1 files changed, 85 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/shared/realmode_int/realmode_int.h b/c/src/lib/libbsp/i386/shared/realmode_int/realmode_int.h
new file mode 100644
index 0000000000..e5f80d0555
--- /dev/null
+++ b/c/src/lib/libbsp/i386/shared/realmode_int/realmode_int.h
@@ -0,0 +1,85 @@
+/**
+ * @file realmode_int.h
+ *
+ * @ingroup i386_shared
+ *
+ * @brief Definitioins supporting real mode interrupt calls.
+ */
+
+/*
+ *  Interface allows calling given interrupt number with content of the
+ *  registers defined. For passing or receiving higher amounts of the data
+ *  there is a buffer accessible from real mode available. Real mode pointer
+ *  to this buffer is passed to the interrupt in the registers.
+ *
+ * Copyright (C) 2014  Jan Doležal (dolezj21@fel.cvut.cz)
+ *                     CTU in Prague.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _REALMODE_INT_H
+#define _REALMODE_INT_H
+
+#include <libcpu/cpu.h>
+#include <stdint.h>
+
+#ifndef ASM /* ASM */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* --- BIOS service interrupt number --- */
+/* number of interrupt servicing video functions */
+#define INTERRUPT_NO_VIDEO_SERVICES 0x10
+
+typedef struct { /* used for passing parameters, fetching results and preserving values */
+    uint32_t reg_eax;
+    uint32_t reg_ebx;
+    uint32_t reg_ecx;
+    uint32_t reg_edx;
+    uint32_t reg_esi;
+    uint32_t reg_edi;
+    uint16_t reg_ds;
+    uint16_t reg_es;
+    uint16_t reg_fs;
+    uint16_t reg_gs;
+} RTEMS_COMPILER_PACKED_ATTRIBUTE i386_realmode_interrupt_registers;
+
+/**
+ * Provides position to real mode buffer. It is buffer
+ * accessible from real mode context - it is located below
+ * address ~0x100000 in order for it to be accessible
+ * This buffer is meant to be pointed to by segReg:GenPurpReg
+ * and through this get bigger portion of an information to/from
+ * interrupt service routine than just by using register.
+ *
+ * @param size pointer to variable, where the size of buffer
+ *        will be filled
+ * @retval pointer to buffer
+ */
+extern void *i386_get_default_rm_buffer(uint16_t *size);
+
+/**
+ * This function allows calling interrupts in real mode and to set processor
+ * registers as desired before interrupt call is made and to retrieve the
+ * registers content after call was made.
+ *
+ * @param interruptNumber interrupt number to be called
+ * @param ir pointer to structure containing registers to be passed to interrupt
+ *        and to retrieve register content after call was made.
+ * @retval  0 call failed (GDT too small or pagin is on)
+ *          1 call successful
+ */
+extern int i386_real_interrupt_call(uint8_t interruptNumber, i386_realmode_interrupt_registers *ir);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* ASM */
+
+#endif /* _REALMODE_INT_H */