1 files changed, 114 insertions, 0 deletions
diff --git a/os/boot/pc/mem.h b/os/boot/pc/mem.h
new file mode 100644
index 00000000..d33fee0e
--- /dev/null
+++ b/os/boot/pc/mem.h
@@ -0,0 +1,114 @@
+/*
+ * Memory and machine-specific definitions.  Used in C and assembler.
+ */
+
+/*
+ * Sizes
+ */
+#define	BI2BY		8			/* bits per byte */
+#define	BI2WD		32			/* bits per word */
+#define	BY2WD		4			/* bytes per word */
+#define	BY2PG		4096			/* bytes per page */
+#define	WD2PG		(BY2PG/BY2WD)		/* words per page */
+#define	PGSHIFT		12			/* log(BY2PG) */
+#define	PGROUND(s)	(((s)+(BY2PG-1))&~(BY2PG-1))
+
+#define	MAXMACH		1			/* max # cpus system can run */
+
+/*
+ * Time
+ */
+#define	HZ		(100)				/* clock frequency */
+#define	MS2HZ		(1000/HZ)			/* millisec per clock tick */
+#define	TK2SEC(t)	((t)/HZ)			/* ticks to seconds */
+#define	TK2MS(x)	((x)*(1000/HZ))
+#define	MS2TK(t)	((((ulong)(t))*HZ)/1000)	/* milliseconds to ticks */
+
+/*
+ * Fundamental addresses
+ */
+#define IDTADDR		0x80000800		/* idt */
+#define APBOOTSTRAP	0x80001000		/* AP bootstrap code */
+#define CONFADDR	0x80001200		/* info passed from boot loader */
+#define CPU0PDB		0x80002000		/* bootstrap processor PDB */
+#define CPU0PTE		0x80003000		/* bootstrap processor PTE's for 0-4MB */
+#define MACHADDR	0x80004000		/* as seen by current processor */
+#define CPU0MACH	0x80005000		/* Mach for bootstrap processor */
+#define	MACHSIZE	(BY2PG*8)	/* stack size */
+
+
+/*
+ *  Address spaces
+ *
+ *  Kernel is at 2GB-4GB
+ */
+#define	KZERO		0x80000000		/* base of kernel address space */
+#define	KTZERO		KZERO			/* first address in kernel text */
+#define ROMBIOS		(KZERO|0xF0000)
+
+/*
+ *  known 80386 segments (in GDT) and their selectors
+ */
+#define	NULLSEG	0	/* null segment */
+#define	KDSEG	1	/* kernel data/stack */
+#define	KESEG	2	/* kernel executable */	
+#define	UDSEG	3	/* user data/stack */
+#define	UESEG	4	/* user executable */
+#define	SYSGATE	5	/* system call gate */
+#define TSSSEG	6	/* task segment */
+
+#define SELGDT	(0<<3)	/* selector is in gdt */
+#define	SELLDT	(1<<3)	/* selector is in ldt */
+
+#define SELECTOR(i, t, p)	(((i)<<3) | (t) | (p))
+
+#define NULLSEL	SELECTOR(NULLSEG, SELGDT, 0)
+#define KESEL	SELECTOR(KESEG, SELGDT, 0)
+#define KDSEL	SELECTOR(KDSEG, SELGDT, 0)
+#define UESEL	SELECTOR(UESEG, SELGDT, 3)
+#define UDSEL	SELECTOR(UDSEG, SELGDT, 3)
+#define TSSSEL	SELECTOR(TSSSEG, SELGDT, 0)
+
+/*
+ *  fields in segment descriptors
+ */
+#define SEGDATA	(0x10<<8)	/* data/stack segment */
+#define SEGEXEC	(0x18<<8)	/* executable segment */
+#define	SEGTSS	(0x9<<8)	/* TSS segment */
+#define SEGCG	(0x0C<<8)	/* call gate */
+#define	SEGIG	(0x0E<<8)	/* interrupt gate */
+#define SEGTG	(0x0F<<8)	/* task gate */
+#define SEGTYPE	(0x1F<<8)
+
+#define SEGP	(1<<15)		/* segment present */
+#define SEGPL(x) ((x)<<13)	/* priority level */
+#define SEGB	(1<<22)		/* granularity 1==4k (for expand-down) */
+#define SEGG	(1<<23)		/* granularity 1==4k (for other) */
+#define SEGE	(1<<10)		/* expand down */
+#define SEGW	(1<<9)		/* writable (for data/stack) */
+#define	SEGR	(1<<9)		/* readable (for code) */
+#define SEGD	(1<<22)		/* default 1==32bit (for code) */
+
+/*
+ *  virtual MMU
+ */
+#define PTEMAPMEM	(1024*1024)	/* ??? */	
+#define SEGMAPSIZE	16		/* ??? */
+#define	PTEPERTAB	(PTEMAPMEM/BY2PG)	/* ??? */
+#define PPN(x)		((x)&~(BY2PG-1))
+
+/*
+ *  physical MMU
+ */
+#define	PTEVALID	(1<<0)
+#define	PTEUNCACHED	0		/* everything is uncached */
+#define	PTEWRITE	(1<<1)
+#define	PTERONLY	(0<<1)
+#define	PTEKERNEL	(0<<2)
+#define	PTEUSER		(1<<2)
+#define	PTESIZE		(1<<7)
+
+/*
+ *  flag register bits that we care about
+ */
+#define IFLAG	0x200