libqos: add fw_cfg support

fw_cfg is needed to get the top of memory which is necessary for
doing PCI allocation and allocating RAM for DMA.

Add a PC version of fw_cfg and enough abstraction to support other
platforms.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Message-id: 1366123521-4330-4-git-send-email-aliguori@us.ibm.com

tests/Makefile

@@ -116,8 +116,8 @@ tests/test-visitor-serialization$(EXESUF): tests/test-visitor-serialization.o $(
 
 tests/test-mul64$(EXESUF): tests/test-mul64.o libqemuutil.a
 
-libqos-obj-y = tests/libqos/pci.o
-libqos-pc-obj-y = $(libqos-obj-y) tests/libqos/pci-pc.o
+libqos-obj-y = tests/libqos/pci.o tests/libqos/fw_cfg.o
+libqos-pc-obj-y = $(libqos-obj-y) tests/libqos/pci-pc.o tests/libqos/fw_cfg-pc.o
 
 tests/rtc-test$(EXESUF): tests/rtc-test.o
 tests/m48t59-test$(EXESUF): tests/m48t59-test.o

tests/libqos/fw_cfg-pc.c

@@ -0,0 +1,40 @@
+/*
+ * libqos fw_cfg support for PC
+ *
+ * Copyright IBM, Corp. 2012-2013
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "libqos/fw_cfg-pc.h"
+#include "libqtest.h"
+#include <glib.h>
+
+static void pc_fw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
+{
+    outw(0x510, key);
+}
+
+static void pc_fw_cfg_read(QFWCFG *fw_cfg, void *data, size_t len)
+{
+    uint8_t *ptr = data;
+    int i;
+
+    for (i = 0; i < len; i++) {
+        ptr[i] = inb(0x511);
+    }
+}
+
+QFWCFG *pc_fw_cfg_init(void)
+{
+    QFWCFG *fw_cfg = g_malloc0(sizeof(*fw_cfg));
+
+    fw_cfg->select = pc_fw_cfg_select;
+    fw_cfg->read = pc_fw_cfg_read;
+
+    return fw_cfg;
+}

tests/libqos/fw_cfg-pc.h

@@ -0,0 +1,20 @@
+/*
+ * libqos fw_cfg support for PC
+ *
+ * Copyright IBM, Corp. 2012-2013
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef LIBQOS_FW_CFG_PC_H
+#define LIBQOS_FW_CFG_PC_H
+
+#include "libqos/fw_cfg.h"
+
+QFWCFG *pc_fw_cfg_init(void);
+
+#endif

tests/libqos/fw_cfg.c

@@ -0,0 +1,51 @@
+/*
+ * libqos fw_cfg support
+ *
+ * Copyright IBM, Corp. 2012-2013
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "libqos/fw_cfg.h"
+
+void qfw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
+{
+    fw_cfg->select(fw_cfg, key);
+}
+
+void qfw_cfg_read_data(QFWCFG *fw_cfg, void *data, size_t len)
+{
+    fw_cfg->read(fw_cfg, data, len);
+}
+
+void qfw_cfg_get(QFWCFG *fw_cfg, uint16_t key, void *data, size_t len)
+{
+    qfw_cfg_select(fw_cfg, key);
+    qfw_cfg_read_data(fw_cfg, data, len);
+}
+
+uint16_t qfw_cfg_get_u16(QFWCFG *fw_cfg, uint16_t key)
+{
+    uint16_t value;
+    qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
+    return value;
+}
+
+uint32_t qfw_cfg_get_u32(QFWCFG *fw_cfg, uint16_t key)
+{
+    uint32_t value;
+    qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
+    return value;
+}
+
+uint64_t qfw_cfg_get_u64(QFWCFG *fw_cfg, uint16_t key)
+{
+    uint64_t value;
+    qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
+    return value;
+}
+

tests/libqos/fw_cfg.h

@@ -0,0 +1,34 @@
+/*
+ * libqos fw_cfg support
+ *
+ * Copyright IBM, Corp. 2012-2013
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef LIBQOS_FW_CFG_H
+#define LIBQOS_FW_CFG_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+typedef struct QFWCFG QFWCFG;
+
+struct QFWCFG
+{
+    void (*select)(QFWCFG *fw_cfg, uint16_t key);
+    void (*read)(QFWCFG *fw_cfg, void *data, size_t len);
+};
+
+void qfw_cfg_select(QFWCFG *fw_cfg, uint16_t key);
+void qfw_cfg_read_data(QFWCFG *fw_cfg, void *data, size_t len);
+void qfw_cfg_get(QFWCFG *fw_cfg, uint16_t key, void *data, size_t len);
+uint16_t qfw_cfg_get_u16(QFWCFG *fw_cfg, uint16_t key);
+uint32_t qfw_cfg_get_u32(QFWCFG *fw_cfg, uint16_t key);
+uint64_t qfw_cfg_get_u64(QFWCFG *fw_cfg, uint16_t key);
+
+#endif