stand/efi: Document the copy size trick
We call bi_copymodules twice: once with 0 and once with the size of the arena. We do this to find the size, it turns out. Document this. Sponsored by: Netflix
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@ -413,7 +413,7 @@ bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs)
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#endif
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bi_load_efi_data(kfp, exit_bs);
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size = md_copymodules(0, is64);
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size = md_copymodules(0, is64); /* Find the size of the modules */
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kernend = roundup(addr + size, PAGE_SIZE);
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*kernendp = kernend;
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