897313007b
usual __{text,data}16 trick work with arrays. gcc seems to accept the
__asm__ ( asmlabel ) only after the [] of the array declaration, not
before.
230 lines
6.9 KiB
C
230 lines
6.9 KiB
C
#ifndef LIBRM_H
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#define LIBRM_H
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/* Drag in protected-mode segment selector values */
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#include "virtaddr.h"
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#include "realmode.h"
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#ifndef ASSEMBLY
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#include "stddef.h"
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#include "string.h"
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/*
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* Data structures and type definitions
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*
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*/
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/* Access to variables in .data16 and .text16 */
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extern char *data16;
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extern char *text16;
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#define __data16( variable ) \
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__attribute__ (( section ( ".data16" ) )) \
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_data16_ ## variable __asm__ ( #variable )
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#define __data16_array( variable, array ) \
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__attribute__ (( section ( ".data16" ) )) \
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_data16_ ## variable array __asm__ ( #variable )
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#define __text16( variable ) \
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__attribute__ (( section ( ".text16.data" ) )) \
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_text16_ ## variable __asm__ ( #variable )
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#define __text16_array( variable, array ) \
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__attribute__ (( section ( ".text16.data" ) )) \
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_text16_ ## variable array __asm__ ( #variable )
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#define __use_data16( variable ) \
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( * ( ( typeof ( _data16_ ## variable ) * ) \
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& ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
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#define __use_text16( variable ) \
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( * ( ( typeof ( _text16_ ## variable ) * ) \
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& ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
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#define __from_data16( variable ) \
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( * ( ( typeof ( variable ) * ) \
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( ( ( void * ) &(variable) ) - ( ( void * ) data16 ) ) ) )
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#define __from_text16( variable ) \
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( * ( ( typeof ( variable ) * ) \
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( ( ( void * ) &(variable) ) - ( ( void * ) text16 ) ) ) )
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/* Variables in librm.S, present in the normal data segment */
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extern uint16_t rm_sp;
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extern uint16_t rm_ss;
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extern uint32_t pm_esp;
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extern uint16_t __data16 ( rm_cs );
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#define rm_cs __use_data16 ( rm_cs )
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extern uint16_t __text16 ( rm_ds );
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#define rm_ds __use_text16 ( rm_ds )
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/* Functions that librm expects to be able to link to. Included here
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* so that the compiler will catch prototype mismatches.
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*/
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extern void gateA20_set ( void );
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/*
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* librm_mgmt: functions for manipulating base memory and executing
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* real-mode code.
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*
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* Full API documentation for these functions is in realmode.h.
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*
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*/
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/* Macro for obtaining a physical address from a segment:offset pair. */
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#define VIRTUAL(x,y) ( phys_to_virt ( ( ( x ) << 4 ) + ( y ) ) )
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/* Copy to/from base memory */
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static inline __attribute__ (( always_inline )) void
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copy_to_real_librm ( unsigned int dest_seg, unsigned int dest_off,
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void *src, size_t n ) {
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memcpy ( VIRTUAL ( dest_seg, dest_off ), src, n );
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}
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static inline __attribute__ (( always_inline )) void
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copy_from_real_librm ( void *dest, unsigned int src_seg,
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unsigned int src_off, size_t n ) {
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memcpy ( dest, VIRTUAL ( src_seg, src_off ), n );
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}
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#define put_real_librm( var, dest_seg, dest_off ) \
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do { \
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* ( ( typeof(var) * ) VIRTUAL ( dest_seg, dest_off ) ) = var; \
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} while ( 0 )
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#define get_real_librm( var, src_seg, src_off ) \
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do { \
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var = * ( ( typeof(var) * ) VIRTUAL ( src_seg, src_off ) ); \
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} while ( 0 )
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#define copy_to_real copy_to_real_librm
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#define copy_from_real copy_from_real_librm
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#define put_real put_real_librm
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#define get_real get_real_librm
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/**
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* A pointer to a user buffer
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*
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* Even though we could just use a void *, we use an intptr_t so that
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* attempts to use normal pointers show up as compiler warnings. Such
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* code is actually valid for librm, but not for libkir (i.e. under
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* KEEP_IT_REAL), so it's good to have the warnings even under librm.
