Has been obsolete for a while.

src/arch/i386/core/setup.S

@@ -1,160 +0,0 @@
-/****************************************************************************
- * This file provides the setup() and setup16() functions.  The
- * purpose of these functions is to set up the internal environment so
- * that C code can execute.  This includes setting up the internal
- * stack and (where applicable) setting up a GDT for virtual
- * addressing.
- *
- * These functions are designed to be called by the prefix.
- *
- * The same basic assembly code is used to compile both setup()
- * and setup16().
- ****************************************************************************
- */
-
-	.text
-	.arch i386
-
-#ifdef CODE16
-/****************************************************************************
- * setup16 (real-mode far call)
- *
- * This function can be called by a 16-bit prefix in order to set up
- * the internal (either 16-bit or 32-bit) environment.
- *
- * Parameters: none
- *
- * %cs:0000, %ds:0000 and %es:0000 must point to the start of the
- * (decompressed) runtime image.
- *
- * If KEEP_IT_REAL is defined, then %ds:0000 may instead point to the
- * start of the (decompressed) data segment portion of the runtime
- * image.  If %ds==%cs, then it will be assumed that the data segment
- * follows immediately after the code segment.
- ****************************************************************************
- */
-
-#ifdef KEEP_IT_REAL
-
-#define ENTER_FROM_EXTERNAL call ext_to_kir
-#define RETURN_TO_EXTERNAL call kir_to_ext
-#define ENTRY_POINT kir_call
-#define ENTRY_POINT_REGISTER di	 
-#define INIT_FUNC initialise
-
-#else /* KEEP_IT_REAL */
-
-#define ENTER_FROM_EXTERNAL \
-	pushw %cs ; \
-	call real_to_prot ; \
-	.code32
-#define RETURN_TO_EXTERNAL \
-	call prot_to_real ; \
-	.code16
-#define ENTRY_POINT _prot_call /* _prot_call = OFFSET ( prot_call ) in librm */
-#define ENTRY_POINT_REGISTER di	 
-#define INIT_FUNC initialise_via_librm
-
-#endif /* KEEP_IT_REAL */
-	
-	.section ".text16"
-	.code16
-	.globl setup16
-setup16:
-	
-#else /* CODE16 */
-
-/****************************************************************************
- * setup (32-bit protected-mode near call)
- *
- * This function can be called by a 32-bit prefix in order to set up
- * the internal 32-bit environment.
- *
- * Parameters: none
- ****************************************************************************
- */
-
-#define ENTER_FROM_EXTERNAL call ext_to_int
-#define RETURN_TO_EXTERNAL call int_to_ext
-#define ENTRY_POINT int_call
-#define ENTRY_POINT_REGISTER edi
-#define INIT_FUNC initialise
-		
-	.section ".text"
-	.code32
-	.globl setup
-setup:
-	
-#endif /* CODE16 */
-	
-	/* Preserve flags (including interrupt status) and registers */
-	pushfl
-	pushl	%ebp
-
-	/* Switch to (uninitialised) internal environment.  This will
-	 * preserve the external environment for when we call
-	 * RETURN_TO_EXTERNAL.
-	 */
-	ENTER_FROM_EXTERNAL
-	/* NOTE: We may have only four bytes of stack at this point */
-
-#if defined(CODE16) && defined(KEEP_IT_REAL)
-	
-	/* If %ds == %cs, then the data segment is located immediately
-	 * after the code segment.
-	 */
-	pushw	%ax
-	movw	%cs, %ax
-	movw	%ds, %bp
-	cmpw	%ax, %bp
-	jne	1f
-	addw	$_text_load_size_pgh, %ax
-	movw	%ax, %ds
-1:	popw	%ax
-		
-	/* Switch to internal stack */
-	pushw	%ds
-	popw	%ss
-	movl	$_estack, %esp
-
-#else /* CODE16 && KEEP_IT_REAL */
-
-	/* Work out where we're running and switch to internal pmode
-	 * stack
-	 */
-	call	1f
-1:	popl	%ebp
-	leal	(_estack-1b)(%ebp), %esp
-
-	/* Set up GDT for virtual addressing */
-	call	run_here
-
-#endif /* CODE16 && KEEP_IT_REAL */
-	
-	/* Switch back to external environment.  This will preserve
-	 * the internal environment ready for the next call.
-	 */
-	RETURN_TO_EXTERNAL
-
-	/* Set %es:[e]di to point to entry-point function.
-	 */
-	push	%cs
-	pop	%es
-	mov	$ENTRY_POINT, %ENTRY_POINT_REGISTER
-
-	/* Far call to initialise via the entry-point function.
-	 * initialise() (or the entry-point function itself) may
-	 * update %es:[e]di to point to a new entry-point function for
-	 * subsequent calls.  librm will use this facility, since
-	 * initialise() causes librm to be relocated.
-	 */
-	pushl	$INIT_FUNC
-	push	%cs		/* lcall %es:[x]di == %cs:[x]di */
-	call	*%ENTRY_POINT_REGISTER
-	popl	%ebp /* discard */
-	
-	/* Restore flags (including interrupt status) and return */
-	popl	%ebp
-	popfl
-	lret
-