AppleSMC device emulation

Intel Macs have a chip called the "AppleSMC" which they use to control
certain Apple specific parts of the hardware, like the keyboard background
light.

That chip is also used to store a key that Mac OS X uses to decrypt binaries.

This patch adds emulation for that chip, so we're getting one step further
to having Mac OS X run natively on Qemu.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

2 files changed, 242 insertions, 1 deletions

diff --git a/Makefile.target b/Makefile.target
index 7489910..3ef4666 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -192,7 +192,7 @@ obj-y += e1000.o
 obj-i386-y += vga.o
 obj-i386-y += mc146818rtc.o i8259.o pc.o
 obj-i386-y += cirrus_vga.o apic.o ioapic.o piix_pci.o
-obj-i386-y += vmmouse.o vmport.o hpet.o
+obj-i386-y += vmmouse.o vmport.o hpet.o applesmc.o
 obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
 obj-i386-y += debugcon.o multiboot.o
 obj-i386-y += pc_piix.o
diff --git a/hw/applesmc.c b/hw/applesmc.c
new file mode 100644
index 0000000..29b9330
--- /dev/null
+++ b/hw/applesmc.c
@@ -0,0 +1,241 @@
+/*
+ *  Apple SMC controller
+ *
+ *  Copyright (c) 2007 Alexander Graf
+ *
+ *  Authors: Alexander Graf <agraf@suse.de>
+ *           Susanne Graf <suse@csgraf.de>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * *****************************************************************
+ *
+ * In all Intel-based Apple hardware there is an SMC chip to control the
+ * backlight, fans and several other generic device parameters. It also
+ * contains the magic keys used to dongle Mac OS X to the device.
+ *
+ * This driver was mostly created by looking at the Linux AppleSMC driver
+ * implementation and does not support IRQ.
+ *
+ */
+
+#include "hw.h"
+#include "isa.h"
+#include "console.h"
+#include "qemu-timer.h"
+
+/* #define DEBUG_SMC */
+
+#define APPLESMC_DEFAULT_IOBASE        0x300
+/* data port used by Apple SMC */
+#define APPLESMC_DATA_PORT             0x0
+/* command/status port used by Apple SMC */
+#define APPLESMC_CMD_PORT              0x4
+#define APPLESMC_NR_PORTS              32
+#define APPLESMC_MAX_DATA_LENGTH       32
+
+#define APPLESMC_READ_CMD              0x10
+#define APPLESMC_WRITE_CMD             0x11
+#define APPLESMC_GET_KEY_BY_INDEX_CMD  0x12
+#define APPLESMC_GET_KEY_TYPE_CMD      0x13
+
+#ifdef DEBUG_SMC
+#define smc_debug(...) fprintf(stderr, "AppleSMC: " __VA_ARGS__)
+#else
+#define smc_debug(...) do { } while(0)
+#endif
+
+static char default_osk[64] = "This is a dummy key. Enter the real key "
+                              "using the -osk parameter";
+
+struct AppleSMCData {
+    uint8_t len;
+    const char *key;
+    const char *data;
+    QLIST_ENTRY(AppleSMCData) node;
+};
+
+struct AppleSMCStatus {
+    ISADevice dev;
+    uint32_t iobase;
+    uint8_t cmd;
+    uint8_t status;
+    uint8_t key[4];
+    uint8_t read_pos;
+    uint8_t data_len;
+    uint8_t data_pos;
+    uint8_t data[255];
+    uint8_t charactic[4];
+    char *osk;
+    QLIST_HEAD(, AppleSMCData) data_def;
+};
+
+static void applesmc_io_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)
+{
+    struct AppleSMCStatus *s = opaque;
+
+    smc_debug("CMD Write B: %#x = %#x\n", addr, val);
+    switch(val) {
+        case APPLESMC_READ_CMD:
+            s->status = 0x0c;
+            break;
+    }
+    s->cmd = val;
+    s->read_pos = 0;
+    s->data_pos = 0;
+}
+
+static void applesmc_fill_data(struct AppleSMCStatus *s)
+{
+    struct AppleSMCData *d;
+
+    QLIST_FOREACH(d, &s->data_def, node) {
+        if (!memcmp(d->key, s->key, 4)) {
+            smc_debug("Key matched (%s Len=%d Data=%s)\n", d->key,
+                      d->len, d->data);
+            memcpy(s->data, d->data, d->len);
+            return;
+        }
+    }
+}
+
+static void applesmc_io_data_writeb(void *opaque, uint32_t addr, uint32_t val)
+{
+    struct AppleSMCStatus *s = opaque;
+
