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| author | Michael S. Tsirkin <mst@redhat.com> | 2012-02-21 15:41:30 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2012-02-22 09:02:18 -0600 |
| commit | c9f50cea70a15967daec9bf48fed37eafefdd584 (patch) | |
| tree | 3d14f1e549df1454dcaf6eab695e40c3387d4fb3 /hw/pci.c | |
| parent | 358b54654aa85f97402aca4be3b1a7b7d08bab70 (diff) | |
pci: add accessors to get/set registers by mask
pci_regs.h specifies many registers by mask +
shifted register values.
There's always some duplication when using such:
for example to override device type, we would need:
pci_word_test_and_clear_mask(cap + PCI_EXP_FLAGS,
PCI_EXP_FLAGS_TYPE);
pci_word_test_and_set_mask(cap + PCI_EXP_FLAGS,
PCI_EXP_TYPE_ENDPOINT << (ffs(PCI_EXP_FLAGS_TYPE) - 1));
Getting such registers also uses some duplication:
word = pci_get_word(cap + PCI_EXP_FLAGS) & PCI_EXP_FLAGS_TYPE;
if ((word >> ffs((PCI_EXP_FLAGS_TYPE) - 1)) == PCI_EXP_TYPE_ENDPOINT)
Add API to access such registers in one line:
pci_set_word_by_mask(cap + PCI_EXP_FLAGS, PCI_EXP_FLAGS_TYPE,
PCI_EXP_TYPE_ENDPOINT)
and
word = pci_get_word_by_mask(cap + PCI_EXP_FLAGS, PCI_EXP_FLAGS_TYPE)
if (word == PCI_EXP_TYPE_ENDPOINT)
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/pci.c')
0 files changed, 0 insertions, 0 deletions