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Made copy_{to,from}_real volatile, so that they don't get optimised away.

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Added REAL_FRAGMENT(), because it could conceivably be useful.
This commit is contained in:
Michael Brown 2005-04-17 12:17:06 +00:00
parent 8e27e50316
commit 1a6ca649a2
1 changed files with 49 additions and 18 deletions
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67
src/arch/i386/include/libkir.h
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@ -14,29 +14,31 @@
static inline void copy_to_real_libkir ( uint16_t dest_seg, uint16_t dest_off,
void *src, size_t n ) {
__asm__ ( "movw %4, %%es\n\t"
"cld\n\t"
"rep movsb\n\t"
"pushw %%ds\n\t" /* restore %es */
"popw %%es\n\t"
: "=S" ( src ), "=D" ( dest_off ), "=c" ( n ) /* clobbered */
: "S" ( src ), "r" ( dest_seg ), "D" ( dest_off ), "c" ( n )
: "memory"
);
__asm__ __volatile__ ( "movw %4, %%es\n\t"
"cld\n\t"
"rep movsb\n\t"
"pushw %%ds\n\t" /* restore %es */
"popw %%es\n\t"
: "=S" ( src ), "=D" ( dest_off ),
"=c" ( n ) /* clobbered */
: "S" ( src ), "r" ( dest_seg ),
"D" ( dest_off ), "c" ( n )
: "memory" );
}
static inline void copy_from_real_libkir ( void *dest,
uint16_t src_seg, uint16_t src_off,
size_t n ) {
__asm__ ( "movw %%ax, %%ds\n\t"
"cld\n\t"
"rep movsb\n\t"
"pushw %%es\n\t" /* restore %ds */
"popw %%ds\n\t"
: "=S" ( src_off ), "=D" ( dest ), "=c" ( n ) /* clobbered */
: "a" ( src_seg ), "S" ( src_off ), "D" ( dest ), "c" ( n )
: "memory"
);
__asm__ __volatile__ ( "movw %%ax, %%ds\n\t"
"cld\n\t"
"rep movsb\n\t"
"pushw %%es\n\t" /* restore %ds */
"popw %%ds\n\t"
: "=S" ( src_off ), "=D" ( dest ),
"=c" ( n ) /* clobbered */
: "a" ( src_seg ), "S" ( src_off ),
"D" ( dest ), "c" ( n )
: "memory" );
}
#define copy_to_real copy_to_real_libkir
#define copy_from_real copy_from_real_libkir
@ -122,6 +124,35 @@ static inline void copy_from_real_libkir ( void *dest,
#define BASEMEM_PARAMETER_INIT BASEMEM_PARAMETER_INIT_LIBKIR
#define BASEMEM_PARAMETER_DONE BASEMEM_PARAMETER_DONE_LIBKIR
/* REAL_FRAGMENT: Declare and define a real-mode code fragment in
* .text16. We don't need this for REAL_EXEC, since we can just
* execute our real-mode code inline, but it's handy in case someone
* genuinely wants to create a block of code that can be copied to a
* specific location and then executed.
*
* Note that we put the code in the data segment, since otherwise we
* can't (easily) access it in order to copy it to its target
* location. We should never be calling any REAL_FRAGMENT routines
* directly anyway.
*/
#define REAL_FRAGMENT( name, asm_code_str ) \
extern void name ( void ); \
extern char name ## _size[]; \
__asm__ __volatile__ ( \
".section \".data.text16\"\n\t" \
".code16\n\t" \
".arch i386\n\t" \
#name ":\n\t" \
asm_code_str "\n\t" \
"lret\n\t" \
#name "_end:\n\t" \
".equ " #name "_size, " #name "_end - " #name "\n\t" \
".code16gcc\n\t" \
".previous\n\t" \
: : \
)
#define FRAGMENT_SIZE( fragment ) ( (size_t) fragment ## _size )
/* REAL_CALL: call an external real-mode routine */
#define OUT_CONSTRAINTS(...) __VA_ARGS__
#define IN_CONSTRAINTS(...) "m" ( __routine ), ## __VA_ARGS__