+    smc_debug("DATA Write B: %#x = %#x\n", addr, val);
+    switch(s->cmd) {
+        case APPLESMC_READ_CMD:
+            if(s->read_pos < 4) {
+                s->key[s->read_pos] = val;
+                s->status = 0x04;
+            } else if(s->read_pos == 4) {
+                s->data_len = val;
+                s->status = 0x05;
+                s->data_pos = 0;
+                smc_debug("Key = %c%c%c%c Len = %d\n", s->key[0],
+                          s->key[1], s->key[2], s->key[3], val);
+                applesmc_fill_data(s);
+            }
+            s->read_pos++;
+            break;
+    }
+}
+
+static uint32_t applesmc_io_data_readb(void *opaque, uint32_t addr1)
+{
+    struct AppleSMCStatus *s = opaque;
+    uint8_t retval = 0;
+
+    switch(s->cmd) {
+        case APPLESMC_READ_CMD:
+            if(s->data_pos < s->data_len) {
+                retval = s->data[s->data_pos];
+                smc_debug("READ_DATA[%d] = %#hhx\n", s->data_pos,
+                          retval);
+                s->data_pos++;
+                if(s->data_pos == s->data_len) {
+                    s->status = 0x00;
+                    smc_debug("EOF\n");
+                } else
+                    s->status = 0x05;
+            }
+    }
+    smc_debug("DATA Read b: %#x = %#x\n", addr1, retval);
+
+    return retval;
+}
+
+static uint32_t applesmc_io_cmd_readb(void *opaque, uint32_t addr1)
+{
+    struct AppleSMCStatus *s = opaque;
+
+    smc_debug("CMD Read B: %#x\n", addr1);
+    return s->status;
+}
+
+static void applesmc_add_key(struct AppleSMCStatus *s, const char *key,
+                             int len, const char *data)
+{
+    struct AppleSMCData *def;
+
+    def = qemu_mallocz(sizeof(struct AppleSMCData));
+    def->key = key;
+    def->len = len;
+    def->data = data;
+
+    QLIST_INSERT_HEAD(&s->data_def, def, node);
+}
+
+static void qdev_applesmc_isa_reset(DeviceState *dev)
+{
+    struct AppleSMCStatus *s = DO_UPCAST(struct AppleSMCStatus, dev.qdev, dev);
+    struct AppleSMCData *d, *next;
+
+    /* Remove existing entries */
+    QLIST_FOREACH_SAFE(d, &s->data_def, node, next) {
+        QLIST_REMOVE(d, node);
+    }
+
+    applesmc_add_key(s, "REV ", 6, "\0x01\0x13\0x0f\0x00\0x00\0x03");
+    applesmc_add_key(s, "OSK0", 32, s->osk);
+    applesmc_add_key(s, "OSK1", 32, s->osk + 32);
+    applesmc_add_key(s, "NATJ", 1, "\0");
+    applesmc_add_key(s, "MSSP", 1, "\0");
+    applesmc_add_key(s, "MSSD", 1, "\0x3");
+}
+
+static int applesmc_isa_init(ISADevice *dev)
+{
+    struct AppleSMCStatus *s = DO_UPCAST(struct AppleSMCStatus, dev, dev);
+
+    register_ioport_read(s->iobase + APPLESMC_DATA_PORT, 4, 1,
+                         applesmc_io_data_readb, s);
+    register_ioport_read(s->iobase + APPLESMC_CMD_PORT, 4, 1,
+                         applesmc_io_cmd_readb, s);
+    register_ioport_write(s->iobase + APPLESMC_DATA_PORT, 4, 1,
+                          applesmc_io_data_writeb, s);
+    register_ioport_write(s->iobase + APPLESMC_CMD_PORT, 4, 1,
+                          applesmc_io_cmd_writeb, s);
+
+    if (!s->osk || (strlen(s->osk) != 64)) {
+        fprintf(stderr, "WARNING: Using AppleSMC with invalid key\n");
+        s->osk = default_osk;
+    }
+
+    QLIST_INIT(&s->data_def);
+    qdev_applesmc_isa_reset(&dev->qdev);
+
+    return 0;
+}
+
+static ISADeviceInfo applesmc_isa_info = {
+    .qdev.name  = "isa-applesmc",
+    .qdev.size  = sizeof(struct AppleSMCStatus),
+    .qdev.reset = qdev_applesmc_isa_reset,
+    .init       = applesmc_isa_init,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_HEX32("iobase", struct AppleSMCStatus, iobase,
+                          APPLESMC_DEFAULT_IOBASE),
+        DEFINE_PROP_STRING("osk", struct AppleSMCStatus, osk),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void applesmc_register_devices(void)
+{
+    isa_qdev_register(&applesmc_isa_info);
+}
+
+device_init(applesmc_register_devices)