Make the device tree available in the rom stage

We thought about two ways to do this change. The way we decided to try
was to
1. drop all ops from devices in romstage
2. constify all devices in romstage (make them read-only) so we can
   compile static.c into romstage
3. the device tree "devices" can be used to read configuration from
   the device tree (and nothing else, really)
4. the device tree devices are accessed through struct device * in
   romstage only. device_t stays the typedef to int in romstage
5. Use the same static.c file in ramstage and romstage

We declare structs as follows:
ROMSTAGE_CONST struct bus dev_root_links[];
ROMSTAGE_CONST is const in romstage and empty in ramstage; This
forces all of the device tree into the text area.

So a struct looks like this:
static ROMSTAGE_CONST struct device _dev21 = {
 #ifndef __PRE_RAM__
        .ops = 0,
 #endif
        .bus = &_dev7_links[0],
        .path = {.type=DEVICE_PATH_PCI,{.pci={ .devfn = PCI_DEVFN(0x1c,3)}}},
        .enabled = 0,
        .on_mainboard = 1,
        .subsystem_vendor = 0x1ae0,
        .subsystem_device = 0xc000,
        .link_list = NULL,
        .sibling = &_dev22,
 #ifndef __PRE_RAM__
        .chip_ops = &southbridge_intel_bd82x6x_ops,
 #endif
        .chip_info = &southbridge_intel_bd82x6x_info_10,
        .next=&_dev22
};

Change-Id: I722454d8d3c40baf7df989f5a6891f6ba7db5727
Signed-off-by: Ronald G. Minnich <rminnich@chromium.org>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1398
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/include/device/pci.h b/src/include/device/pci.h
index 51d52835fd..a215a2a028 100644
--- a/src/include/device/pci.h
+++ b/src/include/device/pci.h
@@ -16,9 +16,11 @@
 #define PCI_H
 
 #include <stdint.h>
+#include <stddef.h>
 #include <device/pci_def.h>
 #include <device/resource.h>
 #include <device/device.h>
+#ifndef __PRE_RAM__
 #include <device/pci_ops.h>
 #include <device/pci_rom.h>
 
@@ -107,4 +109,5 @@ static inline const struct pci_bus_operations *ops_pci_bus(struct bus *bus)
 unsigned mainboard_pci_subsystem_vendor_id(struct device *dev);
 unsigned mainboard_pci_subsystem_device_id(struct device *dev);
 
+#endif
 #endif /* PCI_H */