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pci: implement RW1C register framework. 

Implement RW1C register framework.
With this patch, it would be easy to implement
W1C(Write 1 to Clear) register by just setting w1cmask.
Later RW1C register will be used by pcie.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Isaku Yamahata 2010-09-15 14:38:15 +09:00 committed by Michael S. Tsirkin
parent 0bb750ef9e
commit 92ba5f51c3
2 changed files with 8 additions and 0 deletions
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5
hw/pci.c
View File

@ -627,6 +627,7 @@ static void pci_config_alloc(PCIDevice *pci_dev)
pci_dev->config = qemu_mallocz(config_size);
pci_dev->cmask = qemu_mallocz(config_size);
pci_dev->wmask = qemu_mallocz(config_size);
pci_dev->w1cmask = qemu_mallocz(config_size);
pci_dev->used = qemu_mallocz(config_size);
}
@ -635,6 +636,7 @@ static void pci_config_free(PCIDevice *pci_dev)
qemu_free(pci_dev->config);
qemu_free(pci_dev->cmask);
qemu_free(pci_dev->wmask);
qemu_free(pci_dev->w1cmask);
qemu_free(pci_dev->used);
}
@ -997,7 +999,10 @@ void pci_default_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
for (i = 0; i < l && addr + i < config_size; val >>= 8, ++i) {
uint8_t wmask = d->wmask[addr + i];
uint8_t w1cmask = d->w1cmask[addr + i];
assert(!(wmask & w1cmask));
d->config[addr + i] = (d->config[addr + i] & ~wmask) | (val & wmask);
d->config[addr + i] &= ~(val & w1cmask); /* W1C: Write 1 to Clear */
}
if (ranges_overlap(addr, l, PCI_BASE_ADDRESS_0, 24) ||
ranges_overlap(addr, l, PCI_ROM_ADDRESS, 4) ||

3
hw/pci.h
View File

@ -129,6 +129,9 @@ struct PCIDevice {
/* Used to implement R/W bytes */
uint8_t *wmask;
/* Used to implement RW1C(Write 1 to Clear) bytes */
uint8_t *w1cmask;
/* Used to allocate config space for capabilities. */
uint8_t *used;