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-rw-r--r--src/include/device/pci_mmio_cfg.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/include/device/pci_mmio_cfg.h b/src/include/device/pci_mmio_cfg.h
index 8f26ff29b0..30945f4c27 100644
--- a/src/include/device/pci_mmio_cfg.h
+++ b/src/include/device/pci_mmio_cfg.h
@@ -86,6 +86,12 @@ void pci_mmio_write_config32(pci_devfn_t dev, uint16_t reg, uint32_t value)
pcicfg(dev)->reg32[reg / sizeof(uint32_t)] = value;
}
+/*
+ * The functions pci_mmio_config*_addr provide a way to determine the MMIO address of a PCI
+ * config register. The address returned is dependent of both the MMCONF base address and the
+ * assigned PCI bus number of the requested device, which both can change during the boot
+ * process. Thus, the pointer returned here must not be cached!
+ */
static __always_inline
uint8_t *pci_mmio_config8_addr(pci_devfn_t dev, uint16_t reg)
{