Patrick Georgi merged this change.
arch/x86: Fix PCI IO config accessor
In case PCI_IO_CFG_EXT=n parameter 'reg' was not
properly truncated to 8 bits and it would overflow
to dev.fn part of the register.
A similar thing could happen with 'dev' but that
value originates from PCI_DEV() macro unlike 'reg'.
Change-Id: Id2888e07fc0f2b182b4633a747c1786e5c560678
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31847
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
M src/arch/x86/include/arch/pci_io_cfg.h
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/src/arch/x86/include/arch/pci_io_cfg.h b/src/arch/x86/include/arch/pci_io_cfg.h
index 6c88b3c..1e6934a 100644
--- a/src/arch/x86/include/arch/pci_io_cfg.h
+++ b/src/arch/x86/include/arch/pci_io_cfg.h
@@ -21,19 +21,22 @@
static __always_inline
uint32_t pci_io_encode_addr(pci_devfn_t dev, uint16_t reg)
{
- if (CONFIG(PCI_IO_CFG_EXT)) {
- // seg == 0
- return dev >> 4 | (reg & 0xff) | ((reg & 0xf00) << 16);
- } else {
- return dev >> 4 | reg;
- }
+ uint32_t addr = 1 << 31;
+
+ addr |= dev >> 4;
+ addr |= reg & 0xfc;
+
+ if (CONFIG(PCI_IO_CFG_EXT))
+ addr |= (reg & 0xf00) << 16;
+
+ return addr;
}
static __always_inline
uint8_t pci_io_read_config8(pci_devfn_t dev, uint16_t reg)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
return inb(0xCFC + (reg & 3));
}
@@ -41,7 +44,7 @@
uint16_t pci_io_read_config16(pci_devfn_t dev, uint16_t reg)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
return inw(0xCFC + (reg & 2));
}
@@ -49,7 +52,7 @@
uint32_t pci_io_read_config32(pci_devfn_t dev, uint16_t reg)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
return inl(0xCFC);
}
@@ -57,7 +60,7 @@
void pci_io_write_config8(pci_devfn_t dev, uint16_t reg, uint8_t value)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
outb(value, 0xCFC + (reg & 3));
}
@@ -65,7 +68,7 @@
void pci_io_write_config16(pci_devfn_t dev, uint16_t reg, uint16_t value)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
outw(value, 0xCFC + (reg & 2));
}
@@ -73,7 +76,7 @@
void pci_io_write_config32(pci_devfn_t dev, uint16_t reg, uint32_t value)
{
uint32_t addr = pci_io_encode_addr(dev, reg);
- outl(0x80000000 | (addr & ~3), 0xCF8);
+ outl(addr, 0xCF8);
outl(value, 0xCFC);
}
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