refactor: one more step towards arch-agnostic design

[lunaix-os.git] / lunaix-os / arch / i386 / hal / pci_hba.c

diff --git a/lunaix-os/arch/i386/hal/pci_hba.c b/lunaix-os/arch/i386/hal/pci_hba.c
new file mode 100644 (file)
index 0000000..60e3db8
--- /dev/null
+++ b/lunaix-os/arch/i386/hal/pci_hba.c
@@ -0,0 +1,32 @@
+#include <sys/apic.h>
+#include <sys/pci_hba.h>
+
+void
+pci_setup_msi(struct pci_device* device, int vector)
+{
+    // Dest: APIC#0, Physical Destination, No redirection
+    u32_t msi_addr = (__APIC_BASE_PADDR);
+
+    // Edge trigger, Fixed delivery
+    u32_t msi_data = vector;
+
+    pci_write_cspace(
+      device->cspace_base, PCI_MSI_ADDR(device->msi_loc), msi_addr);
+
+    pci_reg_t reg1 = pci_read_cspace(device->cspace_base, device->msi_loc);
+    pci_reg_t msg_ctl = reg1 >> 16;
+
+    int offset = !!(msg_ctl & MSI_CAP_64BIT) * 4;
+    pci_write_cspace(device->cspace_base,
+                     PCI_MSI_DATA(device->msi_loc, offset),
+                     msi_data & 0xffff);
+
+    if ((msg_ctl & MSI_CAP_MASK)) {
+        pci_write_cspace(
+          device->cspace_base, PCI_MSI_MASK(device->msi_loc, offset), 0);
+    }
+
+    // manipulate the MSI_CTRL to allow device using MSI to request service.
+    reg1 = (reg1 & 0xff8fffff) | 0x10000;
+    pci_write_cspace(device->cspace_base, device->msi_loc, reg1);
+}
\ No newline at end of file