--- /dev/null
+#ifndef LIBRM_H
+#define LIBRM_H
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/* Segment selectors as used in our protected-mode GDTs.
+ *
+ * Don't change these unless you really know what you're doing.
+ */
+
+#define VIRTUAL_CS 0x08
+#define VIRTUAL_DS 0x10
+#define PHYSICAL_CS 0x18
+#define PHYSICAL_DS 0x20
+#define REAL_CS 0x28
+#define REAL_DS 0x30
+#if 0
+#define LONG_CS 0x38
+#define LONG_DS 0x40
+#endif
+
+#ifndef ASSEMBLY
+
+#ifdef UACCESS_LIBRM
+#define UACCESS_PREFIX_librm
+#else
+#define UACCESS_PREFIX_librm __librm_
+#endif
+
+/* Variables in librm.S */
+extern unsigned long virt_offset;
+
+/**
+ * Convert physical address to user pointer
+ *
+ * @v phys_addr Physical address
+ * @ret userptr User pointer
+ */
+static inline __always_inline userptr_t
+UACCESS_INLINE ( librm, phys_to_user ) ( unsigned long phys_addr ) {
+ return ( phys_addr - virt_offset );
+}
+
+/**
+ * Convert user buffer to physical address
+ *
+ * @v userptr User pointer
+ * @v offset Offset from user pointer
+ * @ret phys_addr Physical address
+ */
+static inline __always_inline unsigned long
+UACCESS_INLINE ( librm, user_to_phys ) ( userptr_t userptr, off_t offset ) {
+ return ( userptr + offset + virt_offset );
+}
+
+static inline __always_inline userptr_t
+UACCESS_INLINE ( librm, virt_to_user ) ( volatile const void *addr ) {
+ return trivial_virt_to_user ( addr );
+}
+
+static inline __always_inline void *
+UACCESS_INLINE ( librm, user_to_virt ) ( userptr_t userptr, off_t offset ) {
+ return trivial_user_to_virt ( userptr, offset );
+}
+
+static inline __always_inline userptr_t
+UACCESS_INLINE ( librm, userptr_add ) ( userptr_t userptr, off_t offset ) {
+ return trivial_userptr_add ( userptr, offset );
+}
+
+static inline __always_inline off_t
+UACCESS_INLINE ( librm, userptr_sub ) ( userptr_t userptr,
+ userptr_t subtrahend ) {
+ return trivial_userptr_sub ( userptr, subtrahend );
+}
+
+static inline __always_inline void
+UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
+ userptr_t src, off_t src_off,
+ size_t len ) {
+ trivial_memcpy_user ( dest, dest_off, src, src_off, len );
+}
+
+static inline __always_inline void
+UACCESS_INLINE ( librm, memmove_user ) ( userptr_t dest, off_t dest_off,
+ userptr_t src, off_t src_off,
+ size_t len ) {
+ trivial_memmove_user ( dest, dest_off, src, src_off, len );
+}
+
+static inline __always_inline int
+UACCESS_INLINE ( librm, memcmp_user ) ( userptr_t first, off_t first_off,
+ userptr_t second, off_t second_off,
+ size_t len ) {
+ return trivial_memcmp_user ( first, first_off, second, second_off, len);
+}
+
+static inline __always_inline void
+UACCESS_INLINE ( librm, memset_user ) ( userptr_t buffer, off_t offset,
+ int c, size_t len ) {
+ trivial_memset_user ( buffer, offset, c, len );
+}
+
+static inline __always_inline size_t
+UACCESS_INLINE ( librm, strlen_user ) ( userptr_t buffer, off_t offset ) {
+ return trivial_strlen_user ( buffer, offset );
+}
+
+static inline __always_inline off_t
+UACCESS_INLINE ( librm, memchr_user ) ( userptr_t buffer, off_t offset,
+ int c, size_t len ) {
+ return trivial_memchr_user ( buffer, offset, c, len );
+}
+
+
+/******************************************************************************
+ *
+ * Access to variables in .data16 and .text16
+ *
+ */
+
+extern char *data16;
+extern char *text16;
+
+#define __data16( variable ) \
+ __attribute__ (( section ( ".data16" ) )) \
+ _data16_ ## variable __asm__ ( #variable )
+
+#define __data16_array( variable, array ) \
+ __attribute__ (( section ( ".data16" ) )) \
+ _data16_ ## variable array __asm__ ( #variable )
+
+#define __bss16( variable ) \
+ __attribute__ (( section ( ".bss16" ) )) \
+ _data16_ ## variable __asm__ ( #variable )
+
+#define __bss16_array( variable, array ) \
+ __attribute__ (( section ( ".bss16" ) )) \
