sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2025-12-31 15:25:23 +03:00
Code Issues Packages Projects Releases Wiki Activity

[uaccess] Formalise the uaccess API

Browse Source 
The userptr_t is now the fundamental type that gets used for conversions.
For example, virt_to_phys() is implemented in terms of virt_to_user() and
user_to_phys().
This commit is contained in:
Michael Brown
2008-10-13 03:47:33 +01:00
parent 667819becc
commit 6554b79ff9
21 changed files with 569 additions and 760 deletions
Download Patch File Download Diff File Expand all files Collapse all files

93
src/arch/i386/include/realmode.h
View File

@@ -1,45 +1,15 @@
#ifndef REALMODE_H
#define REALMODE_H
#ifndef ASSEMBLY
#include "stdint.h"
#include "registers.h"
#include <gpxe/io.h>
#include <stdint.h>
#include <registers.h>
#include <gpxe/uaccess.h>
/*
* Data structures and type definitions
*
*/
/* Segment:offset structure. Note that the order within the structure
* is offset:segment.
*/
struct segoff {
uint16_t offset;
uint16_t segment;
} __attribute__ (( packed ));
typedef struct segoff segoff_t;
/* Macro hackery needed to stringify bits of inline assembly */
#define RM_XSTR(x) #x
#define RM_STR(x) RM_XSTR(x)
/* Drag in the selected real-mode transition library header */
#ifdef KEEP_IT_REAL
#include "libkir.h"
#else
#include "librm.h"
#endif
/*
* The API to some functions is identical between librm and libkir, so
* they are documented here, even though the prototypes are in librm.h
* and libkir.h.
*
*/
/*
* Declaration of variables in .data16
*
@@ -92,24 +62,53 @@ typedef struct segoff segoff_t;
* assembler output to make sure that it's doing the right thing.
*/
/*
* void copy_to_real ( uint16_t dest_seg, uint16_t dest_off,
* void *src, size_t n )
* void copy_from_real ( void *dest, uint16_t src_seg, uint16_t src_off,
* size_t n )
/**
* Copy data to base memory
*
* These functions can be used to copy data to and from arbitrary
* locations in base memory.
* @v dest_seg Destination segment
* @v dest_off Destination offset
* @v src Source
* @v len Length
*/
static inline __always_inline void
copy_to_real ( unsigned int dest_seg, unsigned int dest_off,
void *src, size_t n ) {
copy_to_user ( real_to_user ( dest_seg, dest_off ), 0, src, n );
}
/*
* put_real ( variable, uint16_t dest_seg, uint16_t dest_off )
* get_real ( variable, uint16_t src_seg, uint16_t src_off )
/**
* Copy data to base memory
*
* These macros can be used to read or write single variables to and
* from arbitrary locations in base memory. "variable" must be a
* variable of either 1, 2 or 4 bytes in length.
* @v dest Destination
* @v src_seg Source segment
* @v src_off Source offset
* @v len Length
*/
static inline __always_inline void
copy_from_real ( void *dest, unsigned int src_seg,
unsigned int src_off, size_t n ) {
copy_from_user ( dest, real_to_user ( src_seg, src_off ), 0, n );
}
/**
* Write a single variable to base memory
*
* @v var Variable to write
* @v dest_seg Destination segment
* @v dest_off Destination offset
*/
#define put_real( var, dest_seg, dest_off ) \
copy_to_real ( (dest_seg), (dest_off), &(var), sizeof (var) )
/**
* Read a single variable from base memory
*
* @v var Variable to read
* @v src_seg Source segment
* @v src_off Source offset
*/
#define get_real( var, src_seg, src_off ) \
copy_from_real ( &(var), (src_seg), (src_off), sizeof (var) )
/*
* REAL_CODE ( asm_code_str )
@@ -123,6 +122,4 @@ typedef struct segoff segoff_t;
*
*/
#endif /* ASSEMBLY */
#endif /* REALMODE_H */