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