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pci_bridge: factor out common code

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Reuse common code in pcie_port, override the hardwired-to-0
bits per PCI Express spec.
No functional change but makes the code easier to follow.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-03-04 11:23:49 +02:00
parent ba7d8515c1
commit 45eb768c70
3 changed files with 22 additions and 19 deletions
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8
hw/pci/pci.c
View File

@ -668,13 +668,7 @@ static void pci_init_mask_bridge(PCIDevice *d)
pci_word_test_and_set_mask(d->config + PCI_PREF_MEMORY_LIMIT,
PCI_PREF_RANGE_TYPE_64);
/* TODO: add this define to pci_regs.h in linux and then in qemu. */
#define PCI_BRIDGE_CTL_VGA_16BIT 0x10 /* VGA 16-bit decode */
#define PCI_BRIDGE_CTL_DISCARD 0x100 /* Primary discard timer */
#define PCI_BRIDGE_CTL_SEC_DISCARD 0x200 /* Secondary discard timer */
#define PCI_BRIDGE_CTL_DISCARD_STATUS 0x400 /* Discard timer status */
#define PCI_BRIDGE_CTL_DISCARD_SERR 0x800 /* Discard timer SERR# enable */
/*
/*
* TODO: Bridges default to 10-bit VGA decoding but we currently only
* implement 16-bit decoding (no alias support).
*/

7
hw/pci/pci_bridge.h
View File

@ -55,6 +55,13 @@ void pci_bridge_exitfn(PCIDevice *pci_dev);
void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,
pci_map_irq_fn map_irq);
/* TODO: add this define to pci_regs.h in linux and then in qemu. */
#define PCI_BRIDGE_CTL_VGA_16BIT 0x10 /* VGA 16-bit decode */
#define PCI_BRIDGE_CTL_DISCARD 0x100 /* Primary discard timer */
#define PCI_BRIDGE_CTL_SEC_DISCARD 0x200 /* Secondary discard timer */
#define PCI_BRIDGE_CTL_DISCARD_STATUS 0x400 /* Discard timer status */
#define PCI_BRIDGE_CTL_DISCARD_SERR 0x800 /* Discard timer SERR# enable */
#endif /* QEMU_PCI_BRIDGE_H */
/*
* Local variables:

20
hw/pci/pcie_port.c
View File

@ -27,15 +27,17 @@ void pcie_port_init_reg(PCIDevice *d)
pci_set_word(d->config + PCI_STATUS, 0);
pci_set_word(d->config + PCI_SEC_STATUS, 0);
/* Unlike conventional pci bridge, some bits are hardwired to 0. */
#define PCI_BRIDGE_CTL_VGA_16BIT 0x10 /* VGA 16-bit decode */
pci_set_word(d->wmask + PCI_BRIDGE_CONTROL,
PCI_BRIDGE_CTL_PARITY |
PCI_BRIDGE_CTL_ISA |
PCI_BRIDGE_CTL_VGA |
PCI_BRIDGE_CTL_VGA_16BIT | /* Req, but no alias support yet */
PCI_BRIDGE_CTL_SERR |
PCI_BRIDGE_CTL_BUS_RESET);
/*
* Unlike conventional pci bridge, for some bits the spec states:
* Does not apply to PCI Express and must be hardwired to 0.
*/
pci_word_test_and_clear_mask(d->wmask + PCI_BRIDGE_CONTROL,
PCI_BRIDGE_CTL_MASTER_ABORT |
PCI_BRIDGE_CTL_FAST_BACK |
PCI_BRIDGE_CTL_DISCARD |
PCI_BRIDGE_CTL_SEC_DISCARD |
PCI_BRIDGE_CTL_DISCARD_STATUS |
PCI_BRIDGE_CTL_DISCARD_SERR);
}
/**************************************************************************