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This commit is contained in:
Michael Brown
2005-03-08 18:53:11 +00:00
commit 3d6123e69a
373 changed files with 114041 additions and 0 deletions
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124
src/arch/i386/include/realmode.h Normal file
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/* Real-mode interface
*/
#ifndef ASSEMBLY
#include "etherboot.h"
#include "segoff.h"
typedef union {
struct {
union {
uint8_t l;
uint8_t byte;
};
uint8_t h;
} PACKED;
uint16_t word;
} PACKED reg16_t;
typedef union {
reg16_t w;
uint32_t dword;
} PACKED reg32_t;
/* Macros to help with defining inline real-mode trampoline fragments.
*/
#define RM_XSTR(x) #x /* Macro hackery needed to stringify */
#define RM_STR(x) RM_XSTR(x)
#define RM_FRAGMENT(name, asm_code_str) \
extern void name ( void ); \
extern void name ## _end (void); \
__asm__( \
".section \".text16\"\n\t" \
".code16\n\t" \
".arch i386\n\t" \
".globl " #name " \n\t" \
#name ":\n\t" \
asm_code_str "\n\t" \
".globl " #name "_end\n\t" \
#name "_end:\n\t" \
".code32\n\t" \
".previous\n\t" \
)
#define FRAGMENT_SIZE(fragment) ( (size_t) ( ( (void*) fragment ## _end )\
- ( (void*) (fragment) ) ) )
/* Data structures in _prot_to_real and _real_to_prot. These
* structures are accessed by assembly code as well as C code.
*/
typedef struct {
uint32_t esp;
uint16_t cs;
uint16_t ss;
uint32_t r2p_params;
} PACKED prot_to_real_params_t;
typedef struct {
uint32_t ret_addr;
uint32_t esp;
uint32_t ebx;
uint32_t esi;
uint32_t edi;
uint32_t ebp;
uint32_t out_stack;
uint32_t out_stack_len;
} PACKED real_to_prot_params_t;
/* Function prototypes: realmode.c
*/
#define real_call( fragment, in_stack, out_stack ) \
_real_call ( fragment, FRAGMENT_SIZE(fragment), \
(void*)(in_stack), \
( (in_stack) == NULL ? 0 : sizeof(*(in_stack)) ), \
(void*)(out_stack), \
( (out_stack) == NULL ? 0 : sizeof(*(out_stack)) ) )
extern uint16_t _real_call ( void *fragment, int fragment_len,
void *in_stack, int in_stack_len,
void *out_stack, int out_stack_len );
/* Function prototypes: realmode_asm.S
*/
extern void rm_callback_interface;
extern uint16_t rm_callback_interface_size;
extern uint32_t rm_etherboot_location;
extern void _rm_in_call ( void );
extern void _rm_in_call_far ( void );
extern void _prot_to_real_prefix ( void );
extern void _prot_to_real_prefix_end ( void );
extern uint16_t prot_to_real_prefix_size;
extern void _real_to_prot_suffix ( void );
extern void _real_to_prot_suffix_end ( void );
extern uint16_t real_to_prot_suffix_size;
/* PXE assembler bits */
extern void pxe_callback_interface;
extern uint16_t pxe_callback_interface_size;
extern void _pxe_in_call_far ( void );
extern void _pxenv_in_call_far ( void );
extern void _pxe_intercept_int1a ( void );
extern segoff_t _pxe_intercepted_int1a;
extern segoff_t _pxe_pxenv_location;
/* Global variables
*/
extern uint32_t real_mode_stack;
extern size_t real_mode_stack_size;
extern int lock_real_mode_stack;
/* Function prototypes from basemem.c
*/
#ifdef LINUXBIOS
/* A silly hard code that let's the code compile and work.
* When this becomes a problem feel free to implement
* something better.
*/
static inline void allot_real_mode_stack(void) { real_mode_stack = 0x7c00; }
#else
void allot_real_mode_stack(void);
#endif
#endif /* ASSEMBLY */