[Qemu-devel] [PATCH v3 03/13] pci: introduce helper function pci_shift_word/long which returns shifted value.

[Isaku Yamahata]

introduce helper function pci_shift_{word, long}() which returns
returns shifted word/long of given position and range.
They will be used later.

Signed-off-by: Isaku Yamahata <address@hidden>
---
 hw/pci.h |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/hw/pci.h b/hw/pci.h
index f4ea97a..630631b 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -327,6 +327,25 @@ pci_config_set_interrupt_pin(uint8_t *pci_config, uint8_t 
val)
     pci_set_byte(&pci_config[PCI_INTERRUPT_PIN], val);
 }
 
+static inline uint32_t
+pci_shift_long(uint32_t addr, uint32_t val, uint32_t pos)
+{
+    if (addr >= pos) {
+        assert(addr - pos <= 32 / 8);
+        val <<= (addr - pos) * 8;
+    } else {
+        assert(pos - addr <= 32 / 8);
+        val >>= (pos - addr) * 8;
+    }
+    return val;
+}
+
+static inline uint16_t
+pci_shift_word(uint32_t addr, uint32_t val, uint32_t pos)
+{
+    return pci_shift_long(addr, val, pos);
+}
+
 typedef int (*pci_qdev_initfn)(PCIDevice *dev);
 typedef struct {
     DeviceInfo qdev;
-- 
1.7.1.1