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*/
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typedef intptr_t userptr_t;
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/**
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* Copy data to user buffer
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*
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* @v buffer User buffer
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* @v offset Offset within user buffer
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* @v src Source
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* @v len Length
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*/
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static inline __attribute__ (( always_inline )) void
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copy_to_user ( userptr_t buffer, off_t offset, const void *src, size_t len ) {
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memcpy ( ( void * ) buffer + offset, src, len );
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}
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/**
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* Copy data from user buffer
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*
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* @v dest Destination
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* @v buffer User buffer
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* @v offset Offset within user buffer
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* @v len Length
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*/
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static inline __attribute__ (( always_inline )) void
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copy_from_user ( void *dest, userptr_t buffer, off_t offset, size_t len ) {
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memcpy ( dest, ( void * ) buffer + offset, len );
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}
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/**
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* Convert virtual address to user buffer
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*
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* @v virtual Virtual address
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* @ret buffer User buffer
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*
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* This constructs a user buffer from an ordinary pointer. Use it
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* when you need to pass a pointer to an internal buffer to a function
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* that expects a @c userptr_t.
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*/
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static inline __attribute__ (( always_inline )) userptr_t
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virt_to_user ( void * virtual ) {
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return ( ( intptr_t ) virtual );
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}
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/**
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* Convert segment:offset address to user buffer
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*
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* @v segment Real-mode segment
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* @v offset Real-mode offset
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* @ret buffer User buffer
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*/
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static inline __attribute__ (( always_inline )) userptr_t
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real_to_user ( unsigned int segment, unsigned int offset ) {
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return virt_to_user ( VIRTUAL ( segment, offset ) );
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}
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/* Copy to/from real-mode stack */
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extern uint16_t copy_to_rm_stack ( void *data, size_t size );
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extern void remove_from_rm_stack ( void *data, size_t size );
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/* Place/remove parameter on real-mode stack in a way that's
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* compatible with libkir
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*/
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#define BASEMEM_PARAMETER_INIT_LIBRM( param ) \
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copy_to_rm_stack ( & ( param ), sizeof ( param ) )
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#define BASEMEM_PARAMETER_DONE_LIBRM( param ) \
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remove_from_rm_stack ( & ( param ), sizeof ( param ) )
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#define BASEMEM_PARAMETER_INIT BASEMEM_PARAMETER_INIT_LIBRM
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#define BASEMEM_PARAMETER_DONE BASEMEM_PARAMETER_DONE_LIBRM
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/* REAL_FRAGMENT: Declare and define a real-mode code fragment in .text16 */
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#define REAL_FRAGMENT( name, asm_code_str ) \
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extern void name ( void ); \
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__asm__ __volatile__ ( \
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".section \".text16\", \"ax\", @progbits\n\t" \
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".code16\n\t" \
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".arch i386\n\t" \
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#name ":\n\t" \
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asm_code_str "\n\t" \
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"ret\n\t" \
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".size " #name ", . - " #name "\n\t" \
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".code32\n\t" \
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".previous\n\t" \
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: : \
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)
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#define FRAGMENT_SIZE( fragment ) ( (size_t) fragment ## _size )
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/* REAL_CALL: call a real-mode routine via librm */
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#define OUT_CONSTRAINTS(...) __VA_ARGS__
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#define IN_CONSTRAINTS(...) __VA_ARGS__
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#define CLOBBER(...) __VA_ARGS__
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#define REAL_CALL( routine, num_out_constraints, out_constraints, \
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in_constraints, clobber ) \
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do { \
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__asm__ __volatile__ ( \
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"pushl $" #routine "\n\t" \
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"call real_call\n\t" \
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"addl $4, %%esp\n\t" \
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: out_constraints \
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: in_constraints \
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: clobber \
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); \
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} while ( 0 )
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/* REAL_EXEC: combine RM_FRAGMENT and REAL_CALL into one handy unit */
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#define PASSTHRU(...) __VA_ARGS__
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#define REAL_EXEC( name, asm_code_str, num_out_constraints, out_constraints, \
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in_constraints, clobber ) \
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do { \
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REAL_FRAGMENT ( name, asm_code_str ); \
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\
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REAL_CALL ( name, num_out_constraints, \
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PASSTHRU ( out_constraints ), \
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PASSTHRU ( in_constraints ), \
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PASSTHRU ( clobber ) ); \
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} while ( 0 )
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#endif /* ASSEMBLY */
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#endif /* LIBRM_H */
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