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Provide {get,set}_fbms() in basemem.h.

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set_fbms() will also update the E820 hidden region.
This commit is contained in:
Michael Brown
2007-01-13 23:57:31 +00:00
parent aaed3d50a8
commit 0b0e34e667
3 changed files with 68 additions and 210 deletions
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52
src/arch/i386/include/basemem.h
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@@ -1,33 +1,33 @@
#ifndef BASEMEM_H
#define BASEMEM_H
#ifndef _BASEMEM_H
#define _BASEMEM_H
#ifdef ASSEMBLY
/** @file
*
* Base memory allocation
*
*/
/* Must match sizeof(struct free_base_memory_header) */
#define FREE_BASEMEM_HEADER_SIZE 8
#include <stdint.h>
#include <realmode.h>
#include <bios.h>
#else /* ASSEMBLY */
/**
* Read the BIOS free base memory counter
*
* @ret fbms Free base memory counter (in kB)
*/
static inline unsigned int get_fbms ( void ) {
uint16_t fbms;
#include "stdint.h"
get_real ( fbms, BDA_SEG, BDA_FBMS );
return fbms;
}
/* Structures that we use to represent a free block of base memory */
extern void set_fbms ( unsigned int new_fbms );
#define FREE_BLOCK_MAGIC ( ('!'<<0) + ('F'<<8) + ('R'<<16) + ('E'<<24) )
struct free_base_memory_header {
uint32_t magic;
uint32_t size_kb;
};
/* Actually in hidemem.c, but putting it here avoids polluting the
* architecture-independent include/hidemem.h.
*/
extern void hide_basemem ( void );
union free_base_memory_block {
struct free_base_memory_header header;
char bytes[1024];
};
/* Function prototypes */
extern unsigned int get_free_base_memory ( void );
extern void * alloc_base_memory ( size_t size );
extern void free_base_memory ( void *ptr, size_t size );
#endif /* ASSEMBLY */
#endif /* BASEMEM_H */
#endif /* _BASEMEM_H */