Software MMU support (used for memory mapped devices such as VGA)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@347 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 111 insertions, 0 deletions

diff --git a/softmmu_header.h b/softmmu_header.h
new file mode 100644
index 0000000000..12306a6667
--- /dev/null
+++ b/softmmu_header.h
@@ -0,0 +1,111 @@
+/*
+ *  Software MMU support
+ * 
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#if DATA_SIZE == 8
+#define SUFFIX q
+#define DATA_TYPE uint64_t
+#elif DATA_SIZE == 4
+#define SUFFIX l
+#define DATA_TYPE uint32_t
+#elif DATA_SIZE == 2
+#define SUFFIX w
+#define DATA_TYPE uint16_t
+#define DATA_STYPE int16_t
+#elif DATA_SIZE == 1
+#define SUFFIX b
+#define DATA_TYPE uint8_t
+#define DATA_STYPE int8_t
+#else
+#error unsupported data size
+#endif
+
+#if MEMUSER == 0
+#define MEMSUFFIX _kernel
+#else
+#define MEMSUFFIX _user
+#endif
+
+#if DATA_SIZE == 8
+#define RES_TYPE uint64_t
+#else
+#define RES_TYPE int
+#endif
+
+
+#if MEMUSER == 0
+DATA_TYPE __attribute((regparm(1))) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr);
+void __attribute((regparm(2))) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE v);
+#endif
+
+static inline int glue(glue(ldu, SUFFIX), MEMSUFFIX)(void *ptr)
+{
+    int index;
+    RES_TYPE res;
+    unsigned long addr, physaddr;
+    addr = (unsigned long)ptr;
+    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
+    if (__builtin_expect(env->tlb_read[MEMUSER][index].address != 
+                         (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
+        res = glue(glue(__ld, SUFFIX), _mmu)(addr);
+    } else {
+        physaddr = addr + env->tlb_read[MEMUSER][index].addend;
+        res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
+    }
+    return res;
+}
+
+#if DATA_SIZE <= 2
+static inline int glue(glue(lds, SUFFIX), MEMSUFFIX)(void *ptr)
+{
+    int res, index;
+    unsigned long addr, physaddr;
+    addr = (unsigned long)ptr;
+    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
+    if (__builtin_expect(env->tlb_read[MEMUSER][index].address != 
+                         (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
+        res = (DATA_STYPE)glue(glue(__ld, SUFFIX), _mmu)(addr);
+    } else {
+        physaddr = addr + env->tlb_read[MEMUSER][index].addend;
+        res = glue(glue(lds, SUFFIX), _raw)((uint8_t *)physaddr);
+    }
+    return res;
+}
+#endif
+
+static inline void glue(glue(st, SUFFIX), MEMSUFFIX)(void *ptr, RES_TYPE v)
+{
+    int index;
+    unsigned long addr, physaddr;
+    addr = (unsigned long)ptr;
+    index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
+    if (__builtin_expect(env->tlb_write[MEMUSER][index].address != 
+                         (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))), 0)) {
+        glue(glue(__st, SUFFIX), _mmu)(addr, v);
+    } else {
+        physaddr = addr + env->tlb_write[MEMUSER][index].addend;
+        glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, v);
+    }
+}
+
+#undef RES_TYPE
+#undef DATA_TYPE
+#undef DATA_STYPE
+#undef SUFFIX
+#undef DATA_SIZE
+#undef MEMSUFFIX