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#include "mem.h"
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/*
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 * Macro for calculating offset within the page directory base.
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 * Note that this is assembler-specific hence the '<<2'.
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 */
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#define PDO(a)		(((((a))>>22) & 0x03FF)<<2)
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TEXT _warp64(SB), $0
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	CLI
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	MOVL	entry+0(FP), BP			/* entry */
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	MOVL	CR3, CX				/* load address of PDB */
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	ADDL	$KZERO, CX
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	MOVL	PDO(KZERO)(CX), DX		/* double-map KZERO at 0 */
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	MOVL	DX, PDO(0)(CX)
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	MOVL	CR3, CX
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	MOVL	CX, CR3				/* load and flush the mmu */
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	MOVL	$_start32id<>-KZERO(SB), AX
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	JMP*	AX				/* jump to identity-map */
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TEXT _start32id<>(SB), $0
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	MOVL	CR0, DX				/* turn off paging */
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	ANDL	$~PG, DX
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	MOVL	$_stop32pg<>-KZERO(SB), AX
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	MOVL	DX, CR0
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	JMP*	AX				/* forward into the past */
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TEXT _stop32pg<>(SB), $0
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	MOVL multibootheader-KZERO(SB), BX
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	MOVL $0x2badb002, AX
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	JMP* BP