From 92ba5f51c305911cbfc0fcff9f259b0604681222 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Wed, 15 Sep 2010 14:38:15 +0900 Subject: [PATCH] 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 Signed-off-by: Michael S. Tsirkin --- hw/pci.c | 5 +++++ hw/pci.h | 3 +++ 2 files changed, 8 insertions(+) diff --git a/hw/pci.c b/hw/pci.c index 97a7b232ac..abddc6d239 100644 --- a/hw/pci.c +++ b/hw/pci.c @@ -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) || diff --git a/hw/pci.h b/hw/pci.h index 1c6075eb40..d8b399f4d5 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -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;