From 61b347a766d9e2f85fcbca96b535b9fdffe7fe8b Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 26 Jul 2010 17:04:12 -0400
Subject: [PATCH 2/7] Add the "route80h.efi" test program.

This is a test program for PciIo.  It routes port80h on ICH10 to PCI.
---
 apps/Makefile   |    2 +-
 apps/route80h.c |  125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 apps/route80h.c

diff --git a/apps/Makefile b/apps/Makefile
index 1e43821..6bda7ea 100644
--- a/apps/Makefile
+++ b/apps/Makefile
@@ -58,7 +58,7 @@ LDFLAGS		+= -T $(LDSCRIPT) -shared -Bsymbolic -L../lib -L../gnuefi $(CRTOBJS)
 LOADLIBES	= -lefi -lgnuefi $(shell $(CC) $(ARCH3264) -print-libgcc-file-name)
 FORMAT		= efi-app-$(ARCH)
 
-TARGETS = t.efi t2.efi t3.efi t4.efi t5.efi t6.efi printenv.efi t7.efi tcc.efi
+TARGETS = t.efi t2.efi t3.efi t4.efi t5.efi t6.efi printenv.efi t7.efi tcc.efi route80h.efi
 
 all:	$(TARGETS)
 
diff --git a/apps/route80h.c b/apps/route80h.c
new file mode 100644
index 0000000..1a04b5a
--- /dev/null
+++ b/apps/route80h.c
@@ -0,0 +1,125 @@
+#include <efi.h>
+#include <efilib.h>
+
+/* this example program changes the Reserved Page Route (RPR) bit on ICH10's General
+ * Control And Status Register (GCS) from LPC to PCI.  In practical terms, it routes
+ * outb to port 80h to the PCI bus. */
+
+#define GCS_OFFSET_ADDR 0x3410
+#define GCS_RPR_SHIFT 2
+#define GCS_RPR_PCI 1
+#define GCS_RPR_LPC 0
+
+#define VENDOR_ID_INTEL 0x8086
+#define DEVICE_ID_LPCIF 0x3a16
+
+static EFI_HANDLE ImageHandle;
+
+typedef struct {
+	uint16_t vendor_id;	/* 00-01 */
+	uint16_t device_id;	/* 02-03 */
+	char pad[0xEB];		/* 04-EF */
+	uint32_t rcba;		/* F0-F3 */
+	uint32_t reserved[3];	/* F4-FF */
+} lpcif_t;
+
+static inline void set_bit(volatile uint32_t *flag, int bit, int value)
+{
+	uint32_t val = *flag;
+	Print(L"current value is 0x%2x\n", val);
+
+	if (value) {
+		val |= (1 << bit);
+	} else {
+		val &= ~(1 << bit);
+	}
+	Print(L"setting value to 0x%2x\n", val);
+	*flag = val;
+	val = *flag;
+	Print(L"new value is 0x%2x\n", val);
+}
+
+static inline int configspace_matches_ids(void *config, uint32_t vendor_id,
+				uint32_t device_id)
+{
+	uint32_t *cfg = config;
+	if (cfg[0] == vendor_id && cfg[1] == device_id)
+		return 1;
+	return 0;
+}
+
+static int is_device(EFI_PCI_IO *pciio, uint16_t vendor_id, uint16_t device_id)
+{
+	lpcif_t lpcif;
+	EFI_STATUS rc;
+
+	rc = uefi_call_wrapper(pciio->Pci.Read, 5, pciio, EfiPciIoWidthUint16, 0, 2, &lpcif);
+	if (EFI_ERROR(rc))
+		return 0;
+
+	if (vendor_id == lpcif.vendor_id && device_id == lpcif.device_id)
+		return 1;
+	return 0;
+}
+
+static EFI_STATUS find_pci_device(uint16_t vendor_id, uint16_t device_id,
+				EFI_PCI_IO **pciio)
+{
+	EFI_STATUS rc;
+	EFI_HANDLE *Handles;
+	UINTN NoHandles;
+	int i;
+
+	rc = LibLocateHandle(ByProtocol, &PciIoProtocol, NULL, &NoHandles,
+			     &Handles);
+	if (EFI_ERROR(rc))
+		return rc;
+
+	for (i = 0; i < NoHandles; i++) {
+		rc = uefi_call_wrapper(BS->OpenProtocol, 6, Handles[i],
+				    &PciIoProtocol, pciio, ImageHandle,
+				    NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+		if (EFI_ERROR(rc))
+			continue;
+		if (!is_device(*pciio, vendor_id, device_id))
+			continue;
+
+		return EFI_SUCCESS;
+	}
+	return EFI_NOT_FOUND;
+}
+
+EFI_STATUS
+efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab)
+{
+	InitializeLib(image_handle, systab);
+	EFI_PCI_IO *pciio;
+	lpcif_t lpcif;
+	EFI_STATUS rc;
+
+	ImageHandle = image_handle;
+	rc = find_pci_device(VENDOR_ID_INTEL, DEVICE_ID_LPCIF, &pciio);
+
+	if (rc == EFI_NOT_FOUND) {
+		Print(L"Device not found.\n");
+		return rc;
+	} else if (EFI_ERROR(rc)) {
+		return rc;
+	}
+
+	rc = uefi_call_wrapper(pciio->Pci.Read, 5, pciio, EfiPciIoWidthUint32,
+		EFI_FIELD_OFFSET(lpcif_t, rcba), 1, &lpcif.rcba);
+	if (EFI_ERROR(rc))
+		return rc;
+	if (!(lpcif.rcba & 1)) {
+		Print(L"rcrb is not mapped, cannot route port 80h\n");
+		return EFI_UNSUPPORTED;
+	}
+	lpcif.rcba &= ~1UL;
+
+	Print(L"rcba: 0x%8x\n", lpcif.rcba, lpcif.rcba);
+	set_bit((uint32_t *)(lpcif.rcba + GCS_OFFSET_ADDR),
+		     GCS_RPR_SHIFT, GCS_RPR_PCI);
+
+	return EFI_SUCCESS;
+}
-- 
1.7.10.4