Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / seabios / src / biosvar.h

diff --git a/qemu/roms/seabios/src/biosvar.h b/qemu/roms/seabios/src/biosvar.h
new file mode 100644 (file)
index 0000000..58bcbce
--- /dev/null
+++ b/qemu/roms/seabios/src/biosvar.h
@@ -0,0 +1,130 @@
+// Memory access to BIOS variables.
+//
+// Copyright (C) 2008-2013  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+#ifndef __BIOSVAR_H
+#define __BIOSVAR_H
+
+#include "config.h" // SEG_BDA
+#include "farptr.h" // GET_FARVAR
+#include "std/bda.h" // struct bios_data_area_s
+
+
+/****************************************************************
+ * Interupt vector table
+ ****************************************************************/
+
+#define GET_IVT(vector)                                         \
+    GET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector])
+#define SET_IVT(vector, segoff)                                         \
+    SET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector], segoff)
+
+#define FUNC16(func) ({                                 \
+        ASSERT32FLAT();                                 \
+        extern void func (void);                        \
+        SEGOFF(SEG_BIOS, (u32)func - BUILD_BIOS_ADDR);  \
+    })
+
+
+/****************************************************************
+ * Bios Data Area (BDA)
+ ****************************************************************/
+
+// Accessor functions
+#define GET_BDA(var) \
+    GET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var)
+#define SET_BDA(var, val) \
+    SET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var, (val))
+
+// Helper function to set the bits of the equipment_list_flags variable.
+static inline void set_equipment_flags(u16 clear, u16 set) {
+    u16 eqf = GET_BDA(equipment_list_flags);
+    SET_BDA(equipment_list_flags, (eqf & ~clear) | set);
+}
+
+
+/****************************************************************
+ * Extended Bios Data Area (EBDA)
+ ****************************************************************/
+
+// The initial size and location of EBDA
+#define EBDA_SIZE_START \
+    DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024)
+#define EBDA_SEGMENT_START \
+    FLATPTR_TO_SEG(BUILD_LOWRAM_END - EBDA_SIZE_START*1024)
+
+// Accessor functions
+static inline u16 get_ebda_seg(void) {
+    return GET_BDA(ebda_seg);
+}
+static inline struct extended_bios_data_area_s *
+get_ebda_ptr(void)
+{
+    ASSERT32FLAT();
+    return MAKE_FLATPTR(get_ebda_seg(), 0);
+}
+#define GET_EBDA(eseg, var)                                             \
+    GET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var)
+#define SET_EBDA(eseg, var, val)                                        \
+    SET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var, (val))
+
+
+/****************************************************************
+ * Global variables
+ ****************************************************************/
+
+#if MODE16 == 0 && MODESEGMENT == 1
+// In 32bit segmented mode %cs may not be readable and the code may be
+// relocated.  The entry code sets up %gs with a readable segment and
+// the code offset can be determined by get_global_offset().
+#define GLOBAL_SEGREG GS
+static inline u32 __attribute_const get_global_offset(void) {
+    u32 ret;
+    asm("  calll 1f\n"
+        "1:popl %0\n"
+        "  subl $1b, %0"
+        : "=r"(ret));
+    return ret;
+}
+#else
+#define GLOBAL_SEGREG CS
+static inline u32 __attribute_const get_global_offset(void) {
+    return 0;
+}
+#endif
+static inline u16 get_global_seg(void) {
+    return GET_SEG(GLOBAL_SEGREG);
+}
+#define GET_GLOBAL(var)                                                 \
+    GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var)              \
+                                             + get_global_offset()))
+#if MODESEGMENT
+#define GLOBALFLAT2GLOBAL(var) ((typeof(var))((void*)(var) - BUILD_BIOS_ADDR))
+#else
+#define GLOBALFLAT2GLOBAL(var) (var)
+#endif
+// Access a "flat" pointer known to point to the f-segment.
+#define GET_GLOBALFLAT(var) GET_GLOBAL(*GLOBALFLAT2GLOBAL(&(var)))
+
+
+/****************************************************************
+ * "Low" memory variables
+ ****************************************************************/
+
+extern u8 _zonelow_seg, zonelow_base[];
+#define SEG_LOW ((u32)&_zonelow_seg)
+
+#if MODESEGMENT
+#define GET_LOW(var)            GET_FARVAR(SEG_LOW, (var))
+#define SET_LOW(var, val)       SET_FARVAR(SEG_LOW, (var), (val))
+#define LOWFLAT2LOW(var) ((typeof(var))((void*)(var) - (u32)zonelow_base))
+#else
+#define GET_LOW(var)            (var)
+#define SET_LOW(var, val)       do { (var) = (val); } while (0)
+#define LOWFLAT2LOW(var) (var)
+#endif
+#define GET_LOWFLAT(var) GET_LOW(*LOWFLAT2LOW(&(var)))
+#define SET_LOWFLAT(var, val) SET_LOW(*LOWFLAT2LOW(&(var)), (val))
+
+#endif // __BIOSVAR_H