+ _data16_ ## variable array __asm__ ( #variable )
+
+#define __text16( variable ) \
+ __attribute__ (( section ( ".text16.data" ) )) \
+ _text16_ ## variable __asm__ ( #variable )
+
+#define __text16_array( variable, array ) \
+ __attribute__ (( section ( ".text16.data" ) )) \
+ _text16_ ## variable array __asm__ ( #variable )
+
+#define __use_data16( variable ) \
+ ( * ( ( typeof ( _data16_ ## variable ) * ) \
+ & ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
+
+#define __use_text16( variable ) \
+ ( * ( ( typeof ( _text16_ ## variable ) * ) \
+ & ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
+
+#define __from_data16( pointer ) \
+ ( ( unsigned int ) \
+ ( ( ( void * ) (pointer) ) - ( ( void * ) data16 ) ) )
+
+#define __from_text16( pointer ) \
+ ( ( unsigned int ) \
+ ( ( ( void * ) (pointer) ) - ( ( void * ) text16 ) ) )
+
+/* Variables in librm.S, present in the normal data segment */
+extern uint16_t rm_sp;
+extern uint16_t rm_ss;
+extern uint16_t __text16 ( rm_cs );
+#define rm_cs __use_text16 ( rm_cs )
+extern uint16_t __text16 ( rm_ds );
+#define rm_ds __use_text16 ( rm_ds )
+
+/**
+ * Convert segment:offset address to user buffer
+ *
+ * @v segment Real-mode segment
+ * @v offset Real-mode offset
+ * @ret buffer User buffer
+ */
+static inline __always_inline userptr_t
+real_to_user ( unsigned int segment, unsigned int offset ) {
+ return ( phys_to_user ( ( segment << 4 ) + offset ) );
+}
+
+extern uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size );
+extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
+
+/* TEXT16_CODE: declare a fragment of code that resides in .text16 */
+#define TEXT16_CODE( asm_code_str ) \
+ ".section \".text16\", \"ax\", @progbits\n\t" \
+ ".code16\n\t" \
+ asm_code_str "\n\t" \
+ ".code32\n\t" \
+ ".previous\n\t"
+
+/* REAL_CODE: declare a fragment of code that executes in real mode */
+#define REAL_CODE( asm_code_str ) \
+ "pushl $1f\n\t" \
+ "call real_call\n\t" \
+ "addl $4, %%esp\n\t" \
+ TEXT16_CODE ( "\n1:\n\t" \
+ asm_code_str \
+ "\n\t" \
+ "ret\n\t" )
+
+/* PHYS_CODE: declare a fragment of code that executes in flat physical mode */
+#define PHYS_CODE( asm_code_str ) \
+ "call _virt_to_phys\n\t" \
+ asm_code_str \
+ "call _phys_to_virt\n\t"
+
+/** Number of interrupts */
+#define NUM_INT 256
+
+/** An interrupt descriptor table register */
+struct idtr {
+ /** Limit */
+ uint16_t limit;
+ /** Base */
+ uint32_t base;
+} __attribute__ (( packed ));
+
+/** An interrupt descriptor table entry */
+struct interrupt_descriptor {
+ /** Low 16 bits of address */
+ uint16_t low;
+ /** Code segment */
+ uint16_t segment;
+ /** Unused */
+ uint8_t unused;
+ /** Type and attributes */
+ uint8_t attr;
+ /** High 16 bits of address */
+ uint16_t high;
+} __attribute__ (( packed ));
+
+/** Interrupt descriptor is present */
+#define IDTE_PRESENT 0x80
+
+/** Interrupt descriptor 32-bit interrupt gate type */
+#define IDTE_TYPE_IRQ32 0x0e
+
+/** An interrupt vector
+ *
+ * Each interrupt vector comprises an eight-byte fragment of code:
+ *
+ * 60 pushal
+ * b0 xx movb $INT, %al
+ * e9 xx xx xx xx jmp interrupt_wrapper
+ */
+struct interrupt_vector {
+ /** "pushal" instruction */
+ uint8_t pushal;
+ /** "movb" instruction */
+ uint8_t movb;
+ /** Interrupt number */
+ uint8_t intr;
+ /** "jmp" instruction */
+ uint8_t jmp;
+ /** Interrupt wrapper address offset */
+ uint32_t offset;
+ /** Next instruction after jump */
+ uint8_t next[0];
+} __attribute__ (( packed ));
+
+/** "pushal" instruction */
+#define PUSHAL_INSN 0x60
+
+/** "movb" instruction */
+#define MOVB_INSN 0xb0
+
+/** "jmp" instruction */
+#define JMP_INSN 0xe9
+
+extern void set_interrupt_vector ( unsigned int intr, void *vector );
+
+#endif /* ASSEMBLY */
+
+#endif /* LIBRM_H */
Code Review / kvmfornfv.git / blobdiff