1 files changed, 123 insertions, 0 deletions
diff --git a/hw/mac_nvram.c b/hw/mac_nvram.c
new file mode 100644
index 0000000000..f8b8d3755e
--- /dev/null
+++ b/hw/mac_nvram.c
@@ -0,0 +1,123 @@
+/*
+ * PowerMac NVRAM emulation
+ *
+ * Copyright (c) 2005-2007 Fabrice Bellard
+ * Copyright (c) 2007 Jocelyn Mayer
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+#include "ppc_mac.h"
+
+struct MacIONVRAMState {
+    uint8_t data[0x2000];
+};
+
+/* Direct access to NVRAM */
+uint32_t macio_nvram_read (void *opaque, uint32_t addr)
+{
+    MacIONVRAMState *s = opaque;
+    uint32_t ret;
+
+    //    printf("%s: %p addr %04x\n", __func__, s, addr);
+    if (addr < 0x2000)
+        ret = s->data[addr];
+    else
+        ret = -1;
+
+    return ret;
+}
+
+void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
+{
+    MacIONVRAMState *s = opaque;
+
+    //    printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val);
+    if (addr < 0x2000)
+        s->data[addr] = val;
+}
+
+/* macio style NVRAM device */
+static void macio_nvram_writeb (void *opaque,
+                                target_phys_addr_t addr, uint32_t value)
+{
+    MacIONVRAMState *s = opaque;
+    addr = (addr >> 4) & 0x1fff;
+    s->data[addr] = value;
+    //    printf("macio_nvram_writeb %04x = %02x\n", addr, value);
+}
+
+static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
+{
+    MacIONVRAMState *s = opaque;
+    uint32_t value;
+
+    addr = (addr >> 4) & 0x1fff;
+    value = s->data[addr];
+    //    printf("macio_nvram_readb %04x = %02x\n", addr, value);
+
+    return value;
+}
+
+static CPUWriteMemoryFunc *nvram_write[] = {
+    &macio_nvram_writeb,
+    &macio_nvram_writeb,
+    &macio_nvram_writeb,
+};
+
+static CPUReadMemoryFunc *nvram_read[] = {
+    &macio_nvram_readb,
+    &macio_nvram_readb,
+    &macio_nvram_readb,
+};
+
+MacIONVRAMState *macio_nvram_init (int *mem_index)
+{
+    MacIONVRAMState *s;
+    s = qemu_mallocz(sizeof(MacIONVRAMState));
+    if (!s)
+        return NULL;
+    *mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
+
+    return s;
+}
+
+static uint8_t nvram_chksum (const uint8_t *buf, int n)
+{
+    int sum, i;
+    sum = 0;
+    for(i = 0; i < n; i++)
+        sum += buf[i];
+    return (sum & 0xff) + (sum >> 8);
+}
+
+/* set a free Mac OS NVRAM partition */
+void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
+{
+    uint8_t *buf;
+    char partition_name[12] = "wwwwwwwwwwww";
+
+    buf = nvr->data;
+    buf[0] = 0x7f; /* free partition magic */
+    buf[1] = 0; /* checksum */
+    buf[2] = len >> 8;
+    buf[3] = len;
+    memcpy(buf + 4, partition_name, 12);
+    buf[1] = nvram_chksum(buf, 16);
+}