAA55)
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/* This is only needed if we are going to use a 2 stage boot process,
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* e.g. by reading more disk than the default 512 bytes with BIOS `int 0x13`.
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*/
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*(.stage2)
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/* Number of sectors in stage 2. Used by the `int 13` to load it from disk.
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*
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* The value gets put into memory as the very last thing
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* in the `.stage` section if it exists.
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*
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* We must put it *before* the final `. = ALIGN(512)`,
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* or else it would fall out of the loaded memory.
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*
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* This must be absolute, or else it would get converted
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* to the actual address relative to this section (7c00 + ...)
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* and linking would fail with "Relocation truncated to fit"
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* because we are trying to put that into al for the int 13.
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*/
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__stage2_nsectors = ABSOLUTE((. - __start) / 512);
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/* Ensure that the generated image is a multiple of 512 bytes long. */
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. = ALIGN(512);
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__end = .;
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__end_align_4k = ALIGN(4k);
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}
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}
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