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pci: fix msi

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Matheus
2026-05-14 14:34:14 -03:00
parent f9912b8970
commit 58c749b9ba
1 changed files with 8 additions and 5 deletions
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kernel-src/io/pci.c
+8 -5
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@@ -131,7 +131,7 @@ size_t pci_initmsi(pcienum_t *e, int requested) {
return 0;
uint16_t msgctl = PCI_READ16(e, e->msi.offset + 2);
msgctl |= PCI_MSI_ENABLE;
msgctl &= ~PCI_MSI_ENABLE;
msgctl &= ~(PCI_MSI_MULTIPLE_MESSAGE_SUPPORT_MASK); // no multiple message support
PCI_WRITE16(e, e->msi.offset + 2, msgctl);
@@ -159,22 +159,25 @@ void pci_msisetbase(pcienum_t *e, int base, int edgetrigger, int deassert) {
// data
PCI_WRITE16(e, e->msi.offset + dataoffset, data);
uint16_t msgctl = PCI_READ16(e, e->msi.offset + 2);
PCI_WRITE16(e, e->msi.offset + 2, msgctl | PCI_MSI_ENABLE);
}
void pci_msisetmask(pcienum_t *e, int vector, int value) {
uint32_t msgctl = PCI_READ16(e, e->msi.offset + 2);
if (msgctl & PCI_MSI_PER_VECTOR_MASKING) {
uint32_t maskbits = PCI_READ32(e, e->msi.offset + 16);
bool is64bit = msgctl & PCI_MSI_64BIT;
int maskoffset = e->msi.offset + (is64bit ? 16 : 12);
uint32_t maskbits = PCI_READ32(e, maskoffset);
if (value)
maskbits |= 1 << vector;
else
maskbits &= ~(1 << vector);
PCI_WRITE32(e, e->msi.offset + 16, maskbits);
} else {
printf("pci: tried to mask msi vector without support\n");
PCI_WRITE32(e, maskoffset, maskbits);
}
}