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pcireg: Improve IRQ steering link value heuristics

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RichardG867
2023-10-05 15:55:04 -03:00
parent ac20751927
commit 2bef082067
1 changed files with 24 additions and 1 deletions
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25
pcireg/pcireg.c
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@@ -992,6 +992,29 @@ comp_irq_routing_entry(const void *elem1, const void *elem2)
return comp_ui8(&a->dev, &b->dev);
}
static int
comp_irq_routing_link(const void *elem1, const void *elem2)
{
uint8_t a = *((uint8_t *) elem1);
uint8_t b = *((uint8_t *) elem2);
/* IRQ link values are highly chipset-dependent. For VIA and ALi chipsets,
we can get away with rotating the values left by 1 to get an ascending
order. Naturally, there are exceptions, but this should cover most cases. */
/* Special case for ALi M1489 AMIBIOS 6, actual order unconfirmed. */
if (a == 0x89)
a = 0xc1; /* immediately after 0x41 */
if (b == 0x89)
b = 0xc1;
/* Perform rotation. */
a = (a << 1) | (a >> 7);
b = (b << 1) | (b >> 7);
return comp_ui8(&a, &b);
}
static int
free_realmode(uint16_t segment)
{
@@ -1140,7 +1163,7 @@ retry_buf:
}
/* Sort link value entries. */
qsort(irq_bitmap, sizeof(irq_bitmap), sizeof(irq_bitmap[0]), comp_ui8);
qsort(irq_bitmap, sizeof(irq_bitmap), sizeof(irq_bitmap[0]), comp_irq_routing_link);
/* Jump to the first non-zero link value entry. */
for (i = 0; (i < sizeof(irq_bitmap)) && (!irq_bitmap[i]); i++)