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loader.efi: repace XXX with real comments in trap.c
There are two missing comments marked as XXX in trap.c, fix this. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D12035
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=322542
@ -84,7 +84,11 @@ void
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report_exc(struct trapframe *tf)
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{
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/* XXX using printf */
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/*
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* printf() depends on loader runtime and UEFI firmware health
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* to produce the console output, in case of exception, the
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* loader or firmware runtime may fail to support the printf().
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*/
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printf("===================================================="
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"============================\n");
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printf("Exception %u\n", tf->tf_trapno);
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@ -122,7 +126,13 @@ prepare_exception(unsigned idx, uint64_t my_handler,
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ist_use_table[fw_idt_e->gd_ist]++;
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loader_idt_e->gd_looffset = my_handler;
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loader_idt_e->gd_hioffset = my_handler >> 16;
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loader_idt_e->gd_selector = fw_idt_e->gd_selector; /* XXX */
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/*
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* We reuse uefi selector for the code segment for the exception
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* handler code, while the reason for the fault might be the
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* corruption of that gdt entry. On the other hand, allocating
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* our own descriptor might be not much better, if gdt is corrupted.
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*/
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loader_idt_e->gd_selector = fw_idt_e->gd_selector;
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loader_idt_e->gd_ist = 0;
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loader_idt_e->gd_type = SDT_SYSIGT;
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loader_idt_e->gd_dpl = 0;
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